From bd51b0076f0e4d8fd039898c2ca8ac7a23e1b6e2 Mon Sep 17 00:00:00 2001
From: Kevin Gibbons <bakkot@gmail.com>
Date: Tue, 16 Apr 2024 19:46:34 -0700
Subject: [PATCH 1/9] add types for iterator helpers proposal

---
 src/compiler/commandLineParser.ts      |   1 +
 src/lib/esnext.d.ts                    |   1 +
 src/lib/esnext.iterator.d.ts           | 134 +++++++++++++++++++++++++
 src/lib/libs.json                      |   1 +
 tests/cases/compiler/nativeIterator.ts |  30 ++++++
 5 files changed, 167 insertions(+)
 create mode 100644 src/lib/esnext.iterator.d.ts
 create mode 100644 tests/cases/compiler/nativeIterator.ts

diff --git a/src/compiler/commandLineParser.ts b/src/compiler/commandLineParser.ts
index b790ed08fbe08..9d3d21b09b746 100644
--- a/src/compiler/commandLineParser.ts
+++ b/src/compiler/commandLineParser.ts
@@ -236,6 +236,7 @@ const libEntries: [string, string][] = [
     ["esnext.object", "lib.esnext.object.d.ts"],
     ["esnext.array", "lib.esnext.array.d.ts"],
     ["esnext.regexp", "lib.esnext.regexp.d.ts"],
+    ["esnext.iterator", "lib.esnext.iterator.d.ts"],
     ["decorators", "lib.decorators.d.ts"],
     ["decorators.legacy", "lib.decorators.legacy.d.ts"],
 ];
diff --git a/src/lib/esnext.d.ts b/src/lib/esnext.d.ts
index 9e601b60a27c2..7897c58cef67c 100644
--- a/src/lib/esnext.d.ts
+++ b/src/lib/esnext.d.ts
@@ -7,3 +7,4 @@
 /// <reference lib="esnext.collection" />
 /// <reference lib="esnext.array" />
 /// <reference lib="esnext.regexp" />
+/// <reference lib="esnext.iterator" />
diff --git a/src/lib/esnext.iterator.d.ts b/src/lib/esnext.iterator.d.ts
new file mode 100644
index 0000000000000..01b74a6be0400
--- /dev/null
+++ b/src/lib/esnext.iterator.d.ts
@@ -0,0 +1,134 @@
+interface NativeIterator<T, TReturn = void, TNext = undefined> extends Iterator<T, TReturn, TNext> {
+    /**
+     * Returns this iterator.
+     */
+    [Symbol.iterator](): NativeIterator<T, TReturn, TNext>;
+
+    /**
+     * Creates an iterator whose values are the result of applying the callback to the values from this iterator.
+     * @param callbackfn A function that accepts up to two arguments to be used to transform values from the underlying iterator.
+     */
+    map<U>(callbackfn: (value: T, index: number) => U): NativeIterator<U>;
+
+    /**
+     * Creates an iterator whose values are those from this iterator for which the provided predicate returns true.
+     * @param predicate A function that accepts up to two arguments to be used to test values from the underlying iterator.
+     */
+    filter<S extends T>(predicate: (value: T, index: number) => value is S): NativeIterator<S>;
+
+    /**
+     * Creates an iterator whose values are those from this iterator for which the provided predicate returns true.
+     * @param predicate A function that accepts up to two arguments to be used to test values from the underlying iterator.
+     */
+    filter(predicate: (value: T, index: number) => unknown): NativeIterator<T>;
+
+    /**
+     * Creates an iterator whose values are the values from this iterator, stopping once the provided limit is reached.
+     * @param limit The maximum number of values to yield.
+     */
+    take(limit: number): NativeIterator<T>;
+
+    /**
+     * Creates an iterator whose values are the values from this iterator after skipping the provided count.
+     * @param count The number of values to drop.
+     */
+    drop(count: number): NativeIterator<T>;
+
+    /**
+     * Creates an iterator whose values are the result of applying the callback to the values from this iterator and then flattening the resulting iterators or iterables.
+     * @param callback A function that accepts up to two arguments to be used to transform values from the underlying iterator into new iterators or iterables to be flattened into the result.
+     */
+    flatMap<U>(callback: (value: T, index: number) => (Iterator<U> | Iterable<U>)): NativeIterator<U>;
+
+    /**
+     * Calls the specified callback function for all the elements in this iterator. The return value of the callback function is the accumulated result, and is provided as an argument in the next call to the callback function.
+     * @param callbackfn A function that accepts up to three arguments. The reduce method calls the callbackfn function one time for each element in the iterator.
+     * @param initialValue If initialValue is specified, it is used as the initial value to start the accumulation. The first call to the callbackfn function provides this value as an argument instead of a value from the iterator.
+     */
+    reduce(callbackfn: (previousValue: T, currentValue: T, currentIndex: number) => T): T;
+    reduce(callbackfn: (previousValue: T, currentValue: T, currentIndex: number) => T, initialValue: T): T;
+
+    /**
+     * Calls the specified callback function for all the elements in this iterator. The return value of the callback function is the accumulated result, and is provided as an argument in the next call to the callback function.
+     * @param callbackfn A function that accepts up to three arguments. The reduce method calls the callbackfn function one time for each element in the iterator.
+     * @param initialValue If initialValue is specified, it is used as the initial value to start the accumulation. The first call to the callbackfn function provides this value as an argument instead of a value from the iterator.
+     */
+    reduce<U>(callbackfn: (previousValue: U, currentValue: T, currentIndex: number) => U, initialValue: U): U;
+
+    /**
+     * Creates a new array from the values yielded by this iterator.
+     */
+    toArray(): Array<T>;
+
+    /**
+     * Performs the specified action for each element in the iterator.
+     * @param callbackfn  A function that accepts up to two arguments. forEach calls the callbackfn function one time for each element in the iterator.
+     */
+    forEach(callbackfn: (value: T, index: number) => void): void;
+
+    /**
+     * Determines whether the specified callback function returns true for any element of this iterator.
+     * @param predicate A function that accepts up to two arguments. The some method calls
+     * the predicate function for each element in this iterator until the predicate returns a value
+     * true, or until the end of the iterator.
+     */
+    some(predicate: (value: T, index: number) => unknown): boolean;
+
+    /**
+     * Determines whether all the members of this iterator satisfy the specified test.
+     * @param predicate A function that accepts up to two arguments. The every method calls
+     * the predicate function for each element in this iterator until the predicate returns
+     * false, or until the end of this iterator.
+     */
+    every(predicate: (value: T, index: number) => unknown): boolean;
+
+    /**
+     * Returns the value of the first element in this iterator where predicate is true, and undefined
+     * otherwise.
+     * @param predicate find calls predicate once for each element of this iterator, in
+     * order, until it finds one where predicate returns true. If such an element is found, find
+     * immediately returns that element value. Otherwise, find returns undefined.
+     */
+    find<S extends T>(predicate: (value: T, index: number) => value is S): S | undefined;
+    find(predicate: (value: T, index: number) => unknown): T | undefined;
+
+    readonly [Symbol.toStringTag]: "Iterator";
+}
+
+interface IteratorConstructor {
+    /**
+     * Creates a native iterator from an iterator or iterable object.
+     * Returns its input if the input already inherits from the built-in Iterator class.
+     * @param value An iterator or iterable object to convert a native iterator.
+     */
+    from<T>(value: Iterator<T> | Iterable<T>): NativeIterator<T>;
+}
+
+declare var Iterator: (abstract new <T>() => NativeIterator<T>) & IteratorConstructor;
+
+
+// TODO BEFORE MERGING: update all existing IterableIterator-return methods to return NativeIterator
+// I have only done a couple so far, for illustration
+
+interface Generator<T = unknown, TReturn = any, TNext = unknown> extends NativeIterator<T, TReturn, TNext> {
+}
+
+interface Array<T> {
+    /** Iterator */
+    [Symbol.iterator](): NativeIterator<T>;
+
+    /**
+     * Returns an iterable iterator of key, value pairs for every entry in the array
+     */
+    entries(): NativeIterator<[number, T]>;
+
+    /**
+     * Returns an iterable iterator of keys in the array
+     */
+    keys(): NativeIterator<number>;
+
+    /**
+     * Returns an iterable iterator of values in the array
+     */
+    values(): NativeIterator<T>;
+}
diff --git a/src/lib/libs.json b/src/lib/libs.json
index d97a25e09679f..5103307c2b24b 100644
--- a/src/lib/libs.json
+++ b/src/lib/libs.json
@@ -79,6 +79,7 @@
         "esnext.collection",
         "esnext.array",
         "esnext.regexp",
+        "esnext.iterator",
         "decorators",
         "decorators.legacy",
         // Default libraries
diff --git a/tests/cases/compiler/nativeIterator.ts b/tests/cases/compiler/nativeIterator.ts
new file mode 100644
index 0000000000000..7d7f445449806
--- /dev/null
+++ b/tests/cases/compiler/nativeIterator.ts
@@ -0,0 +1,30 @@
+// @target: esnext
+
+const iterator = Iterator.from([0, 1, 2]);
+
+const mapped = iterator.map(String);
+
+const filtered = iterator.filter(x => x > 0);
+
+function isZero(x: number): x is 0 {
+  return x === 0;
+}
+const zero = iterator.filter(isZero);
+
+const iteratorFromBare = Iterator.from({
+  next() {
+    return {
+      done: Math.random() < .5,
+      value: "a string",
+    };
+  },
+});
+
+
+function* gen() {
+  yield 0;
+}
+
+const mappedGen = gen().map(x => x === 0 ? "zero" : "other");
+
+const mappedValues = [0, 1, 2].values().map(x => x === 0 ? "zero" : "other");

From 075ce43595c5024453275989020ab97d6b6b5487 Mon Sep 17 00:00:00 2001
From: Kevin Gibbons <bakkot@gmail.com>
Date: Tue, 16 Apr 2024 19:50:50 -0700
Subject: [PATCH 2/9] run baselines

---
 .../reference/arrayFromAsync.symbols          |  18 +-
 tests/baselines/reference/awaitedType.types   |   1 +
 ...odule(moduleresolution=bundler).trace.json |  15 ++
 ...dule(moduleresolution=nodenext).trace.json |  15 ++
 .../reference/callWithSpread4.symbols         |   2 +-
 .../classFieldSuperAccessible.symbols         |   4 +-
 .../Parse --lib option with extra comma.js    |   2 +-
 ... --lib option with trailing white-space.js |   2 +-
 .../Parse invalid option of library flags.js  |   2 +-
 ...array to compiler-options with json api.js |   2 +-
 ...ompiler-options with jsonSourceFile api.js |   2 +-
 ... libs to compiler-options with json api.js |   2 +-
 ...ompiler-options with jsonSourceFile api.js |   2 +-
 ... libs to compiler-options with json api.js |   2 +-
 ...ompiler-options with jsonSourceFile api.js |   2 +-
 ... libs to compiler-options with json api.js |   2 +-
 ...ompiler-options with jsonSourceFile api.js |   2 +-
 ...lyTypeGeneratorReturnTypeFromUnion.symbols |   2 +-
 .../dependentDestructuredVariables.symbols    |   8 +-
 .../dependentDestructuredVariables.types      |   2 +-
 ...tructuredVariablesFromNestedPatterns.types |   4 +-
 .../esNextWeakRefs_IterableWeakMap.symbols    |   2 +-
 .../flatArrayNoExcessiveStackDepth.symbols    |   2 +-
 .../reference/generatorAssignability.symbols  |   8 +-
 .../generatorExplicitReturnType.symbols       |  10 +-
 .../generatorReturnContextualType.symbols     |   4 +-
 ...generatorReturnExpressionIsChecked.symbols |   2 +-
 ...nTypeIndirectReferenceToGlobalType.symbols |   2 +-
 .../generatorReturnTypeInference.symbols      |   2 +-
 ...eratorReturnTypeInferenceNonStrict.symbols |   2 +-
 .../generatorYieldContextualType.symbols      |   8 +-
 .../generatorYieldContextualType.types        |   3 +
 .../importExportInternalComments.symbols      |   2 +-
 .../reference/keyofAndIndexedAccess2.symbols  |   8 +-
 .../reference/modulePreserve2.trace.json      |  14 ++
 .../reference/modulePreserve3.trace.json      |  13 ++
 .../narrowingPastLastAssignment.symbols       |   2 +-
 tests/baselines/reference/nativeIterator.js   |  54 +++++
 .../reference/nativeIterator.symbols          |  86 +++++++
 .../baselines/reference/nativeIterator.types  | 216 ++++++++++++++++++
 .../noIterationTypeErrorsInCFA.symbols        |   2 +-
 ...sTypesVersions(module=nodenext).trace.json |  14 ++
 ...PackageImports(module=nodenext).trace.json |  15 ++
 ...xportsTrailers(module=nodenext).trace.json |  14 ++
 .../reactJsxReactResolvedNodeNext.trace.json  |  13 ++
 ...eactJsxReactResolvedNodeNextEsm.trace.json |  13 ++
 .../recursiveConditionalTypes.symbols         |   4 +-
 .../taggedTemplatesWithTypeArguments1.symbols |   2 +-
 ...does-not-add-color-when-NO_COLOR-is-set.js |   2 +-
 ...-when-host-can't-provide-terminal-width.js |   2 +-
 ...tatus.DiagnosticsPresent_OutputsSkipped.js |   2 +-
 .../telemetry/does-not-expose-paths.js        |   2 +-
 .../typeGuardConstructorNarrowAny.symbols     |   2 +-
 ...typeGuardConstructorPrimitiveTypes.symbols |   2 +-
 ...eldWithUnionInContextualReturnType.symbols |   2 +-
 .../types.asyncGenerators.es2018.2.symbols    |   2 +-
 .../typesVersions.ambientModules.trace.json   |  14 ++
 .../typesVersions.emptyTypes.trace.json       |  15 ++
 .../typesVersions.justIndex.trace.json        |  15 ++
 .../typesVersions.multiFile.trace.json        |  14 ++
 ...VersionsDeclarationEmit.ambient.trace.json |  14 ++
 ...rsionsDeclarationEmit.multiFile.trace.json |  14 ++
 ...it.multiFileBackReferenceToSelf.trace.json |  14 ++
 ...ultiFileBackReferenceToUnmapped.trace.json |  14 ++
 .../unionAndIntersectionInference3.symbols    |   4 +-
 65 files changed, 672 insertions(+), 72 deletions(-)
 create mode 100644 tests/baselines/reference/nativeIterator.js
 create mode 100644 tests/baselines/reference/nativeIterator.symbols
 create mode 100644 tests/baselines/reference/nativeIterator.types

diff --git a/tests/baselines/reference/arrayFromAsync.symbols b/tests/baselines/reference/arrayFromAsync.symbols
index 81154e0a90567..0b6e3e2c0463e 100644
--- a/tests/baselines/reference/arrayFromAsync.symbols
+++ b/tests/baselines/reference/arrayFromAsync.symbols
@@ -82,14 +82,14 @@ for await (const v of asyncGen(4)) {
 const sameArr1 = await Array.fromAsync(arrLike);
 >sameArr1 : Symbol(sameArr1, Decl(arrayFromAsync.ts, 25, 5))
 >Array.fromAsync : Symbol(ArrayConstructor.fromAsync, Decl(lib.esnext.array.d.ts, --, --), Decl(lib.esnext.array.d.ts, --, --))
->Array : Symbol(Array, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.symbol.wellknown.d.ts, --, --) ... and 4 more)
+>Array : Symbol(Array, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.symbol.wellknown.d.ts, --, --) ... and 5 more)
 >fromAsync : Symbol(ArrayConstructor.fromAsync, Decl(lib.esnext.array.d.ts, --, --), Decl(lib.esnext.array.d.ts, --, --))
 >arrLike : Symbol(arrLike, Decl(arrayFromAsync.ts, 12, 5))
 
 const sameArr2 = await Array.fromAsync([Promise.resolve(0), Promise.resolve(2), Promise.resolve(4), Promise.resolve(6)]);
 >sameArr2 : Symbol(sameArr2, Decl(arrayFromAsync.ts, 26, 5))
 >Array.fromAsync : Symbol(ArrayConstructor.fromAsync, Decl(lib.esnext.array.d.ts, --, --), Decl(lib.esnext.array.d.ts, --, --))
->Array : Symbol(Array, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.symbol.wellknown.d.ts, --, --) ... and 4 more)
+>Array : Symbol(Array, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.symbol.wellknown.d.ts, --, --) ... and 5 more)
 >fromAsync : Symbol(ArrayConstructor.fromAsync, Decl(lib.esnext.array.d.ts, --, --), Decl(lib.esnext.array.d.ts, --, --))
 >Promise.resolve : Symbol(PromiseConstructor.resolve, Decl(lib.es2015.promise.d.ts, --, --), Decl(lib.es2015.promise.d.ts, --, --), Decl(lib.es2015.promise.d.ts, --, --))
 >Promise : Symbol(Promise, Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.promise.d.ts, --, --), Decl(lib.es2015.symbol.wellknown.d.ts, --, --), Decl(lib.es2018.promise.d.ts, --, --))
@@ -107,14 +107,14 @@ const sameArr2 = await Array.fromAsync([Promise.resolve(0), Promise.resolve(2),
 const sameArr3 = await Array.fromAsync(genPromises(4));
 >sameArr3 : Symbol(sameArr3, Decl(arrayFromAsync.ts, 27, 5))
 >Array.fromAsync : Symbol(ArrayConstructor.fromAsync, Decl(lib.esnext.array.d.ts, --, --), Decl(lib.esnext.array.d.ts, --, --))
->Array : Symbol(Array, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.symbol.wellknown.d.ts, --, --) ... and 4 more)
+>Array : Symbol(Array, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.symbol.wellknown.d.ts, --, --) ... and 5 more)
 >fromAsync : Symbol(ArrayConstructor.fromAsync, Decl(lib.esnext.array.d.ts, --, --), Decl(lib.esnext.array.d.ts, --, --))
 >genPromises : Symbol(genPromises, Decl(arrayFromAsync.ts, 4, 3))
 
 const sameArr4 = await Array.fromAsync(asyncGen(4));
 >sameArr4 : Symbol(sameArr4, Decl(arrayFromAsync.ts, 28, 5))
 >Array.fromAsync : Symbol(ArrayConstructor.fromAsync, Decl(lib.esnext.array.d.ts, --, --), Decl(lib.esnext.array.d.ts, --, --))
->Array : Symbol(Array, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.symbol.wellknown.d.ts, --, --) ... and 4 more)
+>Array : Symbol(Array, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.symbol.wellknown.d.ts, --, --) ... and 5 more)
 >fromAsync : Symbol(ArrayConstructor.fromAsync, Decl(lib.esnext.array.d.ts, --, --), Decl(lib.esnext.array.d.ts, --, --))
 >asyncGen : Symbol(asyncGen, Decl(arrayFromAsync.ts, 0, 11))
 
@@ -127,7 +127,7 @@ Data.fromAsync = Array.fromAsync;
 >Data : Symbol(Data, Decl(arrayFromAsync.ts, 28, 52), Decl(arrayFromAsync.ts, 30, 20))
 >fromAsync : Symbol(Data.fromAsync, Decl(arrayFromAsync.ts, 30, 20))
 >Array.fromAsync : Symbol(ArrayConstructor.fromAsync, Decl(lib.esnext.array.d.ts, --, --), Decl(lib.esnext.array.d.ts, --, --))
->Array : Symbol(Array, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.symbol.wellknown.d.ts, --, --) ... and 4 more)
+>Array : Symbol(Array, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.symbol.wellknown.d.ts, --, --) ... and 5 more)
 >fromAsync : Symbol(ArrayConstructor.fromAsync, Decl(lib.esnext.array.d.ts, --, --), Decl(lib.esnext.array.d.ts, --, --))
 
 const sameArr5 = await Data.fromAsync(asyncGen(4));
@@ -140,7 +140,7 @@ const sameArr5 = await Data.fromAsync(asyncGen(4));
 const mapArr1 = await Array.fromAsync(asyncGen(4), v => v ** 2);
 >mapArr1 : Symbol(mapArr1, Decl(arrayFromAsync.ts, 34, 5))
 >Array.fromAsync : Symbol(ArrayConstructor.fromAsync, Decl(lib.esnext.array.d.ts, --, --), Decl(lib.esnext.array.d.ts, --, --))
->Array : Symbol(Array, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.symbol.wellknown.d.ts, --, --) ... and 4 more)
+>Array : Symbol(Array, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.symbol.wellknown.d.ts, --, --) ... and 5 more)
 >fromAsync : Symbol(ArrayConstructor.fromAsync, Decl(lib.esnext.array.d.ts, --, --), Decl(lib.esnext.array.d.ts, --, --))
 >asyncGen : Symbol(asyncGen, Decl(arrayFromAsync.ts, 0, 11))
 >v : Symbol(v, Decl(arrayFromAsync.ts, 34, 50))
@@ -149,7 +149,7 @@ const mapArr1 = await Array.fromAsync(asyncGen(4), v => v ** 2);
 const mapArr2 = await Array.fromAsync([0,2,4,6], v => Promise.resolve(v ** 2));
 >mapArr2 : Symbol(mapArr2, Decl(arrayFromAsync.ts, 35, 5))
 >Array.fromAsync : Symbol(ArrayConstructor.fromAsync, Decl(lib.esnext.array.d.ts, --, --), Decl(lib.esnext.array.d.ts, --, --))
->Array : Symbol(Array, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.symbol.wellknown.d.ts, --, --) ... and 4 more)
+>Array : Symbol(Array, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.symbol.wellknown.d.ts, --, --) ... and 5 more)
 >fromAsync : Symbol(ArrayConstructor.fromAsync, Decl(lib.esnext.array.d.ts, --, --), Decl(lib.esnext.array.d.ts, --, --))
 >v : Symbol(v, Decl(arrayFromAsync.ts, 35, 48))
 >Promise.resolve : Symbol(PromiseConstructor.resolve, Decl(lib.es2015.promise.d.ts, --, --), Decl(lib.es2015.promise.d.ts, --, --), Decl(lib.es2015.promise.d.ts, --, --))
@@ -160,7 +160,7 @@ const mapArr2 = await Array.fromAsync([0,2,4,6], v => Promise.resolve(v ** 2));
 const mapArr3 = await Array.fromAsync([0,2,4,6], v => v ** 2);
 >mapArr3 : Symbol(mapArr3, Decl(arrayFromAsync.ts, 36, 5))
 >Array.fromAsync : Symbol(ArrayConstructor.fromAsync, Decl(lib.esnext.array.d.ts, --, --), Decl(lib.esnext.array.d.ts, --, --))
->Array : Symbol(Array, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.symbol.wellknown.d.ts, --, --) ... and 4 more)
+>Array : Symbol(Array, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.symbol.wellknown.d.ts, --, --) ... and 5 more)
 >fromAsync : Symbol(ArrayConstructor.fromAsync, Decl(lib.esnext.array.d.ts, --, --), Decl(lib.esnext.array.d.ts, --, --))
 >v : Symbol(v, Decl(arrayFromAsync.ts, 36, 48))
 >v : Symbol(v, Decl(arrayFromAsync.ts, 36, 48))
@@ -181,7 +181,7 @@ const badIterable = { [Symbol.iterator] () { throw err; } };
 const badArray = await Array.fromAsync(badIterable);
 >badArray : Symbol(badArray, Decl(arrayFromAsync.ts, 41, 5))
 >Array.fromAsync : Symbol(ArrayConstructor.fromAsync, Decl(lib.esnext.array.d.ts, --, --), Decl(lib.esnext.array.d.ts, --, --))
->Array : Symbol(Array, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.symbol.wellknown.d.ts, --, --) ... and 4 more)
+>Array : Symbol(Array, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.symbol.wellknown.d.ts, --, --) ... and 5 more)
 >fromAsync : Symbol(ArrayConstructor.fromAsync, Decl(lib.esnext.array.d.ts, --, --), Decl(lib.esnext.array.d.ts, --, --))
 >badIterable : Symbol(badIterable, Decl(arrayFromAsync.ts, 39, 5))
 
diff --git a/tests/baselines/reference/awaitedType.types b/tests/baselines/reference/awaitedType.types
index 2f541fa0f0c03..51a77de358539 100644
--- a/tests/baselines/reference/awaitedType.types
+++ b/tests/baselines/reference/awaitedType.types
@@ -1,6 +1,7 @@
 //// [tests/cases/compiler/awaitedType.ts] ////
 
 === Performance Stats ===
+Type Count: 1,000
 Instantiation count: 25,000
 
 === awaitedType.ts ===
diff --git a/tests/baselines/reference/bundlerDirectoryModule(moduleresolution=bundler).trace.json b/tests/baselines/reference/bundlerDirectoryModule(moduleresolution=bundler).trace.json
index 6a9e7816773e6..627a7432632c9 100644
--- a/tests/baselines/reference/bundlerDirectoryModule(moduleresolution=bundler).trace.json
+++ b/tests/baselines/reference/bundlerDirectoryModule(moduleresolution=bundler).trace.json
@@ -1074,6 +1074,21 @@
     "======== Module name '@typescript/lib-esnext/regexp' was not resolved. ========",
     "File '/.ts/package.json' does not exist according to earlier cached lookups.",
     "File '/package.json' does not exist according to earlier cached lookups.",
+    "======== Resolving module '@typescript/lib-esnext/iterator' from '/.src/__lib_node_modules_lookup_lib.esnext.iterator.d.ts__.ts'. ========",
+    "Explicitly specified module resolution kind: 'Node10'.",
+    "Loading module '@typescript/lib-esnext/iterator' from 'node_modules' folder, target file types: TypeScript, Declaration.",
+    "Searching all ancestor node_modules directories for preferred extensions: TypeScript, Declaration.",
+    "Directory '/.src/node_modules' does not exist, skipping all lookups in it.",
+    "Scoped package detected, looking in 'typescript__lib-esnext/iterator'",
+    "Directory '/node_modules' does not exist, skipping all lookups in it.",
+    "Scoped package detected, looking in 'typescript__lib-esnext/iterator'",
+    "Loading module '@typescript/lib-esnext/iterator' from 'node_modules' folder, target file types: JavaScript.",
+    "Searching all ancestor node_modules directories for fallback extensions: JavaScript.",
+    "Directory '/.src/node_modules' does not exist, skipping all lookups in it.",
+    "Directory '/node_modules' does not exist, skipping all lookups in it.",
+    "======== Module name '@typescript/lib-esnext/iterator' was not resolved. ========",
+    "File '/.ts/package.json' does not exist according to earlier cached lookups.",
+    "File '/package.json' does not exist according to earlier cached lookups.",
     "======== Resolving module '@typescript/lib-dom' from '/.src/__lib_node_modules_lookup_lib.dom.d.ts__.ts'. ========",
     "Explicitly specified module resolution kind: 'Node10'.",
     "Loading module '@typescript/lib-dom' from 'node_modules' folder, target file types: TypeScript, Declaration.",
diff --git a/tests/baselines/reference/bundlerDirectoryModule(moduleresolution=nodenext).trace.json b/tests/baselines/reference/bundlerDirectoryModule(moduleresolution=nodenext).trace.json
index d20de95869c4e..55ca42917a3ad 100644
--- a/tests/baselines/reference/bundlerDirectoryModule(moduleresolution=nodenext).trace.json
+++ b/tests/baselines/reference/bundlerDirectoryModule(moduleresolution=nodenext).trace.json
@@ -1074,6 +1074,21 @@
     "======== Module name '@typescript/lib-esnext/regexp' was not resolved. ========",
     "File '/.ts/package.json' does not exist according to earlier cached lookups.",
     "File '/package.json' does not exist according to earlier cached lookups.",
+    "======== Resolving module '@typescript/lib-esnext/iterator' from '/.src/__lib_node_modules_lookup_lib.esnext.iterator.d.ts__.ts'. ========",
+    "Explicitly specified module resolution kind: 'Node10'.",
+    "Loading module '@typescript/lib-esnext/iterator' from 'node_modules' folder, target file types: TypeScript, Declaration.",
+    "Searching all ancestor node_modules directories for preferred extensions: TypeScript, Declaration.",
+    "Directory '/.src/node_modules' does not exist, skipping all lookups in it.",
+    "Scoped package detected, looking in 'typescript__lib-esnext/iterator'",
+    "Directory '/node_modules' does not exist, skipping all lookups in it.",
+    "Scoped package detected, looking in 'typescript__lib-esnext/iterator'",
+    "Loading module '@typescript/lib-esnext/iterator' from 'node_modules' folder, target file types: JavaScript.",
+    "Searching all ancestor node_modules directories for fallback extensions: JavaScript.",
+    "Directory '/.src/node_modules' does not exist, skipping all lookups in it.",
+    "Directory '/node_modules' does not exist, skipping all lookups in it.",
+    "======== Module name '@typescript/lib-esnext/iterator' was not resolved. ========",
+    "File '/.ts/package.json' does not exist according to earlier cached lookups.",
+    "File '/package.json' does not exist according to earlier cached lookups.",
     "======== Resolving module '@typescript/lib-dom' from '/.src/__lib_node_modules_lookup_lib.dom.d.ts__.ts'. ========",
     "Explicitly specified module resolution kind: 'Node10'.",
     "Loading module '@typescript/lib-dom' from 'node_modules' folder, target file types: TypeScript, Declaration.",
diff --git a/tests/baselines/reference/callWithSpread4.symbols b/tests/baselines/reference/callWithSpread4.symbols
index 1de6a352dfb4c..3cf1d8a384ded 100644
--- a/tests/baselines/reference/callWithSpread4.symbols
+++ b/tests/baselines/reference/callWithSpread4.symbols
@@ -45,7 +45,7 @@ declare const pli: {
 >RW : Symbol(RW, Decl(callWithSpread4.ts, 1, 22))
 >W : Symbol(W, Decl(callWithSpread4.ts, 0, 22))
 >streams : Symbol(streams, Decl(callWithSpread4.ts, 6, 23))
->Array : Symbol(Array, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.symbol.wellknown.d.ts, --, --) ... and 4 more)
+>Array : Symbol(Array, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.symbol.wellknown.d.ts, --, --) ... and 5 more)
 >RW : Symbol(RW, Decl(callWithSpread4.ts, 1, 22))
 >W : Symbol(W, Decl(callWithSpread4.ts, 0, 22))
 >Promise : Symbol(Promise, Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.promise.d.ts, --, --), Decl(lib.es2015.symbol.wellknown.d.ts, --, --), Decl(lib.es2018.promise.d.ts, --, --))
diff --git a/tests/baselines/reference/classFieldSuperAccessible.symbols b/tests/baselines/reference/classFieldSuperAccessible.symbols
index 9d23d58215b51..7697949bd5ef7 100644
--- a/tests/baselines/reference/classFieldSuperAccessible.symbols
+++ b/tests/baselines/reference/classFieldSuperAccessible.symbols
@@ -31,7 +31,7 @@ class B extends Number {
 }
 class C extends Array {
 >C : Symbol(C, Decl(classFieldSuperAccessible.ts, 9, 1))
->Array : Symbol(Array, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.symbol.wellknown.d.ts, --, --) ... and 4 more)
+>Array : Symbol(Array, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.symbol.wellknown.d.ts, --, --) ... and 5 more)
 
     foo() {
 >foo : Symbol(C.foo, Decl(classFieldSuperAccessible.ts, 10, 23))
@@ -41,7 +41,7 @@ class C extends Array {
 >console : Symbol(console, Decl(lib.dom.d.ts, --, --))
 >log : Symbol(Console.log, Decl(lib.dom.d.ts, --, --))
 >super.length : Symbol(Array.length, Decl(lib.es5.d.ts, --, --))
->super : Symbol(Array, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.symbol.wellknown.d.ts, --, --) ... and 4 more)
+>super : Symbol(Array, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.symbol.wellknown.d.ts, --, --) ... and 5 more)
 >length : Symbol(Array.length, Decl(lib.es5.d.ts, --, --))
     }
 }
diff --git a/tests/baselines/reference/config/commandLineParsing/parseCommandLine/Parse --lib option with extra comma.js b/tests/baselines/reference/config/commandLineParsing/parseCommandLine/Parse --lib option with extra comma.js
index 44a56c66ec5b6..cfcd52b395baf 100644
--- a/tests/baselines/reference/config/commandLineParsing/parseCommandLine/Parse --lib option with extra comma.js	
+++ b/tests/baselines/reference/config/commandLineParsing/parseCommandLine/Parse --lib option with extra comma.js	
@@ -10,4 +10,4 @@ WatchOptions::
 FileNames::
 es7,0.ts
 Errors::
-error TS6046: Argument for '--lib' option must be: 'es5', 'es6', 'es2015', 'es7', 'es2016', 'es2017', 'es2018', 'es2019', 'es2020', 'es2021', 'es2022', 'es2023', 'esnext', 'dom', 'dom.iterable', 'dom.asynciterable', 'webworker', 'webworker.importscripts', 'webworker.iterable', 'webworker.asynciterable', 'scripthost', 'es2015.core', 'es2015.collection', 'es2015.generator', 'es2015.iterable', 'es2015.promise', 'es2015.proxy', 'es2015.reflect', 'es2015.symbol', 'es2015.symbol.wellknown', 'es2016.array.include', 'es2016.intl', 'es2017.date', 'es2017.object', 'es2017.sharedmemory', 'es2017.string', 'es2017.intl', 'es2017.typedarrays', 'es2018.asyncgenerator', 'es2018.asynciterable', 'es2018.intl', 'es2018.promise', 'es2018.regexp', 'es2019.array', 'es2019.object', 'es2019.string', 'es2019.symbol', 'es2019.intl', 'es2020.bigint', 'es2020.date', 'es2020.promise', 'es2020.sharedmemory', 'es2020.string', 'es2020.symbol.wellknown', 'es2020.intl', 'es2020.number', 'es2021.promise', 'es2021.string', 'es2021.weakref', 'es2021.intl', 'es2022.array', 'es2022.error', 'es2022.intl', 'es2022.object', 'es2022.sharedmemory', 'es2022.string', 'es2022.regexp', 'es2023.array', 'es2023.collection', 'es2023.intl', 'esnext.array', 'esnext.collection', 'esnext.symbol', 'esnext.asynciterable', 'esnext.intl', 'esnext.disposable', 'esnext.bigint', 'esnext.string', 'esnext.promise', 'esnext.weakref', 'esnext.decorators', 'esnext.object', 'esnext.regexp', 'decorators', 'decorators.legacy'.
+error TS6046: Argument for '--lib' option must be: 'es5', 'es6', 'es2015', 'es7', 'es2016', 'es2017', 'es2018', 'es2019', 'es2020', 'es2021', 'es2022', 'es2023', 'esnext', 'dom', 'dom.iterable', 'dom.asynciterable', 'webworker', 'webworker.importscripts', 'webworker.iterable', 'webworker.asynciterable', 'scripthost', 'es2015.core', 'es2015.collection', 'es2015.generator', 'es2015.iterable', 'es2015.promise', 'es2015.proxy', 'es2015.reflect', 'es2015.symbol', 'es2015.symbol.wellknown', 'es2016.array.include', 'es2016.intl', 'es2017.date', 'es2017.object', 'es2017.sharedmemory', 'es2017.string', 'es2017.intl', 'es2017.typedarrays', 'es2018.asyncgenerator', 'es2018.asynciterable', 'es2018.intl', 'es2018.promise', 'es2018.regexp', 'es2019.array', 'es2019.object', 'es2019.string', 'es2019.symbol', 'es2019.intl', 'es2020.bigint', 'es2020.date', 'es2020.promise', 'es2020.sharedmemory', 'es2020.string', 'es2020.symbol.wellknown', 'es2020.intl', 'es2020.number', 'es2021.promise', 'es2021.string', 'es2021.weakref', 'es2021.intl', 'es2022.array', 'es2022.error', 'es2022.intl', 'es2022.object', 'es2022.sharedmemory', 'es2022.string', 'es2022.regexp', 'es2023.array', 'es2023.collection', 'es2023.intl', 'esnext.array', 'esnext.collection', 'esnext.symbol', 'esnext.asynciterable', 'esnext.intl', 'esnext.disposable', 'esnext.bigint', 'esnext.string', 'esnext.promise', 'esnext.weakref', 'esnext.decorators', 'esnext.object', 'esnext.regexp', 'esnext.iterator', 'decorators', 'decorators.legacy'.
diff --git a/tests/baselines/reference/config/commandLineParsing/parseCommandLine/Parse --lib option with trailing white-space.js b/tests/baselines/reference/config/commandLineParsing/parseCommandLine/Parse --lib option with trailing white-space.js
index 87aeb7b21a2f3..596b4249a3c7a 100644
--- a/tests/baselines/reference/config/commandLineParsing/parseCommandLine/Parse --lib option with trailing white-space.js	
+++ b/tests/baselines/reference/config/commandLineParsing/parseCommandLine/Parse --lib option with trailing white-space.js	
@@ -10,4 +10,4 @@ WatchOptions::
 FileNames::
 es7,0.ts
 Errors::
-error TS6046: Argument for '--lib' option must be: 'es5', 'es6', 'es2015', 'es7', 'es2016', 'es2017', 'es2018', 'es2019', 'es2020', 'es2021', 'es2022', 'es2023', 'esnext', 'dom', 'dom.iterable', 'dom.asynciterable', 'webworker', 'webworker.importscripts', 'webworker.iterable', 'webworker.asynciterable', 'scripthost', 'es2015.core', 'es2015.collection', 'es2015.generator', 'es2015.iterable', 'es2015.promise', 'es2015.proxy', 'es2015.reflect', 'es2015.symbol', 'es2015.symbol.wellknown', 'es2016.array.include', 'es2016.intl', 'es2017.date', 'es2017.object', 'es2017.sharedmemory', 'es2017.string', 'es2017.intl', 'es2017.typedarrays', 'es2018.asyncgenerator', 'es2018.asynciterable', 'es2018.intl', 'es2018.promise', 'es2018.regexp', 'es2019.array', 'es2019.object', 'es2019.string', 'es2019.symbol', 'es2019.intl', 'es2020.bigint', 'es2020.date', 'es2020.promise', 'es2020.sharedmemory', 'es2020.string', 'es2020.symbol.wellknown', 'es2020.intl', 'es2020.number', 'es2021.promise', 'es2021.string', 'es2021.weakref', 'es2021.intl', 'es2022.array', 'es2022.error', 'es2022.intl', 'es2022.object', 'es2022.sharedmemory', 'es2022.string', 'es2022.regexp', 'es2023.array', 'es2023.collection', 'es2023.intl', 'esnext.array', 'esnext.collection', 'esnext.symbol', 'esnext.asynciterable', 'esnext.intl', 'esnext.disposable', 'esnext.bigint', 'esnext.string', 'esnext.promise', 'esnext.weakref', 'esnext.decorators', 'esnext.object', 'esnext.regexp', 'decorators', 'decorators.legacy'.
+error TS6046: Argument for '--lib' option must be: 'es5', 'es6', 'es2015', 'es7', 'es2016', 'es2017', 'es2018', 'es2019', 'es2020', 'es2021', 'es2022', 'es2023', 'esnext', 'dom', 'dom.iterable', 'dom.asynciterable', 'webworker', 'webworker.importscripts', 'webworker.iterable', 'webworker.asynciterable', 'scripthost', 'es2015.core', 'es2015.collection', 'es2015.generator', 'es2015.iterable', 'es2015.promise', 'es2015.proxy', 'es2015.reflect', 'es2015.symbol', 'es2015.symbol.wellknown', 'es2016.array.include', 'es2016.intl', 'es2017.date', 'es2017.object', 'es2017.sharedmemory', 'es2017.string', 'es2017.intl', 'es2017.typedarrays', 'es2018.asyncgenerator', 'es2018.asynciterable', 'es2018.intl', 'es2018.promise', 'es2018.regexp', 'es2019.array', 'es2019.object', 'es2019.string', 'es2019.symbol', 'es2019.intl', 'es2020.bigint', 'es2020.date', 'es2020.promise', 'es2020.sharedmemory', 'es2020.string', 'es2020.symbol.wellknown', 'es2020.intl', 'es2020.number', 'es2021.promise', 'es2021.string', 'es2021.weakref', 'es2021.intl', 'es2022.array', 'es2022.error', 'es2022.intl', 'es2022.object', 'es2022.sharedmemory', 'es2022.string', 'es2022.regexp', 'es2023.array', 'es2023.collection', 'es2023.intl', 'esnext.array', 'esnext.collection', 'esnext.symbol', 'esnext.asynciterable', 'esnext.intl', 'esnext.disposable', 'esnext.bigint', 'esnext.string', 'esnext.promise', 'esnext.weakref', 'esnext.decorators', 'esnext.object', 'esnext.regexp', 'esnext.iterator', 'decorators', 'decorators.legacy'.
diff --git a/tests/baselines/reference/config/commandLineParsing/parseCommandLine/Parse invalid option of library flags.js b/tests/baselines/reference/config/commandLineParsing/parseCommandLine/Parse invalid option of library flags.js
index 0213cdbf5b8cd..807f4f9583f0f 100644
--- a/tests/baselines/reference/config/commandLineParsing/parseCommandLine/Parse invalid option of library flags.js	
+++ b/tests/baselines/reference/config/commandLineParsing/parseCommandLine/Parse invalid option of library flags.js	
@@ -10,4 +10,4 @@ WatchOptions::
 FileNames::
 0.ts
 Errors::
-error TS6046: Argument for '--lib' option must be: 'es5', 'es6', 'es2015', 'es7', 'es2016', 'es2017', 'es2018', 'es2019', 'es2020', 'es2021', 'es2022', 'es2023', 'esnext', 'dom', 'dom.iterable', 'dom.asynciterable', 'webworker', 'webworker.importscripts', 'webworker.iterable', 'webworker.asynciterable', 'scripthost', 'es2015.core', 'es2015.collection', 'es2015.generator', 'es2015.iterable', 'es2015.promise', 'es2015.proxy', 'es2015.reflect', 'es2015.symbol', 'es2015.symbol.wellknown', 'es2016.array.include', 'es2016.intl', 'es2017.date', 'es2017.object', 'es2017.sharedmemory', 'es2017.string', 'es2017.intl', 'es2017.typedarrays', 'es2018.asyncgenerator', 'es2018.asynciterable', 'es2018.intl', 'es2018.promise', 'es2018.regexp', 'es2019.array', 'es2019.object', 'es2019.string', 'es2019.symbol', 'es2019.intl', 'es2020.bigint', 'es2020.date', 'es2020.promise', 'es2020.sharedmemory', 'es2020.string', 'es2020.symbol.wellknown', 'es2020.intl', 'es2020.number', 'es2021.promise', 'es2021.string', 'es2021.weakref', 'es2021.intl', 'es2022.array', 'es2022.error', 'es2022.intl', 'es2022.object', 'es2022.sharedmemory', 'es2022.string', 'es2022.regexp', 'es2023.array', 'es2023.collection', 'es2023.intl', 'esnext.array', 'esnext.collection', 'esnext.symbol', 'esnext.asynciterable', 'esnext.intl', 'esnext.disposable', 'esnext.bigint', 'esnext.string', 'esnext.promise', 'esnext.weakref', 'esnext.decorators', 'esnext.object', 'esnext.regexp', 'decorators', 'decorators.legacy'.
+error TS6046: Argument for '--lib' option must be: 'es5', 'es6', 'es2015', 'es7', 'es2016', 'es2017', 'es2018', 'es2019', 'es2020', 'es2021', 'es2022', 'es2023', 'esnext', 'dom', 'dom.iterable', 'dom.asynciterable', 'webworker', 'webworker.importscripts', 'webworker.iterable', 'webworker.asynciterable', 'scripthost', 'es2015.core', 'es2015.collection', 'es2015.generator', 'es2015.iterable', 'es2015.promise', 'es2015.proxy', 'es2015.reflect', 'es2015.symbol', 'es2015.symbol.wellknown', 'es2016.array.include', 'es2016.intl', 'es2017.date', 'es2017.object', 'es2017.sharedmemory', 'es2017.string', 'es2017.intl', 'es2017.typedarrays', 'es2018.asyncgenerator', 'es2018.asynciterable', 'es2018.intl', 'es2018.promise', 'es2018.regexp', 'es2019.array', 'es2019.object', 'es2019.string', 'es2019.symbol', 'es2019.intl', 'es2020.bigint', 'es2020.date', 'es2020.promise', 'es2020.sharedmemory', 'es2020.string', 'es2020.symbol.wellknown', 'es2020.intl', 'es2020.number', 'es2021.promise', 'es2021.string', 'es2021.weakref', 'es2021.intl', 'es2022.array', 'es2022.error', 'es2022.intl', 'es2022.object', 'es2022.sharedmemory', 'es2022.string', 'es2022.regexp', 'es2023.array', 'es2023.collection', 'es2023.intl', 'esnext.array', 'esnext.collection', 'esnext.symbol', 'esnext.asynciterable', 'esnext.intl', 'esnext.disposable', 'esnext.bigint', 'esnext.string', 'esnext.promise', 'esnext.weakref', 'esnext.decorators', 'esnext.object', 'esnext.regexp', 'esnext.iterator', 'decorators', 'decorators.legacy'.
diff --git a/tests/baselines/reference/config/convertCompilerOptionsFromJson/Convert empty string option of libs array to compiler-options with json api.js b/tests/baselines/reference/config/convertCompilerOptionsFromJson/Convert empty string option of libs array to compiler-options with json api.js
index 04028e2fda1d2..29cc5e97530d6 100644
--- a/tests/baselines/reference/config/convertCompilerOptionsFromJson/Convert empty string option of libs array to compiler-options with json api.js	
+++ b/tests/baselines/reference/config/convertCompilerOptionsFromJson/Convert empty string option of libs array to compiler-options with json api.js	
@@ -30,5 +30,5 @@ CompilerOptions::
   "configFilePath": "/apath/tsconfig.json"
 }
 Errors::
-error TS6046: Argument for '--lib' option must be: 'es5', 'es6', 'es2015', 'es7', 'es2016', 'es2017', 'es2018', 'es2019', 'es2020', 'es2021', 'es2022', 'es2023', 'esnext', 'dom', 'dom.iterable', 'dom.asynciterable', 'webworker', 'webworker.importscripts', 'webworker.iterable', 'webworker.asynciterable', 'scripthost', 'es2015.core', 'es2015.collection', 'es2015.generator', 'es2015.iterable', 'es2015.promise', 'es2015.proxy', 'es2015.reflect', 'es2015.symbol', 'es2015.symbol.wellknown', 'es2016.array.include', 'es2016.intl', 'es2017.date', 'es2017.object', 'es2017.sharedmemory', 'es2017.string', 'es2017.intl', 'es2017.typedarrays', 'es2018.asyncgenerator', 'es2018.asynciterable', 'es2018.intl', 'es2018.promise', 'es2018.regexp', 'es2019.array', 'es2019.object', 'es2019.string', 'es2019.symbol', 'es2019.intl', 'es2020.bigint', 'es2020.date', 'es2020.promise', 'es2020.sharedmemory', 'es2020.string', 'es2020.symbol.wellknown', 'es2020.intl', 'es2020.number', 'es2021.promise', 'es2021.string', 'es2021.weakref', 'es2021.intl', 'es2022.array', 'es2022.error', 'es2022.intl', 'es2022.object', 'es2022.sharedmemory', 'es2022.string', 'es2022.regexp', 'es2023.array', 'es2023.collection', 'es2023.intl', 'esnext.array', 'esnext.collection', 'esnext.symbol', 'esnext.asynciterable', 'esnext.intl', 'esnext.disposable', 'esnext.bigint', 'esnext.string', 'esnext.promise', 'esnext.weakref', 'esnext.decorators', 'esnext.object', 'esnext.regexp', 'decorators', 'decorators.legacy'.
+error TS6046: Argument for '--lib' option must be: 'es5', 'es6', 'es2015', 'es7', 'es2016', 'es2017', 'es2018', 'es2019', 'es2020', 'es2021', 'es2022', 'es2023', 'esnext', 'dom', 'dom.iterable', 'dom.asynciterable', 'webworker', 'webworker.importscripts', 'webworker.iterable', 'webworker.asynciterable', 'scripthost', 'es2015.core', 'es2015.collection', 'es2015.generator', 'es2015.iterable', 'es2015.promise', 'es2015.proxy', 'es2015.reflect', 'es2015.symbol', 'es2015.symbol.wellknown', 'es2016.array.include', 'es2016.intl', 'es2017.date', 'es2017.object', 'es2017.sharedmemory', 'es2017.string', 'es2017.intl', 'es2017.typedarrays', 'es2018.asyncgenerator', 'es2018.asynciterable', 'es2018.intl', 'es2018.promise', 'es2018.regexp', 'es2019.array', 'es2019.object', 'es2019.string', 'es2019.symbol', 'es2019.intl', 'es2020.bigint', 'es2020.date', 'es2020.promise', 'es2020.sharedmemory', 'es2020.string', 'es2020.symbol.wellknown', 'es2020.intl', 'es2020.number', 'es2021.promise', 'es2021.string', 'es2021.weakref', 'es2021.intl', 'es2022.array', 'es2022.error', 'es2022.intl', 'es2022.object', 'es2022.sharedmemory', 'es2022.string', 'es2022.regexp', 'es2023.array', 'es2023.collection', 'es2023.intl', 'esnext.array', 'esnext.collection', 'esnext.symbol', 'esnext.asynciterable', 'esnext.intl', 'esnext.disposable', 'esnext.bigint', 'esnext.string', 'esnext.promise', 'esnext.weakref', 'esnext.decorators', 'esnext.object', 'esnext.regexp', 'esnext.iterator', 'decorators', 'decorators.legacy'.
 
diff --git a/tests/baselines/reference/config/convertCompilerOptionsFromJson/Convert empty string option of libs array to compiler-options with jsonSourceFile api.js b/tests/baselines/reference/config/convertCompilerOptionsFromJson/Convert empty string option of libs array to compiler-options with jsonSourceFile api.js
index 768504a015812..5166204b479ea 100644
--- a/tests/baselines/reference/config/convertCompilerOptionsFromJson/Convert empty string option of libs array to compiler-options with jsonSourceFile api.js	
+++ b/tests/baselines/reference/config/convertCompilerOptionsFromJson/Convert empty string option of libs array to compiler-options with jsonSourceFile api.js	
@@ -30,7 +30,7 @@ CompilerOptions::
   "configFilePath": "/apath/tsconfig.json"
 }
 Errors::
-tsconfig.json:8:7 - error TS6046: Argument for '--lib' option must be: 'es5', 'es6', 'es2015', 'es7', 'es2016', 'es2017', 'es2018', 'es2019', 'es2020', 'es2021', 'es2022', 'es2023', 'esnext', 'dom', 'dom.iterable', 'dom.asynciterable', 'webworker', 'webworker.importscripts', 'webworker.iterable', 'webworker.asynciterable', 'scripthost', 'es2015.core', 'es2015.collection', 'es2015.generator', 'es2015.iterable', 'es2015.promise', 'es2015.proxy', 'es2015.reflect', 'es2015.symbol', 'es2015.symbol.wellknown', 'es2016.array.include', 'es2016.intl', 'es2017.date', 'es2017.object', 'es2017.sharedmemory', 'es2017.string', 'es2017.intl', 'es2017.typedarrays', 'es2018.asyncgenerator', 'es2018.asynciterable', 'es2018.intl', 'es2018.promise', 'es2018.regexp', 'es2019.array', 'es2019.object', 'es2019.string', 'es2019.symbol', 'es2019.intl', 'es2020.bigint', 'es2020.date', 'es2020.promise', 'es2020.sharedmemory', 'es2020.string', 'es2020.symbol.wellknown', 'es2020.intl', 'es2020.number', 'es2021.promise', 'es2021.string', 'es2021.weakref', 'es2021.intl', 'es2022.array', 'es2022.error', 'es2022.intl', 'es2022.object', 'es2022.sharedmemory', 'es2022.string', 'es2022.regexp', 'es2023.array', 'es2023.collection', 'es2023.intl', 'esnext.array', 'esnext.collection', 'esnext.symbol', 'esnext.asynciterable', 'esnext.intl', 'esnext.disposable', 'esnext.bigint', 'esnext.string', 'esnext.promise', 'esnext.weakref', 'esnext.decorators', 'esnext.object', 'esnext.regexp', 'decorators', 'decorators.legacy'.
+tsconfig.json:8:7 - error TS6046: Argument for '--lib' option must be: 'es5', 'es6', 'es2015', 'es7', 'es2016', 'es2017', 'es2018', 'es2019', 'es2020', 'es2021', 'es2022', 'es2023', 'esnext', 'dom', 'dom.iterable', 'dom.asynciterable', 'webworker', 'webworker.importscripts', 'webworker.iterable', 'webworker.asynciterable', 'scripthost', 'es2015.core', 'es2015.collection', 'es2015.generator', 'es2015.iterable', 'es2015.promise', 'es2015.proxy', 'es2015.reflect', 'es2015.symbol', 'es2015.symbol.wellknown', 'es2016.array.include', 'es2016.intl', 'es2017.date', 'es2017.object', 'es2017.sharedmemory', 'es2017.string', 'es2017.intl', 'es2017.typedarrays', 'es2018.asyncgenerator', 'es2018.asynciterable', 'es2018.intl', 'es2018.promise', 'es2018.regexp', 'es2019.array', 'es2019.object', 'es2019.string', 'es2019.symbol', 'es2019.intl', 'es2020.bigint', 'es2020.date', 'es2020.promise', 'es2020.sharedmemory', 'es2020.string', 'es2020.symbol.wellknown', 'es2020.intl', 'es2020.number', 'es2021.promise', 'es2021.string', 'es2021.weakref', 'es2021.intl', 'es2022.array', 'es2022.error', 'es2022.intl', 'es2022.object', 'es2022.sharedmemory', 'es2022.string', 'es2022.regexp', 'es2023.array', 'es2023.collection', 'es2023.intl', 'esnext.array', 'esnext.collection', 'esnext.symbol', 'esnext.asynciterable', 'esnext.intl', 'esnext.disposable', 'esnext.bigint', 'esnext.string', 'esnext.promise', 'esnext.weakref', 'esnext.decorators', 'esnext.object', 'esnext.regexp', 'esnext.iterator', 'decorators', 'decorators.legacy'.
 
 8       ""
         ~~
diff --git a/tests/baselines/reference/config/convertCompilerOptionsFromJson/Convert empty string option of libs to compiler-options with json api.js b/tests/baselines/reference/config/convertCompilerOptionsFromJson/Convert empty string option of libs to compiler-options with json api.js
index 12cd9f9a69f6e..1256fcb0be357 100644
--- a/tests/baselines/reference/config/convertCompilerOptionsFromJson/Convert empty string option of libs to compiler-options with json api.js	
+++ b/tests/baselines/reference/config/convertCompilerOptionsFromJson/Convert empty string option of libs to compiler-options with json api.js	
@@ -33,5 +33,5 @@ CompilerOptions::
   "configFilePath": "/apath/tsconfig.json"
 }
 Errors::
-error TS6046: Argument for '--lib' option must be: 'es5', 'es6', 'es2015', 'es7', 'es2016', 'es2017', 'es2018', 'es2019', 'es2020', 'es2021', 'es2022', 'es2023', 'esnext', 'dom', 'dom.iterable', 'dom.asynciterable', 'webworker', 'webworker.importscripts', 'webworker.iterable', 'webworker.asynciterable', 'scripthost', 'es2015.core', 'es2015.collection', 'es2015.generator', 'es2015.iterable', 'es2015.promise', 'es2015.proxy', 'es2015.reflect', 'es2015.symbol', 'es2015.symbol.wellknown', 'es2016.array.include', 'es2016.intl', 'es2017.date', 'es2017.object', 'es2017.sharedmemory', 'es2017.string', 'es2017.intl', 'es2017.typedarrays', 'es2018.asyncgenerator', 'es2018.asynciterable', 'es2018.intl', 'es2018.promise', 'es2018.regexp', 'es2019.array', 'es2019.object', 'es2019.string', 'es2019.symbol', 'es2019.intl', 'es2020.bigint', 'es2020.date', 'es2020.promise', 'es2020.sharedmemory', 'es2020.string', 'es2020.symbol.wellknown', 'es2020.intl', 'es2020.number', 'es2021.promise', 'es2021.string', 'es2021.weakref', 'es2021.intl', 'es2022.array', 'es2022.error', 'es2022.intl', 'es2022.object', 'es2022.sharedmemory', 'es2022.string', 'es2022.regexp', 'es2023.array', 'es2023.collection', 'es2023.intl', 'esnext.array', 'esnext.collection', 'esnext.symbol', 'esnext.asynciterable', 'esnext.intl', 'esnext.disposable', 'esnext.bigint', 'esnext.string', 'esnext.promise', 'esnext.weakref', 'esnext.decorators', 'esnext.object', 'esnext.regexp', 'decorators', 'decorators.legacy'.
+error TS6046: Argument for '--lib' option must be: 'es5', 'es6', 'es2015', 'es7', 'es2016', 'es2017', 'es2018', 'es2019', 'es2020', 'es2021', 'es2022', 'es2023', 'esnext', 'dom', 'dom.iterable', 'dom.asynciterable', 'webworker', 'webworker.importscripts', 'webworker.iterable', 'webworker.asynciterable', 'scripthost', 'es2015.core', 'es2015.collection', 'es2015.generator', 'es2015.iterable', 'es2015.promise', 'es2015.proxy', 'es2015.reflect', 'es2015.symbol', 'es2015.symbol.wellknown', 'es2016.array.include', 'es2016.intl', 'es2017.date', 'es2017.object', 'es2017.sharedmemory', 'es2017.string', 'es2017.intl', 'es2017.typedarrays', 'es2018.asyncgenerator', 'es2018.asynciterable', 'es2018.intl', 'es2018.promise', 'es2018.regexp', 'es2019.array', 'es2019.object', 'es2019.string', 'es2019.symbol', 'es2019.intl', 'es2020.bigint', 'es2020.date', 'es2020.promise', 'es2020.sharedmemory', 'es2020.string', 'es2020.symbol.wellknown', 'es2020.intl', 'es2020.number', 'es2021.promise', 'es2021.string', 'es2021.weakref', 'es2021.intl', 'es2022.array', 'es2022.error', 'es2022.intl', 'es2022.object', 'es2022.sharedmemory', 'es2022.string', 'es2022.regexp', 'es2023.array', 'es2023.collection', 'es2023.intl', 'esnext.array', 'esnext.collection', 'esnext.symbol', 'esnext.asynciterable', 'esnext.intl', 'esnext.disposable', 'esnext.bigint', 'esnext.string', 'esnext.promise', 'esnext.weakref', 'esnext.decorators', 'esnext.object', 'esnext.regexp', 'esnext.iterator', 'decorators', 'decorators.legacy'.
 
diff --git a/tests/baselines/reference/config/convertCompilerOptionsFromJson/Convert empty string option of libs to compiler-options with jsonSourceFile api.js b/tests/baselines/reference/config/convertCompilerOptionsFromJson/Convert empty string option of libs to compiler-options with jsonSourceFile api.js
index b220f686852a8..db849a0aecc78 100644
--- a/tests/baselines/reference/config/convertCompilerOptionsFromJson/Convert empty string option of libs to compiler-options with jsonSourceFile api.js	
+++ b/tests/baselines/reference/config/convertCompilerOptionsFromJson/Convert empty string option of libs to compiler-options with jsonSourceFile api.js	
@@ -33,7 +33,7 @@ CompilerOptions::
   "configFilePath": "/apath/tsconfig.json"
 }
 Errors::
-tsconfig.json:9:7 - error TS6046: Argument for '--lib' option must be: 'es5', 'es6', 'es2015', 'es7', 'es2016', 'es2017', 'es2018', 'es2019', 'es2020', 'es2021', 'es2022', 'es2023', 'esnext', 'dom', 'dom.iterable', 'dom.asynciterable', 'webworker', 'webworker.importscripts', 'webworker.iterable', 'webworker.asynciterable', 'scripthost', 'es2015.core', 'es2015.collection', 'es2015.generator', 'es2015.iterable', 'es2015.promise', 'es2015.proxy', 'es2015.reflect', 'es2015.symbol', 'es2015.symbol.wellknown', 'es2016.array.include', 'es2016.intl', 'es2017.date', 'es2017.object', 'es2017.sharedmemory', 'es2017.string', 'es2017.intl', 'es2017.typedarrays', 'es2018.asyncgenerator', 'es2018.asynciterable', 'es2018.intl', 'es2018.promise', 'es2018.regexp', 'es2019.array', 'es2019.object', 'es2019.string', 'es2019.symbol', 'es2019.intl', 'es2020.bigint', 'es2020.date', 'es2020.promise', 'es2020.sharedmemory', 'es2020.string', 'es2020.symbol.wellknown', 'es2020.intl', 'es2020.number', 'es2021.promise', 'es2021.string', 'es2021.weakref', 'es2021.intl', 'es2022.array', 'es2022.error', 'es2022.intl', 'es2022.object', 'es2022.sharedmemory', 'es2022.string', 'es2022.regexp', 'es2023.array', 'es2023.collection', 'es2023.intl', 'esnext.array', 'esnext.collection', 'esnext.symbol', 'esnext.asynciterable', 'esnext.intl', 'esnext.disposable', 'esnext.bigint', 'esnext.string', 'esnext.promise', 'esnext.weakref', 'esnext.decorators', 'esnext.object', 'esnext.regexp', 'decorators', 'decorators.legacy'.
+tsconfig.json:9:7 - error TS6046: Argument for '--lib' option must be: 'es5', 'es6', 'es2015', 'es7', 'es2016', 'es2017', 'es2018', 'es2019', 'es2020', 'es2021', 'es2022', 'es2023', 'esnext', 'dom', 'dom.iterable', 'dom.asynciterable', 'webworker', 'webworker.importscripts', 'webworker.iterable', 'webworker.asynciterable', 'scripthost', 'es2015.core', 'es2015.collection', 'es2015.generator', 'es2015.iterable', 'es2015.promise', 'es2015.proxy', 'es2015.reflect', 'es2015.symbol', 'es2015.symbol.wellknown', 'es2016.array.include', 'es2016.intl', 'es2017.date', 'es2017.object', 'es2017.sharedmemory', 'es2017.string', 'es2017.intl', 'es2017.typedarrays', 'es2018.asyncgenerator', 'es2018.asynciterable', 'es2018.intl', 'es2018.promise', 'es2018.regexp', 'es2019.array', 'es2019.object', 'es2019.string', 'es2019.symbol', 'es2019.intl', 'es2020.bigint', 'es2020.date', 'es2020.promise', 'es2020.sharedmemory', 'es2020.string', 'es2020.symbol.wellknown', 'es2020.intl', 'es2020.number', 'es2021.promise', 'es2021.string', 'es2021.weakref', 'es2021.intl', 'es2022.array', 'es2022.error', 'es2022.intl', 'es2022.object', 'es2022.sharedmemory', 'es2022.string', 'es2022.regexp', 'es2023.array', 'es2023.collection', 'es2023.intl', 'esnext.array', 'esnext.collection', 'esnext.symbol', 'esnext.asynciterable', 'esnext.intl', 'esnext.disposable', 'esnext.bigint', 'esnext.string', 'esnext.promise', 'esnext.weakref', 'esnext.decorators', 'esnext.object', 'esnext.regexp', 'esnext.iterator', 'decorators', 'decorators.legacy'.
 
 9       ""
         ~~
diff --git a/tests/baselines/reference/config/convertCompilerOptionsFromJson/Convert incorrect option of libs to compiler-options with json api.js b/tests/baselines/reference/config/convertCompilerOptionsFromJson/Convert incorrect option of libs to compiler-options with json api.js
index 53df38f31b261..e1d795e42bd20 100644
--- a/tests/baselines/reference/config/convertCompilerOptionsFromJson/Convert incorrect option of libs to compiler-options with json api.js	
+++ b/tests/baselines/reference/config/convertCompilerOptionsFromJson/Convert incorrect option of libs to compiler-options with json api.js	
@@ -35,5 +35,5 @@ CompilerOptions::
   "configFilePath": "/apath/tsconfig.json"
 }
 Errors::
-error TS6046: Argument for '--lib' option must be: 'es5', 'es6', 'es2015', 'es7', 'es2016', 'es2017', 'es2018', 'es2019', 'es2020', 'es2021', 'es2022', 'es2023', 'esnext', 'dom', 'dom.iterable', 'dom.asynciterable', 'webworker', 'webworker.importscripts', 'webworker.iterable', 'webworker.asynciterable', 'scripthost', 'es2015.core', 'es2015.collection', 'es2015.generator', 'es2015.iterable', 'es2015.promise', 'es2015.proxy', 'es2015.reflect', 'es2015.symbol', 'es2015.symbol.wellknown', 'es2016.array.include', 'es2016.intl', 'es2017.date', 'es2017.object', 'es2017.sharedmemory', 'es2017.string', 'es2017.intl', 'es2017.typedarrays', 'es2018.asyncgenerator', 'es2018.asynciterable', 'es2018.intl', 'es2018.promise', 'es2018.regexp', 'es2019.array', 'es2019.object', 'es2019.string', 'es2019.symbol', 'es2019.intl', 'es2020.bigint', 'es2020.date', 'es2020.promise', 'es2020.sharedmemory', 'es2020.string', 'es2020.symbol.wellknown', 'es2020.intl', 'es2020.number', 'es2021.promise', 'es2021.string', 'es2021.weakref', 'es2021.intl', 'es2022.array', 'es2022.error', 'es2022.intl', 'es2022.object', 'es2022.sharedmemory', 'es2022.string', 'es2022.regexp', 'es2023.array', 'es2023.collection', 'es2023.intl', 'esnext.array', 'esnext.collection', 'esnext.symbol', 'esnext.asynciterable', 'esnext.intl', 'esnext.disposable', 'esnext.bigint', 'esnext.string', 'esnext.promise', 'esnext.weakref', 'esnext.decorators', 'esnext.object', 'esnext.regexp', 'decorators', 'decorators.legacy'.
+error TS6046: Argument for '--lib' option must be: 'es5', 'es6', 'es2015', 'es7', 'es2016', 'es2017', 'es2018', 'es2019', 'es2020', 'es2021', 'es2022', 'es2023', 'esnext', 'dom', 'dom.iterable', 'dom.asynciterable', 'webworker', 'webworker.importscripts', 'webworker.iterable', 'webworker.asynciterable', 'scripthost', 'es2015.core', 'es2015.collection', 'es2015.generator', 'es2015.iterable', 'es2015.promise', 'es2015.proxy', 'es2015.reflect', 'es2015.symbol', 'es2015.symbol.wellknown', 'es2016.array.include', 'es2016.intl', 'es2017.date', 'es2017.object', 'es2017.sharedmemory', 'es2017.string', 'es2017.intl', 'es2017.typedarrays', 'es2018.asyncgenerator', 'es2018.asynciterable', 'es2018.intl', 'es2018.promise', 'es2018.regexp', 'es2019.array', 'es2019.object', 'es2019.string', 'es2019.symbol', 'es2019.intl', 'es2020.bigint', 'es2020.date', 'es2020.promise', 'es2020.sharedmemory', 'es2020.string', 'es2020.symbol.wellknown', 'es2020.intl', 'es2020.number', 'es2021.promise', 'es2021.string', 'es2021.weakref', 'es2021.intl', 'es2022.array', 'es2022.error', 'es2022.intl', 'es2022.object', 'es2022.sharedmemory', 'es2022.string', 'es2022.regexp', 'es2023.array', 'es2023.collection', 'es2023.intl', 'esnext.array', 'esnext.collection', 'esnext.symbol', 'esnext.asynciterable', 'esnext.intl', 'esnext.disposable', 'esnext.bigint', 'esnext.string', 'esnext.promise', 'esnext.weakref', 'esnext.decorators', 'esnext.object', 'esnext.regexp', 'esnext.iterator', 'decorators', 'decorators.legacy'.
 
diff --git a/tests/baselines/reference/config/convertCompilerOptionsFromJson/Convert incorrect option of libs to compiler-options with jsonSourceFile api.js b/tests/baselines/reference/config/convertCompilerOptionsFromJson/Convert incorrect option of libs to compiler-options with jsonSourceFile api.js
index d528f18a59522..21f96c3a576ad 100644
--- a/tests/baselines/reference/config/convertCompilerOptionsFromJson/Convert incorrect option of libs to compiler-options with jsonSourceFile api.js	
+++ b/tests/baselines/reference/config/convertCompilerOptionsFromJson/Convert incorrect option of libs to compiler-options with jsonSourceFile api.js	
@@ -35,7 +35,7 @@ CompilerOptions::
   "configFilePath": "/apath/tsconfig.json"
 }
 Errors::
-tsconfig.json:10:7 - error TS6046: Argument for '--lib' option must be: 'es5', 'es6', 'es2015', 'es7', 'es2016', 'es2017', 'es2018', 'es2019', 'es2020', 'es2021', 'es2022', 'es2023', 'esnext', 'dom', 'dom.iterable', 'dom.asynciterable', 'webworker', 'webworker.importscripts', 'webworker.iterable', 'webworker.asynciterable', 'scripthost', 'es2015.core', 'es2015.collection', 'es2015.generator', 'es2015.iterable', 'es2015.promise', 'es2015.proxy', 'es2015.reflect', 'es2015.symbol', 'es2015.symbol.wellknown', 'es2016.array.include', 'es2016.intl', 'es2017.date', 'es2017.object', 'es2017.sharedmemory', 'es2017.string', 'es2017.intl', 'es2017.typedarrays', 'es2018.asyncgenerator', 'es2018.asynciterable', 'es2018.intl', 'es2018.promise', 'es2018.regexp', 'es2019.array', 'es2019.object', 'es2019.string', 'es2019.symbol', 'es2019.intl', 'es2020.bigint', 'es2020.date', 'es2020.promise', 'es2020.sharedmemory', 'es2020.string', 'es2020.symbol.wellknown', 'es2020.intl', 'es2020.number', 'es2021.promise', 'es2021.string', 'es2021.weakref', 'es2021.intl', 'es2022.array', 'es2022.error', 'es2022.intl', 'es2022.object', 'es2022.sharedmemory', 'es2022.string', 'es2022.regexp', 'es2023.array', 'es2023.collection', 'es2023.intl', 'esnext.array', 'esnext.collection', 'esnext.symbol', 'esnext.asynciterable', 'esnext.intl', 'esnext.disposable', 'esnext.bigint', 'esnext.string', 'esnext.promise', 'esnext.weakref', 'esnext.decorators', 'esnext.object', 'esnext.regexp', 'decorators', 'decorators.legacy'.
+tsconfig.json:10:7 - error TS6046: Argument for '--lib' option must be: 'es5', 'es6', 'es2015', 'es7', 'es2016', 'es2017', 'es2018', 'es2019', 'es2020', 'es2021', 'es2022', 'es2023', 'esnext', 'dom', 'dom.iterable', 'dom.asynciterable', 'webworker', 'webworker.importscripts', 'webworker.iterable', 'webworker.asynciterable', 'scripthost', 'es2015.core', 'es2015.collection', 'es2015.generator', 'es2015.iterable', 'es2015.promise', 'es2015.proxy', 'es2015.reflect', 'es2015.symbol', 'es2015.symbol.wellknown', 'es2016.array.include', 'es2016.intl', 'es2017.date', 'es2017.object', 'es2017.sharedmemory', 'es2017.string', 'es2017.intl', 'es2017.typedarrays', 'es2018.asyncgenerator', 'es2018.asynciterable', 'es2018.intl', 'es2018.promise', 'es2018.regexp', 'es2019.array', 'es2019.object', 'es2019.string', 'es2019.symbol', 'es2019.intl', 'es2020.bigint', 'es2020.date', 'es2020.promise', 'es2020.sharedmemory', 'es2020.string', 'es2020.symbol.wellknown', 'es2020.intl', 'es2020.number', 'es2021.promise', 'es2021.string', 'es2021.weakref', 'es2021.intl', 'es2022.array', 'es2022.error', 'es2022.intl', 'es2022.object', 'es2022.sharedmemory', 'es2022.string', 'es2022.regexp', 'es2023.array', 'es2023.collection', 'es2023.intl', 'esnext.array', 'esnext.collection', 'esnext.symbol', 'esnext.asynciterable', 'esnext.intl', 'esnext.disposable', 'esnext.bigint', 'esnext.string', 'esnext.promise', 'esnext.weakref', 'esnext.decorators', 'esnext.object', 'esnext.regexp', 'esnext.iterator', 'decorators', 'decorators.legacy'.
 
 10       "incorrectLib"
          ~~~~~~~~~~~~~~
diff --git a/tests/baselines/reference/config/convertCompilerOptionsFromJson/Convert trailing-whitespace string option of libs to compiler-options with json api.js b/tests/baselines/reference/config/convertCompilerOptionsFromJson/Convert trailing-whitespace string option of libs to compiler-options with json api.js
index 910344faabca5..b4f79a2e2c1f5 100644
--- a/tests/baselines/reference/config/convertCompilerOptionsFromJson/Convert trailing-whitespace string option of libs to compiler-options with json api.js	
+++ b/tests/baselines/reference/config/convertCompilerOptionsFromJson/Convert trailing-whitespace string option of libs to compiler-options with json api.js	
@@ -30,5 +30,5 @@ CompilerOptions::
   "configFilePath": "/apath/tsconfig.json"
 }
 Errors::
-error TS6046: Argument for '--lib' option must be: 'es5', 'es6', 'es2015', 'es7', 'es2016', 'es2017', 'es2018', 'es2019', 'es2020', 'es2021', 'es2022', 'es2023', 'esnext', 'dom', 'dom.iterable', 'dom.asynciterable', 'webworker', 'webworker.importscripts', 'webworker.iterable', 'webworker.asynciterable', 'scripthost', 'es2015.core', 'es2015.collection', 'es2015.generator', 'es2015.iterable', 'es2015.promise', 'es2015.proxy', 'es2015.reflect', 'es2015.symbol', 'es2015.symbol.wellknown', 'es2016.array.include', 'es2016.intl', 'es2017.date', 'es2017.object', 'es2017.sharedmemory', 'es2017.string', 'es2017.intl', 'es2017.typedarrays', 'es2018.asyncgenerator', 'es2018.asynciterable', 'es2018.intl', 'es2018.promise', 'es2018.regexp', 'es2019.array', 'es2019.object', 'es2019.string', 'es2019.symbol', 'es2019.intl', 'es2020.bigint', 'es2020.date', 'es2020.promise', 'es2020.sharedmemory', 'es2020.string', 'es2020.symbol.wellknown', 'es2020.intl', 'es2020.number', 'es2021.promise', 'es2021.string', 'es2021.weakref', 'es2021.intl', 'es2022.array', 'es2022.error', 'es2022.intl', 'es2022.object', 'es2022.sharedmemory', 'es2022.string', 'es2022.regexp', 'es2023.array', 'es2023.collection', 'es2023.intl', 'esnext.array', 'esnext.collection', 'esnext.symbol', 'esnext.asynciterable', 'esnext.intl', 'esnext.disposable', 'esnext.bigint', 'esnext.string', 'esnext.promise', 'esnext.weakref', 'esnext.decorators', 'esnext.object', 'esnext.regexp', 'decorators', 'decorators.legacy'.
+error TS6046: Argument for '--lib' option must be: 'es5', 'es6', 'es2015', 'es7', 'es2016', 'es2017', 'es2018', 'es2019', 'es2020', 'es2021', 'es2022', 'es2023', 'esnext', 'dom', 'dom.iterable', 'dom.asynciterable', 'webworker', 'webworker.importscripts', 'webworker.iterable', 'webworker.asynciterable', 'scripthost', 'es2015.core', 'es2015.collection', 'es2015.generator', 'es2015.iterable', 'es2015.promise', 'es2015.proxy', 'es2015.reflect', 'es2015.symbol', 'es2015.symbol.wellknown', 'es2016.array.include', 'es2016.intl', 'es2017.date', 'es2017.object', 'es2017.sharedmemory', 'es2017.string', 'es2017.intl', 'es2017.typedarrays', 'es2018.asyncgenerator', 'es2018.asynciterable', 'es2018.intl', 'es2018.promise', 'es2018.regexp', 'es2019.array', 'es2019.object', 'es2019.string', 'es2019.symbol', 'es2019.intl', 'es2020.bigint', 'es2020.date', 'es2020.promise', 'es2020.sharedmemory', 'es2020.string', 'es2020.symbol.wellknown', 'es2020.intl', 'es2020.number', 'es2021.promise', 'es2021.string', 'es2021.weakref', 'es2021.intl', 'es2022.array', 'es2022.error', 'es2022.intl', 'es2022.object', 'es2022.sharedmemory', 'es2022.string', 'es2022.regexp', 'es2023.array', 'es2023.collection', 'es2023.intl', 'esnext.array', 'esnext.collection', 'esnext.symbol', 'esnext.asynciterable', 'esnext.intl', 'esnext.disposable', 'esnext.bigint', 'esnext.string', 'esnext.promise', 'esnext.weakref', 'esnext.decorators', 'esnext.object', 'esnext.regexp', 'esnext.iterator', 'decorators', 'decorators.legacy'.
 
diff --git a/tests/baselines/reference/config/convertCompilerOptionsFromJson/Convert trailing-whitespace string option of libs to compiler-options with jsonSourceFile api.js b/tests/baselines/reference/config/convertCompilerOptionsFromJson/Convert trailing-whitespace string option of libs to compiler-options with jsonSourceFile api.js
index 0878868862dc7..8c18f04855e76 100644
--- a/tests/baselines/reference/config/convertCompilerOptionsFromJson/Convert trailing-whitespace string option of libs to compiler-options with jsonSourceFile api.js	
+++ b/tests/baselines/reference/config/convertCompilerOptionsFromJson/Convert trailing-whitespace string option of libs to compiler-options with jsonSourceFile api.js	
@@ -30,7 +30,7 @@ CompilerOptions::
   "configFilePath": "/apath/tsconfig.json"
 }
 Errors::
-tsconfig.json:8:7 - error TS6046: Argument for '--lib' option must be: 'es5', 'es6', 'es2015', 'es7', 'es2016', 'es2017', 'es2018', 'es2019', 'es2020', 'es2021', 'es2022', 'es2023', 'esnext', 'dom', 'dom.iterable', 'dom.asynciterable', 'webworker', 'webworker.importscripts', 'webworker.iterable', 'webworker.asynciterable', 'scripthost', 'es2015.core', 'es2015.collection', 'es2015.generator', 'es2015.iterable', 'es2015.promise', 'es2015.proxy', 'es2015.reflect', 'es2015.symbol', 'es2015.symbol.wellknown', 'es2016.array.include', 'es2016.intl', 'es2017.date', 'es2017.object', 'es2017.sharedmemory', 'es2017.string', 'es2017.intl', 'es2017.typedarrays', 'es2018.asyncgenerator', 'es2018.asynciterable', 'es2018.intl', 'es2018.promise', 'es2018.regexp', 'es2019.array', 'es2019.object', 'es2019.string', 'es2019.symbol', 'es2019.intl', 'es2020.bigint', 'es2020.date', 'es2020.promise', 'es2020.sharedmemory', 'es2020.string', 'es2020.symbol.wellknown', 'es2020.intl', 'es2020.number', 'es2021.promise', 'es2021.string', 'es2021.weakref', 'es2021.intl', 'es2022.array', 'es2022.error', 'es2022.intl', 'es2022.object', 'es2022.sharedmemory', 'es2022.string', 'es2022.regexp', 'es2023.array', 'es2023.collection', 'es2023.intl', 'esnext.array', 'esnext.collection', 'esnext.symbol', 'esnext.asynciterable', 'esnext.intl', 'esnext.disposable', 'esnext.bigint', 'esnext.string', 'esnext.promise', 'esnext.weakref', 'esnext.decorators', 'esnext.object', 'esnext.regexp', 'decorators', 'decorators.legacy'.
+tsconfig.json:8:7 - error TS6046: Argument for '--lib' option must be: 'es5', 'es6', 'es2015', 'es7', 'es2016', 'es2017', 'es2018', 'es2019', 'es2020', 'es2021', 'es2022', 'es2023', 'esnext', 'dom', 'dom.iterable', 'dom.asynciterable', 'webworker', 'webworker.importscripts', 'webworker.iterable', 'webworker.asynciterable', 'scripthost', 'es2015.core', 'es2015.collection', 'es2015.generator', 'es2015.iterable', 'es2015.promise', 'es2015.proxy', 'es2015.reflect', 'es2015.symbol', 'es2015.symbol.wellknown', 'es2016.array.include', 'es2016.intl', 'es2017.date', 'es2017.object', 'es2017.sharedmemory', 'es2017.string', 'es2017.intl', 'es2017.typedarrays', 'es2018.asyncgenerator', 'es2018.asynciterable', 'es2018.intl', 'es2018.promise', 'es2018.regexp', 'es2019.array', 'es2019.object', 'es2019.string', 'es2019.symbol', 'es2019.intl', 'es2020.bigint', 'es2020.date', 'es2020.promise', 'es2020.sharedmemory', 'es2020.string', 'es2020.symbol.wellknown', 'es2020.intl', 'es2020.number', 'es2021.promise', 'es2021.string', 'es2021.weakref', 'es2021.intl', 'es2022.array', 'es2022.error', 'es2022.intl', 'es2022.object', 'es2022.sharedmemory', 'es2022.string', 'es2022.regexp', 'es2023.array', 'es2023.collection', 'es2023.intl', 'esnext.array', 'esnext.collection', 'esnext.symbol', 'esnext.asynciterable', 'esnext.intl', 'esnext.disposable', 'esnext.bigint', 'esnext.string', 'esnext.promise', 'esnext.weakref', 'esnext.decorators', 'esnext.object', 'esnext.regexp', 'esnext.iterator', 'decorators', 'decorators.legacy'.
 
 8       "   "
         ~~~~~
diff --git a/tests/baselines/reference/contextuallyTypeGeneratorReturnTypeFromUnion.symbols b/tests/baselines/reference/contextuallyTypeGeneratorReturnTypeFromUnion.symbols
index f1cb7ae700245..e6777b2b2eeb1 100644
--- a/tests/baselines/reference/contextuallyTypeGeneratorReturnTypeFromUnion.symbols
+++ b/tests/baselines/reference/contextuallyTypeGeneratorReturnTypeFromUnion.symbols
@@ -5,7 +5,7 @@
 
 type Action = () => (Generator<string, string, string[]> | string)
 >Action : Symbol(Action, Decl(contextuallyTypeGeneratorReturnTypeFromUnion.ts, 0, 0))
->Generator : Symbol(Generator, Decl(lib.es2015.generator.d.ts, --, --))
+>Generator : Symbol(Generator, Decl(lib.es2015.generator.d.ts, --, --), Decl(lib.esnext.iterator.d.ts, --, --))
 
 const test1: Action = function* () {
 >test1 : Symbol(test1, Decl(contextuallyTypeGeneratorReturnTypeFromUnion.ts, 4, 5))
diff --git a/tests/baselines/reference/dependentDestructuredVariables.symbols b/tests/baselines/reference/dependentDestructuredVariables.symbols
index ae71b255d1a88..b89295307c2f4 100644
--- a/tests/baselines/reference/dependentDestructuredVariables.symbols
+++ b/tests/baselines/reference/dependentDestructuredVariables.symbols
@@ -380,7 +380,7 @@ interface B<T> { variant: 'b', value: Array<T> }
 >T : Symbol(T, Decl(dependentDestructuredVariables.ts, 148, 12))
 >variant : Symbol(B.variant, Decl(dependentDestructuredVariables.ts, 148, 16))
 >value : Symbol(B.value, Decl(dependentDestructuredVariables.ts, 148, 30))
->Array : Symbol(Array, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.symbol.wellknown.d.ts, --, --) ... and 4 more)
+>Array : Symbol(Array, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.symbol.wellknown.d.ts, --, --) ... and 5 more)
 >T : Symbol(T, Decl(dependentDestructuredVariables.ts, 148, 12))
 
 type AB<T> = A<T> | B<T>;
@@ -401,7 +401,7 @@ declare function printValueList<T>(t: Array<T>): void;
 >printValueList : Symbol(printValueList, Decl(dependentDestructuredVariables.ts, 152, 43))
 >T : Symbol(T, Decl(dependentDestructuredVariables.ts, 154, 32))
 >t : Symbol(t, Decl(dependentDestructuredVariables.ts, 154, 35))
->Array : Symbol(Array, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.symbol.wellknown.d.ts, --, --) ... and 4 more)
+>Array : Symbol(Array, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.symbol.wellknown.d.ts, --, --) ... and 5 more)
 >T : Symbol(T, Decl(dependentDestructuredVariables.ts, 154, 32))
 
 function unrefined1<T>(ab: AB<T>): void {
@@ -477,7 +477,7 @@ const reducerBroken = (state: number, { type, payload }: Action3) => {
 
 declare var it: Iterator<number>;
 >it : Symbol(it, Decl(dependentDestructuredVariables.ts, 183, 11))
->Iterator : Symbol(Iterator, Decl(lib.es2015.iterable.d.ts, --, --))
+>Iterator : Symbol(Iterator, Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.esnext.iterator.d.ts, --, --))
 
 const { value, done } = it.next();
 >value : Symbol(value, Decl(dependentDestructuredVariables.ts, 184, 7))
@@ -747,7 +747,7 @@ type FooGenMethod = {
 >e : Symbol(e, Decl(dependentDestructuredVariables.ts, 286, 23))
 
   ): Generator<any, any, any>;
->Generator : Symbol(Generator, Decl(lib.es2015.generator.d.ts, --, --))
+>Generator : Symbol(Generator, Decl(lib.es2015.generator.d.ts, --, --), Decl(lib.esnext.iterator.d.ts, --, --))
 }
 
 let fooGenM: FooGenMethod = {
diff --git a/tests/baselines/reference/dependentDestructuredVariables.types b/tests/baselines/reference/dependentDestructuredVariables.types
index 9591df821a053..23830ab53191b 100644
--- a/tests/baselines/reference/dependentDestructuredVariables.types
+++ b/tests/baselines/reference/dependentDestructuredVariables.types
@@ -2,7 +2,7 @@
 
 === Performance Stats ===
 Type Count: 2,500
-Instantiation count: 1,000
+Instantiation count: 2,500
 
 === dependentDestructuredVariables.ts ===
 type Action =
diff --git a/tests/baselines/reference/dependentDestructuredVariablesFromNestedPatterns.types b/tests/baselines/reference/dependentDestructuredVariablesFromNestedPatterns.types
index 562ada922367b..798411ef7ec3d 100644
--- a/tests/baselines/reference/dependentDestructuredVariablesFromNestedPatterns.types
+++ b/tests/baselines/reference/dependentDestructuredVariablesFromNestedPatterns.types
@@ -60,11 +60,11 @@ async function myAllSettled<T extends readonly unknown[]>(fn: () => T) {
 >                               :   ^                                                               
 >Promise.allSettled(fn()) : Promise<{ -readonly [P in keyof T]: PromiseSettledResult<Awaited<T[P]>>; }>
 >                         : ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
->Promise.allSettled : { <T_1 extends readonly unknown[] | []>(values: T_1): Promise<{ -readonly [P in keyof T_1]: PromiseSettledResult<Awaited<T_1[P]>>; }>; <T_2>(values: Iterable<T_2 | PromiseLike<T_2>>): Promise<PromiseSettledResult<Awaited<T_2>>[]>; }
+>Promise.allSettled : { <T_1 extends [] | readonly unknown[]>(values: T_1): Promise<{ -readonly [P in keyof T_1]: PromiseSettledResult<Awaited<T_1[P]>>; }>; <T_2>(values: Iterable<T_2 | PromiseLike<T_2>>): Promise<PromiseSettledResult<Awaited<T_2>>[]>; }
 >                   : ^^^   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^      ^^   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^   ^^      ^^                                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 >Promise : PromiseConstructor
 >        : ^^^^^^^^^^^^^^^^^^
->allSettled : { <T_1 extends readonly unknown[] | []>(values: T_1): Promise<{ -readonly [P in keyof T_1]: PromiseSettledResult<Awaited<T_1[P]>>; }>; <T_2>(values: Iterable<T_2 | PromiseLike<T_2>>): Promise<PromiseSettledResult<Awaited<T_2>>[]>; }
+>allSettled : { <T_1 extends [] | readonly unknown[]>(values: T_1): Promise<{ -readonly [P in keyof T_1]: PromiseSettledResult<Awaited<T_1[P]>>; }>; <T_2>(values: Iterable<T_2 | PromiseLike<T_2>>): Promise<PromiseSettledResult<Awaited<T_2>>[]>; }
 >           : ^^^   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^      ^^   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^   ^^      ^^                                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 >fn() : T
 >     : ^
diff --git a/tests/baselines/reference/esNextWeakRefs_IterableWeakMap.symbols b/tests/baselines/reference/esNextWeakRefs_IterableWeakMap.symbols
index 5af85b38568d1..722d7bb690d9b 100644
--- a/tests/baselines/reference/esNextWeakRefs_IterableWeakMap.symbols
+++ b/tests/baselines/reference/esNextWeakRefs_IterableWeakMap.symbols
@@ -239,7 +239,7 @@ export class IterableWeakMap<K extends object, V> implements WeakMap<K, V> {
 
     *entries(): Generator<[key: K, value: V], void> {
 >entries : Symbol(IterableWeakMap.entries, Decl(esNextWeakRefs_IterableWeakMap.ts, 62, 47))
->Generator : Symbol(Generator, Decl(lib.es2015.generator.d.ts, --, --))
+>Generator : Symbol(Generator, Decl(lib.es2015.generator.d.ts, --, --), Decl(lib.esnext.iterator.d.ts, --, --))
 >K : Symbol(K, Decl(esNextWeakRefs_IterableWeakMap.ts, 9, 29))
 >V : Symbol(V, Decl(esNextWeakRefs_IterableWeakMap.ts, 9, 46))
 
diff --git a/tests/baselines/reference/flatArrayNoExcessiveStackDepth.symbols b/tests/baselines/reference/flatArrayNoExcessiveStackDepth.symbols
index 839a089eac091..aee177c3e7005 100644
--- a/tests/baselines/reference/flatArrayNoExcessiveStackDepth.symbols
+++ b/tests/baselines/reference/flatArrayNoExcessiveStackDepth.symbols
@@ -17,7 +17,7 @@ const bar = foo.flatMap(bar => bar as Foo);
 
 interface Foo extends Array<string> {}
 >Foo : Symbol(Foo, Decl(flatArrayNoExcessiveStackDepth.ts, 3, 43))
->Array : Symbol(Array, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.symbol.wellknown.d.ts, --, --) ... and 4 more)
+>Array : Symbol(Array, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.symbol.wellknown.d.ts, --, --) ... and 5 more)
 
 // Repros from comments in #43249
 
diff --git a/tests/baselines/reference/generatorAssignability.symbols b/tests/baselines/reference/generatorAssignability.symbols
index 78b8c6d36a427..c72f31ddbac9c 100644
--- a/tests/baselines/reference/generatorAssignability.symbols
+++ b/tests/baselines/reference/generatorAssignability.symbols
@@ -6,15 +6,15 @@ declare let _: any;
 
 declare const g1: Generator<number, void, string>;
 >g1 : Symbol(g1, Decl(generatorAssignability.ts, 1, 13))
->Generator : Symbol(Generator, Decl(lib.es2015.generator.d.ts, --, --))
+>Generator : Symbol(Generator, Decl(lib.es2015.generator.d.ts, --, --), Decl(lib.esnext.iterator.d.ts, --, --))
 
 declare const g2: Generator<number, void, undefined>;
 >g2 : Symbol(g2, Decl(generatorAssignability.ts, 2, 13))
->Generator : Symbol(Generator, Decl(lib.es2015.generator.d.ts, --, --))
+>Generator : Symbol(Generator, Decl(lib.es2015.generator.d.ts, --, --), Decl(lib.esnext.iterator.d.ts, --, --))
 
 declare const g3: Generator<number, void, boolean>;
 >g3 : Symbol(g3, Decl(generatorAssignability.ts, 3, 13))
->Generator : Symbol(Generator, Decl(lib.es2015.generator.d.ts, --, --))
+>Generator : Symbol(Generator, Decl(lib.es2015.generator.d.ts, --, --), Decl(lib.esnext.iterator.d.ts, --, --))
 
 declare const g4: AsyncGenerator<number, void, string>;
 >g4 : Symbol(g4, Decl(generatorAssignability.ts, 4, 13))
@@ -104,7 +104,7 @@ async function asyncfn() {
 
 function* f1(): Generator<number, void, boolean> {
 >f1 : Symbol(f1, Decl(generatorAssignability.ts, 40, 1))
->Generator : Symbol(Generator, Decl(lib.es2015.generator.d.ts, --, --))
+>Generator : Symbol(Generator, Decl(lib.es2015.generator.d.ts, --, --), Decl(lib.esnext.iterator.d.ts, --, --))
 
     // yield* over iterable
     yield* g1; // error
diff --git a/tests/baselines/reference/generatorExplicitReturnType.symbols b/tests/baselines/reference/generatorExplicitReturnType.symbols
index 3b4841c78016c..a52d505506220 100644
--- a/tests/baselines/reference/generatorExplicitReturnType.symbols
+++ b/tests/baselines/reference/generatorExplicitReturnType.symbols
@@ -3,7 +3,7 @@
 === generatorExplicitReturnType.ts ===
 function* g1(): Generator<number, boolean, string> {
 >g1 : Symbol(g1, Decl(generatorExplicitReturnType.ts, 0, 0))
->Generator : Symbol(Generator, Decl(lib.es2015.generator.d.ts, --, --))
+>Generator : Symbol(Generator, Decl(lib.es2015.generator.d.ts, --, --), Decl(lib.esnext.iterator.d.ts, --, --))
 
     yield; // error
     yield "a"; // error
@@ -15,7 +15,7 @@ function* g1(): Generator<number, boolean, string> {
 
 function* g2(): Generator<number, boolean, string> {
 >g2 : Symbol(g2, Decl(generatorExplicitReturnType.ts, 5, 1))
->Generator : Symbol(Generator, Decl(lib.es2015.generator.d.ts, --, --))
+>Generator : Symbol(Generator, Decl(lib.es2015.generator.d.ts, --, --), Decl(lib.esnext.iterator.d.ts, --, --))
 
     const x = yield 1;
 >x : Symbol(x, Decl(generatorExplicitReturnType.ts, 8, 9))
@@ -25,11 +25,11 @@ function* g2(): Generator<number, boolean, string> {
 
 declare const generator: Generator<number, symbol, string>;
 >generator : Symbol(generator, Decl(generatorExplicitReturnType.ts, 12, 13))
->Generator : Symbol(Generator, Decl(lib.es2015.generator.d.ts, --, --))
+>Generator : Symbol(Generator, Decl(lib.es2015.generator.d.ts, --, --), Decl(lib.esnext.iterator.d.ts, --, --))
 
 function* g3(): Generator<number, boolean, string> {
 >g3 : Symbol(g3, Decl(generatorExplicitReturnType.ts, 12, 59))
->Generator : Symbol(Generator, Decl(lib.es2015.generator.d.ts, --, --))
+>Generator : Symbol(Generator, Decl(lib.es2015.generator.d.ts, --, --), Decl(lib.esnext.iterator.d.ts, --, --))
 
     const x: number = yield* generator; // error
 >x : Symbol(x, Decl(generatorExplicitReturnType.ts, 15, 9))
@@ -40,7 +40,7 @@ function* g3(): Generator<number, boolean, string> {
 
 function* g4(): Generator<number, boolean, string> {
 >g4 : Symbol(g4, Decl(generatorExplicitReturnType.ts, 17, 1))
->Generator : Symbol(Generator, Decl(lib.es2015.generator.d.ts, --, --))
+>Generator : Symbol(Generator, Decl(lib.es2015.generator.d.ts, --, --), Decl(lib.esnext.iterator.d.ts, --, --))
 
     const x = yield* generator;
 >x : Symbol(x, Decl(generatorExplicitReturnType.ts, 20, 9))
diff --git a/tests/baselines/reference/generatorReturnContextualType.symbols b/tests/baselines/reference/generatorReturnContextualType.symbols
index 276b6fd013a71..1e410d873a32b 100644
--- a/tests/baselines/reference/generatorReturnContextualType.symbols
+++ b/tests/baselines/reference/generatorReturnContextualType.symbols
@@ -5,7 +5,7 @@
 
 function* f1(): Generator<any, { x: 'x' }, any> {
 >f1 : Symbol(f1, Decl(generatorReturnContextualType.ts, 0, 0))
->Generator : Symbol(Generator, Decl(lib.es2015.generator.d.ts, --, --))
+>Generator : Symbol(Generator, Decl(lib.es2015.generator.d.ts, --, --), Decl(lib.esnext.iterator.d.ts, --, --))
 >x : Symbol(x, Decl(generatorReturnContextualType.ts, 2, 32))
 
   return { x: 'x' };
@@ -14,7 +14,7 @@ function* f1(): Generator<any, { x: 'x' }, any> {
 
 function* g1(): Iterator<any, { x: 'x' }, any> {
 >g1 : Symbol(g1, Decl(generatorReturnContextualType.ts, 4, 1))
->Iterator : Symbol(Iterator, Decl(lib.es2015.iterable.d.ts, --, --))
+>Iterator : Symbol(Iterator, Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.esnext.iterator.d.ts, --, --))
 >x : Symbol(x, Decl(generatorReturnContextualType.ts, 6, 31))
 
   return { x: 'x' };
diff --git a/tests/baselines/reference/generatorReturnExpressionIsChecked.symbols b/tests/baselines/reference/generatorReturnExpressionIsChecked.symbols
index 6366a75725618..976b4c3114ded 100644
--- a/tests/baselines/reference/generatorReturnExpressionIsChecked.symbols
+++ b/tests/baselines/reference/generatorReturnExpressionIsChecked.symbols
@@ -3,7 +3,7 @@
 === generatorReturnExpressionIsChecked.ts ===
 function* f(): Iterator<number> {
 >f : Symbol(f, Decl(generatorReturnExpressionIsChecked.ts, 0, 0))
->Iterator : Symbol(Iterator, Decl(lib.es2015.iterable.d.ts, --, --))
+>Iterator : Symbol(Iterator, Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.esnext.iterator.d.ts, --, --))
 
     return invalid;
 }
diff --git a/tests/baselines/reference/generatorReturnTypeIndirectReferenceToGlobalType.symbols b/tests/baselines/reference/generatorReturnTypeIndirectReferenceToGlobalType.symbols
index 555b7048d4104..a4fae06f89977 100644
--- a/tests/baselines/reference/generatorReturnTypeIndirectReferenceToGlobalType.symbols
+++ b/tests/baselines/reference/generatorReturnTypeIndirectReferenceToGlobalType.symbols
@@ -3,7 +3,7 @@
 === generatorReturnTypeIndirectReferenceToGlobalType.ts ===
 interface I1 extends Iterator<0, 1, 2> {}
 >I1 : Symbol(I1, Decl(generatorReturnTypeIndirectReferenceToGlobalType.ts, 0, 0))
->Iterator : Symbol(Iterator, Decl(lib.es2015.iterable.d.ts, --, --))
+>Iterator : Symbol(Iterator, Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.esnext.iterator.d.ts, --, --))
 
 function* f1(): I1 {
 >f1 : Symbol(f1, Decl(generatorReturnTypeIndirectReferenceToGlobalType.ts, 0, 41))
diff --git a/tests/baselines/reference/generatorReturnTypeInference.symbols b/tests/baselines/reference/generatorReturnTypeInference.symbols
index 3e1de94f089af..c15a248dfaaf7 100644
--- a/tests/baselines/reference/generatorReturnTypeInference.symbols
+++ b/tests/baselines/reference/generatorReturnTypeInference.symbols
@@ -7,7 +7,7 @@ declare const iterableIterator: IterableIterator<number>;
 
 declare const generator: Generator<number, string, boolean>;
 >generator : Symbol(generator, Decl(generatorReturnTypeInference.ts, 1, 13))
->Generator : Symbol(Generator, Decl(lib.es2015.generator.d.ts, --, --))
+>Generator : Symbol(Generator, Decl(lib.es2015.generator.d.ts, --, --), Decl(lib.esnext.iterator.d.ts, --, --))
 
 declare const never: never;
 >never : Symbol(never, Decl(generatorReturnTypeInference.ts, 2, 13))
diff --git a/tests/baselines/reference/generatorReturnTypeInferenceNonStrict.symbols b/tests/baselines/reference/generatorReturnTypeInferenceNonStrict.symbols
index 321aad62001a3..92808d7bce940 100644
--- a/tests/baselines/reference/generatorReturnTypeInferenceNonStrict.symbols
+++ b/tests/baselines/reference/generatorReturnTypeInferenceNonStrict.symbols
@@ -7,7 +7,7 @@ declare const iterableIterator: IterableIterator<number>;
 
 declare const generator: Generator<number, string, boolean>;
 >generator : Symbol(generator, Decl(generatorReturnTypeInferenceNonStrict.ts, 1, 13))
->Generator : Symbol(Generator, Decl(lib.es2015.generator.d.ts, --, --))
+>Generator : Symbol(Generator, Decl(lib.es2015.generator.d.ts, --, --), Decl(lib.esnext.iterator.d.ts, --, --))
 
 declare const never: never;
 >never : Symbol(never, Decl(generatorReturnTypeInferenceNonStrict.ts, 2, 13))
diff --git a/tests/baselines/reference/generatorYieldContextualType.symbols b/tests/baselines/reference/generatorYieldContextualType.symbols
index 364a96d995e29..0c84ed7ec3458 100644
--- a/tests/baselines/reference/generatorYieldContextualType.symbols
+++ b/tests/baselines/reference/generatorYieldContextualType.symbols
@@ -7,7 +7,7 @@ declare function f1<T, R, S>(gen: () => Generator<R, T, S>): void;
 >R : Symbol(R, Decl(generatorYieldContextualType.ts, 0, 22))
 >S : Symbol(S, Decl(generatorYieldContextualType.ts, 0, 25))
 >gen : Symbol(gen, Decl(generatorYieldContextualType.ts, 0, 29))
->Generator : Symbol(Generator, Decl(lib.es2015.generator.d.ts, --, --))
+>Generator : Symbol(Generator, Decl(lib.es2015.generator.d.ts, --, --), Decl(lib.esnext.iterator.d.ts, --, --))
 >R : Symbol(R, Decl(generatorYieldContextualType.ts, 0, 22))
 >T : Symbol(T, Decl(generatorYieldContextualType.ts, 0, 20))
 >S : Symbol(S, Decl(generatorYieldContextualType.ts, 0, 25))
@@ -27,7 +27,7 @@ declare function f2<T, R, S>(gen: () => Generator<R, T, S> | AsyncGenerator<R, T
 >R : Symbol(R, Decl(generatorYieldContextualType.ts, 6, 22))
 >S : Symbol(S, Decl(generatorYieldContextualType.ts, 6, 25))
 >gen : Symbol(gen, Decl(generatorYieldContextualType.ts, 6, 29))
->Generator : Symbol(Generator, Decl(lib.es2015.generator.d.ts, --, --))
+>Generator : Symbol(Generator, Decl(lib.es2015.generator.d.ts, --, --), Decl(lib.esnext.iterator.d.ts, --, --))
 >R : Symbol(R, Decl(generatorYieldContextualType.ts, 6, 22))
 >T : Symbol(T, Decl(generatorYieldContextualType.ts, 6, 20))
 >S : Symbol(S, Decl(generatorYieldContextualType.ts, 6, 25))
@@ -130,7 +130,7 @@ type StepGenerator =
 >StepGenerator : Symbol(StepGenerator, Decl(generatorYieldContextualType.ts, 43, 1))
 
   | Generator<
->Generator : Symbol(Generator, Decl(lib.es2015.generator.d.ts, --, --))
+>Generator : Symbol(Generator, Decl(lib.es2015.generator.d.ts, --, --), Decl(lib.esnext.iterator.d.ts, --, --))
 
       QuickPickStep | QuickInputStep,
 >QuickPickStep : Symbol(QuickPickStep, Decl(generatorYieldContextualType.ts, 38, 1))
@@ -190,7 +190,7 @@ type StepResultGenerator<T> =
 >T : Symbol(T, Decl(generatorYieldContextualType.ts, 66, 25))
 
   | Generator<QuickPickStep | QuickInputStep, StepResult<T>, any | undefined>
->Generator : Symbol(Generator, Decl(lib.es2015.generator.d.ts, --, --))
+>Generator : Symbol(Generator, Decl(lib.es2015.generator.d.ts, --, --), Decl(lib.esnext.iterator.d.ts, --, --))
 >QuickPickStep : Symbol(QuickPickStep, Decl(generatorYieldContextualType.ts, 38, 1))
 >QuickInputStep : Symbol(QuickInputStep, Decl(generatorYieldContextualType.ts, 32, 1))
 >StepResult : Symbol(StepResult, Decl(generatorYieldContextualType.ts, 61, 10), Decl(generatorYieldContextualType.ts, 64, 1))
diff --git a/tests/baselines/reference/generatorYieldContextualType.types b/tests/baselines/reference/generatorYieldContextualType.types
index 1619affc92ccb..cc567327b95ac 100644
--- a/tests/baselines/reference/generatorYieldContextualType.types
+++ b/tests/baselines/reference/generatorYieldContextualType.types
@@ -1,5 +1,8 @@
 //// [tests/cases/conformance/generators/generatorYieldContextualType.ts] ////
 
+=== Performance Stats ===
+Type Count: 1,000
+
 === generatorYieldContextualType.ts ===
 declare function f1<T, R, S>(gen: () => Generator<R, T, S>): void;
 >f1 : <T, R, S>(gen: () => Generator<R, T, S>) => void
diff --git a/tests/baselines/reference/importExportInternalComments.symbols b/tests/baselines/reference/importExportInternalComments.symbols
index 6955f1e989650..26933a7c13f41 100644
--- a/tests/baselines/reference/importExportInternalComments.symbols
+++ b/tests/baselines/reference/importExportInternalComments.symbols
@@ -6,7 +6,7 @@ declare module "foo";
 
 === default.ts ===
 /*1*/ export /*2*/ default /*3*/ Array /*4*/;
->Array : Symbol(Array, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.symbol.wellknown.d.ts, --, --) ... and 4 more)
+>Array : Symbol(Array, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.symbol.wellknown.d.ts, --, --) ... and 5 more)
 
 === index.ts ===
 /*1*/ import /*2*/ D /*3*/, /*4*/ { /*5*/ A /*6*/, /*7*/ B /*8*/ as /*9*/ C /*10*/ } /*11*/ from /*12*/ "foo";
diff --git a/tests/baselines/reference/keyofAndIndexedAccess2.symbols b/tests/baselines/reference/keyofAndIndexedAccess2.symbols
index 8edacc205b583..852c238e38506 100644
--- a/tests/baselines/reference/keyofAndIndexedAccess2.symbols
+++ b/tests/baselines/reference/keyofAndIndexedAccess2.symbols
@@ -446,9 +446,9 @@ function fn<T extends {elements: Array<string>} | {elements: Array<number>}>(par
 >fn : Symbol(fn, Decl(keyofAndIndexedAccess2.ts, 115, 69))
 >T : Symbol(T, Decl(keyofAndIndexedAccess2.ts, 119, 12))
 >elements : Symbol(elements, Decl(keyofAndIndexedAccess2.ts, 119, 23))
->Array : Symbol(Array, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.symbol.wellknown.d.ts, --, --) ... and 4 more)
+>Array : Symbol(Array, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.symbol.wellknown.d.ts, --, --) ... and 5 more)
 >elements : Symbol(elements, Decl(keyofAndIndexedAccess2.ts, 119, 51))
->Array : Symbol(Array, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.symbol.wellknown.d.ts, --, --) ... and 4 more)
+>Array : Symbol(Array, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.symbol.wellknown.d.ts, --, --) ... and 5 more)
 >param : Symbol(param, Decl(keyofAndIndexedAccess2.ts, 119, 77))
 >T : Symbol(T, Decl(keyofAndIndexedAccess2.ts, 119, 12))
 >cb : Symbol(cb, Decl(keyofAndIndexedAccess2.ts, 119, 86))
@@ -465,7 +465,7 @@ function fn<T extends {elements: Array<string>} | {elements: Array<number>}>(par
 function fn2<T extends Array<string>>(param: T, cb: (element: T[number]) => void) {
 >fn2 : Symbol(fn2, Decl(keyofAndIndexedAccess2.ts, 121, 1))
 >T : Symbol(T, Decl(keyofAndIndexedAccess2.ts, 123, 13))
->Array : Symbol(Array, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.symbol.wellknown.d.ts, --, --) ... and 4 more)
+>Array : Symbol(Array, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.symbol.wellknown.d.ts, --, --) ... and 5 more)
 >param : Symbol(param, Decl(keyofAndIndexedAccess2.ts, 123, 38))
 >T : Symbol(T, Decl(keyofAndIndexedAccess2.ts, 123, 13))
 >cb : Symbol(cb, Decl(keyofAndIndexedAccess2.ts, 123, 47))
@@ -500,7 +500,7 @@ function fn4<K extends number>() {
 
     let x: Array<string>[K] = 'abc';
 >x : Symbol(x, Decl(keyofAndIndexedAccess2.ts, 134, 7))
->Array : Symbol(Array, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.symbol.wellknown.d.ts, --, --) ... and 4 more)
+>Array : Symbol(Array, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.symbol.wellknown.d.ts, --, --) ... and 5 more)
 >K : Symbol(K, Decl(keyofAndIndexedAccess2.ts, 133, 13))
 
     let y: ReadonlyArray<string>[K] = 'abc';
diff --git a/tests/baselines/reference/modulePreserve2.trace.json b/tests/baselines/reference/modulePreserve2.trace.json
index 406e188dcf219..61b13a4e9d212 100644
--- a/tests/baselines/reference/modulePreserve2.trace.json
+++ b/tests/baselines/reference/modulePreserve2.trace.json
@@ -1019,6 +1019,20 @@
     "======== Module name '@typescript/lib-esnext/regexp' was not resolved. ========",
     "File '/.ts/package.json' does not exist according to earlier cached lookups.",
     "File '/package.json' does not exist according to earlier cached lookups.",
+    "======== Resolving module '@typescript/lib-esnext/iterator' from '/.src/__lib_node_modules_lookup_lib.esnext.iterator.d.ts__.ts'. ========",
+    "Explicitly specified module resolution kind: 'Node10'.",
+    "Loading module '@typescript/lib-esnext/iterator' from 'node_modules' folder, target file types: TypeScript, Declaration.",
+    "Searching all ancestor node_modules directories for preferred extensions: TypeScript, Declaration.",
+    "Directory '/.src/node_modules' does not exist, skipping all lookups in it.",
+    "Scoped package detected, looking in 'typescript__lib-esnext/iterator'",
+    "Directory '/node_modules/@types' does not exist, skipping all lookups in it.",
+    "Scoped package detected, looking in 'typescript__lib-esnext/iterator'",
+    "Loading module '@typescript/lib-esnext/iterator' from 'node_modules' folder, target file types: JavaScript.",
+    "Searching all ancestor node_modules directories for fallback extensions: JavaScript.",
+    "Directory '/.src/node_modules' does not exist, skipping all lookups in it.",
+    "======== Module name '@typescript/lib-esnext/iterator' was not resolved. ========",
+    "File '/.ts/package.json' does not exist according to earlier cached lookups.",
+    "File '/package.json' does not exist according to earlier cached lookups.",
     "======== Resolving module '@typescript/lib-dom' from '/.src/__lib_node_modules_lookup_lib.dom.d.ts__.ts'. ========",
     "Explicitly specified module resolution kind: 'Node10'.",
     "Loading module '@typescript/lib-dom' from 'node_modules' folder, target file types: TypeScript, Declaration.",
diff --git a/tests/baselines/reference/modulePreserve3.trace.json b/tests/baselines/reference/modulePreserve3.trace.json
index 26a3f3176c907..3bfbc02675d4c 100644
--- a/tests/baselines/reference/modulePreserve3.trace.json
+++ b/tests/baselines/reference/modulePreserve3.trace.json
@@ -951,6 +951,19 @@
     "======== Module name '@typescript/lib-esnext/regexp' was not resolved. ========",
     "File '/.ts/package.json' does not exist according to earlier cached lookups.",
     "File '/package.json' does not exist according to earlier cached lookups.",
+    "======== Resolving module '@typescript/lib-esnext/iterator' from '/.src/__lib_node_modules_lookup_lib.esnext.iterator.d.ts__.ts'. ========",
+    "Explicitly specified module resolution kind: 'Node10'.",
+    "Loading module '@typescript/lib-esnext/iterator' from 'node_modules' folder, target file types: TypeScript, Declaration.",
+    "Searching all ancestor node_modules directories for preferred extensions: TypeScript, Declaration.",
+    "Directory '/.src/node_modules' does not exist, skipping all lookups in it.",
+    "Scoped package detected, looking in 'typescript__lib-esnext/iterator'",
+    "Scoped package detected, looking in 'typescript__lib-esnext/iterator'",
+    "Loading module '@typescript/lib-esnext/iterator' from 'node_modules' folder, target file types: JavaScript.",
+    "Searching all ancestor node_modules directories for fallback extensions: JavaScript.",
+    "Directory '/.src/node_modules' does not exist, skipping all lookups in it.",
+    "======== Module name '@typescript/lib-esnext/iterator' was not resolved. ========",
+    "File '/.ts/package.json' does not exist according to earlier cached lookups.",
+    "File '/package.json' does not exist according to earlier cached lookups.",
     "======== Resolving module '@typescript/lib-dom' from '/.src/__lib_node_modules_lookup_lib.dom.d.ts__.ts'. ========",
     "Explicitly specified module resolution kind: 'Node10'.",
     "Loading module '@typescript/lib-dom' from 'node_modules' folder, target file types: TypeScript, Declaration.",
diff --git a/tests/baselines/reference/narrowingPastLastAssignment.symbols b/tests/baselines/reference/narrowingPastLastAssignment.symbols
index 4ace603d16418..810ec8984188f 100644
--- a/tests/baselines/reference/narrowingPastLastAssignment.symbols
+++ b/tests/baselines/reference/narrowingPastLastAssignment.symbols
@@ -334,7 +334,7 @@ function f12() {
     const fooMap: Map<string,Array<number>> = new Map()
 >fooMap : Symbol(fooMap, Decl(narrowingPastLastAssignment.ts, 145, 9))
 >Map : Symbol(Map, Decl(lib.es2015.collection.d.ts, --, --), Decl(lib.es2015.collection.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.symbol.wellknown.d.ts, --, --))
->Array : Symbol(Array, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.symbol.wellknown.d.ts, --, --) ... and 4 more)
+>Array : Symbol(Array, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.symbol.wellknown.d.ts, --, --) ... and 5 more)
 >Map : Symbol(Map, Decl(lib.es2015.collection.d.ts, --, --), Decl(lib.es2015.collection.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.symbol.wellknown.d.ts, --, --))
 
     const values = [1, 2, 3, 4, 5];
diff --git a/tests/baselines/reference/nativeIterator.js b/tests/baselines/reference/nativeIterator.js
new file mode 100644
index 0000000000000..42506545681dc
--- /dev/null
+++ b/tests/baselines/reference/nativeIterator.js
@@ -0,0 +1,54 @@
+//// [tests/cases/compiler/nativeIterator.ts] ////
+
+//// [nativeIterator.ts]
+const iterator = Iterator.from([0, 1, 2]);
+
+const mapped = iterator.map(String);
+
+const filtered = iterator.filter(x => x > 0);
+
+function isZero(x: number): x is 0 {
+  return x === 0;
+}
+const zero = iterator.filter(isZero);
+
+const iteratorFromBare = Iterator.from({
+  next() {
+    return {
+      done: Math.random() < .5,
+      value: "a string",
+    };
+  },
+});
+
+
+function* gen() {
+  yield 0;
+}
+
+const mappedGen = gen().map(x => x === 0 ? "zero" : "other");
+
+const mappedValues = [0, 1, 2].values().map(x => x === 0 ? "zero" : "other");
+
+
+//// [nativeIterator.js]
+const iterator = Iterator.from([0, 1, 2]);
+const mapped = iterator.map(String);
+const filtered = iterator.filter(x => x > 0);
+function isZero(x) {
+    return x === 0;
+}
+const zero = iterator.filter(isZero);
+const iteratorFromBare = Iterator.from({
+    next() {
+        return {
+            done: Math.random() < .5,
+            value: "a string",
+        };
+    },
+});
+function* gen() {
+    yield 0;
+}
+const mappedGen = gen().map(x => x === 0 ? "zero" : "other");
+const mappedValues = [0, 1, 2].values().map(x => x === 0 ? "zero" : "other");
diff --git a/tests/baselines/reference/nativeIterator.symbols b/tests/baselines/reference/nativeIterator.symbols
new file mode 100644
index 0000000000000..7574ee376ddbd
--- /dev/null
+++ b/tests/baselines/reference/nativeIterator.symbols
@@ -0,0 +1,86 @@
+//// [tests/cases/compiler/nativeIterator.ts] ////
+
+=== nativeIterator.ts ===
+const iterator = Iterator.from([0, 1, 2]);
+>iterator : Symbol(iterator, Decl(nativeIterator.ts, 0, 5))
+>Iterator.from : Symbol(IteratorConstructor.from, Decl(lib.esnext.iterator.d.ts, --, --))
+>Iterator : Symbol(Iterator, Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.esnext.iterator.d.ts, --, --))
+>from : Symbol(IteratorConstructor.from, Decl(lib.esnext.iterator.d.ts, --, --))
+
+const mapped = iterator.map(String);
+>mapped : Symbol(mapped, Decl(nativeIterator.ts, 2, 5))
+>iterator.map : Symbol(NativeIterator.map, Decl(lib.esnext.iterator.d.ts, --, --))
+>iterator : Symbol(iterator, Decl(nativeIterator.ts, 0, 5))
+>map : Symbol(NativeIterator.map, Decl(lib.esnext.iterator.d.ts, --, --))
+>String : Symbol(String, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --) ... and 6 more)
+
+const filtered = iterator.filter(x => x > 0);
+>filtered : Symbol(filtered, Decl(nativeIterator.ts, 4, 5))
+>iterator.filter : Symbol(NativeIterator.filter, Decl(lib.esnext.iterator.d.ts, --, --), Decl(lib.esnext.iterator.d.ts, --, --))
+>iterator : Symbol(iterator, Decl(nativeIterator.ts, 0, 5))
+>filter : Symbol(NativeIterator.filter, Decl(lib.esnext.iterator.d.ts, --, --), Decl(lib.esnext.iterator.d.ts, --, --))
+>x : Symbol(x, Decl(nativeIterator.ts, 4, 33))
+>x : Symbol(x, Decl(nativeIterator.ts, 4, 33))
+
+function isZero(x: number): x is 0 {
+>isZero : Symbol(isZero, Decl(nativeIterator.ts, 4, 45))
+>x : Symbol(x, Decl(nativeIterator.ts, 6, 16))
+>x : Symbol(x, Decl(nativeIterator.ts, 6, 16))
+
+  return x === 0;
+>x : Symbol(x, Decl(nativeIterator.ts, 6, 16))
+}
+const zero = iterator.filter(isZero);
+>zero : Symbol(zero, Decl(nativeIterator.ts, 9, 5))
+>iterator.filter : Symbol(NativeIterator.filter, Decl(lib.esnext.iterator.d.ts, --, --), Decl(lib.esnext.iterator.d.ts, --, --))
+>iterator : Symbol(iterator, Decl(nativeIterator.ts, 0, 5))
+>filter : Symbol(NativeIterator.filter, Decl(lib.esnext.iterator.d.ts, --, --), Decl(lib.esnext.iterator.d.ts, --, --))
+>isZero : Symbol(isZero, Decl(nativeIterator.ts, 4, 45))
+
+const iteratorFromBare = Iterator.from({
+>iteratorFromBare : Symbol(iteratorFromBare, Decl(nativeIterator.ts, 11, 5))
+>Iterator.from : Symbol(IteratorConstructor.from, Decl(lib.esnext.iterator.d.ts, --, --))
+>Iterator : Symbol(Iterator, Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.esnext.iterator.d.ts, --, --))
+>from : Symbol(IteratorConstructor.from, Decl(lib.esnext.iterator.d.ts, --, --))
+
+  next() {
+>next : Symbol(next, Decl(nativeIterator.ts, 11, 40))
+
+    return {
+      done: Math.random() < .5,
+>done : Symbol(done, Decl(nativeIterator.ts, 13, 12))
+>Math.random : Symbol(Math.random, Decl(lib.es5.d.ts, --, --))
+>Math : Symbol(Math, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.symbol.wellknown.d.ts, --, --))
+>random : Symbol(Math.random, Decl(lib.es5.d.ts, --, --))
+
+      value: "a string",
+>value : Symbol(value, Decl(nativeIterator.ts, 14, 31))
+
+    };
+  },
+});
+
+
+function* gen() {
+>gen : Symbol(gen, Decl(nativeIterator.ts, 18, 3))
+
+  yield 0;
+}
+
+const mappedGen = gen().map(x => x === 0 ? "zero" : "other");
+>mappedGen : Symbol(mappedGen, Decl(nativeIterator.ts, 25, 5))
+>gen().map : Symbol(NativeIterator.map, Decl(lib.esnext.iterator.d.ts, --, --))
+>gen : Symbol(gen, Decl(nativeIterator.ts, 18, 3))
+>map : Symbol(NativeIterator.map, Decl(lib.esnext.iterator.d.ts, --, --))
+>x : Symbol(x, Decl(nativeIterator.ts, 25, 28))
+>x : Symbol(x, Decl(nativeIterator.ts, 25, 28))
+
+const mappedValues = [0, 1, 2].values().map(x => x === 0 ? "zero" : "other");
+>mappedValues : Symbol(mappedValues, Decl(nativeIterator.ts, 27, 5))
+>[0, 1, 2].values().map : Symbol(NativeIterator.map, Decl(lib.esnext.iterator.d.ts, --, --))
+>[0, 1, 2].values : Symbol(Array.values, Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.esnext.iterator.d.ts, --, --))
+>values : Symbol(Array.values, Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.esnext.iterator.d.ts, --, --))
+>map : Symbol(NativeIterator.map, Decl(lib.esnext.iterator.d.ts, --, --))
+>x : Symbol(x, Decl(nativeIterator.ts, 27, 44))
+>x : Symbol(x, Decl(nativeIterator.ts, 27, 44))
+
diff --git a/tests/baselines/reference/nativeIterator.types b/tests/baselines/reference/nativeIterator.types
new file mode 100644
index 0000000000000..d8ed9d812754b
--- /dev/null
+++ b/tests/baselines/reference/nativeIterator.types
@@ -0,0 +1,216 @@
+//// [tests/cases/compiler/nativeIterator.ts] ////
+
+=== nativeIterator.ts ===
+const iterator = Iterator.from([0, 1, 2]);
+>iterator : NativeIterator<number, void, undefined>
+>         : ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+>Iterator.from([0, 1, 2]) : NativeIterator<number, void, undefined>
+>                         : ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+>Iterator.from : <T>(value: Iterator<T> | Iterable<T>) => NativeIterator<T, void, undefined>
+>              : ^ ^^     ^^                         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+>Iterator : (abstract new <T>() => NativeIterator<T, void, undefined>) & IteratorConstructor
+>         : ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+>from : <T>(value: Iterator<T> | Iterable<T>) => NativeIterator<T, void, undefined>
+>     : ^ ^^     ^^                         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+>[0, 1, 2] : number[]
+>          : ^^^^^^^^
+>0 : 0
+>  : ^
+>1 : 1
+>  : ^
+>2 : 2
+>  : ^
+
+const mapped = iterator.map(String);
+>mapped : NativeIterator<string, void, undefined>
+>       : ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+>iterator.map(String) : NativeIterator<string, void, undefined>
+>                     : ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+>iterator.map : <U>(callbackfn: (value: number, index: number) => U) => NativeIterator<U, void, undefined>
+>             : ^^^^          ^^^     ^^^^^^^^^^     ^^      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+>iterator : NativeIterator<number, void, undefined>
+>         : ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+>map : <U>(callbackfn: (value: number, index: number) => U) => NativeIterator<U, void, undefined>
+>    : ^^^^          ^^^     ^^^^^^^^^^     ^^      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+>String : StringConstructor
+>       : ^^^^^^^^^^^^^^^^^
+
+const filtered = iterator.filter(x => x > 0);
+>filtered : NativeIterator<number, void, undefined>
+>         : ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+>iterator.filter(x => x > 0) : NativeIterator<number, void, undefined>
+>                            : ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+>iterator.filter : { <S extends number>(predicate: (value: number, index: number) => value is S): NativeIterator<S, void, undefined>; (predicate: (value: number, index: number) => unknown): NativeIterator<number, void, undefined>; }
+>                : ^^^^^^^^^^^^^^^^^^^^^         ^^^     ^^^^^^^^^^     ^^      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^         ^^^     ^^^^^^^^^^     ^^      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+>iterator : NativeIterator<number, void, undefined>
+>         : ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+>filter : { <S extends number>(predicate: (value: number, index: number) => value is S): NativeIterator<S, void, undefined>; (predicate: (value: number, index: number) => unknown): NativeIterator<number, void, undefined>; }
+>       : ^^^^^^^^^^^^^^^^^^^^^         ^^^     ^^^^^^^^^^     ^^      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^         ^^^     ^^^^^^^^^^     ^^      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+>x => x > 0 : (x: number) => boolean
+>           : ^ ^^^^^^^^^^^^^^^^^^^^
+>x : number
+>  : ^^^^^^
+>x > 0 : boolean
+>      : ^^^^^^^
+>x : number
+>  : ^^^^^^
+>0 : 0
+>  : ^
+
+function isZero(x: number): x is 0 {
+>isZero : (x: number) => x is 0
+>       : ^ ^^      ^^^^^      
+>x : number
+>  : ^^^^^^
+
+  return x === 0;
+>x === 0 : boolean
+>        : ^^^^^^^
+>x : number
+>  : ^^^^^^
+>0 : 0
+>  : ^
+}
+const zero = iterator.filter(isZero);
+>zero : NativeIterator<0, void, undefined>
+>     : ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+>iterator.filter(isZero) : NativeIterator<0, void, undefined>
+>                        : ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+>iterator.filter : { <S extends number>(predicate: (value: number, index: number) => value is S): NativeIterator<S, void, undefined>; (predicate: (value: number, index: number) => unknown): NativeIterator<number, void, undefined>; }
+>                : ^^^^^^^^^^^^^^^^^^^^^         ^^^     ^^^^^^^^^^     ^^      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^         ^^^     ^^^^^^^^^^     ^^      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+>iterator : NativeIterator<number, void, undefined>
+>         : ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+>filter : { <S extends number>(predicate: (value: number, index: number) => value is S): NativeIterator<S, void, undefined>; (predicate: (value: number, index: number) => unknown): NativeIterator<number, void, undefined>; }
+>       : ^^^^^^^^^^^^^^^^^^^^^         ^^^     ^^^^^^^^^^     ^^      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^         ^^^     ^^^^^^^^^^     ^^      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+>isZero : (x: number) => x is 0
+>       : ^ ^^      ^^^^^^^^^^^
+
+const iteratorFromBare = Iterator.from({
+>iteratorFromBare : NativeIterator<string, void, undefined>
+>                 : ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+>Iterator.from({  next() {    return {      done: Math.random() < .5,      value: "a string",    };  },}) : NativeIterator<string, void, undefined>
+>                                                                                                         : ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+>Iterator.from : <T>(value: Iterator<T> | Iterable<T>) => NativeIterator<T, void, undefined>
+>              : ^ ^^     ^^                         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+>Iterator : (abstract new <T>() => NativeIterator<T, void, undefined>) & IteratorConstructor
+>         : ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+>from : <T>(value: Iterator<T> | Iterable<T>) => NativeIterator<T, void, undefined>
+>     : ^ ^^     ^^                         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+>{  next() {    return {      done: Math.random() < .5,      value: "a string",    };  },} : { next(): { done: boolean; value: string; }; }
+>                                                                                          : ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+  next() {
+>next : () => { done: boolean; value: string; }
+>     : ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+    return {
+>{      done: Math.random() < .5,      value: "a string",    } : { done: boolean; value: string; }
+>                                                              : ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+      done: Math.random() < .5,
+>done : boolean
+>     : ^^^^^^^
+>Math.random() < .5 : boolean
+>                   : ^^^^^^^
+>Math.random() : number
+>              : ^^^^^^
+>Math.random : () => number
+>            : ^^^^^^^^^^^^
+>Math : Math
+>     : ^^^^
+>random : () => number
+>       : ^^^^^^^^^^^^
+>.5 : 0.5
+>   : ^^^
+
+      value: "a string",
+>value : string
+>      : ^^^^^^
+>"a string" : "a string"
+>           : ^^^^^^^^^^
+
+    };
+  },
+});
+
+
+function* gen() {
+>gen : () => Generator<number, void, unknown>
+>    : ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+  yield 0;
+>yield 0 : any
+>0 : 0
+>  : ^
+}
+
+const mappedGen = gen().map(x => x === 0 ? "zero" : "other");
+>mappedGen : NativeIterator<"zero" | "other", void, undefined>
+>          : ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+>gen().map(x => x === 0 ? "zero" : "other") : NativeIterator<"zero" | "other", void, undefined>
+>                                           : ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+>gen().map : <U>(callbackfn: (value: number, index: number) => U) => NativeIterator<U, void, undefined>
+>          : ^^^^          ^^^     ^^^^^^^^^^     ^^      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+>gen() : Generator<number, void, unknown>
+>      : ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+>gen : () => Generator<number, void, unknown>
+>    : ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+>map : <U>(callbackfn: (value: number, index: number) => U) => NativeIterator<U, void, undefined>
+>    : ^^^^          ^^^     ^^^^^^^^^^     ^^      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+>x => x === 0 ? "zero" : "other" : (x: number) => "zero" | "other"
+>                                : ^ ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+>x : number
+>  : ^^^^^^
+>x === 0 ? "zero" : "other" : "zero" | "other"
+>                           : ^^^^^^^^^^^^^^^^
+>x === 0 : boolean
+>        : ^^^^^^^
+>x : number
+>  : ^^^^^^
+>0 : 0
+>  : ^
+>"zero" : "zero"
+>       : ^^^^^^
+>"other" : "other"
+>        : ^^^^^^^
+
+const mappedValues = [0, 1, 2].values().map(x => x === 0 ? "zero" : "other");
+>mappedValues : NativeIterator<"zero" | "other", void, undefined>
+>             : ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+>[0, 1, 2].values().map(x => x === 0 ? "zero" : "other") : NativeIterator<"zero" | "other", void, undefined>
+>                                                        : ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+>[0, 1, 2].values().map : <U>(callbackfn: (value: number, index: number) => U) => NativeIterator<U, void, undefined>
+>                       : ^^^^          ^^^     ^^^^^^^^^^     ^^      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+>[0, 1, 2].values() : NativeIterator<number, void, undefined>
+>                   : ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+>[0, 1, 2].values : { (): IterableIterator<number>; (): NativeIterator<number, void, undefined>; }
+>                 : ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+>[0, 1, 2] : number[]
+>          : ^^^^^^^^
+>0 : 0
+>  : ^
+>1 : 1
+>  : ^
+>2 : 2
+>  : ^
+>values : { (): IterableIterator<number>; (): NativeIterator<number, void, undefined>; }
+>       : ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+>map : <U>(callbackfn: (value: number, index: number) => U) => NativeIterator<U, void, undefined>
+>    : ^^^^          ^^^     ^^^^^^^^^^     ^^      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+>x => x === 0 ? "zero" : "other" : (x: number) => "zero" | "other"
+>                                : ^ ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+>x : number
+>  : ^^^^^^
+>x === 0 ? "zero" : "other" : "zero" | "other"
+>                           : ^^^^^^^^^^^^^^^^
+>x === 0 : boolean
+>        : ^^^^^^^
+>x : number
+>  : ^^^^^^
+>0 : 0
+>  : ^
+>"zero" : "zero"
+>       : ^^^^^^
+>"other" : "other"
+>        : ^^^^^^^
+
diff --git a/tests/baselines/reference/noIterationTypeErrorsInCFA.symbols b/tests/baselines/reference/noIterationTypeErrorsInCFA.symbols
index 211e351019cc1..413b8f145d85e 100644
--- a/tests/baselines/reference/noIterationTypeErrorsInCFA.symbols
+++ b/tests/baselines/reference/noIterationTypeErrorsInCFA.symbols
@@ -15,7 +15,7 @@ export function doRemove(dds: F | F[]) {
 
     if (!Array.isArray(dds)) {
 >Array.isArray : Symbol(ArrayConstructor.isArray, Decl(lib.es5.d.ts, --, --))
->Array : Symbol(Array, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.symbol.wellknown.d.ts, --, --) ... and 4 more)
+>Array : Symbol(Array, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.symbol.wellknown.d.ts, --, --) ... and 5 more)
 >isArray : Symbol(ArrayConstructor.isArray, Decl(lib.es5.d.ts, --, --))
 >dds : Symbol(dds, Decl(noIterationTypeErrorsInCFA.ts, 3, 25))
 
diff --git a/tests/baselines/reference/nodeModulesExportsBlocksTypesVersions(module=nodenext).trace.json b/tests/baselines/reference/nodeModulesExportsBlocksTypesVersions(module=nodenext).trace.json
index 6bd7d40222f9b..6ce9644bf9c65 100644
--- a/tests/baselines/reference/nodeModulesExportsBlocksTypesVersions(module=nodenext).trace.json
+++ b/tests/baselines/reference/nodeModulesExportsBlocksTypesVersions(module=nodenext).trace.json
@@ -1189,6 +1189,20 @@
     "======== Module name '@typescript/lib-esnext/regexp' was not resolved. ========",
     "File '/.ts/package.json' does not exist according to earlier cached lookups.",
     "File '/package.json' does not exist according to earlier cached lookups.",
+    "======== Resolving module '@typescript/lib-esnext/iterator' from '/.src/__lib_node_modules_lookup_lib.esnext.iterator.d.ts__.ts'. ========",
+    "Explicitly specified module resolution kind: 'Node10'.",
+    "Loading module '@typescript/lib-esnext/iterator' from 'node_modules' folder, target file types: TypeScript, Declaration.",
+    "Searching all ancestor node_modules directories for preferred extensions: TypeScript, Declaration.",
+    "Directory '/.src/node_modules' does not exist, skipping all lookups in it.",
+    "Scoped package detected, looking in 'typescript__lib-esnext/iterator'",
+    "Directory '/node_modules/@types' does not exist, skipping all lookups in it.",
+    "Scoped package detected, looking in 'typescript__lib-esnext/iterator'",
+    "Loading module '@typescript/lib-esnext/iterator' from 'node_modules' folder, target file types: JavaScript.",
+    "Searching all ancestor node_modules directories for fallback extensions: JavaScript.",
+    "Directory '/.src/node_modules' does not exist, skipping all lookups in it.",
+    "======== Module name '@typescript/lib-esnext/iterator' was not resolved. ========",
+    "File '/.ts/package.json' does not exist according to earlier cached lookups.",
+    "File '/package.json' does not exist according to earlier cached lookups.",
     "======== Resolving module '@typescript/lib-dom' from '/.src/__lib_node_modules_lookup_lib.dom.d.ts__.ts'. ========",
     "Explicitly specified module resolution kind: 'Node10'.",
     "Loading module '@typescript/lib-dom' from 'node_modules' folder, target file types: TypeScript, Declaration.",
diff --git a/tests/baselines/reference/nodeModulesPackageImports(module=nodenext).trace.json b/tests/baselines/reference/nodeModulesPackageImports(module=nodenext).trace.json
index 0faf9ac8e2d24..84552c9fbe071 100644
--- a/tests/baselines/reference/nodeModulesPackageImports(module=nodenext).trace.json
+++ b/tests/baselines/reference/nodeModulesPackageImports(module=nodenext).trace.json
@@ -1133,6 +1133,21 @@
     "======== Module name '@typescript/lib-esnext/regexp' was not resolved. ========",
     "File '/.ts/package.json' does not exist according to earlier cached lookups.",
     "File '/package.json' does not exist according to earlier cached lookups.",
+    "======== Resolving module '@typescript/lib-esnext/iterator' from '/.src/__lib_node_modules_lookup_lib.esnext.iterator.d.ts__.ts'. ========",
+    "Explicitly specified module resolution kind: 'Node10'.",
+    "Loading module '@typescript/lib-esnext/iterator' from 'node_modules' folder, target file types: TypeScript, Declaration.",
+    "Searching all ancestor node_modules directories for preferred extensions: TypeScript, Declaration.",
+    "Directory '/.src/node_modules' does not exist, skipping all lookups in it.",
+    "Scoped package detected, looking in 'typescript__lib-esnext/iterator'",
+    "Directory '/node_modules' does not exist, skipping all lookups in it.",
+    "Scoped package detected, looking in 'typescript__lib-esnext/iterator'",
+    "Loading module '@typescript/lib-esnext/iterator' from 'node_modules' folder, target file types: JavaScript.",
+    "Searching all ancestor node_modules directories for fallback extensions: JavaScript.",
+    "Directory '/.src/node_modules' does not exist, skipping all lookups in it.",
+    "Directory '/node_modules' does not exist, skipping all lookups in it.",
+    "======== Module name '@typescript/lib-esnext/iterator' was not resolved. ========",
+    "File '/.ts/package.json' does not exist according to earlier cached lookups.",
+    "File '/package.json' does not exist according to earlier cached lookups.",
     "======== Resolving module '@typescript/lib-dom' from '/.src/__lib_node_modules_lookup_lib.dom.d.ts__.ts'. ========",
     "Explicitly specified module resolution kind: 'Node10'.",
     "Loading module '@typescript/lib-dom' from 'node_modules' folder, target file types: TypeScript, Declaration.",
diff --git a/tests/baselines/reference/nodeModulesPackagePatternExportsTrailers(module=nodenext).trace.json b/tests/baselines/reference/nodeModulesPackagePatternExportsTrailers(module=nodenext).trace.json
index 0ef4d5da75fb7..1d857712fbca0 100644
--- a/tests/baselines/reference/nodeModulesPackagePatternExportsTrailers(module=nodenext).trace.json
+++ b/tests/baselines/reference/nodeModulesPackagePatternExportsTrailers(module=nodenext).trace.json
@@ -1170,6 +1170,20 @@
     "======== Module name '@typescript/lib-esnext/regexp' was not resolved. ========",
     "File '/.ts/package.json' does not exist according to earlier cached lookups.",
     "File '/package.json' does not exist according to earlier cached lookups.",
+    "======== Resolving module '@typescript/lib-esnext/iterator' from '/.src/__lib_node_modules_lookup_lib.esnext.iterator.d.ts__.ts'. ========",
+    "Explicitly specified module resolution kind: 'Node10'.",
+    "Loading module '@typescript/lib-esnext/iterator' from 'node_modules' folder, target file types: TypeScript, Declaration.",
+    "Searching all ancestor node_modules directories for preferred extensions: TypeScript, Declaration.",
+    "Directory '/.src/node_modules/@types' does not exist, skipping all lookups in it.",
+    "Scoped package detected, looking in 'typescript__lib-esnext/iterator'",
+    "Directory '/node_modules' does not exist, skipping all lookups in it.",
+    "Scoped package detected, looking in 'typescript__lib-esnext/iterator'",
+    "Loading module '@typescript/lib-esnext/iterator' from 'node_modules' folder, target file types: JavaScript.",
+    "Searching all ancestor node_modules directories for fallback extensions: JavaScript.",
+    "Directory '/node_modules' does not exist, skipping all lookups in it.",
+    "======== Module name '@typescript/lib-esnext/iterator' was not resolved. ========",
+    "File '/.ts/package.json' does not exist according to earlier cached lookups.",
+    "File '/package.json' does not exist according to earlier cached lookups.",
     "======== Resolving module '@typescript/lib-dom' from '/.src/__lib_node_modules_lookup_lib.dom.d.ts__.ts'. ========",
     "Explicitly specified module resolution kind: 'Node10'.",
     "Loading module '@typescript/lib-dom' from 'node_modules' folder, target file types: TypeScript, Declaration.",
diff --git a/tests/baselines/reference/reactJsxReactResolvedNodeNext.trace.json b/tests/baselines/reference/reactJsxReactResolvedNodeNext.trace.json
index d19286646e834..793a061fb3bbd 100644
--- a/tests/baselines/reference/reactJsxReactResolvedNodeNext.trace.json
+++ b/tests/baselines/reference/reactJsxReactResolvedNodeNext.trace.json
@@ -964,6 +964,19 @@
     "======== Module name '@typescript/lib-esnext/regexp' was not resolved. ========",
     "File '/.ts/package.json' does not exist according to earlier cached lookups.",
     "File '/package.json' does not exist according to earlier cached lookups.",
+    "======== Resolving module '@typescript/lib-esnext/iterator' from '/.src/__lib_node_modules_lookup_lib.esnext.iterator.d.ts__.ts'. ========",
+    "Explicitly specified module resolution kind: 'Node10'.",
+    "Loading module '@typescript/lib-esnext/iterator' from 'node_modules' folder, target file types: TypeScript, Declaration.",
+    "Searching all ancestor node_modules directories for preferred extensions: TypeScript, Declaration.",
+    "Scoped package detected, looking in 'typescript__lib-esnext/iterator'",
+    "Directory '/node_modules' does not exist, skipping all lookups in it.",
+    "Scoped package detected, looking in 'typescript__lib-esnext/iterator'",
+    "Loading module '@typescript/lib-esnext/iterator' from 'node_modules' folder, target file types: JavaScript.",
+    "Searching all ancestor node_modules directories for fallback extensions: JavaScript.",
+    "Directory '/node_modules' does not exist, skipping all lookups in it.",
+    "======== Module name '@typescript/lib-esnext/iterator' was not resolved. ========",
+    "File '/.ts/package.json' does not exist according to earlier cached lookups.",
+    "File '/package.json' does not exist according to earlier cached lookups.",
     "======== Resolving module '@typescript/lib-dom' from '/.src/__lib_node_modules_lookup_lib.dom.d.ts__.ts'. ========",
     "Explicitly specified module resolution kind: 'Node10'.",
     "Loading module '@typescript/lib-dom' from 'node_modules' folder, target file types: TypeScript, Declaration.",
diff --git a/tests/baselines/reference/reactJsxReactResolvedNodeNextEsm.trace.json b/tests/baselines/reference/reactJsxReactResolvedNodeNextEsm.trace.json
index 1849087a77565..fd26708d87106 100644
--- a/tests/baselines/reference/reactJsxReactResolvedNodeNextEsm.trace.json
+++ b/tests/baselines/reference/reactJsxReactResolvedNodeNextEsm.trace.json
@@ -964,6 +964,19 @@
     "======== Module name '@typescript/lib-esnext/regexp' was not resolved. ========",
     "File '/.ts/package.json' does not exist according to earlier cached lookups.",
     "File '/package.json' does not exist according to earlier cached lookups.",
+    "======== Resolving module '@typescript/lib-esnext/iterator' from '/.src/__lib_node_modules_lookup_lib.esnext.iterator.d.ts__.ts'. ========",
+    "Explicitly specified module resolution kind: 'Node10'.",
+    "Loading module '@typescript/lib-esnext/iterator' from 'node_modules' folder, target file types: TypeScript, Declaration.",
+    "Searching all ancestor node_modules directories for preferred extensions: TypeScript, Declaration.",
+    "Scoped package detected, looking in 'typescript__lib-esnext/iterator'",
+    "Directory '/node_modules' does not exist, skipping all lookups in it.",
+    "Scoped package detected, looking in 'typescript__lib-esnext/iterator'",
+    "Loading module '@typescript/lib-esnext/iterator' from 'node_modules' folder, target file types: JavaScript.",
+    "Searching all ancestor node_modules directories for fallback extensions: JavaScript.",
+    "Directory '/node_modules' does not exist, skipping all lookups in it.",
+    "======== Module name '@typescript/lib-esnext/iterator' was not resolved. ========",
+    "File '/.ts/package.json' does not exist according to earlier cached lookups.",
+    "File '/package.json' does not exist according to earlier cached lookups.",
     "======== Resolving module '@typescript/lib-dom' from '/.src/__lib_node_modules_lookup_lib.dom.d.ts__.ts'. ========",
     "Explicitly specified module resolution kind: 'Node10'.",
     "Loading module '@typescript/lib-dom' from 'node_modules' folder, target file types: TypeScript, Declaration.",
diff --git a/tests/baselines/reference/recursiveConditionalTypes.symbols b/tests/baselines/reference/recursiveConditionalTypes.symbols
index 8bf1bf55f2154..eb5f13075710f 100644
--- a/tests/baselines/reference/recursiveConditionalTypes.symbols
+++ b/tests/baselines/reference/recursiveConditionalTypes.symbols
@@ -568,7 +568,7 @@ let five: Add<2, 3>;
 type _PrependNextNum<A extends Array<unknown>> = A['length'] extends infer T
 >_PrependNextNum : Symbol(_PrependNextNum, Decl(recursiveConditionalTypes.ts, 147, 20))
 >A : Symbol(A, Decl(recursiveConditionalTypes.ts, 151, 21))
->Array : Symbol(Array, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.symbol.wellknown.d.ts, --, --) ... and 4 more)
+>Array : Symbol(Array, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.symbol.wellknown.d.ts, --, --) ... and 5 more)
 >A : Symbol(A, Decl(recursiveConditionalTypes.ts, 151, 21))
 >T : Symbol(T, Decl(recursiveConditionalTypes.ts, 151, 74))
 
@@ -586,7 +586,7 @@ type _PrependNextNum<A extends Array<unknown>> = A['length'] extends infer T
 type _Enumerate<A extends Array<unknown>, N extends number> = N extends A['length']
 >_Enumerate : Symbol(_Enumerate, Decl(recursiveConditionalTypes.ts, 155, 12))
 >A : Symbol(A, Decl(recursiveConditionalTypes.ts, 157, 16))
->Array : Symbol(Array, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.symbol.wellknown.d.ts, --, --) ... and 4 more)
+>Array : Symbol(Array, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.symbol.wellknown.d.ts, --, --) ... and 5 more)
 >N : Symbol(N, Decl(recursiveConditionalTypes.ts, 157, 41))
 >N : Symbol(N, Decl(recursiveConditionalTypes.ts, 157, 41))
 >A : Symbol(A, Decl(recursiveConditionalTypes.ts, 157, 16))
diff --git a/tests/baselines/reference/taggedTemplatesWithTypeArguments1.symbols b/tests/baselines/reference/taggedTemplatesWithTypeArguments1.symbols
index c89c6bb054768..fa7f75d4a3a06 100644
--- a/tests/baselines/reference/taggedTemplatesWithTypeArguments1.symbols
+++ b/tests/baselines/reference/taggedTemplatesWithTypeArguments1.symbols
@@ -7,7 +7,7 @@ declare function f<T>(strs: TemplateStringsArray, ...callbacks: Array<(x: T) =>
 >strs : Symbol(strs, Decl(taggedTemplatesWithTypeArguments1.ts, 0, 22))
 >TemplateStringsArray : Symbol(TemplateStringsArray, Decl(lib.es5.d.ts, --, --))
 >callbacks : Symbol(callbacks, Decl(taggedTemplatesWithTypeArguments1.ts, 0, 49))
->Array : Symbol(Array, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.symbol.wellknown.d.ts, --, --) ... and 4 more)
+>Array : Symbol(Array, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.symbol.wellknown.d.ts, --, --) ... and 5 more)
 >x : Symbol(x, Decl(taggedTemplatesWithTypeArguments1.ts, 0, 71))
 >T : Symbol(T, Decl(taggedTemplatesWithTypeArguments1.ts, 0, 19))
 
diff --git a/tests/baselines/reference/tsc/runWithoutArgs/does-not-add-color-when-NO_COLOR-is-set.js b/tests/baselines/reference/tsc/runWithoutArgs/does-not-add-color-when-NO_COLOR-is-set.js
index 97c9057dd03b3..8201ec9ce247e 100644
--- a/tests/baselines/reference/tsc/runWithoutArgs/does-not-add-color-when-NO_COLOR-is-set.js
+++ b/tests/baselines/reference/tsc/runWithoutArgs/does-not-add-color-when-NO_COLOR-is-set.js
@@ -111,7 +111,7 @@ default: undefined
 
 --lib
 Specify a set of bundled library declaration files that describe the target runtime environment.
-one or more: es5, es6/es2015, es7/es2016, es2017, es2018, es2019, es2020, es2021, es2022, es2023, esnext, dom, dom.iterable, dom.asynciterable, webworker, webworker.importscripts, webworker.iterable, webworker.asynciterable, scripthost, es2015.core, es2015.collection, es2015.generator, es2015.iterable, es2015.promise, es2015.proxy, es2015.reflect, es2015.symbol, es2015.symbol.wellknown, es2016.array.include, es2016.intl, es2017.date, es2017.object, es2017.sharedmemory, es2017.string, es2017.intl, es2017.typedarrays, es2018.asyncgenerator, es2018.asynciterable/esnext.asynciterable, es2018.intl, es2018.promise, es2018.regexp, es2019.array, es2019.object, es2019.string, es2019.symbol/esnext.symbol, es2019.intl, es2020.bigint/esnext.bigint, es2020.date, es2020.promise, es2020.sharedmemory, es2020.string, es2020.symbol.wellknown, es2020.intl, es2020.number, es2021.promise, es2021.string, es2021.weakref/esnext.weakref, es2021.intl, es2022.array, es2022.error, es2022.intl, es2022.object, es2022.sharedmemory, es2022.string/esnext.string, es2022.regexp, es2023.array, es2023.collection, es2023.intl, esnext.array, esnext.collection, esnext.intl, esnext.disposable, esnext.promise, esnext.decorators, esnext.object, esnext.regexp, decorators, decorators.legacy
+one or more: es5, es6/es2015, es7/es2016, es2017, es2018, es2019, es2020, es2021, es2022, es2023, esnext, dom, dom.iterable, dom.asynciterable, webworker, webworker.importscripts, webworker.iterable, webworker.asynciterable, scripthost, es2015.core, es2015.collection, es2015.generator, es2015.iterable, es2015.promise, es2015.proxy, es2015.reflect, es2015.symbol, es2015.symbol.wellknown, es2016.array.include, es2016.intl, es2017.date, es2017.object, es2017.sharedmemory, es2017.string, es2017.intl, es2017.typedarrays, es2018.asyncgenerator, es2018.asynciterable/esnext.asynciterable, es2018.intl, es2018.promise, es2018.regexp, es2019.array, es2019.object, es2019.string, es2019.symbol/esnext.symbol, es2019.intl, es2020.bigint/esnext.bigint, es2020.date, es2020.promise, es2020.sharedmemory, es2020.string, es2020.symbol.wellknown, es2020.intl, es2020.number, es2021.promise, es2021.string, es2021.weakref/esnext.weakref, es2021.intl, es2022.array, es2022.error, es2022.intl, es2022.object, es2022.sharedmemory, es2022.string/esnext.string, es2022.regexp, es2023.array, es2023.collection, es2023.intl, esnext.array, esnext.collection, esnext.intl, esnext.disposable, esnext.promise, esnext.decorators, esnext.object, esnext.regexp, esnext.iterator, decorators, decorators.legacy
 default: undefined
 
 --allowJs
diff --git a/tests/baselines/reference/tsc/runWithoutArgs/show-help-with-ExitStatus.DiagnosticsPresent_OutputsSkipped-when-host-can't-provide-terminal-width.js b/tests/baselines/reference/tsc/runWithoutArgs/show-help-with-ExitStatus.DiagnosticsPresent_OutputsSkipped-when-host-can't-provide-terminal-width.js
index 8191f56bbf51a..5da7c419d54b2 100644
--- a/tests/baselines/reference/tsc/runWithoutArgs/show-help-with-ExitStatus.DiagnosticsPresent_OutputsSkipped-when-host-can't-provide-terminal-width.js
+++ b/tests/baselines/reference/tsc/runWithoutArgs/show-help-with-ExitStatus.DiagnosticsPresent_OutputsSkipped-when-host-can't-provide-terminal-width.js
@@ -111,7 +111,7 @@ default: undefined
 
 --lib
 Specify a set of bundled library declaration files that describe the target runtime environment.
-one or more: es5, es6/es2015, es7/es2016, es2017, es2018, es2019, es2020, es2021, es2022, es2023, esnext, dom, dom.iterable, dom.asynciterable, webworker, webworker.importscripts, webworker.iterable, webworker.asynciterable, scripthost, es2015.core, es2015.collection, es2015.generator, es2015.iterable, es2015.promise, es2015.proxy, es2015.reflect, es2015.symbol, es2015.symbol.wellknown, es2016.array.include, es2016.intl, es2017.date, es2017.object, es2017.sharedmemory, es2017.string, es2017.intl, es2017.typedarrays, es2018.asyncgenerator, es2018.asynciterable/esnext.asynciterable, es2018.intl, es2018.promise, es2018.regexp, es2019.array, es2019.object, es2019.string, es2019.symbol/esnext.symbol, es2019.intl, es2020.bigint/esnext.bigint, es2020.date, es2020.promise, es2020.sharedmemory, es2020.string, es2020.symbol.wellknown, es2020.intl, es2020.number, es2021.promise, es2021.string, es2021.weakref/esnext.weakref, es2021.intl, es2022.array, es2022.error, es2022.intl, es2022.object, es2022.sharedmemory, es2022.string/esnext.string, es2022.regexp, es2023.array, es2023.collection, es2023.intl, esnext.array, esnext.collection, esnext.intl, esnext.disposable, esnext.promise, esnext.decorators, esnext.object, esnext.regexp, decorators, decorators.legacy
+one or more: es5, es6/es2015, es7/es2016, es2017, es2018, es2019, es2020, es2021, es2022, es2023, esnext, dom, dom.iterable, dom.asynciterable, webworker, webworker.importscripts, webworker.iterable, webworker.asynciterable, scripthost, es2015.core, es2015.collection, es2015.generator, es2015.iterable, es2015.promise, es2015.proxy, es2015.reflect, es2015.symbol, es2015.symbol.wellknown, es2016.array.include, es2016.intl, es2017.date, es2017.object, es2017.sharedmemory, es2017.string, es2017.intl, es2017.typedarrays, es2018.asyncgenerator, es2018.asynciterable/esnext.asynciterable, es2018.intl, es2018.promise, es2018.regexp, es2019.array, es2019.object, es2019.string, es2019.symbol/esnext.symbol, es2019.intl, es2020.bigint/esnext.bigint, es2020.date, es2020.promise, es2020.sharedmemory, es2020.string, es2020.symbol.wellknown, es2020.intl, es2020.number, es2021.promise, es2021.string, es2021.weakref/esnext.weakref, es2021.intl, es2022.array, es2022.error, es2022.intl, es2022.object, es2022.sharedmemory, es2022.string/esnext.string, es2022.regexp, es2023.array, es2023.collection, es2023.intl, esnext.array, esnext.collection, esnext.intl, esnext.disposable, esnext.promise, esnext.decorators, esnext.object, esnext.regexp, esnext.iterator, decorators, decorators.legacy
 default: undefined
 
 --allowJs
diff --git a/tests/baselines/reference/tsc/runWithoutArgs/show-help-with-ExitStatus.DiagnosticsPresent_OutputsSkipped.js b/tests/baselines/reference/tsc/runWithoutArgs/show-help-with-ExitStatus.DiagnosticsPresent_OutputsSkipped.js
index 8191f56bbf51a..5da7c419d54b2 100644
--- a/tests/baselines/reference/tsc/runWithoutArgs/show-help-with-ExitStatus.DiagnosticsPresent_OutputsSkipped.js
+++ b/tests/baselines/reference/tsc/runWithoutArgs/show-help-with-ExitStatus.DiagnosticsPresent_OutputsSkipped.js
@@ -111,7 +111,7 @@ default: undefined
 
 --lib
 Specify a set of bundled library declaration files that describe the target runtime environment.
-one or more: es5, es6/es2015, es7/es2016, es2017, es2018, es2019, es2020, es2021, es2022, es2023, esnext, dom, dom.iterable, dom.asynciterable, webworker, webworker.importscripts, webworker.iterable, webworker.asynciterable, scripthost, es2015.core, es2015.collection, es2015.generator, es2015.iterable, es2015.promise, es2015.proxy, es2015.reflect, es2015.symbol, es2015.symbol.wellknown, es2016.array.include, es2016.intl, es2017.date, es2017.object, es2017.sharedmemory, es2017.string, es2017.intl, es2017.typedarrays, es2018.asyncgenerator, es2018.asynciterable/esnext.asynciterable, es2018.intl, es2018.promise, es2018.regexp, es2019.array, es2019.object, es2019.string, es2019.symbol/esnext.symbol, es2019.intl, es2020.bigint/esnext.bigint, es2020.date, es2020.promise, es2020.sharedmemory, es2020.string, es2020.symbol.wellknown, es2020.intl, es2020.number, es2021.promise, es2021.string, es2021.weakref/esnext.weakref, es2021.intl, es2022.array, es2022.error, es2022.intl, es2022.object, es2022.sharedmemory, es2022.string/esnext.string, es2022.regexp, es2023.array, es2023.collection, es2023.intl, esnext.array, esnext.collection, esnext.intl, esnext.disposable, esnext.promise, esnext.decorators, esnext.object, esnext.regexp, decorators, decorators.legacy
+one or more: es5, es6/es2015, es7/es2016, es2017, es2018, es2019, es2020, es2021, es2022, es2023, esnext, dom, dom.iterable, dom.asynciterable, webworker, webworker.importscripts, webworker.iterable, webworker.asynciterable, scripthost, es2015.core, es2015.collection, es2015.generator, es2015.iterable, es2015.promise, es2015.proxy, es2015.reflect, es2015.symbol, es2015.symbol.wellknown, es2016.array.include, es2016.intl, es2017.date, es2017.object, es2017.sharedmemory, es2017.string, es2017.intl, es2017.typedarrays, es2018.asyncgenerator, es2018.asynciterable/esnext.asynciterable, es2018.intl, es2018.promise, es2018.regexp, es2019.array, es2019.object, es2019.string, es2019.symbol/esnext.symbol, es2019.intl, es2020.bigint/esnext.bigint, es2020.date, es2020.promise, es2020.sharedmemory, es2020.string, es2020.symbol.wellknown, es2020.intl, es2020.number, es2021.promise, es2021.string, es2021.weakref/esnext.weakref, es2021.intl, es2022.array, es2022.error, es2022.intl, es2022.object, es2022.sharedmemory, es2022.string/esnext.string, es2022.regexp, es2023.array, es2023.collection, es2023.intl, esnext.array, esnext.collection, esnext.intl, esnext.disposable, esnext.promise, esnext.decorators, esnext.object, esnext.regexp, esnext.iterator, decorators, decorators.legacy
 default: undefined
 
 --allowJs
diff --git a/tests/baselines/reference/tsserver/telemetry/does-not-expose-paths.js b/tests/baselines/reference/tsserver/telemetry/does-not-expose-paths.js
index 19c33189826f8..6ff4987c1957c 100644
--- a/tests/baselines/reference/tsserver/telemetry/does-not-expose-paths.js
+++ b/tests/baselines/reference/tsserver/telemetry/does-not-expose-paths.js
@@ -443,7 +443,7 @@ Info seq  [hh:mm:ss:mss] event:
               "line": 34,
               "offset": 16
             },
-            "text": "Argument for '--lib' option must be: 'es5', 'es6', 'es2015', 'es7', 'es2016', 'es2017', 'es2018', 'es2019', 'es2020', 'es2021', 'es2022', 'es2023', 'esnext', 'dom', 'dom.iterable', 'dom.asynciterable', 'webworker', 'webworker.importscripts', 'webworker.iterable', 'webworker.asynciterable', 'scripthost', 'es2015.core', 'es2015.collection', 'es2015.generator', 'es2015.iterable', 'es2015.promise', 'es2015.proxy', 'es2015.reflect', 'es2015.symbol', 'es2015.symbol.wellknown', 'es2016.array.include', 'es2016.intl', 'es2017.date', 'es2017.object', 'es2017.sharedmemory', 'es2017.string', 'es2017.intl', 'es2017.typedarrays', 'es2018.asyncgenerator', 'es2018.asynciterable', 'es2018.intl', 'es2018.promise', 'es2018.regexp', 'es2019.array', 'es2019.object', 'es2019.string', 'es2019.symbol', 'es2019.intl', 'es2020.bigint', 'es2020.date', 'es2020.promise', 'es2020.sharedmemory', 'es2020.string', 'es2020.symbol.wellknown', 'es2020.intl', 'es2020.number', 'es2021.promise', 'es2021.string', 'es2021.weakref', 'es2021.intl', 'es2022.array', 'es2022.error', 'es2022.intl', 'es2022.object', 'es2022.sharedmemory', 'es2022.string', 'es2022.regexp', 'es2023.array', 'es2023.collection', 'es2023.intl', 'esnext.array', 'esnext.collection', 'esnext.symbol', 'esnext.asynciterable', 'esnext.intl', 'esnext.disposable', 'esnext.bigint', 'esnext.string', 'esnext.promise', 'esnext.weakref', 'esnext.decorators', 'esnext.object', 'esnext.regexp', 'decorators', 'decorators.legacy'.",
+            "text": "Argument for '--lib' option must be: 'es5', 'es6', 'es2015', 'es7', 'es2016', 'es2017', 'es2018', 'es2019', 'es2020', 'es2021', 'es2022', 'es2023', 'esnext', 'dom', 'dom.iterable', 'dom.asynciterable', 'webworker', 'webworker.importscripts', 'webworker.iterable', 'webworker.asynciterable', 'scripthost', 'es2015.core', 'es2015.collection', 'es2015.generator', 'es2015.iterable', 'es2015.promise', 'es2015.proxy', 'es2015.reflect', 'es2015.symbol', 'es2015.symbol.wellknown', 'es2016.array.include', 'es2016.intl', 'es2017.date', 'es2017.object', 'es2017.sharedmemory', 'es2017.string', 'es2017.intl', 'es2017.typedarrays', 'es2018.asyncgenerator', 'es2018.asynciterable', 'es2018.intl', 'es2018.promise', 'es2018.regexp', 'es2019.array', 'es2019.object', 'es2019.string', 'es2019.symbol', 'es2019.intl', 'es2020.bigint', 'es2020.date', 'es2020.promise', 'es2020.sharedmemory', 'es2020.string', 'es2020.symbol.wellknown', 'es2020.intl', 'es2020.number', 'es2021.promise', 'es2021.string', 'es2021.weakref', 'es2021.intl', 'es2022.array', 'es2022.error', 'es2022.intl', 'es2022.object', 'es2022.sharedmemory', 'es2022.string', 'es2022.regexp', 'es2023.array', 'es2023.collection', 'es2023.intl', 'esnext.array', 'esnext.collection', 'esnext.symbol', 'esnext.asynciterable', 'esnext.intl', 'esnext.disposable', 'esnext.bigint', 'esnext.string', 'esnext.promise', 'esnext.weakref', 'esnext.decorators', 'esnext.object', 'esnext.regexp', 'esnext.iterator', 'decorators', 'decorators.legacy'.",
             "code": 6046,
             "category": "error",
             "fileName": "/tsconfig.json"
diff --git a/tests/baselines/reference/typeGuardConstructorNarrowAny.symbols b/tests/baselines/reference/typeGuardConstructorNarrowAny.symbols
index fc87ef85dfbd2..c9cac7f250e6c 100644
--- a/tests/baselines/reference/typeGuardConstructorNarrowAny.symbols
+++ b/tests/baselines/reference/typeGuardConstructorNarrowAny.symbols
@@ -28,7 +28,7 @@ if (var1.constructor === Boolean) {
 }
 if (var1.constructor === Array) {
 >var1 : Symbol(var1, Decl(typeGuardConstructorNarrowAny.ts, 1, 3))
->Array : Symbol(Array, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.symbol.wellknown.d.ts, --, --) ... and 4 more)
+>Array : Symbol(Array, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.symbol.wellknown.d.ts, --, --) ... and 5 more)
 
     var1; // any[]
 >var1 : Symbol(var1, Decl(typeGuardConstructorNarrowAny.ts, 1, 3))
diff --git a/tests/baselines/reference/typeGuardConstructorPrimitiveTypes.symbols b/tests/baselines/reference/typeGuardConstructorPrimitiveTypes.symbols
index d3f4a65bfcf54..5e773fc713477 100644
--- a/tests/baselines/reference/typeGuardConstructorPrimitiveTypes.symbols
+++ b/tests/baselines/reference/typeGuardConstructorPrimitiveTypes.symbols
@@ -36,7 +36,7 @@ if (var1.constructor === Array) {
 >var1.constructor : Symbol(Object.constructor, Decl(lib.es5.d.ts, --, --))
 >var1 : Symbol(var1, Decl(typeGuardConstructorPrimitiveTypes.ts, 1, 3))
 >constructor : Symbol(Object.constructor, Decl(lib.es5.d.ts, --, --))
->Array : Symbol(Array, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.symbol.wellknown.d.ts, --, --) ... and 4 more)
+>Array : Symbol(Array, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.symbol.wellknown.d.ts, --, --) ... and 5 more)
 
     var1; // any[]
 >var1 : Symbol(var1, Decl(typeGuardConstructorPrimitiveTypes.ts, 1, 3))
diff --git a/tests/baselines/reference/typeOfYieldWithUnionInContextualReturnType.symbols b/tests/baselines/reference/typeOfYieldWithUnionInContextualReturnType.symbols
index 5bfb0cb71fe9d..95a3bfc3c0ba0 100644
--- a/tests/baselines/reference/typeOfYieldWithUnionInContextualReturnType.symbols
+++ b/tests/baselines/reference/typeOfYieldWithUnionInContextualReturnType.symbols
@@ -5,7 +5,7 @@
 
 type SyncSequenceFactory = () => Generator<string, string, string>;
 >SyncSequenceFactory : Symbol(SyncSequenceFactory, Decl(typeOfYieldWithUnionInContextualReturnType.ts, 0, 0))
->Generator : Symbol(Generator, Decl(lib.es2015.generator.d.ts, --, --))
+>Generator : Symbol(Generator, Decl(lib.es2015.generator.d.ts, --, --), Decl(lib.esnext.iterator.d.ts, --, --))
 
 type AsyncSequenceFactory = () => AsyncGenerator<string, string, string>;
 >AsyncSequenceFactory : Symbol(AsyncSequenceFactory, Decl(typeOfYieldWithUnionInContextualReturnType.ts, 2, 67))
diff --git a/tests/baselines/reference/types.asyncGenerators.es2018.2.symbols b/tests/baselines/reference/types.asyncGenerators.es2018.2.symbols
index 5fc37ff0791b9..ec2eea8b3b443 100644
--- a/tests/baselines/reference/types.asyncGenerators.es2018.2.symbols
+++ b/tests/baselines/reference/types.asyncGenerators.es2018.2.symbols
@@ -142,7 +142,7 @@ async function * explicitReturnType11(): Iterable<number> {
 }
 async function * explicitReturnType12(): Iterator<number> {
 >explicitReturnType12 : Symbol(explicitReturnType12, Decl(types.asyncGenerators.es2018.2.ts, 68, 1))
->Iterator : Symbol(Iterator, Decl(lib.es2015.iterable.d.ts, --, --))
+>Iterator : Symbol(Iterator, Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.esnext.iterator.d.ts, --, --))
 
     yield 1;
 }
diff --git a/tests/baselines/reference/typesVersions.ambientModules.trace.json b/tests/baselines/reference/typesVersions.ambientModules.trace.json
index d1db5bcce72c1..f1bf85fcff11b 100644
--- a/tests/baselines/reference/typesVersions.ambientModules.trace.json
+++ b/tests/baselines/reference/typesVersions.ambientModules.trace.json
@@ -1058,6 +1058,20 @@
     "======== Module name '@typescript/lib-esnext/regexp' was not resolved. ========",
     "File '/.ts/package.json' does not exist according to earlier cached lookups.",
     "File '/package.json' does not exist according to earlier cached lookups.",
+    "======== Resolving module '@typescript/lib-esnext/iterator' from '/.src/__lib_node_modules_lookup_lib.esnext.iterator.d.ts__.ts'. ========",
+    "Explicitly specified module resolution kind: 'Node10'.",
+    "Loading module '@typescript/lib-esnext/iterator' from 'node_modules' folder, target file types: TypeScript, Declaration.",
+    "Searching all ancestor node_modules directories for preferred extensions: TypeScript, Declaration.",
+    "Directory '/.src/node_modules/@types' does not exist, skipping all lookups in it.",
+    "Scoped package detected, looking in 'typescript__lib-esnext/iterator'",
+    "Directory '/node_modules' does not exist, skipping all lookups in it.",
+    "Scoped package detected, looking in 'typescript__lib-esnext/iterator'",
+    "Loading module '@typescript/lib-esnext/iterator' from 'node_modules' folder, target file types: JavaScript.",
+    "Searching all ancestor node_modules directories for fallback extensions: JavaScript.",
+    "Directory '/node_modules' does not exist, skipping all lookups in it.",
+    "======== Module name '@typescript/lib-esnext/iterator' was not resolved. ========",
+    "File '/.ts/package.json' does not exist according to earlier cached lookups.",
+    "File '/package.json' does not exist according to earlier cached lookups.",
     "======== Resolving module '@typescript/lib-dom' from '/.src/__lib_node_modules_lookup_lib.dom.d.ts__.ts'. ========",
     "Explicitly specified module resolution kind: 'Node10'.",
     "Loading module '@typescript/lib-dom' from 'node_modules' folder, target file types: TypeScript, Declaration.",
diff --git a/tests/baselines/reference/typesVersions.emptyTypes.trace.json b/tests/baselines/reference/typesVersions.emptyTypes.trace.json
index 329da7de27ea8..0112ce90ea1be 100644
--- a/tests/baselines/reference/typesVersions.emptyTypes.trace.json
+++ b/tests/baselines/reference/typesVersions.emptyTypes.trace.json
@@ -1076,6 +1076,21 @@
     "======== Module name '@typescript/lib-esnext/regexp' was not resolved. ========",
     "File '/.ts/package.json' does not exist according to earlier cached lookups.",
     "File '/package.json' does not exist according to earlier cached lookups.",
+    "======== Resolving module '@typescript/lib-esnext/iterator' from '/.src/__lib_node_modules_lookup_lib.esnext.iterator.d.ts__.ts'. ========",
+    "Explicitly specified module resolution kind: 'Node10'.",
+    "Loading module '@typescript/lib-esnext/iterator' from 'node_modules' folder, target file types: TypeScript, Declaration.",
+    "Searching all ancestor node_modules directories for preferred extensions: TypeScript, Declaration.",
+    "Directory '/.src/node_modules' does not exist, skipping all lookups in it.",
+    "Scoped package detected, looking in 'typescript__lib-esnext/iterator'",
+    "Directory '/node_modules' does not exist, skipping all lookups in it.",
+    "Scoped package detected, looking in 'typescript__lib-esnext/iterator'",
+    "Loading module '@typescript/lib-esnext/iterator' from 'node_modules' folder, target file types: JavaScript.",
+    "Searching all ancestor node_modules directories for fallback extensions: JavaScript.",
+    "Directory '/.src/node_modules' does not exist, skipping all lookups in it.",
+    "Directory '/node_modules' does not exist, skipping all lookups in it.",
+    "======== Module name '@typescript/lib-esnext/iterator' was not resolved. ========",
+    "File '/.ts/package.json' does not exist according to earlier cached lookups.",
+    "File '/package.json' does not exist according to earlier cached lookups.",
     "======== Resolving module '@typescript/lib-dom' from '/.src/__lib_node_modules_lookup_lib.dom.d.ts__.ts'. ========",
     "Explicitly specified module resolution kind: 'Node10'.",
     "Loading module '@typescript/lib-dom' from 'node_modules' folder, target file types: TypeScript, Declaration.",
diff --git a/tests/baselines/reference/typesVersions.justIndex.trace.json b/tests/baselines/reference/typesVersions.justIndex.trace.json
index 107cb19c7d5c9..5d94e0a04d8fa 100644
--- a/tests/baselines/reference/typesVersions.justIndex.trace.json
+++ b/tests/baselines/reference/typesVersions.justIndex.trace.json
@@ -1076,6 +1076,21 @@
     "======== Module name '@typescript/lib-esnext/regexp' was not resolved. ========",
     "File '/.ts/package.json' does not exist according to earlier cached lookups.",
     "File '/package.json' does not exist according to earlier cached lookups.",
+    "======== Resolving module '@typescript/lib-esnext/iterator' from '/.src/__lib_node_modules_lookup_lib.esnext.iterator.d.ts__.ts'. ========",
+    "Explicitly specified module resolution kind: 'Node10'.",
+    "Loading module '@typescript/lib-esnext/iterator' from 'node_modules' folder, target file types: TypeScript, Declaration.",
+    "Searching all ancestor node_modules directories for preferred extensions: TypeScript, Declaration.",
+    "Directory '/.src/node_modules' does not exist, skipping all lookups in it.",
+    "Scoped package detected, looking in 'typescript__lib-esnext/iterator'",
+    "Directory '/node_modules' does not exist, skipping all lookups in it.",
+    "Scoped package detected, looking in 'typescript__lib-esnext/iterator'",
+    "Loading module '@typescript/lib-esnext/iterator' from 'node_modules' folder, target file types: JavaScript.",
+    "Searching all ancestor node_modules directories for fallback extensions: JavaScript.",
+    "Directory '/.src/node_modules' does not exist, skipping all lookups in it.",
+    "Directory '/node_modules' does not exist, skipping all lookups in it.",
+    "======== Module name '@typescript/lib-esnext/iterator' was not resolved. ========",
+    "File '/.ts/package.json' does not exist according to earlier cached lookups.",
+    "File '/package.json' does not exist according to earlier cached lookups.",
     "======== Resolving module '@typescript/lib-dom' from '/.src/__lib_node_modules_lookup_lib.dom.d.ts__.ts'. ========",
     "Explicitly specified module resolution kind: 'Node10'.",
     "Loading module '@typescript/lib-dom' from 'node_modules' folder, target file types: TypeScript, Declaration.",
diff --git a/tests/baselines/reference/typesVersions.multiFile.trace.json b/tests/baselines/reference/typesVersions.multiFile.trace.json
index 42f5b7cbf0fc3..20bc9012a3f4e 100644
--- a/tests/baselines/reference/typesVersions.multiFile.trace.json
+++ b/tests/baselines/reference/typesVersions.multiFile.trace.json
@@ -1021,6 +1021,20 @@
     "======== Module name '@typescript/lib-esnext/regexp' was not resolved. ========",
     "File '/.ts/package.json' does not exist according to earlier cached lookups.",
     "File '/package.json' does not exist according to earlier cached lookups.",
+    "======== Resolving module '@typescript/lib-esnext/iterator' from '/.src/__lib_node_modules_lookup_lib.esnext.iterator.d.ts__.ts'. ========",
+    "Explicitly specified module resolution kind: 'Node10'.",
+    "Loading module '@typescript/lib-esnext/iterator' from 'node_modules' folder, target file types: TypeScript, Declaration.",
+    "Searching all ancestor node_modules directories for preferred extensions: TypeScript, Declaration.",
+    "Directory '/.src/node_modules/@types' does not exist, skipping all lookups in it.",
+    "Scoped package detected, looking in 'typescript__lib-esnext/iterator'",
+    "Directory '/node_modules' does not exist, skipping all lookups in it.",
+    "Scoped package detected, looking in 'typescript__lib-esnext/iterator'",
+    "Loading module '@typescript/lib-esnext/iterator' from 'node_modules' folder, target file types: JavaScript.",
+    "Searching all ancestor node_modules directories for fallback extensions: JavaScript.",
+    "Directory '/node_modules' does not exist, skipping all lookups in it.",
+    "======== Module name '@typescript/lib-esnext/iterator' was not resolved. ========",
+    "File '/.ts/package.json' does not exist according to earlier cached lookups.",
+    "File '/package.json' does not exist according to earlier cached lookups.",
     "======== Resolving module '@typescript/lib-dom' from '/.src/__lib_node_modules_lookup_lib.dom.d.ts__.ts'. ========",
     "Explicitly specified module resolution kind: 'Node10'.",
     "Loading module '@typescript/lib-dom' from 'node_modules' folder, target file types: TypeScript, Declaration.",
diff --git a/tests/baselines/reference/typesVersionsDeclarationEmit.ambient.trace.json b/tests/baselines/reference/typesVersionsDeclarationEmit.ambient.trace.json
index d1db5bcce72c1..f1bf85fcff11b 100644
--- a/tests/baselines/reference/typesVersionsDeclarationEmit.ambient.trace.json
+++ b/tests/baselines/reference/typesVersionsDeclarationEmit.ambient.trace.json
@@ -1058,6 +1058,20 @@
     "======== Module name '@typescript/lib-esnext/regexp' was not resolved. ========",
     "File '/.ts/package.json' does not exist according to earlier cached lookups.",
     "File '/package.json' does not exist according to earlier cached lookups.",
+    "======== Resolving module '@typescript/lib-esnext/iterator' from '/.src/__lib_node_modules_lookup_lib.esnext.iterator.d.ts__.ts'. ========",
+    "Explicitly specified module resolution kind: 'Node10'.",
+    "Loading module '@typescript/lib-esnext/iterator' from 'node_modules' folder, target file types: TypeScript, Declaration.",
+    "Searching all ancestor node_modules directories for preferred extensions: TypeScript, Declaration.",
+    "Directory '/.src/node_modules/@types' does not exist, skipping all lookups in it.",
+    "Scoped package detected, looking in 'typescript__lib-esnext/iterator'",
+    "Directory '/node_modules' does not exist, skipping all lookups in it.",
+    "Scoped package detected, looking in 'typescript__lib-esnext/iterator'",
+    "Loading module '@typescript/lib-esnext/iterator' from 'node_modules' folder, target file types: JavaScript.",
+    "Searching all ancestor node_modules directories for fallback extensions: JavaScript.",
+    "Directory '/node_modules' does not exist, skipping all lookups in it.",
+    "======== Module name '@typescript/lib-esnext/iterator' was not resolved. ========",
+    "File '/.ts/package.json' does not exist according to earlier cached lookups.",
+    "File '/package.json' does not exist according to earlier cached lookups.",
     "======== Resolving module '@typescript/lib-dom' from '/.src/__lib_node_modules_lookup_lib.dom.d.ts__.ts'. ========",
     "Explicitly specified module resolution kind: 'Node10'.",
     "Loading module '@typescript/lib-dom' from 'node_modules' folder, target file types: TypeScript, Declaration.",
diff --git a/tests/baselines/reference/typesVersionsDeclarationEmit.multiFile.trace.json b/tests/baselines/reference/typesVersionsDeclarationEmit.multiFile.trace.json
index 42f5b7cbf0fc3..20bc9012a3f4e 100644
--- a/tests/baselines/reference/typesVersionsDeclarationEmit.multiFile.trace.json
+++ b/tests/baselines/reference/typesVersionsDeclarationEmit.multiFile.trace.json
@@ -1021,6 +1021,20 @@
     "======== Module name '@typescript/lib-esnext/regexp' was not resolved. ========",
     "File '/.ts/package.json' does not exist according to earlier cached lookups.",
     "File '/package.json' does not exist according to earlier cached lookups.",
+    "======== Resolving module '@typescript/lib-esnext/iterator' from '/.src/__lib_node_modules_lookup_lib.esnext.iterator.d.ts__.ts'. ========",
+    "Explicitly specified module resolution kind: 'Node10'.",
+    "Loading module '@typescript/lib-esnext/iterator' from 'node_modules' folder, target file types: TypeScript, Declaration.",
+    "Searching all ancestor node_modules directories for preferred extensions: TypeScript, Declaration.",
+    "Directory '/.src/node_modules/@types' does not exist, skipping all lookups in it.",
+    "Scoped package detected, looking in 'typescript__lib-esnext/iterator'",
+    "Directory '/node_modules' does not exist, skipping all lookups in it.",
+    "Scoped package detected, looking in 'typescript__lib-esnext/iterator'",
+    "Loading module '@typescript/lib-esnext/iterator' from 'node_modules' folder, target file types: JavaScript.",
+    "Searching all ancestor node_modules directories for fallback extensions: JavaScript.",
+    "Directory '/node_modules' does not exist, skipping all lookups in it.",
+    "======== Module name '@typescript/lib-esnext/iterator' was not resolved. ========",
+    "File '/.ts/package.json' does not exist according to earlier cached lookups.",
+    "File '/package.json' does not exist according to earlier cached lookups.",
     "======== Resolving module '@typescript/lib-dom' from '/.src/__lib_node_modules_lookup_lib.dom.d.ts__.ts'. ========",
     "Explicitly specified module resolution kind: 'Node10'.",
     "Loading module '@typescript/lib-dom' from 'node_modules' folder, target file types: TypeScript, Declaration.",
diff --git a/tests/baselines/reference/typesVersionsDeclarationEmit.multiFileBackReferenceToSelf.trace.json b/tests/baselines/reference/typesVersionsDeclarationEmit.multiFileBackReferenceToSelf.trace.json
index 774007ccd8a66..8e21e27a4469f 100644
--- a/tests/baselines/reference/typesVersionsDeclarationEmit.multiFileBackReferenceToSelf.trace.json
+++ b/tests/baselines/reference/typesVersionsDeclarationEmit.multiFileBackReferenceToSelf.trace.json
@@ -1044,6 +1044,20 @@
     "======== Module name '@typescript/lib-esnext/regexp' was not resolved. ========",
     "File '/.ts/package.json' does not exist according to earlier cached lookups.",
     "File '/package.json' does not exist according to earlier cached lookups.",
+    "======== Resolving module '@typescript/lib-esnext/iterator' from '/.src/__lib_node_modules_lookup_lib.esnext.iterator.d.ts__.ts'. ========",
+    "Explicitly specified module resolution kind: 'Node10'.",
+    "Loading module '@typescript/lib-esnext/iterator' from 'node_modules' folder, target file types: TypeScript, Declaration.",
+    "Searching all ancestor node_modules directories for preferred extensions: TypeScript, Declaration.",
+    "Directory '/.src/node_modules/@types' does not exist, skipping all lookups in it.",
+    "Scoped package detected, looking in 'typescript__lib-esnext/iterator'",
+    "Directory '/node_modules' does not exist, skipping all lookups in it.",
+    "Scoped package detected, looking in 'typescript__lib-esnext/iterator'",
+    "Loading module '@typescript/lib-esnext/iterator' from 'node_modules' folder, target file types: JavaScript.",
+    "Searching all ancestor node_modules directories for fallback extensions: JavaScript.",
+    "Directory '/node_modules' does not exist, skipping all lookups in it.",
+    "======== Module name '@typescript/lib-esnext/iterator' was not resolved. ========",
+    "File '/.ts/package.json' does not exist according to earlier cached lookups.",
+    "File '/package.json' does not exist according to earlier cached lookups.",
     "======== Resolving module '@typescript/lib-dom' from '/.src/__lib_node_modules_lookup_lib.dom.d.ts__.ts'. ========",
     "Explicitly specified module resolution kind: 'Node10'.",
     "Loading module '@typescript/lib-dom' from 'node_modules' folder, target file types: TypeScript, Declaration.",
diff --git a/tests/baselines/reference/typesVersionsDeclarationEmit.multiFileBackReferenceToUnmapped.trace.json b/tests/baselines/reference/typesVersionsDeclarationEmit.multiFileBackReferenceToUnmapped.trace.json
index 74258268ae864..a6f48a6af4e0a 100644
--- a/tests/baselines/reference/typesVersionsDeclarationEmit.multiFileBackReferenceToUnmapped.trace.json
+++ b/tests/baselines/reference/typesVersionsDeclarationEmit.multiFileBackReferenceToUnmapped.trace.json
@@ -1026,6 +1026,20 @@
     "======== Module name '@typescript/lib-esnext/regexp' was not resolved. ========",
     "File '/.ts/package.json' does not exist according to earlier cached lookups.",
     "File '/package.json' does not exist according to earlier cached lookups.",
+    "======== Resolving module '@typescript/lib-esnext/iterator' from '/.src/__lib_node_modules_lookup_lib.esnext.iterator.d.ts__.ts'. ========",
+    "Explicitly specified module resolution kind: 'Node10'.",
+    "Loading module '@typescript/lib-esnext/iterator' from 'node_modules' folder, target file types: TypeScript, Declaration.",
+    "Searching all ancestor node_modules directories for preferred extensions: TypeScript, Declaration.",
+    "Directory '/.src/node_modules/@types' does not exist, skipping all lookups in it.",
+    "Scoped package detected, looking in 'typescript__lib-esnext/iterator'",
+    "Directory '/node_modules' does not exist, skipping all lookups in it.",
+    "Scoped package detected, looking in 'typescript__lib-esnext/iterator'",
+    "Loading module '@typescript/lib-esnext/iterator' from 'node_modules' folder, target file types: JavaScript.",
+    "Searching all ancestor node_modules directories for fallback extensions: JavaScript.",
+    "Directory '/node_modules' does not exist, skipping all lookups in it.",
+    "======== Module name '@typescript/lib-esnext/iterator' was not resolved. ========",
+    "File '/.ts/package.json' does not exist according to earlier cached lookups.",
+    "File '/package.json' does not exist according to earlier cached lookups.",
     "======== Resolving module '@typescript/lib-dom' from '/.src/__lib_node_modules_lookup_lib.dom.d.ts__.ts'. ========",
     "Explicitly specified module resolution kind: 'Node10'.",
     "Loading module '@typescript/lib-dom' from 'node_modules' folder, target file types: TypeScript, Declaration.",
diff --git a/tests/baselines/reference/unionAndIntersectionInference3.symbols b/tests/baselines/reference/unionAndIntersectionInference3.symbols
index e84536ec7cc72..41531386e789d 100644
--- a/tests/baselines/reference/unionAndIntersectionInference3.symbols
+++ b/tests/baselines/reference/unionAndIntersectionInference3.symbols
@@ -29,7 +29,7 @@ const g: <U, R, S>(com: () => Iterator<S, U, R> | AsyncIterator<S, U, R>) => Pro
 >R : Symbol(R, Decl(unionAndIntersectionInference3.ts, 8, 12))
 >S : Symbol(S, Decl(unionAndIntersectionInference3.ts, 8, 15))
 >com : Symbol(com, Decl(unionAndIntersectionInference3.ts, 8, 19))
->Iterator : Symbol(Iterator, Decl(lib.es2015.iterable.d.ts, --, --))
+>Iterator : Symbol(Iterator, Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.esnext.iterator.d.ts, --, --))
 >S : Symbol(S, Decl(unionAndIntersectionInference3.ts, 8, 15))
 >U : Symbol(U, Decl(unionAndIntersectionInference3.ts, 8, 10))
 >R : Symbol(R, Decl(unionAndIntersectionInference3.ts, 8, 12))
@@ -43,7 +43,7 @@ const g: <U, R, S>(com: () => Iterator<S, U, R> | AsyncIterator<S, U, R>) => Pro
 >R : Symbol(R, Decl(unionAndIntersectionInference3.ts, 8, 99))
 >S : Symbol(S, Decl(unionAndIntersectionInference3.ts, 8, 102))
 >com : Symbol(com, Decl(unionAndIntersectionInference3.ts, 8, 106))
->Iterator : Symbol(Iterator, Decl(lib.es2015.iterable.d.ts, --, --))
+>Iterator : Symbol(Iterator, Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.esnext.iterator.d.ts, --, --))
 >S : Symbol(S, Decl(unionAndIntersectionInference3.ts, 8, 102))
 >U : Symbol(U, Decl(unionAndIntersectionInference3.ts, 8, 97))
 >R : Symbol(R, Decl(unionAndIntersectionInference3.ts, 8, 99))

From 4449c82dd9791f6a7c01b70d618a441af706e848 Mon Sep 17 00:00:00 2001
From: Kevin Gibbons <bakkot@gmail.com>
Date: Tue, 16 Apr 2024 20:00:58 -0700
Subject: [PATCH 3/9] format

---
 src/lib/esnext.iterator.d.ts | 267 +++++++++++++++++------------------
 1 file changed, 133 insertions(+), 134 deletions(-)

diff --git a/src/lib/esnext.iterator.d.ts b/src/lib/esnext.iterator.d.ts
index 01b74a6be0400..bcd4935c605a1 100644
--- a/src/lib/esnext.iterator.d.ts
+++ b/src/lib/esnext.iterator.d.ts
@@ -1,134 +1,133 @@
-interface NativeIterator<T, TReturn = void, TNext = undefined> extends Iterator<T, TReturn, TNext> {
-    /**
-     * Returns this iterator.
-     */
-    [Symbol.iterator](): NativeIterator<T, TReturn, TNext>;
-
-    /**
-     * Creates an iterator whose values are the result of applying the callback to the values from this iterator.
-     * @param callbackfn A function that accepts up to two arguments to be used to transform values from the underlying iterator.
-     */
-    map<U>(callbackfn: (value: T, index: number) => U): NativeIterator<U>;
-
-    /**
-     * Creates an iterator whose values are those from this iterator for which the provided predicate returns true.
-     * @param predicate A function that accepts up to two arguments to be used to test values from the underlying iterator.
-     */
-    filter<S extends T>(predicate: (value: T, index: number) => value is S): NativeIterator<S>;
-
-    /**
-     * Creates an iterator whose values are those from this iterator for which the provided predicate returns true.
-     * @param predicate A function that accepts up to two arguments to be used to test values from the underlying iterator.
-     */
-    filter(predicate: (value: T, index: number) => unknown): NativeIterator<T>;
-
-    /**
-     * Creates an iterator whose values are the values from this iterator, stopping once the provided limit is reached.
-     * @param limit The maximum number of values to yield.
-     */
-    take(limit: number): NativeIterator<T>;
-
-    /**
-     * Creates an iterator whose values are the values from this iterator after skipping the provided count.
-     * @param count The number of values to drop.
-     */
-    drop(count: number): NativeIterator<T>;
-
-    /**
-     * Creates an iterator whose values are the result of applying the callback to the values from this iterator and then flattening the resulting iterators or iterables.
-     * @param callback A function that accepts up to two arguments to be used to transform values from the underlying iterator into new iterators or iterables to be flattened into the result.
-     */
-    flatMap<U>(callback: (value: T, index: number) => (Iterator<U> | Iterable<U>)): NativeIterator<U>;
-
-    /**
-     * Calls the specified callback function for all the elements in this iterator. The return value of the callback function is the accumulated result, and is provided as an argument in the next call to the callback function.
-     * @param callbackfn A function that accepts up to three arguments. The reduce method calls the callbackfn function one time for each element in the iterator.
-     * @param initialValue If initialValue is specified, it is used as the initial value to start the accumulation. The first call to the callbackfn function provides this value as an argument instead of a value from the iterator.
-     */
-    reduce(callbackfn: (previousValue: T, currentValue: T, currentIndex: number) => T): T;
-    reduce(callbackfn: (previousValue: T, currentValue: T, currentIndex: number) => T, initialValue: T): T;
-
-    /**
-     * Calls the specified callback function for all the elements in this iterator. The return value of the callback function is the accumulated result, and is provided as an argument in the next call to the callback function.
-     * @param callbackfn A function that accepts up to three arguments. The reduce method calls the callbackfn function one time for each element in the iterator.
-     * @param initialValue If initialValue is specified, it is used as the initial value to start the accumulation. The first call to the callbackfn function provides this value as an argument instead of a value from the iterator.
-     */
-    reduce<U>(callbackfn: (previousValue: U, currentValue: T, currentIndex: number) => U, initialValue: U): U;
-
-    /**
-     * Creates a new array from the values yielded by this iterator.
-     */
-    toArray(): Array<T>;
-
-    /**
-     * Performs the specified action for each element in the iterator.
-     * @param callbackfn  A function that accepts up to two arguments. forEach calls the callbackfn function one time for each element in the iterator.
-     */
-    forEach(callbackfn: (value: T, index: number) => void): void;
-
-    /**
-     * Determines whether the specified callback function returns true for any element of this iterator.
-     * @param predicate A function that accepts up to two arguments. The some method calls
-     * the predicate function for each element in this iterator until the predicate returns a value
-     * true, or until the end of the iterator.
-     */
-    some(predicate: (value: T, index: number) => unknown): boolean;
-
-    /**
-     * Determines whether all the members of this iterator satisfy the specified test.
-     * @param predicate A function that accepts up to two arguments. The every method calls
-     * the predicate function for each element in this iterator until the predicate returns
-     * false, or until the end of this iterator.
-     */
-    every(predicate: (value: T, index: number) => unknown): boolean;
-
-    /**
-     * Returns the value of the first element in this iterator where predicate is true, and undefined
-     * otherwise.
-     * @param predicate find calls predicate once for each element of this iterator, in
-     * order, until it finds one where predicate returns true. If such an element is found, find
-     * immediately returns that element value. Otherwise, find returns undefined.
-     */
-    find<S extends T>(predicate: (value: T, index: number) => value is S): S | undefined;
-    find(predicate: (value: T, index: number) => unknown): T | undefined;
-
-    readonly [Symbol.toStringTag]: "Iterator";
-}
-
-interface IteratorConstructor {
-    /**
-     * Creates a native iterator from an iterator or iterable object.
-     * Returns its input if the input already inherits from the built-in Iterator class.
-     * @param value An iterator or iterable object to convert a native iterator.
-     */
-    from<T>(value: Iterator<T> | Iterable<T>): NativeIterator<T>;
-}
-
-declare var Iterator: (abstract new <T>() => NativeIterator<T>) & IteratorConstructor;
-
-
-// TODO BEFORE MERGING: update all existing IterableIterator-return methods to return NativeIterator
-// I have only done a couple so far, for illustration
-
-interface Generator<T = unknown, TReturn = any, TNext = unknown> extends NativeIterator<T, TReturn, TNext> {
-}
-
-interface Array<T> {
-    /** Iterator */
-    [Symbol.iterator](): NativeIterator<T>;
-
-    /**
-     * Returns an iterable iterator of key, value pairs for every entry in the array
-     */
-    entries(): NativeIterator<[number, T]>;
-
-    /**
-     * Returns an iterable iterator of keys in the array
-     */
-    keys(): NativeIterator<number>;
-
-    /**
-     * Returns an iterable iterator of values in the array
-     */
-    values(): NativeIterator<T>;
-}
+interface NativeIterator<T, TReturn = void, TNext = undefined> extends Iterator<T, TReturn, TNext> {
+    /**
+     * Returns this iterator.
+     */
+    [Symbol.iterator](): NativeIterator<T, TReturn, TNext>;
+
+    /**
+     * Creates an iterator whose values are the result of applying the callback to the values from this iterator.
+     * @param callbackfn A function that accepts up to two arguments to be used to transform values from the underlying iterator.
+     */
+    map<U>(callbackfn: (value: T, index: number) => U): NativeIterator<U>;
+
+    /**
+     * Creates an iterator whose values are those from this iterator for which the provided predicate returns true.
+     * @param predicate A function that accepts up to two arguments to be used to test values from the underlying iterator.
+     */
+    filter<S extends T>(predicate: (value: T, index: number) => value is S): NativeIterator<S>;
+
+    /**
+     * Creates an iterator whose values are those from this iterator for which the provided predicate returns true.
+     * @param predicate A function that accepts up to two arguments to be used to test values from the underlying iterator.
+     */
+    filter(predicate: (value: T, index: number) => unknown): NativeIterator<T>;
+
+    /**
+     * Creates an iterator whose values are the values from this iterator, stopping once the provided limit is reached.
+     * @param limit The maximum number of values to yield.
+     */
+    take(limit: number): NativeIterator<T>;
+
+    /**
+     * Creates an iterator whose values are the values from this iterator after skipping the provided count.
+     * @param count The number of values to drop.
+     */
+    drop(count: number): NativeIterator<T>;
+
+    /**
+     * Creates an iterator whose values are the result of applying the callback to the values from this iterator and then flattening the resulting iterators or iterables.
+     * @param callback A function that accepts up to two arguments to be used to transform values from the underlying iterator into new iterators or iterables to be flattened into the result.
+     */
+    flatMap<U>(callback: (value: T, index: number) => Iterator<U> | Iterable<U>): NativeIterator<U>;
+
+    /**
+     * Calls the specified callback function for all the elements in this iterator. The return value of the callback function is the accumulated result, and is provided as an argument in the next call to the callback function.
+     * @param callbackfn A function that accepts up to three arguments. The reduce method calls the callbackfn function one time for each element in the iterator.
+     * @param initialValue If initialValue is specified, it is used as the initial value to start the accumulation. The first call to the callbackfn function provides this value as an argument instead of a value from the iterator.
+     */
+    reduce(callbackfn: (previousValue: T, currentValue: T, currentIndex: number) => T): T;
+    reduce(callbackfn: (previousValue: T, currentValue: T, currentIndex: number) => T, initialValue: T): T;
+
+    /**
+     * Calls the specified callback function for all the elements in this iterator. The return value of the callback function is the accumulated result, and is provided as an argument in the next call to the callback function.
+     * @param callbackfn A function that accepts up to three arguments. The reduce method calls the callbackfn function one time for each element in the iterator.
+     * @param initialValue If initialValue is specified, it is used as the initial value to start the accumulation. The first call to the callbackfn function provides this value as an argument instead of a value from the iterator.
+     */
+    reduce<U>(callbackfn: (previousValue: U, currentValue: T, currentIndex: number) => U, initialValue: U): U;
+
+    /**
+     * Creates a new array from the values yielded by this iterator.
+     */
+    toArray(): Array<T>;
+
+    /**
+     * Performs the specified action for each element in the iterator.
+     * @param callbackfn  A function that accepts up to two arguments. forEach calls the callbackfn function one time for each element in the iterator.
+     */
+    forEach(callbackfn: (value: T, index: number) => void): void;
+
+    /**
+     * Determines whether the specified callback function returns true for any element of this iterator.
+     * @param predicate A function that accepts up to two arguments. The some method calls
+     * the predicate function for each element in this iterator until the predicate returns a value
+     * true, or until the end of the iterator.
+     */
+    some(predicate: (value: T, index: number) => unknown): boolean;
+
+    /**
+     * Determines whether all the members of this iterator satisfy the specified test.
+     * @param predicate A function that accepts up to two arguments. The every method calls
+     * the predicate function for each element in this iterator until the predicate returns
+     * false, or until the end of this iterator.
+     */
+    every(predicate: (value: T, index: number) => unknown): boolean;
+
+    /**
+     * Returns the value of the first element in this iterator where predicate is true, and undefined
+     * otherwise.
+     * @param predicate find calls predicate once for each element of this iterator, in
+     * order, until it finds one where predicate returns true. If such an element is found, find
+     * immediately returns that element value. Otherwise, find returns undefined.
+     */
+    find<S extends T>(predicate: (value: T, index: number) => value is S): S | undefined;
+    find(predicate: (value: T, index: number) => unknown): T | undefined;
+
+    readonly [Symbol.toStringTag]: "Iterator";
+}
+
+interface IteratorConstructor {
+    /**
+     * Creates a native iterator from an iterator or iterable object.
+     * Returns its input if the input already inherits from the built-in Iterator class.
+     * @param value An iterator or iterable object to convert a native iterator.
+     */
+    from<T>(value: Iterator<T> | Iterable<T>): NativeIterator<T>;
+}
+
+declare var Iterator: (abstract new <T>() => NativeIterator<T>) & IteratorConstructor;
+
+// TODO BEFORE MERGING: update all existing IterableIterator-return methods to return NativeIterator
+// I have only done a couple so far, for illustration
+
+interface Generator<T = unknown, TReturn = any, TNext = unknown> extends NativeIterator<T, TReturn, TNext> {
+}
+
+interface Array<T> {
+    /** Iterator */
+    [Symbol.iterator](): NativeIterator<T>;
+
+    /**
+     * Returns an iterable iterator of key, value pairs for every entry in the array
+     */
+    entries(): NativeIterator<[number, T]>;
+
+    /**
+     * Returns an iterable iterator of keys in the array
+     */
+    keys(): NativeIterator<number>;
+
+    /**
+     * Returns an iterable iterator of values in the array
+     */
+    values(): NativeIterator<T>;
+}

From 30d9bc258b8e2b72fe2fc03a2d7e05e1f72a12fb Mon Sep 17 00:00:00 2001
From: Kevin Gibbons <bakkot@gmail.com>
Date: Wed, 17 Apr 2024 15:55:05 -0700
Subject: [PATCH 4/9] Revert "add types for iterator helpers proposal"

This reverts commit bd51b0076f0e4d8fd039898c2ca8ac7a23e1b6e2.
(and subsequent commits)
---
 src/compiler/commandLineParser.ts             |   1 -
 src/lib/esnext.d.ts                           |   1 -
 src/lib/esnext.iterator.d.ts                  | 133 -----------
 src/lib/libs.json                             |   1 -
 .../reference/arrayFromAsync.symbols          |  18 +-
 tests/baselines/reference/awaitedType.types   |   1 -
 ...odule(moduleresolution=bundler).trace.json |  15 --
 ...dule(moduleresolution=nodenext).trace.json |  15 --
 .../reference/callWithSpread4.symbols         |   2 +-
 .../classFieldSuperAccessible.symbols         |   4 +-
 .../Parse --lib option with extra comma.js    |   2 +-
 ... --lib option with trailing white-space.js |   2 +-
 .../Parse invalid option of library flags.js  |   2 +-
 ...array to compiler-options with json api.js |   2 +-
 ...ompiler-options with jsonSourceFile api.js |   2 +-
 ... libs to compiler-options with json api.js |   2 +-
 ...ompiler-options with jsonSourceFile api.js |   2 +-
 ... libs to compiler-options with json api.js |   2 +-
 ...ompiler-options with jsonSourceFile api.js |   2 +-
 ... libs to compiler-options with json api.js |   2 +-
 ...ompiler-options with jsonSourceFile api.js |   2 +-
 ...lyTypeGeneratorReturnTypeFromUnion.symbols |   2 +-
 .../dependentDestructuredVariables.symbols    |   8 +-
 .../dependentDestructuredVariables.types      |   2 +-
 ...tructuredVariablesFromNestedPatterns.types |   4 +-
 .../esNextWeakRefs_IterableWeakMap.symbols    |   2 +-
 .../flatArrayNoExcessiveStackDepth.symbols    |   2 +-
 .../reference/generatorAssignability.symbols  |   8 +-
 .../generatorExplicitReturnType.symbols       |  10 +-
 .../generatorReturnContextualType.symbols     |   4 +-
 ...generatorReturnExpressionIsChecked.symbols |   2 +-
 ...nTypeIndirectReferenceToGlobalType.symbols |   2 +-
 .../generatorReturnTypeInference.symbols      |   2 +-
 ...eratorReturnTypeInferenceNonStrict.symbols |   2 +-
 .../generatorYieldContextualType.symbols      |   8 +-
 .../generatorYieldContextualType.types        |   3 -
 .../importExportInternalComments.symbols      |   2 +-
 .../reference/keyofAndIndexedAccess2.symbols  |   8 +-
 .../reference/modulePreserve2.trace.json      |  14 --
 .../reference/modulePreserve3.trace.json      |  13 --
 .../narrowingPastLastAssignment.symbols       |   2 +-
 tests/baselines/reference/nativeIterator.js   |  54 -----
 .../reference/nativeIterator.symbols          |  86 -------
 .../baselines/reference/nativeIterator.types  | 216 ------------------
 .../noIterationTypeErrorsInCFA.symbols        |   2 +-
 ...sTypesVersions(module=nodenext).trace.json |  14 --
 ...PackageImports(module=nodenext).trace.json |  15 --
 ...xportsTrailers(module=nodenext).trace.json |  14 --
 .../reactJsxReactResolvedNodeNext.trace.json  |  13 --
 ...eactJsxReactResolvedNodeNextEsm.trace.json |  13 --
 .../recursiveConditionalTypes.symbols         |   4 +-
 .../taggedTemplatesWithTypeArguments1.symbols |   2 +-
 ...does-not-add-color-when-NO_COLOR-is-set.js |   2 +-
 ...-when-host-can't-provide-terminal-width.js |   2 +-
 ...tatus.DiagnosticsPresent_OutputsSkipped.js |   2 +-
 .../telemetry/does-not-expose-paths.js        |   2 +-
 .../typeGuardConstructorNarrowAny.symbols     |   2 +-
 ...typeGuardConstructorPrimitiveTypes.symbols |   2 +-
 ...eldWithUnionInContextualReturnType.symbols |   2 +-
 .../types.asyncGenerators.es2018.2.symbols    |   2 +-
 .../typesVersions.ambientModules.trace.json   |  14 --
 .../typesVersions.emptyTypes.trace.json       |  15 --
 .../typesVersions.justIndex.trace.json        |  15 --
 .../typesVersions.multiFile.trace.json        |  14 --
 ...VersionsDeclarationEmit.ambient.trace.json |  14 --
 ...rsionsDeclarationEmit.multiFile.trace.json |  14 --
 ...it.multiFileBackReferenceToSelf.trace.json |  14 --
 ...ultiFileBackReferenceToUnmapped.trace.json |  14 --
 .../unionAndIntersectionInference3.symbols    |   4 +-
 tests/cases/compiler/nativeIterator.ts        |  30 ---
 70 files changed, 72 insertions(+), 838 deletions(-)
 delete mode 100644 src/lib/esnext.iterator.d.ts
 delete mode 100644 tests/baselines/reference/nativeIterator.js
 delete mode 100644 tests/baselines/reference/nativeIterator.symbols
 delete mode 100644 tests/baselines/reference/nativeIterator.types
 delete mode 100644 tests/cases/compiler/nativeIterator.ts

diff --git a/src/compiler/commandLineParser.ts b/src/compiler/commandLineParser.ts
index 9d3d21b09b746..b790ed08fbe08 100644
--- a/src/compiler/commandLineParser.ts
+++ b/src/compiler/commandLineParser.ts
@@ -236,7 +236,6 @@ const libEntries: [string, string][] = [
     ["esnext.object", "lib.esnext.object.d.ts"],
     ["esnext.array", "lib.esnext.array.d.ts"],
     ["esnext.regexp", "lib.esnext.regexp.d.ts"],
-    ["esnext.iterator", "lib.esnext.iterator.d.ts"],
     ["decorators", "lib.decorators.d.ts"],
     ["decorators.legacy", "lib.decorators.legacy.d.ts"],
 ];
diff --git a/src/lib/esnext.d.ts b/src/lib/esnext.d.ts
index 7897c58cef67c..9e601b60a27c2 100644
--- a/src/lib/esnext.d.ts
+++ b/src/lib/esnext.d.ts
@@ -7,4 +7,3 @@
 /// <reference lib="esnext.collection" />
 /// <reference lib="esnext.array" />
 /// <reference lib="esnext.regexp" />
-/// <reference lib="esnext.iterator" />
diff --git a/src/lib/esnext.iterator.d.ts b/src/lib/esnext.iterator.d.ts
deleted file mode 100644
index bcd4935c605a1..0000000000000
--- a/src/lib/esnext.iterator.d.ts
+++ /dev/null
@@ -1,133 +0,0 @@
-interface NativeIterator<T, TReturn = void, TNext = undefined> extends Iterator<T, TReturn, TNext> {
-    /**
-     * Returns this iterator.
-     */
-    [Symbol.iterator](): NativeIterator<T, TReturn, TNext>;
-
-    /**
-     * Creates an iterator whose values are the result of applying the callback to the values from this iterator.
-     * @param callbackfn A function that accepts up to two arguments to be used to transform values from the underlying iterator.
-     */
-    map<U>(callbackfn: (value: T, index: number) => U): NativeIterator<U>;
-
-    /**
-     * Creates an iterator whose values are those from this iterator for which the provided predicate returns true.
-     * @param predicate A function that accepts up to two arguments to be used to test values from the underlying iterator.
-     */
-    filter<S extends T>(predicate: (value: T, index: number) => value is S): NativeIterator<S>;
-
-    /**
-     * Creates an iterator whose values are those from this iterator for which the provided predicate returns true.
-     * @param predicate A function that accepts up to two arguments to be used to test values from the underlying iterator.
-     */
-    filter(predicate: (value: T, index: number) => unknown): NativeIterator<T>;
-
-    /**
-     * Creates an iterator whose values are the values from this iterator, stopping once the provided limit is reached.
-     * @param limit The maximum number of values to yield.
-     */
-    take(limit: number): NativeIterator<T>;
-
-    /**
-     * Creates an iterator whose values are the values from this iterator after skipping the provided count.
-     * @param count The number of values to drop.
-     */
-    drop(count: number): NativeIterator<T>;
-
-    /**
-     * Creates an iterator whose values are the result of applying the callback to the values from this iterator and then flattening the resulting iterators or iterables.
-     * @param callback A function that accepts up to two arguments to be used to transform values from the underlying iterator into new iterators or iterables to be flattened into the result.
-     */
-    flatMap<U>(callback: (value: T, index: number) => Iterator<U> | Iterable<U>): NativeIterator<U>;
-
-    /**
-     * Calls the specified callback function for all the elements in this iterator. The return value of the callback function is the accumulated result, and is provided as an argument in the next call to the callback function.
-     * @param callbackfn A function that accepts up to three arguments. The reduce method calls the callbackfn function one time for each element in the iterator.
-     * @param initialValue If initialValue is specified, it is used as the initial value to start the accumulation. The first call to the callbackfn function provides this value as an argument instead of a value from the iterator.
-     */
-    reduce(callbackfn: (previousValue: T, currentValue: T, currentIndex: number) => T): T;
-    reduce(callbackfn: (previousValue: T, currentValue: T, currentIndex: number) => T, initialValue: T): T;
-
-    /**
-     * Calls the specified callback function for all the elements in this iterator. The return value of the callback function is the accumulated result, and is provided as an argument in the next call to the callback function.
-     * @param callbackfn A function that accepts up to three arguments. The reduce method calls the callbackfn function one time for each element in the iterator.
-     * @param initialValue If initialValue is specified, it is used as the initial value to start the accumulation. The first call to the callbackfn function provides this value as an argument instead of a value from the iterator.
-     */
-    reduce<U>(callbackfn: (previousValue: U, currentValue: T, currentIndex: number) => U, initialValue: U): U;
-
-    /**
-     * Creates a new array from the values yielded by this iterator.
-     */
-    toArray(): Array<T>;
-
-    /**
-     * Performs the specified action for each element in the iterator.
-     * @param callbackfn  A function that accepts up to two arguments. forEach calls the callbackfn function one time for each element in the iterator.
-     */
-    forEach(callbackfn: (value: T, index: number) => void): void;
-
-    /**
-     * Determines whether the specified callback function returns true for any element of this iterator.
-     * @param predicate A function that accepts up to two arguments. The some method calls
-     * the predicate function for each element in this iterator until the predicate returns a value
-     * true, or until the end of the iterator.
-     */
-    some(predicate: (value: T, index: number) => unknown): boolean;
-
-    /**
-     * Determines whether all the members of this iterator satisfy the specified test.
-     * @param predicate A function that accepts up to two arguments. The every method calls
-     * the predicate function for each element in this iterator until the predicate returns
-     * false, or until the end of this iterator.
-     */
-    every(predicate: (value: T, index: number) => unknown): boolean;
-
-    /**
-     * Returns the value of the first element in this iterator where predicate is true, and undefined
-     * otherwise.
-     * @param predicate find calls predicate once for each element of this iterator, in
-     * order, until it finds one where predicate returns true. If such an element is found, find
-     * immediately returns that element value. Otherwise, find returns undefined.
-     */
-    find<S extends T>(predicate: (value: T, index: number) => value is S): S | undefined;
-    find(predicate: (value: T, index: number) => unknown): T | undefined;
-
-    readonly [Symbol.toStringTag]: "Iterator";
-}
-
-interface IteratorConstructor {
-    /**
-     * Creates a native iterator from an iterator or iterable object.
-     * Returns its input if the input already inherits from the built-in Iterator class.
-     * @param value An iterator or iterable object to convert a native iterator.
-     */
-    from<T>(value: Iterator<T> | Iterable<T>): NativeIterator<T>;
-}
-
-declare var Iterator: (abstract new <T>() => NativeIterator<T>) & IteratorConstructor;
-
-// TODO BEFORE MERGING: update all existing IterableIterator-return methods to return NativeIterator
-// I have only done a couple so far, for illustration
-
-interface Generator<T = unknown, TReturn = any, TNext = unknown> extends NativeIterator<T, TReturn, TNext> {
-}
-
-interface Array<T> {
-    /** Iterator */
-    [Symbol.iterator](): NativeIterator<T>;
-
-    /**
-     * Returns an iterable iterator of key, value pairs for every entry in the array
-     */
-    entries(): NativeIterator<[number, T]>;
-
-    /**
-     * Returns an iterable iterator of keys in the array
-     */
-    keys(): NativeIterator<number>;
-
-    /**
-     * Returns an iterable iterator of values in the array
-     */
-    values(): NativeIterator<T>;
-}
diff --git a/src/lib/libs.json b/src/lib/libs.json
index 5103307c2b24b..d97a25e09679f 100644
--- a/src/lib/libs.json
+++ b/src/lib/libs.json
@@ -79,7 +79,6 @@
         "esnext.collection",
         "esnext.array",
         "esnext.regexp",
-        "esnext.iterator",
         "decorators",
         "decorators.legacy",
         // Default libraries
diff --git a/tests/baselines/reference/arrayFromAsync.symbols b/tests/baselines/reference/arrayFromAsync.symbols
index 0b6e3e2c0463e..81154e0a90567 100644
--- a/tests/baselines/reference/arrayFromAsync.symbols
+++ b/tests/baselines/reference/arrayFromAsync.symbols
@@ -82,14 +82,14 @@ for await (const v of asyncGen(4)) {
 const sameArr1 = await Array.fromAsync(arrLike);
 >sameArr1 : Symbol(sameArr1, Decl(arrayFromAsync.ts, 25, 5))
 >Array.fromAsync : Symbol(ArrayConstructor.fromAsync, Decl(lib.esnext.array.d.ts, --, --), Decl(lib.esnext.array.d.ts, --, --))
->Array : Symbol(Array, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.symbol.wellknown.d.ts, --, --) ... and 5 more)
+>Array : Symbol(Array, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.symbol.wellknown.d.ts, --, --) ... and 4 more)
 >fromAsync : Symbol(ArrayConstructor.fromAsync, Decl(lib.esnext.array.d.ts, --, --), Decl(lib.esnext.array.d.ts, --, --))
 >arrLike : Symbol(arrLike, Decl(arrayFromAsync.ts, 12, 5))
 
 const sameArr2 = await Array.fromAsync([Promise.resolve(0), Promise.resolve(2), Promise.resolve(4), Promise.resolve(6)]);
 >sameArr2 : Symbol(sameArr2, Decl(arrayFromAsync.ts, 26, 5))
 >Array.fromAsync : Symbol(ArrayConstructor.fromAsync, Decl(lib.esnext.array.d.ts, --, --), Decl(lib.esnext.array.d.ts, --, --))
->Array : Symbol(Array, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.symbol.wellknown.d.ts, --, --) ... and 5 more)
+>Array : Symbol(Array, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.symbol.wellknown.d.ts, --, --) ... and 4 more)
 >fromAsync : Symbol(ArrayConstructor.fromAsync, Decl(lib.esnext.array.d.ts, --, --), Decl(lib.esnext.array.d.ts, --, --))
 >Promise.resolve : Symbol(PromiseConstructor.resolve, Decl(lib.es2015.promise.d.ts, --, --), Decl(lib.es2015.promise.d.ts, --, --), Decl(lib.es2015.promise.d.ts, --, --))
 >Promise : Symbol(Promise, Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.promise.d.ts, --, --), Decl(lib.es2015.symbol.wellknown.d.ts, --, --), Decl(lib.es2018.promise.d.ts, --, --))
@@ -107,14 +107,14 @@ const sameArr2 = await Array.fromAsync([Promise.resolve(0), Promise.resolve(2),
 const sameArr3 = await Array.fromAsync(genPromises(4));
 >sameArr3 : Symbol(sameArr3, Decl(arrayFromAsync.ts, 27, 5))
 >Array.fromAsync : Symbol(ArrayConstructor.fromAsync, Decl(lib.esnext.array.d.ts, --, --), Decl(lib.esnext.array.d.ts, --, --))
->Array : Symbol(Array, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.symbol.wellknown.d.ts, --, --) ... and 5 more)
+>Array : Symbol(Array, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.symbol.wellknown.d.ts, --, --) ... and 4 more)
 >fromAsync : Symbol(ArrayConstructor.fromAsync, Decl(lib.esnext.array.d.ts, --, --), Decl(lib.esnext.array.d.ts, --, --))
 >genPromises : Symbol(genPromises, Decl(arrayFromAsync.ts, 4, 3))
 
 const sameArr4 = await Array.fromAsync(asyncGen(4));
 >sameArr4 : Symbol(sameArr4, Decl(arrayFromAsync.ts, 28, 5))
 >Array.fromAsync : Symbol(ArrayConstructor.fromAsync, Decl(lib.esnext.array.d.ts, --, --), Decl(lib.esnext.array.d.ts, --, --))
->Array : Symbol(Array, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.symbol.wellknown.d.ts, --, --) ... and 5 more)
+>Array : Symbol(Array, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.symbol.wellknown.d.ts, --, --) ... and 4 more)
 >fromAsync : Symbol(ArrayConstructor.fromAsync, Decl(lib.esnext.array.d.ts, --, --), Decl(lib.esnext.array.d.ts, --, --))
 >asyncGen : Symbol(asyncGen, Decl(arrayFromAsync.ts, 0, 11))
 
@@ -127,7 +127,7 @@ Data.fromAsync = Array.fromAsync;
 >Data : Symbol(Data, Decl(arrayFromAsync.ts, 28, 52), Decl(arrayFromAsync.ts, 30, 20))
 >fromAsync : Symbol(Data.fromAsync, Decl(arrayFromAsync.ts, 30, 20))
 >Array.fromAsync : Symbol(ArrayConstructor.fromAsync, Decl(lib.esnext.array.d.ts, --, --), Decl(lib.esnext.array.d.ts, --, --))
->Array : Symbol(Array, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.symbol.wellknown.d.ts, --, --) ... and 5 more)
+>Array : Symbol(Array, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.symbol.wellknown.d.ts, --, --) ... and 4 more)
 >fromAsync : Symbol(ArrayConstructor.fromAsync, Decl(lib.esnext.array.d.ts, --, --), Decl(lib.esnext.array.d.ts, --, --))
 
 const sameArr5 = await Data.fromAsync(asyncGen(4));
@@ -140,7 +140,7 @@ const sameArr5 = await Data.fromAsync(asyncGen(4));
 const mapArr1 = await Array.fromAsync(asyncGen(4), v => v ** 2);
 >mapArr1 : Symbol(mapArr1, Decl(arrayFromAsync.ts, 34, 5))
 >Array.fromAsync : Symbol(ArrayConstructor.fromAsync, Decl(lib.esnext.array.d.ts, --, --), Decl(lib.esnext.array.d.ts, --, --))
->Array : Symbol(Array, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.symbol.wellknown.d.ts, --, --) ... and 5 more)
+>Array : Symbol(Array, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.symbol.wellknown.d.ts, --, --) ... and 4 more)
 >fromAsync : Symbol(ArrayConstructor.fromAsync, Decl(lib.esnext.array.d.ts, --, --), Decl(lib.esnext.array.d.ts, --, --))
 >asyncGen : Symbol(asyncGen, Decl(arrayFromAsync.ts, 0, 11))
 >v : Symbol(v, Decl(arrayFromAsync.ts, 34, 50))
@@ -149,7 +149,7 @@ const mapArr1 = await Array.fromAsync(asyncGen(4), v => v ** 2);
 const mapArr2 = await Array.fromAsync([0,2,4,6], v => Promise.resolve(v ** 2));
 >mapArr2 : Symbol(mapArr2, Decl(arrayFromAsync.ts, 35, 5))
 >Array.fromAsync : Symbol(ArrayConstructor.fromAsync, Decl(lib.esnext.array.d.ts, --, --), Decl(lib.esnext.array.d.ts, --, --))
->Array : Symbol(Array, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.symbol.wellknown.d.ts, --, --) ... and 5 more)
+>Array : Symbol(Array, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.symbol.wellknown.d.ts, --, --) ... and 4 more)
 >fromAsync : Symbol(ArrayConstructor.fromAsync, Decl(lib.esnext.array.d.ts, --, --), Decl(lib.esnext.array.d.ts, --, --))
 >v : Symbol(v, Decl(arrayFromAsync.ts, 35, 48))
 >Promise.resolve : Symbol(PromiseConstructor.resolve, Decl(lib.es2015.promise.d.ts, --, --), Decl(lib.es2015.promise.d.ts, --, --), Decl(lib.es2015.promise.d.ts, --, --))
@@ -160,7 +160,7 @@ const mapArr2 = await Array.fromAsync([0,2,4,6], v => Promise.resolve(v ** 2));
 const mapArr3 = await Array.fromAsync([0,2,4,6], v => v ** 2);
 >mapArr3 : Symbol(mapArr3, Decl(arrayFromAsync.ts, 36, 5))
 >Array.fromAsync : Symbol(ArrayConstructor.fromAsync, Decl(lib.esnext.array.d.ts, --, --), Decl(lib.esnext.array.d.ts, --, --))
->Array : Symbol(Array, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.symbol.wellknown.d.ts, --, --) ... and 5 more)
+>Array : Symbol(Array, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.symbol.wellknown.d.ts, --, --) ... and 4 more)
 >fromAsync : Symbol(ArrayConstructor.fromAsync, Decl(lib.esnext.array.d.ts, --, --), Decl(lib.esnext.array.d.ts, --, --))
 >v : Symbol(v, Decl(arrayFromAsync.ts, 36, 48))
 >v : Symbol(v, Decl(arrayFromAsync.ts, 36, 48))
@@ -181,7 +181,7 @@ const badIterable = { [Symbol.iterator] () { throw err; } };
 const badArray = await Array.fromAsync(badIterable);
 >badArray : Symbol(badArray, Decl(arrayFromAsync.ts, 41, 5))
 >Array.fromAsync : Symbol(ArrayConstructor.fromAsync, Decl(lib.esnext.array.d.ts, --, --), Decl(lib.esnext.array.d.ts, --, --))
->Array : Symbol(Array, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.symbol.wellknown.d.ts, --, --) ... and 5 more)
+>Array : Symbol(Array, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.symbol.wellknown.d.ts, --, --) ... and 4 more)
 >fromAsync : Symbol(ArrayConstructor.fromAsync, Decl(lib.esnext.array.d.ts, --, --), Decl(lib.esnext.array.d.ts, --, --))
 >badIterable : Symbol(badIterable, Decl(arrayFromAsync.ts, 39, 5))
 
diff --git a/tests/baselines/reference/awaitedType.types b/tests/baselines/reference/awaitedType.types
index 51a77de358539..2f541fa0f0c03 100644
--- a/tests/baselines/reference/awaitedType.types
+++ b/tests/baselines/reference/awaitedType.types
@@ -1,7 +1,6 @@
 //// [tests/cases/compiler/awaitedType.ts] ////
 
 === Performance Stats ===
-Type Count: 1,000
 Instantiation count: 25,000
 
 === awaitedType.ts ===
diff --git a/tests/baselines/reference/bundlerDirectoryModule(moduleresolution=bundler).trace.json b/tests/baselines/reference/bundlerDirectoryModule(moduleresolution=bundler).trace.json
index 627a7432632c9..6a9e7816773e6 100644
--- a/tests/baselines/reference/bundlerDirectoryModule(moduleresolution=bundler).trace.json
+++ b/tests/baselines/reference/bundlerDirectoryModule(moduleresolution=bundler).trace.json
@@ -1074,21 +1074,6 @@
     "======== Module name '@typescript/lib-esnext/regexp' was not resolved. ========",
     "File '/.ts/package.json' does not exist according to earlier cached lookups.",
     "File '/package.json' does not exist according to earlier cached lookups.",
-    "======== Resolving module '@typescript/lib-esnext/iterator' from '/.src/__lib_node_modules_lookup_lib.esnext.iterator.d.ts__.ts'. ========",
-    "Explicitly specified module resolution kind: 'Node10'.",
-    "Loading module '@typescript/lib-esnext/iterator' from 'node_modules' folder, target file types: TypeScript, Declaration.",
-    "Searching all ancestor node_modules directories for preferred extensions: TypeScript, Declaration.",
-    "Directory '/.src/node_modules' does not exist, skipping all lookups in it.",
-    "Scoped package detected, looking in 'typescript__lib-esnext/iterator'",
-    "Directory '/node_modules' does not exist, skipping all lookups in it.",
-    "Scoped package detected, looking in 'typescript__lib-esnext/iterator'",
-    "Loading module '@typescript/lib-esnext/iterator' from 'node_modules' folder, target file types: JavaScript.",
-    "Searching all ancestor node_modules directories for fallback extensions: JavaScript.",
-    "Directory '/.src/node_modules' does not exist, skipping all lookups in it.",
-    "Directory '/node_modules' does not exist, skipping all lookups in it.",
-    "======== Module name '@typescript/lib-esnext/iterator' was not resolved. ========",
-    "File '/.ts/package.json' does not exist according to earlier cached lookups.",
-    "File '/package.json' does not exist according to earlier cached lookups.",
     "======== Resolving module '@typescript/lib-dom' from '/.src/__lib_node_modules_lookup_lib.dom.d.ts__.ts'. ========",
     "Explicitly specified module resolution kind: 'Node10'.",
     "Loading module '@typescript/lib-dom' from 'node_modules' folder, target file types: TypeScript, Declaration.",
diff --git a/tests/baselines/reference/bundlerDirectoryModule(moduleresolution=nodenext).trace.json b/tests/baselines/reference/bundlerDirectoryModule(moduleresolution=nodenext).trace.json
index 55ca42917a3ad..d20de95869c4e 100644
--- a/tests/baselines/reference/bundlerDirectoryModule(moduleresolution=nodenext).trace.json
+++ b/tests/baselines/reference/bundlerDirectoryModule(moduleresolution=nodenext).trace.json
@@ -1074,21 +1074,6 @@
     "======== Module name '@typescript/lib-esnext/regexp' was not resolved. ========",
     "File '/.ts/package.json' does not exist according to earlier cached lookups.",
     "File '/package.json' does not exist according to earlier cached lookups.",
-    "======== Resolving module '@typescript/lib-esnext/iterator' from '/.src/__lib_node_modules_lookup_lib.esnext.iterator.d.ts__.ts'. ========",
-    "Explicitly specified module resolution kind: 'Node10'.",
-    "Loading module '@typescript/lib-esnext/iterator' from 'node_modules' folder, target file types: TypeScript, Declaration.",
-    "Searching all ancestor node_modules directories for preferred extensions: TypeScript, Declaration.",
-    "Directory '/.src/node_modules' does not exist, skipping all lookups in it.",
-    "Scoped package detected, looking in 'typescript__lib-esnext/iterator'",
-    "Directory '/node_modules' does not exist, skipping all lookups in it.",
-    "Scoped package detected, looking in 'typescript__lib-esnext/iterator'",
-    "Loading module '@typescript/lib-esnext/iterator' from 'node_modules' folder, target file types: JavaScript.",
-    "Searching all ancestor node_modules directories for fallback extensions: JavaScript.",
-    "Directory '/.src/node_modules' does not exist, skipping all lookups in it.",
-    "Directory '/node_modules' does not exist, skipping all lookups in it.",
-    "======== Module name '@typescript/lib-esnext/iterator' was not resolved. ========",
-    "File '/.ts/package.json' does not exist according to earlier cached lookups.",
-    "File '/package.json' does not exist according to earlier cached lookups.",
     "======== Resolving module '@typescript/lib-dom' from '/.src/__lib_node_modules_lookup_lib.dom.d.ts__.ts'. ========",
     "Explicitly specified module resolution kind: 'Node10'.",
     "Loading module '@typescript/lib-dom' from 'node_modules' folder, target file types: TypeScript, Declaration.",
diff --git a/tests/baselines/reference/callWithSpread4.symbols b/tests/baselines/reference/callWithSpread4.symbols
index 3cf1d8a384ded..1de6a352dfb4c 100644
--- a/tests/baselines/reference/callWithSpread4.symbols
+++ b/tests/baselines/reference/callWithSpread4.symbols
@@ -45,7 +45,7 @@ declare const pli: {
 >RW : Symbol(RW, Decl(callWithSpread4.ts, 1, 22))
 >W : Symbol(W, Decl(callWithSpread4.ts, 0, 22))
 >streams : Symbol(streams, Decl(callWithSpread4.ts, 6, 23))
->Array : Symbol(Array, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.symbol.wellknown.d.ts, --, --) ... and 5 more)
+>Array : Symbol(Array, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.symbol.wellknown.d.ts, --, --) ... and 4 more)
 >RW : Symbol(RW, Decl(callWithSpread4.ts, 1, 22))
 >W : Symbol(W, Decl(callWithSpread4.ts, 0, 22))
 >Promise : Symbol(Promise, Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.promise.d.ts, --, --), Decl(lib.es2015.symbol.wellknown.d.ts, --, --), Decl(lib.es2018.promise.d.ts, --, --))
diff --git a/tests/baselines/reference/classFieldSuperAccessible.symbols b/tests/baselines/reference/classFieldSuperAccessible.symbols
index 7697949bd5ef7..9d23d58215b51 100644
--- a/tests/baselines/reference/classFieldSuperAccessible.symbols
+++ b/tests/baselines/reference/classFieldSuperAccessible.symbols
@@ -31,7 +31,7 @@ class B extends Number {
 }
 class C extends Array {
 >C : Symbol(C, Decl(classFieldSuperAccessible.ts, 9, 1))
->Array : Symbol(Array, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.symbol.wellknown.d.ts, --, --) ... and 5 more)
+>Array : Symbol(Array, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.symbol.wellknown.d.ts, --, --) ... and 4 more)
 
     foo() {
 >foo : Symbol(C.foo, Decl(classFieldSuperAccessible.ts, 10, 23))
@@ -41,7 +41,7 @@ class C extends Array {
 >console : Symbol(console, Decl(lib.dom.d.ts, --, --))
 >log : Symbol(Console.log, Decl(lib.dom.d.ts, --, --))
 >super.length : Symbol(Array.length, Decl(lib.es5.d.ts, --, --))
->super : Symbol(Array, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.symbol.wellknown.d.ts, --, --) ... and 5 more)
+>super : Symbol(Array, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.symbol.wellknown.d.ts, --, --) ... and 4 more)
 >length : Symbol(Array.length, Decl(lib.es5.d.ts, --, --))
     }
 }
diff --git a/tests/baselines/reference/config/commandLineParsing/parseCommandLine/Parse --lib option with extra comma.js b/tests/baselines/reference/config/commandLineParsing/parseCommandLine/Parse --lib option with extra comma.js
index cfcd52b395baf..44a56c66ec5b6 100644
--- a/tests/baselines/reference/config/commandLineParsing/parseCommandLine/Parse --lib option with extra comma.js	
+++ b/tests/baselines/reference/config/commandLineParsing/parseCommandLine/Parse --lib option with extra comma.js	
@@ -10,4 +10,4 @@ WatchOptions::
 FileNames::
 es7,0.ts
 Errors::
-error TS6046: Argument for '--lib' option must be: 'es5', 'es6', 'es2015', 'es7', 'es2016', 'es2017', 'es2018', 'es2019', 'es2020', 'es2021', 'es2022', 'es2023', 'esnext', 'dom', 'dom.iterable', 'dom.asynciterable', 'webworker', 'webworker.importscripts', 'webworker.iterable', 'webworker.asynciterable', 'scripthost', 'es2015.core', 'es2015.collection', 'es2015.generator', 'es2015.iterable', 'es2015.promise', 'es2015.proxy', 'es2015.reflect', 'es2015.symbol', 'es2015.symbol.wellknown', 'es2016.array.include', 'es2016.intl', 'es2017.date', 'es2017.object', 'es2017.sharedmemory', 'es2017.string', 'es2017.intl', 'es2017.typedarrays', 'es2018.asyncgenerator', 'es2018.asynciterable', 'es2018.intl', 'es2018.promise', 'es2018.regexp', 'es2019.array', 'es2019.object', 'es2019.string', 'es2019.symbol', 'es2019.intl', 'es2020.bigint', 'es2020.date', 'es2020.promise', 'es2020.sharedmemory', 'es2020.string', 'es2020.symbol.wellknown', 'es2020.intl', 'es2020.number', 'es2021.promise', 'es2021.string', 'es2021.weakref', 'es2021.intl', 'es2022.array', 'es2022.error', 'es2022.intl', 'es2022.object', 'es2022.sharedmemory', 'es2022.string', 'es2022.regexp', 'es2023.array', 'es2023.collection', 'es2023.intl', 'esnext.array', 'esnext.collection', 'esnext.symbol', 'esnext.asynciterable', 'esnext.intl', 'esnext.disposable', 'esnext.bigint', 'esnext.string', 'esnext.promise', 'esnext.weakref', 'esnext.decorators', 'esnext.object', 'esnext.regexp', 'esnext.iterator', 'decorators', 'decorators.legacy'.
+error TS6046: Argument for '--lib' option must be: 'es5', 'es6', 'es2015', 'es7', 'es2016', 'es2017', 'es2018', 'es2019', 'es2020', 'es2021', 'es2022', 'es2023', 'esnext', 'dom', 'dom.iterable', 'dom.asynciterable', 'webworker', 'webworker.importscripts', 'webworker.iterable', 'webworker.asynciterable', 'scripthost', 'es2015.core', 'es2015.collection', 'es2015.generator', 'es2015.iterable', 'es2015.promise', 'es2015.proxy', 'es2015.reflect', 'es2015.symbol', 'es2015.symbol.wellknown', 'es2016.array.include', 'es2016.intl', 'es2017.date', 'es2017.object', 'es2017.sharedmemory', 'es2017.string', 'es2017.intl', 'es2017.typedarrays', 'es2018.asyncgenerator', 'es2018.asynciterable', 'es2018.intl', 'es2018.promise', 'es2018.regexp', 'es2019.array', 'es2019.object', 'es2019.string', 'es2019.symbol', 'es2019.intl', 'es2020.bigint', 'es2020.date', 'es2020.promise', 'es2020.sharedmemory', 'es2020.string', 'es2020.symbol.wellknown', 'es2020.intl', 'es2020.number', 'es2021.promise', 'es2021.string', 'es2021.weakref', 'es2021.intl', 'es2022.array', 'es2022.error', 'es2022.intl', 'es2022.object', 'es2022.sharedmemory', 'es2022.string', 'es2022.regexp', 'es2023.array', 'es2023.collection', 'es2023.intl', 'esnext.array', 'esnext.collection', 'esnext.symbol', 'esnext.asynciterable', 'esnext.intl', 'esnext.disposable', 'esnext.bigint', 'esnext.string', 'esnext.promise', 'esnext.weakref', 'esnext.decorators', 'esnext.object', 'esnext.regexp', 'decorators', 'decorators.legacy'.
diff --git a/tests/baselines/reference/config/commandLineParsing/parseCommandLine/Parse --lib option with trailing white-space.js b/tests/baselines/reference/config/commandLineParsing/parseCommandLine/Parse --lib option with trailing white-space.js
index 596b4249a3c7a..87aeb7b21a2f3 100644
--- a/tests/baselines/reference/config/commandLineParsing/parseCommandLine/Parse --lib option with trailing white-space.js	
+++ b/tests/baselines/reference/config/commandLineParsing/parseCommandLine/Parse --lib option with trailing white-space.js	
@@ -10,4 +10,4 @@ WatchOptions::
 FileNames::
 es7,0.ts
 Errors::
-error TS6046: Argument for '--lib' option must be: 'es5', 'es6', 'es2015', 'es7', 'es2016', 'es2017', 'es2018', 'es2019', 'es2020', 'es2021', 'es2022', 'es2023', 'esnext', 'dom', 'dom.iterable', 'dom.asynciterable', 'webworker', 'webworker.importscripts', 'webworker.iterable', 'webworker.asynciterable', 'scripthost', 'es2015.core', 'es2015.collection', 'es2015.generator', 'es2015.iterable', 'es2015.promise', 'es2015.proxy', 'es2015.reflect', 'es2015.symbol', 'es2015.symbol.wellknown', 'es2016.array.include', 'es2016.intl', 'es2017.date', 'es2017.object', 'es2017.sharedmemory', 'es2017.string', 'es2017.intl', 'es2017.typedarrays', 'es2018.asyncgenerator', 'es2018.asynciterable', 'es2018.intl', 'es2018.promise', 'es2018.regexp', 'es2019.array', 'es2019.object', 'es2019.string', 'es2019.symbol', 'es2019.intl', 'es2020.bigint', 'es2020.date', 'es2020.promise', 'es2020.sharedmemory', 'es2020.string', 'es2020.symbol.wellknown', 'es2020.intl', 'es2020.number', 'es2021.promise', 'es2021.string', 'es2021.weakref', 'es2021.intl', 'es2022.array', 'es2022.error', 'es2022.intl', 'es2022.object', 'es2022.sharedmemory', 'es2022.string', 'es2022.regexp', 'es2023.array', 'es2023.collection', 'es2023.intl', 'esnext.array', 'esnext.collection', 'esnext.symbol', 'esnext.asynciterable', 'esnext.intl', 'esnext.disposable', 'esnext.bigint', 'esnext.string', 'esnext.promise', 'esnext.weakref', 'esnext.decorators', 'esnext.object', 'esnext.regexp', 'esnext.iterator', 'decorators', 'decorators.legacy'.
+error TS6046: Argument for '--lib' option must be: 'es5', 'es6', 'es2015', 'es7', 'es2016', 'es2017', 'es2018', 'es2019', 'es2020', 'es2021', 'es2022', 'es2023', 'esnext', 'dom', 'dom.iterable', 'dom.asynciterable', 'webworker', 'webworker.importscripts', 'webworker.iterable', 'webworker.asynciterable', 'scripthost', 'es2015.core', 'es2015.collection', 'es2015.generator', 'es2015.iterable', 'es2015.promise', 'es2015.proxy', 'es2015.reflect', 'es2015.symbol', 'es2015.symbol.wellknown', 'es2016.array.include', 'es2016.intl', 'es2017.date', 'es2017.object', 'es2017.sharedmemory', 'es2017.string', 'es2017.intl', 'es2017.typedarrays', 'es2018.asyncgenerator', 'es2018.asynciterable', 'es2018.intl', 'es2018.promise', 'es2018.regexp', 'es2019.array', 'es2019.object', 'es2019.string', 'es2019.symbol', 'es2019.intl', 'es2020.bigint', 'es2020.date', 'es2020.promise', 'es2020.sharedmemory', 'es2020.string', 'es2020.symbol.wellknown', 'es2020.intl', 'es2020.number', 'es2021.promise', 'es2021.string', 'es2021.weakref', 'es2021.intl', 'es2022.array', 'es2022.error', 'es2022.intl', 'es2022.object', 'es2022.sharedmemory', 'es2022.string', 'es2022.regexp', 'es2023.array', 'es2023.collection', 'es2023.intl', 'esnext.array', 'esnext.collection', 'esnext.symbol', 'esnext.asynciterable', 'esnext.intl', 'esnext.disposable', 'esnext.bigint', 'esnext.string', 'esnext.promise', 'esnext.weakref', 'esnext.decorators', 'esnext.object', 'esnext.regexp', 'decorators', 'decorators.legacy'.
diff --git a/tests/baselines/reference/config/commandLineParsing/parseCommandLine/Parse invalid option of library flags.js b/tests/baselines/reference/config/commandLineParsing/parseCommandLine/Parse invalid option of library flags.js
index 807f4f9583f0f..0213cdbf5b8cd 100644
--- a/tests/baselines/reference/config/commandLineParsing/parseCommandLine/Parse invalid option of library flags.js	
+++ b/tests/baselines/reference/config/commandLineParsing/parseCommandLine/Parse invalid option of library flags.js	
@@ -10,4 +10,4 @@ WatchOptions::
 FileNames::
 0.ts
 Errors::
-error TS6046: Argument for '--lib' option must be: 'es5', 'es6', 'es2015', 'es7', 'es2016', 'es2017', 'es2018', 'es2019', 'es2020', 'es2021', 'es2022', 'es2023', 'esnext', 'dom', 'dom.iterable', 'dom.asynciterable', 'webworker', 'webworker.importscripts', 'webworker.iterable', 'webworker.asynciterable', 'scripthost', 'es2015.core', 'es2015.collection', 'es2015.generator', 'es2015.iterable', 'es2015.promise', 'es2015.proxy', 'es2015.reflect', 'es2015.symbol', 'es2015.symbol.wellknown', 'es2016.array.include', 'es2016.intl', 'es2017.date', 'es2017.object', 'es2017.sharedmemory', 'es2017.string', 'es2017.intl', 'es2017.typedarrays', 'es2018.asyncgenerator', 'es2018.asynciterable', 'es2018.intl', 'es2018.promise', 'es2018.regexp', 'es2019.array', 'es2019.object', 'es2019.string', 'es2019.symbol', 'es2019.intl', 'es2020.bigint', 'es2020.date', 'es2020.promise', 'es2020.sharedmemory', 'es2020.string', 'es2020.symbol.wellknown', 'es2020.intl', 'es2020.number', 'es2021.promise', 'es2021.string', 'es2021.weakref', 'es2021.intl', 'es2022.array', 'es2022.error', 'es2022.intl', 'es2022.object', 'es2022.sharedmemory', 'es2022.string', 'es2022.regexp', 'es2023.array', 'es2023.collection', 'es2023.intl', 'esnext.array', 'esnext.collection', 'esnext.symbol', 'esnext.asynciterable', 'esnext.intl', 'esnext.disposable', 'esnext.bigint', 'esnext.string', 'esnext.promise', 'esnext.weakref', 'esnext.decorators', 'esnext.object', 'esnext.regexp', 'esnext.iterator', 'decorators', 'decorators.legacy'.
+error TS6046: Argument for '--lib' option must be: 'es5', 'es6', 'es2015', 'es7', 'es2016', 'es2017', 'es2018', 'es2019', 'es2020', 'es2021', 'es2022', 'es2023', 'esnext', 'dom', 'dom.iterable', 'dom.asynciterable', 'webworker', 'webworker.importscripts', 'webworker.iterable', 'webworker.asynciterable', 'scripthost', 'es2015.core', 'es2015.collection', 'es2015.generator', 'es2015.iterable', 'es2015.promise', 'es2015.proxy', 'es2015.reflect', 'es2015.symbol', 'es2015.symbol.wellknown', 'es2016.array.include', 'es2016.intl', 'es2017.date', 'es2017.object', 'es2017.sharedmemory', 'es2017.string', 'es2017.intl', 'es2017.typedarrays', 'es2018.asyncgenerator', 'es2018.asynciterable', 'es2018.intl', 'es2018.promise', 'es2018.regexp', 'es2019.array', 'es2019.object', 'es2019.string', 'es2019.symbol', 'es2019.intl', 'es2020.bigint', 'es2020.date', 'es2020.promise', 'es2020.sharedmemory', 'es2020.string', 'es2020.symbol.wellknown', 'es2020.intl', 'es2020.number', 'es2021.promise', 'es2021.string', 'es2021.weakref', 'es2021.intl', 'es2022.array', 'es2022.error', 'es2022.intl', 'es2022.object', 'es2022.sharedmemory', 'es2022.string', 'es2022.regexp', 'es2023.array', 'es2023.collection', 'es2023.intl', 'esnext.array', 'esnext.collection', 'esnext.symbol', 'esnext.asynciterable', 'esnext.intl', 'esnext.disposable', 'esnext.bigint', 'esnext.string', 'esnext.promise', 'esnext.weakref', 'esnext.decorators', 'esnext.object', 'esnext.regexp', 'decorators', 'decorators.legacy'.
diff --git a/tests/baselines/reference/config/convertCompilerOptionsFromJson/Convert empty string option of libs array to compiler-options with json api.js b/tests/baselines/reference/config/convertCompilerOptionsFromJson/Convert empty string option of libs array to compiler-options with json api.js
index 29cc5e97530d6..04028e2fda1d2 100644
--- a/tests/baselines/reference/config/convertCompilerOptionsFromJson/Convert empty string option of libs array to compiler-options with json api.js	
+++ b/tests/baselines/reference/config/convertCompilerOptionsFromJson/Convert empty string option of libs array to compiler-options with json api.js	
@@ -30,5 +30,5 @@ CompilerOptions::
   "configFilePath": "/apath/tsconfig.json"
 }
 Errors::
-error TS6046: Argument for '--lib' option must be: 'es5', 'es6', 'es2015', 'es7', 'es2016', 'es2017', 'es2018', 'es2019', 'es2020', 'es2021', 'es2022', 'es2023', 'esnext', 'dom', 'dom.iterable', 'dom.asynciterable', 'webworker', 'webworker.importscripts', 'webworker.iterable', 'webworker.asynciterable', 'scripthost', 'es2015.core', 'es2015.collection', 'es2015.generator', 'es2015.iterable', 'es2015.promise', 'es2015.proxy', 'es2015.reflect', 'es2015.symbol', 'es2015.symbol.wellknown', 'es2016.array.include', 'es2016.intl', 'es2017.date', 'es2017.object', 'es2017.sharedmemory', 'es2017.string', 'es2017.intl', 'es2017.typedarrays', 'es2018.asyncgenerator', 'es2018.asynciterable', 'es2018.intl', 'es2018.promise', 'es2018.regexp', 'es2019.array', 'es2019.object', 'es2019.string', 'es2019.symbol', 'es2019.intl', 'es2020.bigint', 'es2020.date', 'es2020.promise', 'es2020.sharedmemory', 'es2020.string', 'es2020.symbol.wellknown', 'es2020.intl', 'es2020.number', 'es2021.promise', 'es2021.string', 'es2021.weakref', 'es2021.intl', 'es2022.array', 'es2022.error', 'es2022.intl', 'es2022.object', 'es2022.sharedmemory', 'es2022.string', 'es2022.regexp', 'es2023.array', 'es2023.collection', 'es2023.intl', 'esnext.array', 'esnext.collection', 'esnext.symbol', 'esnext.asynciterable', 'esnext.intl', 'esnext.disposable', 'esnext.bigint', 'esnext.string', 'esnext.promise', 'esnext.weakref', 'esnext.decorators', 'esnext.object', 'esnext.regexp', 'esnext.iterator', 'decorators', 'decorators.legacy'.
+error TS6046: Argument for '--lib' option must be: 'es5', 'es6', 'es2015', 'es7', 'es2016', 'es2017', 'es2018', 'es2019', 'es2020', 'es2021', 'es2022', 'es2023', 'esnext', 'dom', 'dom.iterable', 'dom.asynciterable', 'webworker', 'webworker.importscripts', 'webworker.iterable', 'webworker.asynciterable', 'scripthost', 'es2015.core', 'es2015.collection', 'es2015.generator', 'es2015.iterable', 'es2015.promise', 'es2015.proxy', 'es2015.reflect', 'es2015.symbol', 'es2015.symbol.wellknown', 'es2016.array.include', 'es2016.intl', 'es2017.date', 'es2017.object', 'es2017.sharedmemory', 'es2017.string', 'es2017.intl', 'es2017.typedarrays', 'es2018.asyncgenerator', 'es2018.asynciterable', 'es2018.intl', 'es2018.promise', 'es2018.regexp', 'es2019.array', 'es2019.object', 'es2019.string', 'es2019.symbol', 'es2019.intl', 'es2020.bigint', 'es2020.date', 'es2020.promise', 'es2020.sharedmemory', 'es2020.string', 'es2020.symbol.wellknown', 'es2020.intl', 'es2020.number', 'es2021.promise', 'es2021.string', 'es2021.weakref', 'es2021.intl', 'es2022.array', 'es2022.error', 'es2022.intl', 'es2022.object', 'es2022.sharedmemory', 'es2022.string', 'es2022.regexp', 'es2023.array', 'es2023.collection', 'es2023.intl', 'esnext.array', 'esnext.collection', 'esnext.symbol', 'esnext.asynciterable', 'esnext.intl', 'esnext.disposable', 'esnext.bigint', 'esnext.string', 'esnext.promise', 'esnext.weakref', 'esnext.decorators', 'esnext.object', 'esnext.regexp', 'decorators', 'decorators.legacy'.
 
diff --git a/tests/baselines/reference/config/convertCompilerOptionsFromJson/Convert empty string option of libs array to compiler-options with jsonSourceFile api.js b/tests/baselines/reference/config/convertCompilerOptionsFromJson/Convert empty string option of libs array to compiler-options with jsonSourceFile api.js
index 5166204b479ea..768504a015812 100644
--- a/tests/baselines/reference/config/convertCompilerOptionsFromJson/Convert empty string option of libs array to compiler-options with jsonSourceFile api.js	
+++ b/tests/baselines/reference/config/convertCompilerOptionsFromJson/Convert empty string option of libs array to compiler-options with jsonSourceFile api.js	
@@ -30,7 +30,7 @@ CompilerOptions::
   "configFilePath": "/apath/tsconfig.json"
 }
 Errors::
-tsconfig.json:8:7 - error TS6046: Argument for '--lib' option must be: 'es5', 'es6', 'es2015', 'es7', 'es2016', 'es2017', 'es2018', 'es2019', 'es2020', 'es2021', 'es2022', 'es2023', 'esnext', 'dom', 'dom.iterable', 'dom.asynciterable', 'webworker', 'webworker.importscripts', 'webworker.iterable', 'webworker.asynciterable', 'scripthost', 'es2015.core', 'es2015.collection', 'es2015.generator', 'es2015.iterable', 'es2015.promise', 'es2015.proxy', 'es2015.reflect', 'es2015.symbol', 'es2015.symbol.wellknown', 'es2016.array.include', 'es2016.intl', 'es2017.date', 'es2017.object', 'es2017.sharedmemory', 'es2017.string', 'es2017.intl', 'es2017.typedarrays', 'es2018.asyncgenerator', 'es2018.asynciterable', 'es2018.intl', 'es2018.promise', 'es2018.regexp', 'es2019.array', 'es2019.object', 'es2019.string', 'es2019.symbol', 'es2019.intl', 'es2020.bigint', 'es2020.date', 'es2020.promise', 'es2020.sharedmemory', 'es2020.string', 'es2020.symbol.wellknown', 'es2020.intl', 'es2020.number', 'es2021.promise', 'es2021.string', 'es2021.weakref', 'es2021.intl', 'es2022.array', 'es2022.error', 'es2022.intl', 'es2022.object', 'es2022.sharedmemory', 'es2022.string', 'es2022.regexp', 'es2023.array', 'es2023.collection', 'es2023.intl', 'esnext.array', 'esnext.collection', 'esnext.symbol', 'esnext.asynciterable', 'esnext.intl', 'esnext.disposable', 'esnext.bigint', 'esnext.string', 'esnext.promise', 'esnext.weakref', 'esnext.decorators', 'esnext.object', 'esnext.regexp', 'esnext.iterator', 'decorators', 'decorators.legacy'.
+tsconfig.json:8:7 - error TS6046: Argument for '--lib' option must be: 'es5', 'es6', 'es2015', 'es7', 'es2016', 'es2017', 'es2018', 'es2019', 'es2020', 'es2021', 'es2022', 'es2023', 'esnext', 'dom', 'dom.iterable', 'dom.asynciterable', 'webworker', 'webworker.importscripts', 'webworker.iterable', 'webworker.asynciterable', 'scripthost', 'es2015.core', 'es2015.collection', 'es2015.generator', 'es2015.iterable', 'es2015.promise', 'es2015.proxy', 'es2015.reflect', 'es2015.symbol', 'es2015.symbol.wellknown', 'es2016.array.include', 'es2016.intl', 'es2017.date', 'es2017.object', 'es2017.sharedmemory', 'es2017.string', 'es2017.intl', 'es2017.typedarrays', 'es2018.asyncgenerator', 'es2018.asynciterable', 'es2018.intl', 'es2018.promise', 'es2018.regexp', 'es2019.array', 'es2019.object', 'es2019.string', 'es2019.symbol', 'es2019.intl', 'es2020.bigint', 'es2020.date', 'es2020.promise', 'es2020.sharedmemory', 'es2020.string', 'es2020.symbol.wellknown', 'es2020.intl', 'es2020.number', 'es2021.promise', 'es2021.string', 'es2021.weakref', 'es2021.intl', 'es2022.array', 'es2022.error', 'es2022.intl', 'es2022.object', 'es2022.sharedmemory', 'es2022.string', 'es2022.regexp', 'es2023.array', 'es2023.collection', 'es2023.intl', 'esnext.array', 'esnext.collection', 'esnext.symbol', 'esnext.asynciterable', 'esnext.intl', 'esnext.disposable', 'esnext.bigint', 'esnext.string', 'esnext.promise', 'esnext.weakref', 'esnext.decorators', 'esnext.object', 'esnext.regexp', 'decorators', 'decorators.legacy'.
 
 8       ""
         ~~
diff --git a/tests/baselines/reference/config/convertCompilerOptionsFromJson/Convert empty string option of libs to compiler-options with json api.js b/tests/baselines/reference/config/convertCompilerOptionsFromJson/Convert empty string option of libs to compiler-options with json api.js
index 1256fcb0be357..12cd9f9a69f6e 100644
--- a/tests/baselines/reference/config/convertCompilerOptionsFromJson/Convert empty string option of libs to compiler-options with json api.js	
+++ b/tests/baselines/reference/config/convertCompilerOptionsFromJson/Convert empty string option of libs to compiler-options with json api.js	
@@ -33,5 +33,5 @@ CompilerOptions::
   "configFilePath": "/apath/tsconfig.json"
 }
 Errors::
-error TS6046: Argument for '--lib' option must be: 'es5', 'es6', 'es2015', 'es7', 'es2016', 'es2017', 'es2018', 'es2019', 'es2020', 'es2021', 'es2022', 'es2023', 'esnext', 'dom', 'dom.iterable', 'dom.asynciterable', 'webworker', 'webworker.importscripts', 'webworker.iterable', 'webworker.asynciterable', 'scripthost', 'es2015.core', 'es2015.collection', 'es2015.generator', 'es2015.iterable', 'es2015.promise', 'es2015.proxy', 'es2015.reflect', 'es2015.symbol', 'es2015.symbol.wellknown', 'es2016.array.include', 'es2016.intl', 'es2017.date', 'es2017.object', 'es2017.sharedmemory', 'es2017.string', 'es2017.intl', 'es2017.typedarrays', 'es2018.asyncgenerator', 'es2018.asynciterable', 'es2018.intl', 'es2018.promise', 'es2018.regexp', 'es2019.array', 'es2019.object', 'es2019.string', 'es2019.symbol', 'es2019.intl', 'es2020.bigint', 'es2020.date', 'es2020.promise', 'es2020.sharedmemory', 'es2020.string', 'es2020.symbol.wellknown', 'es2020.intl', 'es2020.number', 'es2021.promise', 'es2021.string', 'es2021.weakref', 'es2021.intl', 'es2022.array', 'es2022.error', 'es2022.intl', 'es2022.object', 'es2022.sharedmemory', 'es2022.string', 'es2022.regexp', 'es2023.array', 'es2023.collection', 'es2023.intl', 'esnext.array', 'esnext.collection', 'esnext.symbol', 'esnext.asynciterable', 'esnext.intl', 'esnext.disposable', 'esnext.bigint', 'esnext.string', 'esnext.promise', 'esnext.weakref', 'esnext.decorators', 'esnext.object', 'esnext.regexp', 'esnext.iterator', 'decorators', 'decorators.legacy'.
+error TS6046: Argument for '--lib' option must be: 'es5', 'es6', 'es2015', 'es7', 'es2016', 'es2017', 'es2018', 'es2019', 'es2020', 'es2021', 'es2022', 'es2023', 'esnext', 'dom', 'dom.iterable', 'dom.asynciterable', 'webworker', 'webworker.importscripts', 'webworker.iterable', 'webworker.asynciterable', 'scripthost', 'es2015.core', 'es2015.collection', 'es2015.generator', 'es2015.iterable', 'es2015.promise', 'es2015.proxy', 'es2015.reflect', 'es2015.symbol', 'es2015.symbol.wellknown', 'es2016.array.include', 'es2016.intl', 'es2017.date', 'es2017.object', 'es2017.sharedmemory', 'es2017.string', 'es2017.intl', 'es2017.typedarrays', 'es2018.asyncgenerator', 'es2018.asynciterable', 'es2018.intl', 'es2018.promise', 'es2018.regexp', 'es2019.array', 'es2019.object', 'es2019.string', 'es2019.symbol', 'es2019.intl', 'es2020.bigint', 'es2020.date', 'es2020.promise', 'es2020.sharedmemory', 'es2020.string', 'es2020.symbol.wellknown', 'es2020.intl', 'es2020.number', 'es2021.promise', 'es2021.string', 'es2021.weakref', 'es2021.intl', 'es2022.array', 'es2022.error', 'es2022.intl', 'es2022.object', 'es2022.sharedmemory', 'es2022.string', 'es2022.regexp', 'es2023.array', 'es2023.collection', 'es2023.intl', 'esnext.array', 'esnext.collection', 'esnext.symbol', 'esnext.asynciterable', 'esnext.intl', 'esnext.disposable', 'esnext.bigint', 'esnext.string', 'esnext.promise', 'esnext.weakref', 'esnext.decorators', 'esnext.object', 'esnext.regexp', 'decorators', 'decorators.legacy'.
 
diff --git a/tests/baselines/reference/config/convertCompilerOptionsFromJson/Convert empty string option of libs to compiler-options with jsonSourceFile api.js b/tests/baselines/reference/config/convertCompilerOptionsFromJson/Convert empty string option of libs to compiler-options with jsonSourceFile api.js
index db849a0aecc78..b220f686852a8 100644
--- a/tests/baselines/reference/config/convertCompilerOptionsFromJson/Convert empty string option of libs to compiler-options with jsonSourceFile api.js	
+++ b/tests/baselines/reference/config/convertCompilerOptionsFromJson/Convert empty string option of libs to compiler-options with jsonSourceFile api.js	
@@ -33,7 +33,7 @@ CompilerOptions::
   "configFilePath": "/apath/tsconfig.json"
 }
 Errors::
-tsconfig.json:9:7 - error TS6046: Argument for '--lib' option must be: 'es5', 'es6', 'es2015', 'es7', 'es2016', 'es2017', 'es2018', 'es2019', 'es2020', 'es2021', 'es2022', 'es2023', 'esnext', 'dom', 'dom.iterable', 'dom.asynciterable', 'webworker', 'webworker.importscripts', 'webworker.iterable', 'webworker.asynciterable', 'scripthost', 'es2015.core', 'es2015.collection', 'es2015.generator', 'es2015.iterable', 'es2015.promise', 'es2015.proxy', 'es2015.reflect', 'es2015.symbol', 'es2015.symbol.wellknown', 'es2016.array.include', 'es2016.intl', 'es2017.date', 'es2017.object', 'es2017.sharedmemory', 'es2017.string', 'es2017.intl', 'es2017.typedarrays', 'es2018.asyncgenerator', 'es2018.asynciterable', 'es2018.intl', 'es2018.promise', 'es2018.regexp', 'es2019.array', 'es2019.object', 'es2019.string', 'es2019.symbol', 'es2019.intl', 'es2020.bigint', 'es2020.date', 'es2020.promise', 'es2020.sharedmemory', 'es2020.string', 'es2020.symbol.wellknown', 'es2020.intl', 'es2020.number', 'es2021.promise', 'es2021.string', 'es2021.weakref', 'es2021.intl', 'es2022.array', 'es2022.error', 'es2022.intl', 'es2022.object', 'es2022.sharedmemory', 'es2022.string', 'es2022.regexp', 'es2023.array', 'es2023.collection', 'es2023.intl', 'esnext.array', 'esnext.collection', 'esnext.symbol', 'esnext.asynciterable', 'esnext.intl', 'esnext.disposable', 'esnext.bigint', 'esnext.string', 'esnext.promise', 'esnext.weakref', 'esnext.decorators', 'esnext.object', 'esnext.regexp', 'esnext.iterator', 'decorators', 'decorators.legacy'.
+tsconfig.json:9:7 - error TS6046: Argument for '--lib' option must be: 'es5', 'es6', 'es2015', 'es7', 'es2016', 'es2017', 'es2018', 'es2019', 'es2020', 'es2021', 'es2022', 'es2023', 'esnext', 'dom', 'dom.iterable', 'dom.asynciterable', 'webworker', 'webworker.importscripts', 'webworker.iterable', 'webworker.asynciterable', 'scripthost', 'es2015.core', 'es2015.collection', 'es2015.generator', 'es2015.iterable', 'es2015.promise', 'es2015.proxy', 'es2015.reflect', 'es2015.symbol', 'es2015.symbol.wellknown', 'es2016.array.include', 'es2016.intl', 'es2017.date', 'es2017.object', 'es2017.sharedmemory', 'es2017.string', 'es2017.intl', 'es2017.typedarrays', 'es2018.asyncgenerator', 'es2018.asynciterable', 'es2018.intl', 'es2018.promise', 'es2018.regexp', 'es2019.array', 'es2019.object', 'es2019.string', 'es2019.symbol', 'es2019.intl', 'es2020.bigint', 'es2020.date', 'es2020.promise', 'es2020.sharedmemory', 'es2020.string', 'es2020.symbol.wellknown', 'es2020.intl', 'es2020.number', 'es2021.promise', 'es2021.string', 'es2021.weakref', 'es2021.intl', 'es2022.array', 'es2022.error', 'es2022.intl', 'es2022.object', 'es2022.sharedmemory', 'es2022.string', 'es2022.regexp', 'es2023.array', 'es2023.collection', 'es2023.intl', 'esnext.array', 'esnext.collection', 'esnext.symbol', 'esnext.asynciterable', 'esnext.intl', 'esnext.disposable', 'esnext.bigint', 'esnext.string', 'esnext.promise', 'esnext.weakref', 'esnext.decorators', 'esnext.object', 'esnext.regexp', 'decorators', 'decorators.legacy'.
 
 9       ""
         ~~
diff --git a/tests/baselines/reference/config/convertCompilerOptionsFromJson/Convert incorrect option of libs to compiler-options with json api.js b/tests/baselines/reference/config/convertCompilerOptionsFromJson/Convert incorrect option of libs to compiler-options with json api.js
index e1d795e42bd20..53df38f31b261 100644
--- a/tests/baselines/reference/config/convertCompilerOptionsFromJson/Convert incorrect option of libs to compiler-options with json api.js	
+++ b/tests/baselines/reference/config/convertCompilerOptionsFromJson/Convert incorrect option of libs to compiler-options with json api.js	
@@ -35,5 +35,5 @@ CompilerOptions::
   "configFilePath": "/apath/tsconfig.json"
 }
 Errors::
-error TS6046: Argument for '--lib' option must be: 'es5', 'es6', 'es2015', 'es7', 'es2016', 'es2017', 'es2018', 'es2019', 'es2020', 'es2021', 'es2022', 'es2023', 'esnext', 'dom', 'dom.iterable', 'dom.asynciterable', 'webworker', 'webworker.importscripts', 'webworker.iterable', 'webworker.asynciterable', 'scripthost', 'es2015.core', 'es2015.collection', 'es2015.generator', 'es2015.iterable', 'es2015.promise', 'es2015.proxy', 'es2015.reflect', 'es2015.symbol', 'es2015.symbol.wellknown', 'es2016.array.include', 'es2016.intl', 'es2017.date', 'es2017.object', 'es2017.sharedmemory', 'es2017.string', 'es2017.intl', 'es2017.typedarrays', 'es2018.asyncgenerator', 'es2018.asynciterable', 'es2018.intl', 'es2018.promise', 'es2018.regexp', 'es2019.array', 'es2019.object', 'es2019.string', 'es2019.symbol', 'es2019.intl', 'es2020.bigint', 'es2020.date', 'es2020.promise', 'es2020.sharedmemory', 'es2020.string', 'es2020.symbol.wellknown', 'es2020.intl', 'es2020.number', 'es2021.promise', 'es2021.string', 'es2021.weakref', 'es2021.intl', 'es2022.array', 'es2022.error', 'es2022.intl', 'es2022.object', 'es2022.sharedmemory', 'es2022.string', 'es2022.regexp', 'es2023.array', 'es2023.collection', 'es2023.intl', 'esnext.array', 'esnext.collection', 'esnext.symbol', 'esnext.asynciterable', 'esnext.intl', 'esnext.disposable', 'esnext.bigint', 'esnext.string', 'esnext.promise', 'esnext.weakref', 'esnext.decorators', 'esnext.object', 'esnext.regexp', 'esnext.iterator', 'decorators', 'decorators.legacy'.
+error TS6046: Argument for '--lib' option must be: 'es5', 'es6', 'es2015', 'es7', 'es2016', 'es2017', 'es2018', 'es2019', 'es2020', 'es2021', 'es2022', 'es2023', 'esnext', 'dom', 'dom.iterable', 'dom.asynciterable', 'webworker', 'webworker.importscripts', 'webworker.iterable', 'webworker.asynciterable', 'scripthost', 'es2015.core', 'es2015.collection', 'es2015.generator', 'es2015.iterable', 'es2015.promise', 'es2015.proxy', 'es2015.reflect', 'es2015.symbol', 'es2015.symbol.wellknown', 'es2016.array.include', 'es2016.intl', 'es2017.date', 'es2017.object', 'es2017.sharedmemory', 'es2017.string', 'es2017.intl', 'es2017.typedarrays', 'es2018.asyncgenerator', 'es2018.asynciterable', 'es2018.intl', 'es2018.promise', 'es2018.regexp', 'es2019.array', 'es2019.object', 'es2019.string', 'es2019.symbol', 'es2019.intl', 'es2020.bigint', 'es2020.date', 'es2020.promise', 'es2020.sharedmemory', 'es2020.string', 'es2020.symbol.wellknown', 'es2020.intl', 'es2020.number', 'es2021.promise', 'es2021.string', 'es2021.weakref', 'es2021.intl', 'es2022.array', 'es2022.error', 'es2022.intl', 'es2022.object', 'es2022.sharedmemory', 'es2022.string', 'es2022.regexp', 'es2023.array', 'es2023.collection', 'es2023.intl', 'esnext.array', 'esnext.collection', 'esnext.symbol', 'esnext.asynciterable', 'esnext.intl', 'esnext.disposable', 'esnext.bigint', 'esnext.string', 'esnext.promise', 'esnext.weakref', 'esnext.decorators', 'esnext.object', 'esnext.regexp', 'decorators', 'decorators.legacy'.
 
diff --git a/tests/baselines/reference/config/convertCompilerOptionsFromJson/Convert incorrect option of libs to compiler-options with jsonSourceFile api.js b/tests/baselines/reference/config/convertCompilerOptionsFromJson/Convert incorrect option of libs to compiler-options with jsonSourceFile api.js
index 21f96c3a576ad..d528f18a59522 100644
--- a/tests/baselines/reference/config/convertCompilerOptionsFromJson/Convert incorrect option of libs to compiler-options with jsonSourceFile api.js	
+++ b/tests/baselines/reference/config/convertCompilerOptionsFromJson/Convert incorrect option of libs to compiler-options with jsonSourceFile api.js	
@@ -35,7 +35,7 @@ CompilerOptions::
   "configFilePath": "/apath/tsconfig.json"
 }
 Errors::
-tsconfig.json:10:7 - error TS6046: Argument for '--lib' option must be: 'es5', 'es6', 'es2015', 'es7', 'es2016', 'es2017', 'es2018', 'es2019', 'es2020', 'es2021', 'es2022', 'es2023', 'esnext', 'dom', 'dom.iterable', 'dom.asynciterable', 'webworker', 'webworker.importscripts', 'webworker.iterable', 'webworker.asynciterable', 'scripthost', 'es2015.core', 'es2015.collection', 'es2015.generator', 'es2015.iterable', 'es2015.promise', 'es2015.proxy', 'es2015.reflect', 'es2015.symbol', 'es2015.symbol.wellknown', 'es2016.array.include', 'es2016.intl', 'es2017.date', 'es2017.object', 'es2017.sharedmemory', 'es2017.string', 'es2017.intl', 'es2017.typedarrays', 'es2018.asyncgenerator', 'es2018.asynciterable', 'es2018.intl', 'es2018.promise', 'es2018.regexp', 'es2019.array', 'es2019.object', 'es2019.string', 'es2019.symbol', 'es2019.intl', 'es2020.bigint', 'es2020.date', 'es2020.promise', 'es2020.sharedmemory', 'es2020.string', 'es2020.symbol.wellknown', 'es2020.intl', 'es2020.number', 'es2021.promise', 'es2021.string', 'es2021.weakref', 'es2021.intl', 'es2022.array', 'es2022.error', 'es2022.intl', 'es2022.object', 'es2022.sharedmemory', 'es2022.string', 'es2022.regexp', 'es2023.array', 'es2023.collection', 'es2023.intl', 'esnext.array', 'esnext.collection', 'esnext.symbol', 'esnext.asynciterable', 'esnext.intl', 'esnext.disposable', 'esnext.bigint', 'esnext.string', 'esnext.promise', 'esnext.weakref', 'esnext.decorators', 'esnext.object', 'esnext.regexp', 'esnext.iterator', 'decorators', 'decorators.legacy'.
+tsconfig.json:10:7 - error TS6046: Argument for '--lib' option must be: 'es5', 'es6', 'es2015', 'es7', 'es2016', 'es2017', 'es2018', 'es2019', 'es2020', 'es2021', 'es2022', 'es2023', 'esnext', 'dom', 'dom.iterable', 'dom.asynciterable', 'webworker', 'webworker.importscripts', 'webworker.iterable', 'webworker.asynciterable', 'scripthost', 'es2015.core', 'es2015.collection', 'es2015.generator', 'es2015.iterable', 'es2015.promise', 'es2015.proxy', 'es2015.reflect', 'es2015.symbol', 'es2015.symbol.wellknown', 'es2016.array.include', 'es2016.intl', 'es2017.date', 'es2017.object', 'es2017.sharedmemory', 'es2017.string', 'es2017.intl', 'es2017.typedarrays', 'es2018.asyncgenerator', 'es2018.asynciterable', 'es2018.intl', 'es2018.promise', 'es2018.regexp', 'es2019.array', 'es2019.object', 'es2019.string', 'es2019.symbol', 'es2019.intl', 'es2020.bigint', 'es2020.date', 'es2020.promise', 'es2020.sharedmemory', 'es2020.string', 'es2020.symbol.wellknown', 'es2020.intl', 'es2020.number', 'es2021.promise', 'es2021.string', 'es2021.weakref', 'es2021.intl', 'es2022.array', 'es2022.error', 'es2022.intl', 'es2022.object', 'es2022.sharedmemory', 'es2022.string', 'es2022.regexp', 'es2023.array', 'es2023.collection', 'es2023.intl', 'esnext.array', 'esnext.collection', 'esnext.symbol', 'esnext.asynciterable', 'esnext.intl', 'esnext.disposable', 'esnext.bigint', 'esnext.string', 'esnext.promise', 'esnext.weakref', 'esnext.decorators', 'esnext.object', 'esnext.regexp', 'decorators', 'decorators.legacy'.
 
 10       "incorrectLib"
          ~~~~~~~~~~~~~~
diff --git a/tests/baselines/reference/config/convertCompilerOptionsFromJson/Convert trailing-whitespace string option of libs to compiler-options with json api.js b/tests/baselines/reference/config/convertCompilerOptionsFromJson/Convert trailing-whitespace string option of libs to compiler-options with json api.js
index b4f79a2e2c1f5..910344faabca5 100644
--- a/tests/baselines/reference/config/convertCompilerOptionsFromJson/Convert trailing-whitespace string option of libs to compiler-options with json api.js	
+++ b/tests/baselines/reference/config/convertCompilerOptionsFromJson/Convert trailing-whitespace string option of libs to compiler-options with json api.js	
@@ -30,5 +30,5 @@ CompilerOptions::
   "configFilePath": "/apath/tsconfig.json"
 }
 Errors::
-error TS6046: Argument for '--lib' option must be: 'es5', 'es6', 'es2015', 'es7', 'es2016', 'es2017', 'es2018', 'es2019', 'es2020', 'es2021', 'es2022', 'es2023', 'esnext', 'dom', 'dom.iterable', 'dom.asynciterable', 'webworker', 'webworker.importscripts', 'webworker.iterable', 'webworker.asynciterable', 'scripthost', 'es2015.core', 'es2015.collection', 'es2015.generator', 'es2015.iterable', 'es2015.promise', 'es2015.proxy', 'es2015.reflect', 'es2015.symbol', 'es2015.symbol.wellknown', 'es2016.array.include', 'es2016.intl', 'es2017.date', 'es2017.object', 'es2017.sharedmemory', 'es2017.string', 'es2017.intl', 'es2017.typedarrays', 'es2018.asyncgenerator', 'es2018.asynciterable', 'es2018.intl', 'es2018.promise', 'es2018.regexp', 'es2019.array', 'es2019.object', 'es2019.string', 'es2019.symbol', 'es2019.intl', 'es2020.bigint', 'es2020.date', 'es2020.promise', 'es2020.sharedmemory', 'es2020.string', 'es2020.symbol.wellknown', 'es2020.intl', 'es2020.number', 'es2021.promise', 'es2021.string', 'es2021.weakref', 'es2021.intl', 'es2022.array', 'es2022.error', 'es2022.intl', 'es2022.object', 'es2022.sharedmemory', 'es2022.string', 'es2022.regexp', 'es2023.array', 'es2023.collection', 'es2023.intl', 'esnext.array', 'esnext.collection', 'esnext.symbol', 'esnext.asynciterable', 'esnext.intl', 'esnext.disposable', 'esnext.bigint', 'esnext.string', 'esnext.promise', 'esnext.weakref', 'esnext.decorators', 'esnext.object', 'esnext.regexp', 'esnext.iterator', 'decorators', 'decorators.legacy'.
+error TS6046: Argument for '--lib' option must be: 'es5', 'es6', 'es2015', 'es7', 'es2016', 'es2017', 'es2018', 'es2019', 'es2020', 'es2021', 'es2022', 'es2023', 'esnext', 'dom', 'dom.iterable', 'dom.asynciterable', 'webworker', 'webworker.importscripts', 'webworker.iterable', 'webworker.asynciterable', 'scripthost', 'es2015.core', 'es2015.collection', 'es2015.generator', 'es2015.iterable', 'es2015.promise', 'es2015.proxy', 'es2015.reflect', 'es2015.symbol', 'es2015.symbol.wellknown', 'es2016.array.include', 'es2016.intl', 'es2017.date', 'es2017.object', 'es2017.sharedmemory', 'es2017.string', 'es2017.intl', 'es2017.typedarrays', 'es2018.asyncgenerator', 'es2018.asynciterable', 'es2018.intl', 'es2018.promise', 'es2018.regexp', 'es2019.array', 'es2019.object', 'es2019.string', 'es2019.symbol', 'es2019.intl', 'es2020.bigint', 'es2020.date', 'es2020.promise', 'es2020.sharedmemory', 'es2020.string', 'es2020.symbol.wellknown', 'es2020.intl', 'es2020.number', 'es2021.promise', 'es2021.string', 'es2021.weakref', 'es2021.intl', 'es2022.array', 'es2022.error', 'es2022.intl', 'es2022.object', 'es2022.sharedmemory', 'es2022.string', 'es2022.regexp', 'es2023.array', 'es2023.collection', 'es2023.intl', 'esnext.array', 'esnext.collection', 'esnext.symbol', 'esnext.asynciterable', 'esnext.intl', 'esnext.disposable', 'esnext.bigint', 'esnext.string', 'esnext.promise', 'esnext.weakref', 'esnext.decorators', 'esnext.object', 'esnext.regexp', 'decorators', 'decorators.legacy'.
 
diff --git a/tests/baselines/reference/config/convertCompilerOptionsFromJson/Convert trailing-whitespace string option of libs to compiler-options with jsonSourceFile api.js b/tests/baselines/reference/config/convertCompilerOptionsFromJson/Convert trailing-whitespace string option of libs to compiler-options with jsonSourceFile api.js
index 8c18f04855e76..0878868862dc7 100644
--- a/tests/baselines/reference/config/convertCompilerOptionsFromJson/Convert trailing-whitespace string option of libs to compiler-options with jsonSourceFile api.js	
+++ b/tests/baselines/reference/config/convertCompilerOptionsFromJson/Convert trailing-whitespace string option of libs to compiler-options with jsonSourceFile api.js	
@@ -30,7 +30,7 @@ CompilerOptions::
   "configFilePath": "/apath/tsconfig.json"
 }
 Errors::
-tsconfig.json:8:7 - error TS6046: Argument for '--lib' option must be: 'es5', 'es6', 'es2015', 'es7', 'es2016', 'es2017', 'es2018', 'es2019', 'es2020', 'es2021', 'es2022', 'es2023', 'esnext', 'dom', 'dom.iterable', 'dom.asynciterable', 'webworker', 'webworker.importscripts', 'webworker.iterable', 'webworker.asynciterable', 'scripthost', 'es2015.core', 'es2015.collection', 'es2015.generator', 'es2015.iterable', 'es2015.promise', 'es2015.proxy', 'es2015.reflect', 'es2015.symbol', 'es2015.symbol.wellknown', 'es2016.array.include', 'es2016.intl', 'es2017.date', 'es2017.object', 'es2017.sharedmemory', 'es2017.string', 'es2017.intl', 'es2017.typedarrays', 'es2018.asyncgenerator', 'es2018.asynciterable', 'es2018.intl', 'es2018.promise', 'es2018.regexp', 'es2019.array', 'es2019.object', 'es2019.string', 'es2019.symbol', 'es2019.intl', 'es2020.bigint', 'es2020.date', 'es2020.promise', 'es2020.sharedmemory', 'es2020.string', 'es2020.symbol.wellknown', 'es2020.intl', 'es2020.number', 'es2021.promise', 'es2021.string', 'es2021.weakref', 'es2021.intl', 'es2022.array', 'es2022.error', 'es2022.intl', 'es2022.object', 'es2022.sharedmemory', 'es2022.string', 'es2022.regexp', 'es2023.array', 'es2023.collection', 'es2023.intl', 'esnext.array', 'esnext.collection', 'esnext.symbol', 'esnext.asynciterable', 'esnext.intl', 'esnext.disposable', 'esnext.bigint', 'esnext.string', 'esnext.promise', 'esnext.weakref', 'esnext.decorators', 'esnext.object', 'esnext.regexp', 'esnext.iterator', 'decorators', 'decorators.legacy'.
+tsconfig.json:8:7 - error TS6046: Argument for '--lib' option must be: 'es5', 'es6', 'es2015', 'es7', 'es2016', 'es2017', 'es2018', 'es2019', 'es2020', 'es2021', 'es2022', 'es2023', 'esnext', 'dom', 'dom.iterable', 'dom.asynciterable', 'webworker', 'webworker.importscripts', 'webworker.iterable', 'webworker.asynciterable', 'scripthost', 'es2015.core', 'es2015.collection', 'es2015.generator', 'es2015.iterable', 'es2015.promise', 'es2015.proxy', 'es2015.reflect', 'es2015.symbol', 'es2015.symbol.wellknown', 'es2016.array.include', 'es2016.intl', 'es2017.date', 'es2017.object', 'es2017.sharedmemory', 'es2017.string', 'es2017.intl', 'es2017.typedarrays', 'es2018.asyncgenerator', 'es2018.asynciterable', 'es2018.intl', 'es2018.promise', 'es2018.regexp', 'es2019.array', 'es2019.object', 'es2019.string', 'es2019.symbol', 'es2019.intl', 'es2020.bigint', 'es2020.date', 'es2020.promise', 'es2020.sharedmemory', 'es2020.string', 'es2020.symbol.wellknown', 'es2020.intl', 'es2020.number', 'es2021.promise', 'es2021.string', 'es2021.weakref', 'es2021.intl', 'es2022.array', 'es2022.error', 'es2022.intl', 'es2022.object', 'es2022.sharedmemory', 'es2022.string', 'es2022.regexp', 'es2023.array', 'es2023.collection', 'es2023.intl', 'esnext.array', 'esnext.collection', 'esnext.symbol', 'esnext.asynciterable', 'esnext.intl', 'esnext.disposable', 'esnext.bigint', 'esnext.string', 'esnext.promise', 'esnext.weakref', 'esnext.decorators', 'esnext.object', 'esnext.regexp', 'decorators', 'decorators.legacy'.
 
 8       "   "
         ~~~~~
diff --git a/tests/baselines/reference/contextuallyTypeGeneratorReturnTypeFromUnion.symbols b/tests/baselines/reference/contextuallyTypeGeneratorReturnTypeFromUnion.symbols
index e6777b2b2eeb1..f1cb7ae700245 100644
--- a/tests/baselines/reference/contextuallyTypeGeneratorReturnTypeFromUnion.symbols
+++ b/tests/baselines/reference/contextuallyTypeGeneratorReturnTypeFromUnion.symbols
@@ -5,7 +5,7 @@
 
 type Action = () => (Generator<string, string, string[]> | string)
 >Action : Symbol(Action, Decl(contextuallyTypeGeneratorReturnTypeFromUnion.ts, 0, 0))
->Generator : Symbol(Generator, Decl(lib.es2015.generator.d.ts, --, --), Decl(lib.esnext.iterator.d.ts, --, --))
+>Generator : Symbol(Generator, Decl(lib.es2015.generator.d.ts, --, --))
 
 const test1: Action = function* () {
 >test1 : Symbol(test1, Decl(contextuallyTypeGeneratorReturnTypeFromUnion.ts, 4, 5))
diff --git a/tests/baselines/reference/dependentDestructuredVariables.symbols b/tests/baselines/reference/dependentDestructuredVariables.symbols
index b89295307c2f4..ae71b255d1a88 100644
--- a/tests/baselines/reference/dependentDestructuredVariables.symbols
+++ b/tests/baselines/reference/dependentDestructuredVariables.symbols
@@ -380,7 +380,7 @@ interface B<T> { variant: 'b', value: Array<T> }
 >T : Symbol(T, Decl(dependentDestructuredVariables.ts, 148, 12))
 >variant : Symbol(B.variant, Decl(dependentDestructuredVariables.ts, 148, 16))
 >value : Symbol(B.value, Decl(dependentDestructuredVariables.ts, 148, 30))
->Array : Symbol(Array, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.symbol.wellknown.d.ts, --, --) ... and 5 more)
+>Array : Symbol(Array, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.symbol.wellknown.d.ts, --, --) ... and 4 more)
 >T : Symbol(T, Decl(dependentDestructuredVariables.ts, 148, 12))
 
 type AB<T> = A<T> | B<T>;
@@ -401,7 +401,7 @@ declare function printValueList<T>(t: Array<T>): void;
 >printValueList : Symbol(printValueList, Decl(dependentDestructuredVariables.ts, 152, 43))
 >T : Symbol(T, Decl(dependentDestructuredVariables.ts, 154, 32))
 >t : Symbol(t, Decl(dependentDestructuredVariables.ts, 154, 35))
->Array : Symbol(Array, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.symbol.wellknown.d.ts, --, --) ... and 5 more)
+>Array : Symbol(Array, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.symbol.wellknown.d.ts, --, --) ... and 4 more)
 >T : Symbol(T, Decl(dependentDestructuredVariables.ts, 154, 32))
 
 function unrefined1<T>(ab: AB<T>): void {
@@ -477,7 +477,7 @@ const reducerBroken = (state: number, { type, payload }: Action3) => {
 
 declare var it: Iterator<number>;
 >it : Symbol(it, Decl(dependentDestructuredVariables.ts, 183, 11))
->Iterator : Symbol(Iterator, Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.esnext.iterator.d.ts, --, --))
+>Iterator : Symbol(Iterator, Decl(lib.es2015.iterable.d.ts, --, --))
 
 const { value, done } = it.next();
 >value : Symbol(value, Decl(dependentDestructuredVariables.ts, 184, 7))
@@ -747,7 +747,7 @@ type FooGenMethod = {
 >e : Symbol(e, Decl(dependentDestructuredVariables.ts, 286, 23))
 
   ): Generator<any, any, any>;
->Generator : Symbol(Generator, Decl(lib.es2015.generator.d.ts, --, --), Decl(lib.esnext.iterator.d.ts, --, --))
+>Generator : Symbol(Generator, Decl(lib.es2015.generator.d.ts, --, --))
 }
 
 let fooGenM: FooGenMethod = {
diff --git a/tests/baselines/reference/dependentDestructuredVariables.types b/tests/baselines/reference/dependentDestructuredVariables.types
index 23830ab53191b..9591df821a053 100644
--- a/tests/baselines/reference/dependentDestructuredVariables.types
+++ b/tests/baselines/reference/dependentDestructuredVariables.types
@@ -2,7 +2,7 @@
 
 === Performance Stats ===
 Type Count: 2,500
-Instantiation count: 2,500
+Instantiation count: 1,000
 
 === dependentDestructuredVariables.ts ===
 type Action =
diff --git a/tests/baselines/reference/dependentDestructuredVariablesFromNestedPatterns.types b/tests/baselines/reference/dependentDestructuredVariablesFromNestedPatterns.types
index 798411ef7ec3d..562ada922367b 100644
--- a/tests/baselines/reference/dependentDestructuredVariablesFromNestedPatterns.types
+++ b/tests/baselines/reference/dependentDestructuredVariablesFromNestedPatterns.types
@@ -60,11 +60,11 @@ async function myAllSettled<T extends readonly unknown[]>(fn: () => T) {
 >                               :   ^                                                               
 >Promise.allSettled(fn()) : Promise<{ -readonly [P in keyof T]: PromiseSettledResult<Awaited<T[P]>>; }>
 >                         : ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
->Promise.allSettled : { <T_1 extends [] | readonly unknown[]>(values: T_1): Promise<{ -readonly [P in keyof T_1]: PromiseSettledResult<Awaited<T_1[P]>>; }>; <T_2>(values: Iterable<T_2 | PromiseLike<T_2>>): Promise<PromiseSettledResult<Awaited<T_2>>[]>; }
+>Promise.allSettled : { <T_1 extends readonly unknown[] | []>(values: T_1): Promise<{ -readonly [P in keyof T_1]: PromiseSettledResult<Awaited<T_1[P]>>; }>; <T_2>(values: Iterable<T_2 | PromiseLike<T_2>>): Promise<PromiseSettledResult<Awaited<T_2>>[]>; }
 >                   : ^^^   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^      ^^   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^   ^^      ^^                                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 >Promise : PromiseConstructor
 >        : ^^^^^^^^^^^^^^^^^^
->allSettled : { <T_1 extends [] | readonly unknown[]>(values: T_1): Promise<{ -readonly [P in keyof T_1]: PromiseSettledResult<Awaited<T_1[P]>>; }>; <T_2>(values: Iterable<T_2 | PromiseLike<T_2>>): Promise<PromiseSettledResult<Awaited<T_2>>[]>; }
+>allSettled : { <T_1 extends readonly unknown[] | []>(values: T_1): Promise<{ -readonly [P in keyof T_1]: PromiseSettledResult<Awaited<T_1[P]>>; }>; <T_2>(values: Iterable<T_2 | PromiseLike<T_2>>): Promise<PromiseSettledResult<Awaited<T_2>>[]>; }
 >           : ^^^   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^      ^^   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^   ^^      ^^                                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 >fn() : T
 >     : ^
diff --git a/tests/baselines/reference/esNextWeakRefs_IterableWeakMap.symbols b/tests/baselines/reference/esNextWeakRefs_IterableWeakMap.symbols
index 722d7bb690d9b..5af85b38568d1 100644
--- a/tests/baselines/reference/esNextWeakRefs_IterableWeakMap.symbols
+++ b/tests/baselines/reference/esNextWeakRefs_IterableWeakMap.symbols
@@ -239,7 +239,7 @@ export class IterableWeakMap<K extends object, V> implements WeakMap<K, V> {
 
     *entries(): Generator<[key: K, value: V], void> {
 >entries : Symbol(IterableWeakMap.entries, Decl(esNextWeakRefs_IterableWeakMap.ts, 62, 47))
->Generator : Symbol(Generator, Decl(lib.es2015.generator.d.ts, --, --), Decl(lib.esnext.iterator.d.ts, --, --))
+>Generator : Symbol(Generator, Decl(lib.es2015.generator.d.ts, --, --))
 >K : Symbol(K, Decl(esNextWeakRefs_IterableWeakMap.ts, 9, 29))
 >V : Symbol(V, Decl(esNextWeakRefs_IterableWeakMap.ts, 9, 46))
 
diff --git a/tests/baselines/reference/flatArrayNoExcessiveStackDepth.symbols b/tests/baselines/reference/flatArrayNoExcessiveStackDepth.symbols
index aee177c3e7005..839a089eac091 100644
--- a/tests/baselines/reference/flatArrayNoExcessiveStackDepth.symbols
+++ b/tests/baselines/reference/flatArrayNoExcessiveStackDepth.symbols
@@ -17,7 +17,7 @@ const bar = foo.flatMap(bar => bar as Foo);
 
 interface Foo extends Array<string> {}
 >Foo : Symbol(Foo, Decl(flatArrayNoExcessiveStackDepth.ts, 3, 43))
->Array : Symbol(Array, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.symbol.wellknown.d.ts, --, --) ... and 5 more)
+>Array : Symbol(Array, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.symbol.wellknown.d.ts, --, --) ... and 4 more)
 
 // Repros from comments in #43249
 
diff --git a/tests/baselines/reference/generatorAssignability.symbols b/tests/baselines/reference/generatorAssignability.symbols
index c72f31ddbac9c..78b8c6d36a427 100644
--- a/tests/baselines/reference/generatorAssignability.symbols
+++ b/tests/baselines/reference/generatorAssignability.symbols
@@ -6,15 +6,15 @@ declare let _: any;
 
 declare const g1: Generator<number, void, string>;
 >g1 : Symbol(g1, Decl(generatorAssignability.ts, 1, 13))
->Generator : Symbol(Generator, Decl(lib.es2015.generator.d.ts, --, --), Decl(lib.esnext.iterator.d.ts, --, --))
+>Generator : Symbol(Generator, Decl(lib.es2015.generator.d.ts, --, --))
 
 declare const g2: Generator<number, void, undefined>;
 >g2 : Symbol(g2, Decl(generatorAssignability.ts, 2, 13))
->Generator : Symbol(Generator, Decl(lib.es2015.generator.d.ts, --, --), Decl(lib.esnext.iterator.d.ts, --, --))
+>Generator : Symbol(Generator, Decl(lib.es2015.generator.d.ts, --, --))
 
 declare const g3: Generator<number, void, boolean>;
 >g3 : Symbol(g3, Decl(generatorAssignability.ts, 3, 13))
->Generator : Symbol(Generator, Decl(lib.es2015.generator.d.ts, --, --), Decl(lib.esnext.iterator.d.ts, --, --))
+>Generator : Symbol(Generator, Decl(lib.es2015.generator.d.ts, --, --))
 
 declare const g4: AsyncGenerator<number, void, string>;
 >g4 : Symbol(g4, Decl(generatorAssignability.ts, 4, 13))
@@ -104,7 +104,7 @@ async function asyncfn() {
 
 function* f1(): Generator<number, void, boolean> {
 >f1 : Symbol(f1, Decl(generatorAssignability.ts, 40, 1))
->Generator : Symbol(Generator, Decl(lib.es2015.generator.d.ts, --, --), Decl(lib.esnext.iterator.d.ts, --, --))
+>Generator : Symbol(Generator, Decl(lib.es2015.generator.d.ts, --, --))
 
     // yield* over iterable
     yield* g1; // error
diff --git a/tests/baselines/reference/generatorExplicitReturnType.symbols b/tests/baselines/reference/generatorExplicitReturnType.symbols
index a52d505506220..3b4841c78016c 100644
--- a/tests/baselines/reference/generatorExplicitReturnType.symbols
+++ b/tests/baselines/reference/generatorExplicitReturnType.symbols
@@ -3,7 +3,7 @@
 === generatorExplicitReturnType.ts ===
 function* g1(): Generator<number, boolean, string> {
 >g1 : Symbol(g1, Decl(generatorExplicitReturnType.ts, 0, 0))
->Generator : Symbol(Generator, Decl(lib.es2015.generator.d.ts, --, --), Decl(lib.esnext.iterator.d.ts, --, --))
+>Generator : Symbol(Generator, Decl(lib.es2015.generator.d.ts, --, --))
 
     yield; // error
     yield "a"; // error
@@ -15,7 +15,7 @@ function* g1(): Generator<number, boolean, string> {
 
 function* g2(): Generator<number, boolean, string> {
 >g2 : Symbol(g2, Decl(generatorExplicitReturnType.ts, 5, 1))
->Generator : Symbol(Generator, Decl(lib.es2015.generator.d.ts, --, --), Decl(lib.esnext.iterator.d.ts, --, --))
+>Generator : Symbol(Generator, Decl(lib.es2015.generator.d.ts, --, --))
 
     const x = yield 1;
 >x : Symbol(x, Decl(generatorExplicitReturnType.ts, 8, 9))
@@ -25,11 +25,11 @@ function* g2(): Generator<number, boolean, string> {
 
 declare const generator: Generator<number, symbol, string>;
 >generator : Symbol(generator, Decl(generatorExplicitReturnType.ts, 12, 13))
->Generator : Symbol(Generator, Decl(lib.es2015.generator.d.ts, --, --), Decl(lib.esnext.iterator.d.ts, --, --))
+>Generator : Symbol(Generator, Decl(lib.es2015.generator.d.ts, --, --))
 
 function* g3(): Generator<number, boolean, string> {
 >g3 : Symbol(g3, Decl(generatorExplicitReturnType.ts, 12, 59))
->Generator : Symbol(Generator, Decl(lib.es2015.generator.d.ts, --, --), Decl(lib.esnext.iterator.d.ts, --, --))
+>Generator : Symbol(Generator, Decl(lib.es2015.generator.d.ts, --, --))
 
     const x: number = yield* generator; // error
 >x : Symbol(x, Decl(generatorExplicitReturnType.ts, 15, 9))
@@ -40,7 +40,7 @@ function* g3(): Generator<number, boolean, string> {
 
 function* g4(): Generator<number, boolean, string> {
 >g4 : Symbol(g4, Decl(generatorExplicitReturnType.ts, 17, 1))
->Generator : Symbol(Generator, Decl(lib.es2015.generator.d.ts, --, --), Decl(lib.esnext.iterator.d.ts, --, --))
+>Generator : Symbol(Generator, Decl(lib.es2015.generator.d.ts, --, --))
 
     const x = yield* generator;
 >x : Symbol(x, Decl(generatorExplicitReturnType.ts, 20, 9))
diff --git a/tests/baselines/reference/generatorReturnContextualType.symbols b/tests/baselines/reference/generatorReturnContextualType.symbols
index 1e410d873a32b..276b6fd013a71 100644
--- a/tests/baselines/reference/generatorReturnContextualType.symbols
+++ b/tests/baselines/reference/generatorReturnContextualType.symbols
@@ -5,7 +5,7 @@
 
 function* f1(): Generator<any, { x: 'x' }, any> {
 >f1 : Symbol(f1, Decl(generatorReturnContextualType.ts, 0, 0))
->Generator : Symbol(Generator, Decl(lib.es2015.generator.d.ts, --, --), Decl(lib.esnext.iterator.d.ts, --, --))
+>Generator : Symbol(Generator, Decl(lib.es2015.generator.d.ts, --, --))
 >x : Symbol(x, Decl(generatorReturnContextualType.ts, 2, 32))
 
   return { x: 'x' };
@@ -14,7 +14,7 @@ function* f1(): Generator<any, { x: 'x' }, any> {
 
 function* g1(): Iterator<any, { x: 'x' }, any> {
 >g1 : Symbol(g1, Decl(generatorReturnContextualType.ts, 4, 1))
->Iterator : Symbol(Iterator, Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.esnext.iterator.d.ts, --, --))
+>Iterator : Symbol(Iterator, Decl(lib.es2015.iterable.d.ts, --, --))
 >x : Symbol(x, Decl(generatorReturnContextualType.ts, 6, 31))
 
   return { x: 'x' };
diff --git a/tests/baselines/reference/generatorReturnExpressionIsChecked.symbols b/tests/baselines/reference/generatorReturnExpressionIsChecked.symbols
index 976b4c3114ded..6366a75725618 100644
--- a/tests/baselines/reference/generatorReturnExpressionIsChecked.symbols
+++ b/tests/baselines/reference/generatorReturnExpressionIsChecked.symbols
@@ -3,7 +3,7 @@
 === generatorReturnExpressionIsChecked.ts ===
 function* f(): Iterator<number> {
 >f : Symbol(f, Decl(generatorReturnExpressionIsChecked.ts, 0, 0))
->Iterator : Symbol(Iterator, Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.esnext.iterator.d.ts, --, --))
+>Iterator : Symbol(Iterator, Decl(lib.es2015.iterable.d.ts, --, --))
 
     return invalid;
 }
diff --git a/tests/baselines/reference/generatorReturnTypeIndirectReferenceToGlobalType.symbols b/tests/baselines/reference/generatorReturnTypeIndirectReferenceToGlobalType.symbols
index a4fae06f89977..555b7048d4104 100644
--- a/tests/baselines/reference/generatorReturnTypeIndirectReferenceToGlobalType.symbols
+++ b/tests/baselines/reference/generatorReturnTypeIndirectReferenceToGlobalType.symbols
@@ -3,7 +3,7 @@
 === generatorReturnTypeIndirectReferenceToGlobalType.ts ===
 interface I1 extends Iterator<0, 1, 2> {}
 >I1 : Symbol(I1, Decl(generatorReturnTypeIndirectReferenceToGlobalType.ts, 0, 0))
->Iterator : Symbol(Iterator, Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.esnext.iterator.d.ts, --, --))
+>Iterator : Symbol(Iterator, Decl(lib.es2015.iterable.d.ts, --, --))
 
 function* f1(): I1 {
 >f1 : Symbol(f1, Decl(generatorReturnTypeIndirectReferenceToGlobalType.ts, 0, 41))
diff --git a/tests/baselines/reference/generatorReturnTypeInference.symbols b/tests/baselines/reference/generatorReturnTypeInference.symbols
index c15a248dfaaf7..3e1de94f089af 100644
--- a/tests/baselines/reference/generatorReturnTypeInference.symbols
+++ b/tests/baselines/reference/generatorReturnTypeInference.symbols
@@ -7,7 +7,7 @@ declare const iterableIterator: IterableIterator<number>;
 
 declare const generator: Generator<number, string, boolean>;
 >generator : Symbol(generator, Decl(generatorReturnTypeInference.ts, 1, 13))
->Generator : Symbol(Generator, Decl(lib.es2015.generator.d.ts, --, --), Decl(lib.esnext.iterator.d.ts, --, --))
+>Generator : Symbol(Generator, Decl(lib.es2015.generator.d.ts, --, --))
 
 declare const never: never;
 >never : Symbol(never, Decl(generatorReturnTypeInference.ts, 2, 13))
diff --git a/tests/baselines/reference/generatorReturnTypeInferenceNonStrict.symbols b/tests/baselines/reference/generatorReturnTypeInferenceNonStrict.symbols
index 92808d7bce940..321aad62001a3 100644
--- a/tests/baselines/reference/generatorReturnTypeInferenceNonStrict.symbols
+++ b/tests/baselines/reference/generatorReturnTypeInferenceNonStrict.symbols
@@ -7,7 +7,7 @@ declare const iterableIterator: IterableIterator<number>;
 
 declare const generator: Generator<number, string, boolean>;
 >generator : Symbol(generator, Decl(generatorReturnTypeInferenceNonStrict.ts, 1, 13))
->Generator : Symbol(Generator, Decl(lib.es2015.generator.d.ts, --, --), Decl(lib.esnext.iterator.d.ts, --, --))
+>Generator : Symbol(Generator, Decl(lib.es2015.generator.d.ts, --, --))
 
 declare const never: never;
 >never : Symbol(never, Decl(generatorReturnTypeInferenceNonStrict.ts, 2, 13))
diff --git a/tests/baselines/reference/generatorYieldContextualType.symbols b/tests/baselines/reference/generatorYieldContextualType.symbols
index 0c84ed7ec3458..364a96d995e29 100644
--- a/tests/baselines/reference/generatorYieldContextualType.symbols
+++ b/tests/baselines/reference/generatorYieldContextualType.symbols
@@ -7,7 +7,7 @@ declare function f1<T, R, S>(gen: () => Generator<R, T, S>): void;
 >R : Symbol(R, Decl(generatorYieldContextualType.ts, 0, 22))
 >S : Symbol(S, Decl(generatorYieldContextualType.ts, 0, 25))
 >gen : Symbol(gen, Decl(generatorYieldContextualType.ts, 0, 29))
->Generator : Symbol(Generator, Decl(lib.es2015.generator.d.ts, --, --), Decl(lib.esnext.iterator.d.ts, --, --))
+>Generator : Symbol(Generator, Decl(lib.es2015.generator.d.ts, --, --))
 >R : Symbol(R, Decl(generatorYieldContextualType.ts, 0, 22))
 >T : Symbol(T, Decl(generatorYieldContextualType.ts, 0, 20))
 >S : Symbol(S, Decl(generatorYieldContextualType.ts, 0, 25))
@@ -27,7 +27,7 @@ declare function f2<T, R, S>(gen: () => Generator<R, T, S> | AsyncGenerator<R, T
 >R : Symbol(R, Decl(generatorYieldContextualType.ts, 6, 22))
 >S : Symbol(S, Decl(generatorYieldContextualType.ts, 6, 25))
 >gen : Symbol(gen, Decl(generatorYieldContextualType.ts, 6, 29))
->Generator : Symbol(Generator, Decl(lib.es2015.generator.d.ts, --, --), Decl(lib.esnext.iterator.d.ts, --, --))
+>Generator : Symbol(Generator, Decl(lib.es2015.generator.d.ts, --, --))
 >R : Symbol(R, Decl(generatorYieldContextualType.ts, 6, 22))
 >T : Symbol(T, Decl(generatorYieldContextualType.ts, 6, 20))
 >S : Symbol(S, Decl(generatorYieldContextualType.ts, 6, 25))
@@ -130,7 +130,7 @@ type StepGenerator =
 >StepGenerator : Symbol(StepGenerator, Decl(generatorYieldContextualType.ts, 43, 1))
 
   | Generator<
->Generator : Symbol(Generator, Decl(lib.es2015.generator.d.ts, --, --), Decl(lib.esnext.iterator.d.ts, --, --))
+>Generator : Symbol(Generator, Decl(lib.es2015.generator.d.ts, --, --))
 
       QuickPickStep | QuickInputStep,
 >QuickPickStep : Symbol(QuickPickStep, Decl(generatorYieldContextualType.ts, 38, 1))
@@ -190,7 +190,7 @@ type StepResultGenerator<T> =
 >T : Symbol(T, Decl(generatorYieldContextualType.ts, 66, 25))
 
   | Generator<QuickPickStep | QuickInputStep, StepResult<T>, any | undefined>
->Generator : Symbol(Generator, Decl(lib.es2015.generator.d.ts, --, --), Decl(lib.esnext.iterator.d.ts, --, --))
+>Generator : Symbol(Generator, Decl(lib.es2015.generator.d.ts, --, --))
 >QuickPickStep : Symbol(QuickPickStep, Decl(generatorYieldContextualType.ts, 38, 1))
 >QuickInputStep : Symbol(QuickInputStep, Decl(generatorYieldContextualType.ts, 32, 1))
 >StepResult : Symbol(StepResult, Decl(generatorYieldContextualType.ts, 61, 10), Decl(generatorYieldContextualType.ts, 64, 1))
diff --git a/tests/baselines/reference/generatorYieldContextualType.types b/tests/baselines/reference/generatorYieldContextualType.types
index cc567327b95ac..1619affc92ccb 100644
--- a/tests/baselines/reference/generatorYieldContextualType.types
+++ b/tests/baselines/reference/generatorYieldContextualType.types
@@ -1,8 +1,5 @@
 //// [tests/cases/conformance/generators/generatorYieldContextualType.ts] ////
 
-=== Performance Stats ===
-Type Count: 1,000
-
 === generatorYieldContextualType.ts ===
 declare function f1<T, R, S>(gen: () => Generator<R, T, S>): void;
 >f1 : <T, R, S>(gen: () => Generator<R, T, S>) => void
diff --git a/tests/baselines/reference/importExportInternalComments.symbols b/tests/baselines/reference/importExportInternalComments.symbols
index 26933a7c13f41..6955f1e989650 100644
--- a/tests/baselines/reference/importExportInternalComments.symbols
+++ b/tests/baselines/reference/importExportInternalComments.symbols
@@ -6,7 +6,7 @@ declare module "foo";
 
 === default.ts ===
 /*1*/ export /*2*/ default /*3*/ Array /*4*/;
->Array : Symbol(Array, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.symbol.wellknown.d.ts, --, --) ... and 5 more)
+>Array : Symbol(Array, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.symbol.wellknown.d.ts, --, --) ... and 4 more)
 
 === index.ts ===
 /*1*/ import /*2*/ D /*3*/, /*4*/ { /*5*/ A /*6*/, /*7*/ B /*8*/ as /*9*/ C /*10*/ } /*11*/ from /*12*/ "foo";
diff --git a/tests/baselines/reference/keyofAndIndexedAccess2.symbols b/tests/baselines/reference/keyofAndIndexedAccess2.symbols
index 852c238e38506..8edacc205b583 100644
--- a/tests/baselines/reference/keyofAndIndexedAccess2.symbols
+++ b/tests/baselines/reference/keyofAndIndexedAccess2.symbols
@@ -446,9 +446,9 @@ function fn<T extends {elements: Array<string>} | {elements: Array<number>}>(par
 >fn : Symbol(fn, Decl(keyofAndIndexedAccess2.ts, 115, 69))
 >T : Symbol(T, Decl(keyofAndIndexedAccess2.ts, 119, 12))
 >elements : Symbol(elements, Decl(keyofAndIndexedAccess2.ts, 119, 23))
->Array : Symbol(Array, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.symbol.wellknown.d.ts, --, --) ... and 5 more)
+>Array : Symbol(Array, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.symbol.wellknown.d.ts, --, --) ... and 4 more)
 >elements : Symbol(elements, Decl(keyofAndIndexedAccess2.ts, 119, 51))
->Array : Symbol(Array, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.symbol.wellknown.d.ts, --, --) ... and 5 more)
+>Array : Symbol(Array, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.symbol.wellknown.d.ts, --, --) ... and 4 more)
 >param : Symbol(param, Decl(keyofAndIndexedAccess2.ts, 119, 77))
 >T : Symbol(T, Decl(keyofAndIndexedAccess2.ts, 119, 12))
 >cb : Symbol(cb, Decl(keyofAndIndexedAccess2.ts, 119, 86))
@@ -465,7 +465,7 @@ function fn<T extends {elements: Array<string>} | {elements: Array<number>}>(par
 function fn2<T extends Array<string>>(param: T, cb: (element: T[number]) => void) {
 >fn2 : Symbol(fn2, Decl(keyofAndIndexedAccess2.ts, 121, 1))
 >T : Symbol(T, Decl(keyofAndIndexedAccess2.ts, 123, 13))
->Array : Symbol(Array, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.symbol.wellknown.d.ts, --, --) ... and 5 more)
+>Array : Symbol(Array, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.symbol.wellknown.d.ts, --, --) ... and 4 more)
 >param : Symbol(param, Decl(keyofAndIndexedAccess2.ts, 123, 38))
 >T : Symbol(T, Decl(keyofAndIndexedAccess2.ts, 123, 13))
 >cb : Symbol(cb, Decl(keyofAndIndexedAccess2.ts, 123, 47))
@@ -500,7 +500,7 @@ function fn4<K extends number>() {
 
     let x: Array<string>[K] = 'abc';
 >x : Symbol(x, Decl(keyofAndIndexedAccess2.ts, 134, 7))
->Array : Symbol(Array, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.symbol.wellknown.d.ts, --, --) ... and 5 more)
+>Array : Symbol(Array, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.symbol.wellknown.d.ts, --, --) ... and 4 more)
 >K : Symbol(K, Decl(keyofAndIndexedAccess2.ts, 133, 13))
 
     let y: ReadonlyArray<string>[K] = 'abc';
diff --git a/tests/baselines/reference/modulePreserve2.trace.json b/tests/baselines/reference/modulePreserve2.trace.json
index 61b13a4e9d212..406e188dcf219 100644
--- a/tests/baselines/reference/modulePreserve2.trace.json
+++ b/tests/baselines/reference/modulePreserve2.trace.json
@@ -1019,20 +1019,6 @@
     "======== Module name '@typescript/lib-esnext/regexp' was not resolved. ========",
     "File '/.ts/package.json' does not exist according to earlier cached lookups.",
     "File '/package.json' does not exist according to earlier cached lookups.",
-    "======== Resolving module '@typescript/lib-esnext/iterator' from '/.src/__lib_node_modules_lookup_lib.esnext.iterator.d.ts__.ts'. ========",
-    "Explicitly specified module resolution kind: 'Node10'.",
-    "Loading module '@typescript/lib-esnext/iterator' from 'node_modules' folder, target file types: TypeScript, Declaration.",
-    "Searching all ancestor node_modules directories for preferred extensions: TypeScript, Declaration.",
-    "Directory '/.src/node_modules' does not exist, skipping all lookups in it.",
-    "Scoped package detected, looking in 'typescript__lib-esnext/iterator'",
-    "Directory '/node_modules/@types' does not exist, skipping all lookups in it.",
-    "Scoped package detected, looking in 'typescript__lib-esnext/iterator'",
-    "Loading module '@typescript/lib-esnext/iterator' from 'node_modules' folder, target file types: JavaScript.",
-    "Searching all ancestor node_modules directories for fallback extensions: JavaScript.",
-    "Directory '/.src/node_modules' does not exist, skipping all lookups in it.",
-    "======== Module name '@typescript/lib-esnext/iterator' was not resolved. ========",
-    "File '/.ts/package.json' does not exist according to earlier cached lookups.",
-    "File '/package.json' does not exist according to earlier cached lookups.",
     "======== Resolving module '@typescript/lib-dom' from '/.src/__lib_node_modules_lookup_lib.dom.d.ts__.ts'. ========",
     "Explicitly specified module resolution kind: 'Node10'.",
     "Loading module '@typescript/lib-dom' from 'node_modules' folder, target file types: TypeScript, Declaration.",
diff --git a/tests/baselines/reference/modulePreserve3.trace.json b/tests/baselines/reference/modulePreserve3.trace.json
index 3bfbc02675d4c..26a3f3176c907 100644
--- a/tests/baselines/reference/modulePreserve3.trace.json
+++ b/tests/baselines/reference/modulePreserve3.trace.json
@@ -951,19 +951,6 @@
     "======== Module name '@typescript/lib-esnext/regexp' was not resolved. ========",
     "File '/.ts/package.json' does not exist according to earlier cached lookups.",
     "File '/package.json' does not exist according to earlier cached lookups.",
-    "======== Resolving module '@typescript/lib-esnext/iterator' from '/.src/__lib_node_modules_lookup_lib.esnext.iterator.d.ts__.ts'. ========",
-    "Explicitly specified module resolution kind: 'Node10'.",
-    "Loading module '@typescript/lib-esnext/iterator' from 'node_modules' folder, target file types: TypeScript, Declaration.",
-    "Searching all ancestor node_modules directories for preferred extensions: TypeScript, Declaration.",
-    "Directory '/.src/node_modules' does not exist, skipping all lookups in it.",
-    "Scoped package detected, looking in 'typescript__lib-esnext/iterator'",
-    "Scoped package detected, looking in 'typescript__lib-esnext/iterator'",
-    "Loading module '@typescript/lib-esnext/iterator' from 'node_modules' folder, target file types: JavaScript.",
-    "Searching all ancestor node_modules directories for fallback extensions: JavaScript.",
-    "Directory '/.src/node_modules' does not exist, skipping all lookups in it.",
-    "======== Module name '@typescript/lib-esnext/iterator' was not resolved. ========",
-    "File '/.ts/package.json' does not exist according to earlier cached lookups.",
-    "File '/package.json' does not exist according to earlier cached lookups.",
     "======== Resolving module '@typescript/lib-dom' from '/.src/__lib_node_modules_lookup_lib.dom.d.ts__.ts'. ========",
     "Explicitly specified module resolution kind: 'Node10'.",
     "Loading module '@typescript/lib-dom' from 'node_modules' folder, target file types: TypeScript, Declaration.",
diff --git a/tests/baselines/reference/narrowingPastLastAssignment.symbols b/tests/baselines/reference/narrowingPastLastAssignment.symbols
index 810ec8984188f..4ace603d16418 100644
--- a/tests/baselines/reference/narrowingPastLastAssignment.symbols
+++ b/tests/baselines/reference/narrowingPastLastAssignment.symbols
@@ -334,7 +334,7 @@ function f12() {
     const fooMap: Map<string,Array<number>> = new Map()
 >fooMap : Symbol(fooMap, Decl(narrowingPastLastAssignment.ts, 145, 9))
 >Map : Symbol(Map, Decl(lib.es2015.collection.d.ts, --, --), Decl(lib.es2015.collection.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.symbol.wellknown.d.ts, --, --))
->Array : Symbol(Array, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.symbol.wellknown.d.ts, --, --) ... and 5 more)
+>Array : Symbol(Array, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.symbol.wellknown.d.ts, --, --) ... and 4 more)
 >Map : Symbol(Map, Decl(lib.es2015.collection.d.ts, --, --), Decl(lib.es2015.collection.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.symbol.wellknown.d.ts, --, --))
 
     const values = [1, 2, 3, 4, 5];
diff --git a/tests/baselines/reference/nativeIterator.js b/tests/baselines/reference/nativeIterator.js
deleted file mode 100644
index 42506545681dc..0000000000000
--- a/tests/baselines/reference/nativeIterator.js
+++ /dev/null
@@ -1,54 +0,0 @@
-//// [tests/cases/compiler/nativeIterator.ts] ////
-
-//// [nativeIterator.ts]
-const iterator = Iterator.from([0, 1, 2]);
-
-const mapped = iterator.map(String);
-
-const filtered = iterator.filter(x => x > 0);
-
-function isZero(x: number): x is 0 {
-  return x === 0;
-}
-const zero = iterator.filter(isZero);
-
-const iteratorFromBare = Iterator.from({
-  next() {
-    return {
-      done: Math.random() < .5,
-      value: "a string",
-    };
-  },
-});
-
-
-function* gen() {
-  yield 0;
-}
-
-const mappedGen = gen().map(x => x === 0 ? "zero" : "other");
-
-const mappedValues = [0, 1, 2].values().map(x => x === 0 ? "zero" : "other");
-
-
-//// [nativeIterator.js]
-const iterator = Iterator.from([0, 1, 2]);
-const mapped = iterator.map(String);
-const filtered = iterator.filter(x => x > 0);
-function isZero(x) {
-    return x === 0;
-}
-const zero = iterator.filter(isZero);
-const iteratorFromBare = Iterator.from({
-    next() {
-        return {
-            done: Math.random() < .5,
-            value: "a string",
-        };
-    },
-});
-function* gen() {
-    yield 0;
-}
-const mappedGen = gen().map(x => x === 0 ? "zero" : "other");
-const mappedValues = [0, 1, 2].values().map(x => x === 0 ? "zero" : "other");
diff --git a/tests/baselines/reference/nativeIterator.symbols b/tests/baselines/reference/nativeIterator.symbols
deleted file mode 100644
index 7574ee376ddbd..0000000000000
--- a/tests/baselines/reference/nativeIterator.symbols
+++ /dev/null
@@ -1,86 +0,0 @@
-//// [tests/cases/compiler/nativeIterator.ts] ////
-
-=== nativeIterator.ts ===
-const iterator = Iterator.from([0, 1, 2]);
->iterator : Symbol(iterator, Decl(nativeIterator.ts, 0, 5))
->Iterator.from : Symbol(IteratorConstructor.from, Decl(lib.esnext.iterator.d.ts, --, --))
->Iterator : Symbol(Iterator, Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.esnext.iterator.d.ts, --, --))
->from : Symbol(IteratorConstructor.from, Decl(lib.esnext.iterator.d.ts, --, --))
-
-const mapped = iterator.map(String);
->mapped : Symbol(mapped, Decl(nativeIterator.ts, 2, 5))
->iterator.map : Symbol(NativeIterator.map, Decl(lib.esnext.iterator.d.ts, --, --))
->iterator : Symbol(iterator, Decl(nativeIterator.ts, 0, 5))
->map : Symbol(NativeIterator.map, Decl(lib.esnext.iterator.d.ts, --, --))
->String : Symbol(String, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --) ... and 6 more)
-
-const filtered = iterator.filter(x => x > 0);
->filtered : Symbol(filtered, Decl(nativeIterator.ts, 4, 5))
->iterator.filter : Symbol(NativeIterator.filter, Decl(lib.esnext.iterator.d.ts, --, --), Decl(lib.esnext.iterator.d.ts, --, --))
->iterator : Symbol(iterator, Decl(nativeIterator.ts, 0, 5))
->filter : Symbol(NativeIterator.filter, Decl(lib.esnext.iterator.d.ts, --, --), Decl(lib.esnext.iterator.d.ts, --, --))
->x : Symbol(x, Decl(nativeIterator.ts, 4, 33))
->x : Symbol(x, Decl(nativeIterator.ts, 4, 33))
-
-function isZero(x: number): x is 0 {
->isZero : Symbol(isZero, Decl(nativeIterator.ts, 4, 45))
->x : Symbol(x, Decl(nativeIterator.ts, 6, 16))
->x : Symbol(x, Decl(nativeIterator.ts, 6, 16))
-
-  return x === 0;
->x : Symbol(x, Decl(nativeIterator.ts, 6, 16))
-}
-const zero = iterator.filter(isZero);
->zero : Symbol(zero, Decl(nativeIterator.ts, 9, 5))
->iterator.filter : Symbol(NativeIterator.filter, Decl(lib.esnext.iterator.d.ts, --, --), Decl(lib.esnext.iterator.d.ts, --, --))
->iterator : Symbol(iterator, Decl(nativeIterator.ts, 0, 5))
->filter : Symbol(NativeIterator.filter, Decl(lib.esnext.iterator.d.ts, --, --), Decl(lib.esnext.iterator.d.ts, --, --))
->isZero : Symbol(isZero, Decl(nativeIterator.ts, 4, 45))
-
-const iteratorFromBare = Iterator.from({
->iteratorFromBare : Symbol(iteratorFromBare, Decl(nativeIterator.ts, 11, 5))
->Iterator.from : Symbol(IteratorConstructor.from, Decl(lib.esnext.iterator.d.ts, --, --))
->Iterator : Symbol(Iterator, Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.esnext.iterator.d.ts, --, --))
->from : Symbol(IteratorConstructor.from, Decl(lib.esnext.iterator.d.ts, --, --))
-
-  next() {
->next : Symbol(next, Decl(nativeIterator.ts, 11, 40))
-
-    return {
-      done: Math.random() < .5,
->done : Symbol(done, Decl(nativeIterator.ts, 13, 12))
->Math.random : Symbol(Math.random, Decl(lib.es5.d.ts, --, --))
->Math : Symbol(Math, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.symbol.wellknown.d.ts, --, --))
->random : Symbol(Math.random, Decl(lib.es5.d.ts, --, --))
-
-      value: "a string",
->value : Symbol(value, Decl(nativeIterator.ts, 14, 31))
-
-    };
-  },
-});
-
-
-function* gen() {
->gen : Symbol(gen, Decl(nativeIterator.ts, 18, 3))
-
-  yield 0;
-}
-
-const mappedGen = gen().map(x => x === 0 ? "zero" : "other");
->mappedGen : Symbol(mappedGen, Decl(nativeIterator.ts, 25, 5))
->gen().map : Symbol(NativeIterator.map, Decl(lib.esnext.iterator.d.ts, --, --))
->gen : Symbol(gen, Decl(nativeIterator.ts, 18, 3))
->map : Symbol(NativeIterator.map, Decl(lib.esnext.iterator.d.ts, --, --))
->x : Symbol(x, Decl(nativeIterator.ts, 25, 28))
->x : Symbol(x, Decl(nativeIterator.ts, 25, 28))
-
-const mappedValues = [0, 1, 2].values().map(x => x === 0 ? "zero" : "other");
->mappedValues : Symbol(mappedValues, Decl(nativeIterator.ts, 27, 5))
->[0, 1, 2].values().map : Symbol(NativeIterator.map, Decl(lib.esnext.iterator.d.ts, --, --))
->[0, 1, 2].values : Symbol(Array.values, Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.esnext.iterator.d.ts, --, --))
->values : Symbol(Array.values, Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.esnext.iterator.d.ts, --, --))
->map : Symbol(NativeIterator.map, Decl(lib.esnext.iterator.d.ts, --, --))
->x : Symbol(x, Decl(nativeIterator.ts, 27, 44))
->x : Symbol(x, Decl(nativeIterator.ts, 27, 44))
-
diff --git a/tests/baselines/reference/nativeIterator.types b/tests/baselines/reference/nativeIterator.types
deleted file mode 100644
index d8ed9d812754b..0000000000000
--- a/tests/baselines/reference/nativeIterator.types
+++ /dev/null
@@ -1,216 +0,0 @@
-//// [tests/cases/compiler/nativeIterator.ts] ////
-
-=== nativeIterator.ts ===
-const iterator = Iterator.from([0, 1, 2]);
->iterator : NativeIterator<number, void, undefined>
->         : ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
->Iterator.from([0, 1, 2]) : NativeIterator<number, void, undefined>
->                         : ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
->Iterator.from : <T>(value: Iterator<T> | Iterable<T>) => NativeIterator<T, void, undefined>
->              : ^ ^^     ^^                         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
->Iterator : (abstract new <T>() => NativeIterator<T, void, undefined>) & IteratorConstructor
->         : ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
->from : <T>(value: Iterator<T> | Iterable<T>) => NativeIterator<T, void, undefined>
->     : ^ ^^     ^^                         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
->[0, 1, 2] : number[]
->          : ^^^^^^^^
->0 : 0
->  : ^
->1 : 1
->  : ^
->2 : 2
->  : ^
-
-const mapped = iterator.map(String);
->mapped : NativeIterator<string, void, undefined>
->       : ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
->iterator.map(String) : NativeIterator<string, void, undefined>
->                     : ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
->iterator.map : <U>(callbackfn: (value: number, index: number) => U) => NativeIterator<U, void, undefined>
->             : ^^^^          ^^^     ^^^^^^^^^^     ^^      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
->iterator : NativeIterator<number, void, undefined>
->         : ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
->map : <U>(callbackfn: (value: number, index: number) => U) => NativeIterator<U, void, undefined>
->    : ^^^^          ^^^     ^^^^^^^^^^     ^^      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
->String : StringConstructor
->       : ^^^^^^^^^^^^^^^^^
-
-const filtered = iterator.filter(x => x > 0);
->filtered : NativeIterator<number, void, undefined>
->         : ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
->iterator.filter(x => x > 0) : NativeIterator<number, void, undefined>
->                            : ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
->iterator.filter : { <S extends number>(predicate: (value: number, index: number) => value is S): NativeIterator<S, void, undefined>; (predicate: (value: number, index: number) => unknown): NativeIterator<number, void, undefined>; }
->                : ^^^^^^^^^^^^^^^^^^^^^         ^^^     ^^^^^^^^^^     ^^      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^         ^^^     ^^^^^^^^^^     ^^      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
->iterator : NativeIterator<number, void, undefined>
->         : ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
->filter : { <S extends number>(predicate: (value: number, index: number) => value is S): NativeIterator<S, void, undefined>; (predicate: (value: number, index: number) => unknown): NativeIterator<number, void, undefined>; }
->       : ^^^^^^^^^^^^^^^^^^^^^         ^^^     ^^^^^^^^^^     ^^      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^         ^^^     ^^^^^^^^^^     ^^      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
->x => x > 0 : (x: number) => boolean
->           : ^ ^^^^^^^^^^^^^^^^^^^^
->x : number
->  : ^^^^^^
->x > 0 : boolean
->      : ^^^^^^^
->x : number
->  : ^^^^^^
->0 : 0
->  : ^
-
-function isZero(x: number): x is 0 {
->isZero : (x: number) => x is 0
->       : ^ ^^      ^^^^^      
->x : number
->  : ^^^^^^
-
-  return x === 0;
->x === 0 : boolean
->        : ^^^^^^^
->x : number
->  : ^^^^^^
->0 : 0
->  : ^
-}
-const zero = iterator.filter(isZero);
->zero : NativeIterator<0, void, undefined>
->     : ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
->iterator.filter(isZero) : NativeIterator<0, void, undefined>
->                        : ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
->iterator.filter : { <S extends number>(predicate: (value: number, index: number) => value is S): NativeIterator<S, void, undefined>; (predicate: (value: number, index: number) => unknown): NativeIterator<number, void, undefined>; }
->                : ^^^^^^^^^^^^^^^^^^^^^         ^^^     ^^^^^^^^^^     ^^      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^         ^^^     ^^^^^^^^^^     ^^      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
->iterator : NativeIterator<number, void, undefined>
->         : ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
->filter : { <S extends number>(predicate: (value: number, index: number) => value is S): NativeIterator<S, void, undefined>; (predicate: (value: number, index: number) => unknown): NativeIterator<number, void, undefined>; }
->       : ^^^^^^^^^^^^^^^^^^^^^         ^^^     ^^^^^^^^^^     ^^      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^         ^^^     ^^^^^^^^^^     ^^      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
->isZero : (x: number) => x is 0
->       : ^ ^^      ^^^^^^^^^^^
-
-const iteratorFromBare = Iterator.from({
->iteratorFromBare : NativeIterator<string, void, undefined>
->                 : ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
->Iterator.from({  next() {    return {      done: Math.random() < .5,      value: "a string",    };  },}) : NativeIterator<string, void, undefined>
->                                                                                                         : ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
->Iterator.from : <T>(value: Iterator<T> | Iterable<T>) => NativeIterator<T, void, undefined>
->              : ^ ^^     ^^                         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
->Iterator : (abstract new <T>() => NativeIterator<T, void, undefined>) & IteratorConstructor
->         : ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
->from : <T>(value: Iterator<T> | Iterable<T>) => NativeIterator<T, void, undefined>
->     : ^ ^^     ^^                         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
->{  next() {    return {      done: Math.random() < .5,      value: "a string",    };  },} : { next(): { done: boolean; value: string; }; }
->                                                                                          : ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
-
-  next() {
->next : () => { done: boolean; value: string; }
->     : ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
-
-    return {
->{      done: Math.random() < .5,      value: "a string",    } : { done: boolean; value: string; }
->                                                              : ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
-
-      done: Math.random() < .5,
->done : boolean
->     : ^^^^^^^
->Math.random() < .5 : boolean
->                   : ^^^^^^^
->Math.random() : number
->              : ^^^^^^
->Math.random : () => number
->            : ^^^^^^^^^^^^
->Math : Math
->     : ^^^^
->random : () => number
->       : ^^^^^^^^^^^^
->.5 : 0.5
->   : ^^^
-
-      value: "a string",
->value : string
->      : ^^^^^^
->"a string" : "a string"
->           : ^^^^^^^^^^
-
-    };
-  },
-});
-
-
-function* gen() {
->gen : () => Generator<number, void, unknown>
->    : ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
-
-  yield 0;
->yield 0 : any
->0 : 0
->  : ^
-}
-
-const mappedGen = gen().map(x => x === 0 ? "zero" : "other");
->mappedGen : NativeIterator<"zero" | "other", void, undefined>
->          : ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
->gen().map(x => x === 0 ? "zero" : "other") : NativeIterator<"zero" | "other", void, undefined>
->                                           : ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
->gen().map : <U>(callbackfn: (value: number, index: number) => U) => NativeIterator<U, void, undefined>
->          : ^^^^          ^^^     ^^^^^^^^^^     ^^      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
->gen() : Generator<number, void, unknown>
->      : ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
->gen : () => Generator<number, void, unknown>
->    : ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
->map : <U>(callbackfn: (value: number, index: number) => U) => NativeIterator<U, void, undefined>
->    : ^^^^          ^^^     ^^^^^^^^^^     ^^      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
->x => x === 0 ? "zero" : "other" : (x: number) => "zero" | "other"
->                                : ^ ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
->x : number
->  : ^^^^^^
->x === 0 ? "zero" : "other" : "zero" | "other"
->                           : ^^^^^^^^^^^^^^^^
->x === 0 : boolean
->        : ^^^^^^^
->x : number
->  : ^^^^^^
->0 : 0
->  : ^
->"zero" : "zero"
->       : ^^^^^^
->"other" : "other"
->        : ^^^^^^^
-
-const mappedValues = [0, 1, 2].values().map(x => x === 0 ? "zero" : "other");
->mappedValues : NativeIterator<"zero" | "other", void, undefined>
->             : ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
->[0, 1, 2].values().map(x => x === 0 ? "zero" : "other") : NativeIterator<"zero" | "other", void, undefined>
->                                                        : ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
->[0, 1, 2].values().map : <U>(callbackfn: (value: number, index: number) => U) => NativeIterator<U, void, undefined>
->                       : ^^^^          ^^^     ^^^^^^^^^^     ^^      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
->[0, 1, 2].values() : NativeIterator<number, void, undefined>
->                   : ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
->[0, 1, 2].values : { (): IterableIterator<number>; (): NativeIterator<number, void, undefined>; }
->                 : ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
->[0, 1, 2] : number[]
->          : ^^^^^^^^
->0 : 0
->  : ^
->1 : 1
->  : ^
->2 : 2
->  : ^
->values : { (): IterableIterator<number>; (): NativeIterator<number, void, undefined>; }
->       : ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
->map : <U>(callbackfn: (value: number, index: number) => U) => NativeIterator<U, void, undefined>
->    : ^^^^          ^^^     ^^^^^^^^^^     ^^      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
->x => x === 0 ? "zero" : "other" : (x: number) => "zero" | "other"
->                                : ^ ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
->x : number
->  : ^^^^^^
->x === 0 ? "zero" : "other" : "zero" | "other"
->                           : ^^^^^^^^^^^^^^^^
->x === 0 : boolean
->        : ^^^^^^^
->x : number
->  : ^^^^^^
->0 : 0
->  : ^
->"zero" : "zero"
->       : ^^^^^^
->"other" : "other"
->        : ^^^^^^^
-
diff --git a/tests/baselines/reference/noIterationTypeErrorsInCFA.symbols b/tests/baselines/reference/noIterationTypeErrorsInCFA.symbols
index 413b8f145d85e..211e351019cc1 100644
--- a/tests/baselines/reference/noIterationTypeErrorsInCFA.symbols
+++ b/tests/baselines/reference/noIterationTypeErrorsInCFA.symbols
@@ -15,7 +15,7 @@ export function doRemove(dds: F | F[]) {
 
     if (!Array.isArray(dds)) {
 >Array.isArray : Symbol(ArrayConstructor.isArray, Decl(lib.es5.d.ts, --, --))
->Array : Symbol(Array, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.symbol.wellknown.d.ts, --, --) ... and 5 more)
+>Array : Symbol(Array, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.symbol.wellknown.d.ts, --, --) ... and 4 more)
 >isArray : Symbol(ArrayConstructor.isArray, Decl(lib.es5.d.ts, --, --))
 >dds : Symbol(dds, Decl(noIterationTypeErrorsInCFA.ts, 3, 25))
 
diff --git a/tests/baselines/reference/nodeModulesExportsBlocksTypesVersions(module=nodenext).trace.json b/tests/baselines/reference/nodeModulesExportsBlocksTypesVersions(module=nodenext).trace.json
index 6ce9644bf9c65..6bd7d40222f9b 100644
--- a/tests/baselines/reference/nodeModulesExportsBlocksTypesVersions(module=nodenext).trace.json
+++ b/tests/baselines/reference/nodeModulesExportsBlocksTypesVersions(module=nodenext).trace.json
@@ -1189,20 +1189,6 @@
     "======== Module name '@typescript/lib-esnext/regexp' was not resolved. ========",
     "File '/.ts/package.json' does not exist according to earlier cached lookups.",
     "File '/package.json' does not exist according to earlier cached lookups.",
-    "======== Resolving module '@typescript/lib-esnext/iterator' from '/.src/__lib_node_modules_lookup_lib.esnext.iterator.d.ts__.ts'. ========",
-    "Explicitly specified module resolution kind: 'Node10'.",
-    "Loading module '@typescript/lib-esnext/iterator' from 'node_modules' folder, target file types: TypeScript, Declaration.",
-    "Searching all ancestor node_modules directories for preferred extensions: TypeScript, Declaration.",
-    "Directory '/.src/node_modules' does not exist, skipping all lookups in it.",
-    "Scoped package detected, looking in 'typescript__lib-esnext/iterator'",
-    "Directory '/node_modules/@types' does not exist, skipping all lookups in it.",
-    "Scoped package detected, looking in 'typescript__lib-esnext/iterator'",
-    "Loading module '@typescript/lib-esnext/iterator' from 'node_modules' folder, target file types: JavaScript.",
-    "Searching all ancestor node_modules directories for fallback extensions: JavaScript.",
-    "Directory '/.src/node_modules' does not exist, skipping all lookups in it.",
-    "======== Module name '@typescript/lib-esnext/iterator' was not resolved. ========",
-    "File '/.ts/package.json' does not exist according to earlier cached lookups.",
-    "File '/package.json' does not exist according to earlier cached lookups.",
     "======== Resolving module '@typescript/lib-dom' from '/.src/__lib_node_modules_lookup_lib.dom.d.ts__.ts'. ========",
     "Explicitly specified module resolution kind: 'Node10'.",
     "Loading module '@typescript/lib-dom' from 'node_modules' folder, target file types: TypeScript, Declaration.",
diff --git a/tests/baselines/reference/nodeModulesPackageImports(module=nodenext).trace.json b/tests/baselines/reference/nodeModulesPackageImports(module=nodenext).trace.json
index 84552c9fbe071..0faf9ac8e2d24 100644
--- a/tests/baselines/reference/nodeModulesPackageImports(module=nodenext).trace.json
+++ b/tests/baselines/reference/nodeModulesPackageImports(module=nodenext).trace.json
@@ -1133,21 +1133,6 @@
     "======== Module name '@typescript/lib-esnext/regexp' was not resolved. ========",
     "File '/.ts/package.json' does not exist according to earlier cached lookups.",
     "File '/package.json' does not exist according to earlier cached lookups.",
-    "======== Resolving module '@typescript/lib-esnext/iterator' from '/.src/__lib_node_modules_lookup_lib.esnext.iterator.d.ts__.ts'. ========",
-    "Explicitly specified module resolution kind: 'Node10'.",
-    "Loading module '@typescript/lib-esnext/iterator' from 'node_modules' folder, target file types: TypeScript, Declaration.",
-    "Searching all ancestor node_modules directories for preferred extensions: TypeScript, Declaration.",
-    "Directory '/.src/node_modules' does not exist, skipping all lookups in it.",
-    "Scoped package detected, looking in 'typescript__lib-esnext/iterator'",
-    "Directory '/node_modules' does not exist, skipping all lookups in it.",
-    "Scoped package detected, looking in 'typescript__lib-esnext/iterator'",
-    "Loading module '@typescript/lib-esnext/iterator' from 'node_modules' folder, target file types: JavaScript.",
-    "Searching all ancestor node_modules directories for fallback extensions: JavaScript.",
-    "Directory '/.src/node_modules' does not exist, skipping all lookups in it.",
-    "Directory '/node_modules' does not exist, skipping all lookups in it.",
-    "======== Module name '@typescript/lib-esnext/iterator' was not resolved. ========",
-    "File '/.ts/package.json' does not exist according to earlier cached lookups.",
-    "File '/package.json' does not exist according to earlier cached lookups.",
     "======== Resolving module '@typescript/lib-dom' from '/.src/__lib_node_modules_lookup_lib.dom.d.ts__.ts'. ========",
     "Explicitly specified module resolution kind: 'Node10'.",
     "Loading module '@typescript/lib-dom' from 'node_modules' folder, target file types: TypeScript, Declaration.",
diff --git a/tests/baselines/reference/nodeModulesPackagePatternExportsTrailers(module=nodenext).trace.json b/tests/baselines/reference/nodeModulesPackagePatternExportsTrailers(module=nodenext).trace.json
index 1d857712fbca0..0ef4d5da75fb7 100644
--- a/tests/baselines/reference/nodeModulesPackagePatternExportsTrailers(module=nodenext).trace.json
+++ b/tests/baselines/reference/nodeModulesPackagePatternExportsTrailers(module=nodenext).trace.json
@@ -1170,20 +1170,6 @@
     "======== Module name '@typescript/lib-esnext/regexp' was not resolved. ========",
     "File '/.ts/package.json' does not exist according to earlier cached lookups.",
     "File '/package.json' does not exist according to earlier cached lookups.",
-    "======== Resolving module '@typescript/lib-esnext/iterator' from '/.src/__lib_node_modules_lookup_lib.esnext.iterator.d.ts__.ts'. ========",
-    "Explicitly specified module resolution kind: 'Node10'.",
-    "Loading module '@typescript/lib-esnext/iterator' from 'node_modules' folder, target file types: TypeScript, Declaration.",
-    "Searching all ancestor node_modules directories for preferred extensions: TypeScript, Declaration.",
-    "Directory '/.src/node_modules/@types' does not exist, skipping all lookups in it.",
-    "Scoped package detected, looking in 'typescript__lib-esnext/iterator'",
-    "Directory '/node_modules' does not exist, skipping all lookups in it.",
-    "Scoped package detected, looking in 'typescript__lib-esnext/iterator'",
-    "Loading module '@typescript/lib-esnext/iterator' from 'node_modules' folder, target file types: JavaScript.",
-    "Searching all ancestor node_modules directories for fallback extensions: JavaScript.",
-    "Directory '/node_modules' does not exist, skipping all lookups in it.",
-    "======== Module name '@typescript/lib-esnext/iterator' was not resolved. ========",
-    "File '/.ts/package.json' does not exist according to earlier cached lookups.",
-    "File '/package.json' does not exist according to earlier cached lookups.",
     "======== Resolving module '@typescript/lib-dom' from '/.src/__lib_node_modules_lookup_lib.dom.d.ts__.ts'. ========",
     "Explicitly specified module resolution kind: 'Node10'.",
     "Loading module '@typescript/lib-dom' from 'node_modules' folder, target file types: TypeScript, Declaration.",
diff --git a/tests/baselines/reference/reactJsxReactResolvedNodeNext.trace.json b/tests/baselines/reference/reactJsxReactResolvedNodeNext.trace.json
index 793a061fb3bbd..d19286646e834 100644
--- a/tests/baselines/reference/reactJsxReactResolvedNodeNext.trace.json
+++ b/tests/baselines/reference/reactJsxReactResolvedNodeNext.trace.json
@@ -964,19 +964,6 @@
     "======== Module name '@typescript/lib-esnext/regexp' was not resolved. ========",
     "File '/.ts/package.json' does not exist according to earlier cached lookups.",
     "File '/package.json' does not exist according to earlier cached lookups.",
-    "======== Resolving module '@typescript/lib-esnext/iterator' from '/.src/__lib_node_modules_lookup_lib.esnext.iterator.d.ts__.ts'. ========",
-    "Explicitly specified module resolution kind: 'Node10'.",
-    "Loading module '@typescript/lib-esnext/iterator' from 'node_modules' folder, target file types: TypeScript, Declaration.",
-    "Searching all ancestor node_modules directories for preferred extensions: TypeScript, Declaration.",
-    "Scoped package detected, looking in 'typescript__lib-esnext/iterator'",
-    "Directory '/node_modules' does not exist, skipping all lookups in it.",
-    "Scoped package detected, looking in 'typescript__lib-esnext/iterator'",
-    "Loading module '@typescript/lib-esnext/iterator' from 'node_modules' folder, target file types: JavaScript.",
-    "Searching all ancestor node_modules directories for fallback extensions: JavaScript.",
-    "Directory '/node_modules' does not exist, skipping all lookups in it.",
-    "======== Module name '@typescript/lib-esnext/iterator' was not resolved. ========",
-    "File '/.ts/package.json' does not exist according to earlier cached lookups.",
-    "File '/package.json' does not exist according to earlier cached lookups.",
     "======== Resolving module '@typescript/lib-dom' from '/.src/__lib_node_modules_lookup_lib.dom.d.ts__.ts'. ========",
     "Explicitly specified module resolution kind: 'Node10'.",
     "Loading module '@typescript/lib-dom' from 'node_modules' folder, target file types: TypeScript, Declaration.",
diff --git a/tests/baselines/reference/reactJsxReactResolvedNodeNextEsm.trace.json b/tests/baselines/reference/reactJsxReactResolvedNodeNextEsm.trace.json
index fd26708d87106..1849087a77565 100644
--- a/tests/baselines/reference/reactJsxReactResolvedNodeNextEsm.trace.json
+++ b/tests/baselines/reference/reactJsxReactResolvedNodeNextEsm.trace.json
@@ -964,19 +964,6 @@
     "======== Module name '@typescript/lib-esnext/regexp' was not resolved. ========",
     "File '/.ts/package.json' does not exist according to earlier cached lookups.",
     "File '/package.json' does not exist according to earlier cached lookups.",
-    "======== Resolving module '@typescript/lib-esnext/iterator' from '/.src/__lib_node_modules_lookup_lib.esnext.iterator.d.ts__.ts'. ========",
-    "Explicitly specified module resolution kind: 'Node10'.",
-    "Loading module '@typescript/lib-esnext/iterator' from 'node_modules' folder, target file types: TypeScript, Declaration.",
-    "Searching all ancestor node_modules directories for preferred extensions: TypeScript, Declaration.",
-    "Scoped package detected, looking in 'typescript__lib-esnext/iterator'",
-    "Directory '/node_modules' does not exist, skipping all lookups in it.",
-    "Scoped package detected, looking in 'typescript__lib-esnext/iterator'",
-    "Loading module '@typescript/lib-esnext/iterator' from 'node_modules' folder, target file types: JavaScript.",
-    "Searching all ancestor node_modules directories for fallback extensions: JavaScript.",
-    "Directory '/node_modules' does not exist, skipping all lookups in it.",
-    "======== Module name '@typescript/lib-esnext/iterator' was not resolved. ========",
-    "File '/.ts/package.json' does not exist according to earlier cached lookups.",
-    "File '/package.json' does not exist according to earlier cached lookups.",
     "======== Resolving module '@typescript/lib-dom' from '/.src/__lib_node_modules_lookup_lib.dom.d.ts__.ts'. ========",
     "Explicitly specified module resolution kind: 'Node10'.",
     "Loading module '@typescript/lib-dom' from 'node_modules' folder, target file types: TypeScript, Declaration.",
diff --git a/tests/baselines/reference/recursiveConditionalTypes.symbols b/tests/baselines/reference/recursiveConditionalTypes.symbols
index eb5f13075710f..8bf1bf55f2154 100644
--- a/tests/baselines/reference/recursiveConditionalTypes.symbols
+++ b/tests/baselines/reference/recursiveConditionalTypes.symbols
@@ -568,7 +568,7 @@ let five: Add<2, 3>;
 type _PrependNextNum<A extends Array<unknown>> = A['length'] extends infer T
 >_PrependNextNum : Symbol(_PrependNextNum, Decl(recursiveConditionalTypes.ts, 147, 20))
 >A : Symbol(A, Decl(recursiveConditionalTypes.ts, 151, 21))
->Array : Symbol(Array, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.symbol.wellknown.d.ts, --, --) ... and 5 more)
+>Array : Symbol(Array, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.symbol.wellknown.d.ts, --, --) ... and 4 more)
 >A : Symbol(A, Decl(recursiveConditionalTypes.ts, 151, 21))
 >T : Symbol(T, Decl(recursiveConditionalTypes.ts, 151, 74))
 
@@ -586,7 +586,7 @@ type _PrependNextNum<A extends Array<unknown>> = A['length'] extends infer T
 type _Enumerate<A extends Array<unknown>, N extends number> = N extends A['length']
 >_Enumerate : Symbol(_Enumerate, Decl(recursiveConditionalTypes.ts, 155, 12))
 >A : Symbol(A, Decl(recursiveConditionalTypes.ts, 157, 16))
->Array : Symbol(Array, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.symbol.wellknown.d.ts, --, --) ... and 5 more)
+>Array : Symbol(Array, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.symbol.wellknown.d.ts, --, --) ... and 4 more)
 >N : Symbol(N, Decl(recursiveConditionalTypes.ts, 157, 41))
 >N : Symbol(N, Decl(recursiveConditionalTypes.ts, 157, 41))
 >A : Symbol(A, Decl(recursiveConditionalTypes.ts, 157, 16))
diff --git a/tests/baselines/reference/taggedTemplatesWithTypeArguments1.symbols b/tests/baselines/reference/taggedTemplatesWithTypeArguments1.symbols
index fa7f75d4a3a06..c89c6bb054768 100644
--- a/tests/baselines/reference/taggedTemplatesWithTypeArguments1.symbols
+++ b/tests/baselines/reference/taggedTemplatesWithTypeArguments1.symbols
@@ -7,7 +7,7 @@ declare function f<T>(strs: TemplateStringsArray, ...callbacks: Array<(x: T) =>
 >strs : Symbol(strs, Decl(taggedTemplatesWithTypeArguments1.ts, 0, 22))
 >TemplateStringsArray : Symbol(TemplateStringsArray, Decl(lib.es5.d.ts, --, --))
 >callbacks : Symbol(callbacks, Decl(taggedTemplatesWithTypeArguments1.ts, 0, 49))
->Array : Symbol(Array, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.symbol.wellknown.d.ts, --, --) ... and 5 more)
+>Array : Symbol(Array, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.symbol.wellknown.d.ts, --, --) ... and 4 more)
 >x : Symbol(x, Decl(taggedTemplatesWithTypeArguments1.ts, 0, 71))
 >T : Symbol(T, Decl(taggedTemplatesWithTypeArguments1.ts, 0, 19))
 
diff --git a/tests/baselines/reference/tsc/runWithoutArgs/does-not-add-color-when-NO_COLOR-is-set.js b/tests/baselines/reference/tsc/runWithoutArgs/does-not-add-color-when-NO_COLOR-is-set.js
index 8201ec9ce247e..97c9057dd03b3 100644
--- a/tests/baselines/reference/tsc/runWithoutArgs/does-not-add-color-when-NO_COLOR-is-set.js
+++ b/tests/baselines/reference/tsc/runWithoutArgs/does-not-add-color-when-NO_COLOR-is-set.js
@@ -111,7 +111,7 @@ default: undefined
 
 --lib
 Specify a set of bundled library declaration files that describe the target runtime environment.
-one or more: es5, es6/es2015, es7/es2016, es2017, es2018, es2019, es2020, es2021, es2022, es2023, esnext, dom, dom.iterable, dom.asynciterable, webworker, webworker.importscripts, webworker.iterable, webworker.asynciterable, scripthost, es2015.core, es2015.collection, es2015.generator, es2015.iterable, es2015.promise, es2015.proxy, es2015.reflect, es2015.symbol, es2015.symbol.wellknown, es2016.array.include, es2016.intl, es2017.date, es2017.object, es2017.sharedmemory, es2017.string, es2017.intl, es2017.typedarrays, es2018.asyncgenerator, es2018.asynciterable/esnext.asynciterable, es2018.intl, es2018.promise, es2018.regexp, es2019.array, es2019.object, es2019.string, es2019.symbol/esnext.symbol, es2019.intl, es2020.bigint/esnext.bigint, es2020.date, es2020.promise, es2020.sharedmemory, es2020.string, es2020.symbol.wellknown, es2020.intl, es2020.number, es2021.promise, es2021.string, es2021.weakref/esnext.weakref, es2021.intl, es2022.array, es2022.error, es2022.intl, es2022.object, es2022.sharedmemory, es2022.string/esnext.string, es2022.regexp, es2023.array, es2023.collection, es2023.intl, esnext.array, esnext.collection, esnext.intl, esnext.disposable, esnext.promise, esnext.decorators, esnext.object, esnext.regexp, esnext.iterator, decorators, decorators.legacy
+one or more: es5, es6/es2015, es7/es2016, es2017, es2018, es2019, es2020, es2021, es2022, es2023, esnext, dom, dom.iterable, dom.asynciterable, webworker, webworker.importscripts, webworker.iterable, webworker.asynciterable, scripthost, es2015.core, es2015.collection, es2015.generator, es2015.iterable, es2015.promise, es2015.proxy, es2015.reflect, es2015.symbol, es2015.symbol.wellknown, es2016.array.include, es2016.intl, es2017.date, es2017.object, es2017.sharedmemory, es2017.string, es2017.intl, es2017.typedarrays, es2018.asyncgenerator, es2018.asynciterable/esnext.asynciterable, es2018.intl, es2018.promise, es2018.regexp, es2019.array, es2019.object, es2019.string, es2019.symbol/esnext.symbol, es2019.intl, es2020.bigint/esnext.bigint, es2020.date, es2020.promise, es2020.sharedmemory, es2020.string, es2020.symbol.wellknown, es2020.intl, es2020.number, es2021.promise, es2021.string, es2021.weakref/esnext.weakref, es2021.intl, es2022.array, es2022.error, es2022.intl, es2022.object, es2022.sharedmemory, es2022.string/esnext.string, es2022.regexp, es2023.array, es2023.collection, es2023.intl, esnext.array, esnext.collection, esnext.intl, esnext.disposable, esnext.promise, esnext.decorators, esnext.object, esnext.regexp, decorators, decorators.legacy
 default: undefined
 
 --allowJs
diff --git a/tests/baselines/reference/tsc/runWithoutArgs/show-help-with-ExitStatus.DiagnosticsPresent_OutputsSkipped-when-host-can't-provide-terminal-width.js b/tests/baselines/reference/tsc/runWithoutArgs/show-help-with-ExitStatus.DiagnosticsPresent_OutputsSkipped-when-host-can't-provide-terminal-width.js
index 5da7c419d54b2..8191f56bbf51a 100644
--- a/tests/baselines/reference/tsc/runWithoutArgs/show-help-with-ExitStatus.DiagnosticsPresent_OutputsSkipped-when-host-can't-provide-terminal-width.js
+++ b/tests/baselines/reference/tsc/runWithoutArgs/show-help-with-ExitStatus.DiagnosticsPresent_OutputsSkipped-when-host-can't-provide-terminal-width.js
@@ -111,7 +111,7 @@ default: undefined
 
 --lib
 Specify a set of bundled library declaration files that describe the target runtime environment.
-one or more: es5, es6/es2015, es7/es2016, es2017, es2018, es2019, es2020, es2021, es2022, es2023, esnext, dom, dom.iterable, dom.asynciterable, webworker, webworker.importscripts, webworker.iterable, webworker.asynciterable, scripthost, es2015.core, es2015.collection, es2015.generator, es2015.iterable, es2015.promise, es2015.proxy, es2015.reflect, es2015.symbol, es2015.symbol.wellknown, es2016.array.include, es2016.intl, es2017.date, es2017.object, es2017.sharedmemory, es2017.string, es2017.intl, es2017.typedarrays, es2018.asyncgenerator, es2018.asynciterable/esnext.asynciterable, es2018.intl, es2018.promise, es2018.regexp, es2019.array, es2019.object, es2019.string, es2019.symbol/esnext.symbol, es2019.intl, es2020.bigint/esnext.bigint, es2020.date, es2020.promise, es2020.sharedmemory, es2020.string, es2020.symbol.wellknown, es2020.intl, es2020.number, es2021.promise, es2021.string, es2021.weakref/esnext.weakref, es2021.intl, es2022.array, es2022.error, es2022.intl, es2022.object, es2022.sharedmemory, es2022.string/esnext.string, es2022.regexp, es2023.array, es2023.collection, es2023.intl, esnext.array, esnext.collection, esnext.intl, esnext.disposable, esnext.promise, esnext.decorators, esnext.object, esnext.regexp, esnext.iterator, decorators, decorators.legacy
+one or more: es5, es6/es2015, es7/es2016, es2017, es2018, es2019, es2020, es2021, es2022, es2023, esnext, dom, dom.iterable, dom.asynciterable, webworker, webworker.importscripts, webworker.iterable, webworker.asynciterable, scripthost, es2015.core, es2015.collection, es2015.generator, es2015.iterable, es2015.promise, es2015.proxy, es2015.reflect, es2015.symbol, es2015.symbol.wellknown, es2016.array.include, es2016.intl, es2017.date, es2017.object, es2017.sharedmemory, es2017.string, es2017.intl, es2017.typedarrays, es2018.asyncgenerator, es2018.asynciterable/esnext.asynciterable, es2018.intl, es2018.promise, es2018.regexp, es2019.array, es2019.object, es2019.string, es2019.symbol/esnext.symbol, es2019.intl, es2020.bigint/esnext.bigint, es2020.date, es2020.promise, es2020.sharedmemory, es2020.string, es2020.symbol.wellknown, es2020.intl, es2020.number, es2021.promise, es2021.string, es2021.weakref/esnext.weakref, es2021.intl, es2022.array, es2022.error, es2022.intl, es2022.object, es2022.sharedmemory, es2022.string/esnext.string, es2022.regexp, es2023.array, es2023.collection, es2023.intl, esnext.array, esnext.collection, esnext.intl, esnext.disposable, esnext.promise, esnext.decorators, esnext.object, esnext.regexp, decorators, decorators.legacy
 default: undefined
 
 --allowJs
diff --git a/tests/baselines/reference/tsc/runWithoutArgs/show-help-with-ExitStatus.DiagnosticsPresent_OutputsSkipped.js b/tests/baselines/reference/tsc/runWithoutArgs/show-help-with-ExitStatus.DiagnosticsPresent_OutputsSkipped.js
index 5da7c419d54b2..8191f56bbf51a 100644
--- a/tests/baselines/reference/tsc/runWithoutArgs/show-help-with-ExitStatus.DiagnosticsPresent_OutputsSkipped.js
+++ b/tests/baselines/reference/tsc/runWithoutArgs/show-help-with-ExitStatus.DiagnosticsPresent_OutputsSkipped.js
@@ -111,7 +111,7 @@ default: undefined
 
 --lib
 Specify a set of bundled library declaration files that describe the target runtime environment.
-one or more: es5, es6/es2015, es7/es2016, es2017, es2018, es2019, es2020, es2021, es2022, es2023, esnext, dom, dom.iterable, dom.asynciterable, webworker, webworker.importscripts, webworker.iterable, webworker.asynciterable, scripthost, es2015.core, es2015.collection, es2015.generator, es2015.iterable, es2015.promise, es2015.proxy, es2015.reflect, es2015.symbol, es2015.symbol.wellknown, es2016.array.include, es2016.intl, es2017.date, es2017.object, es2017.sharedmemory, es2017.string, es2017.intl, es2017.typedarrays, es2018.asyncgenerator, es2018.asynciterable/esnext.asynciterable, es2018.intl, es2018.promise, es2018.regexp, es2019.array, es2019.object, es2019.string, es2019.symbol/esnext.symbol, es2019.intl, es2020.bigint/esnext.bigint, es2020.date, es2020.promise, es2020.sharedmemory, es2020.string, es2020.symbol.wellknown, es2020.intl, es2020.number, es2021.promise, es2021.string, es2021.weakref/esnext.weakref, es2021.intl, es2022.array, es2022.error, es2022.intl, es2022.object, es2022.sharedmemory, es2022.string/esnext.string, es2022.regexp, es2023.array, es2023.collection, es2023.intl, esnext.array, esnext.collection, esnext.intl, esnext.disposable, esnext.promise, esnext.decorators, esnext.object, esnext.regexp, esnext.iterator, decorators, decorators.legacy
+one or more: es5, es6/es2015, es7/es2016, es2017, es2018, es2019, es2020, es2021, es2022, es2023, esnext, dom, dom.iterable, dom.asynciterable, webworker, webworker.importscripts, webworker.iterable, webworker.asynciterable, scripthost, es2015.core, es2015.collection, es2015.generator, es2015.iterable, es2015.promise, es2015.proxy, es2015.reflect, es2015.symbol, es2015.symbol.wellknown, es2016.array.include, es2016.intl, es2017.date, es2017.object, es2017.sharedmemory, es2017.string, es2017.intl, es2017.typedarrays, es2018.asyncgenerator, es2018.asynciterable/esnext.asynciterable, es2018.intl, es2018.promise, es2018.regexp, es2019.array, es2019.object, es2019.string, es2019.symbol/esnext.symbol, es2019.intl, es2020.bigint/esnext.bigint, es2020.date, es2020.promise, es2020.sharedmemory, es2020.string, es2020.symbol.wellknown, es2020.intl, es2020.number, es2021.promise, es2021.string, es2021.weakref/esnext.weakref, es2021.intl, es2022.array, es2022.error, es2022.intl, es2022.object, es2022.sharedmemory, es2022.string/esnext.string, es2022.regexp, es2023.array, es2023.collection, es2023.intl, esnext.array, esnext.collection, esnext.intl, esnext.disposable, esnext.promise, esnext.decorators, esnext.object, esnext.regexp, decorators, decorators.legacy
 default: undefined
 
 --allowJs
diff --git a/tests/baselines/reference/tsserver/telemetry/does-not-expose-paths.js b/tests/baselines/reference/tsserver/telemetry/does-not-expose-paths.js
index 6ff4987c1957c..19c33189826f8 100644
--- a/tests/baselines/reference/tsserver/telemetry/does-not-expose-paths.js
+++ b/tests/baselines/reference/tsserver/telemetry/does-not-expose-paths.js
@@ -443,7 +443,7 @@ Info seq  [hh:mm:ss:mss] event:
               "line": 34,
               "offset": 16
             },
-            "text": "Argument for '--lib' option must be: 'es5', 'es6', 'es2015', 'es7', 'es2016', 'es2017', 'es2018', 'es2019', 'es2020', 'es2021', 'es2022', 'es2023', 'esnext', 'dom', 'dom.iterable', 'dom.asynciterable', 'webworker', 'webworker.importscripts', 'webworker.iterable', 'webworker.asynciterable', 'scripthost', 'es2015.core', 'es2015.collection', 'es2015.generator', 'es2015.iterable', 'es2015.promise', 'es2015.proxy', 'es2015.reflect', 'es2015.symbol', 'es2015.symbol.wellknown', 'es2016.array.include', 'es2016.intl', 'es2017.date', 'es2017.object', 'es2017.sharedmemory', 'es2017.string', 'es2017.intl', 'es2017.typedarrays', 'es2018.asyncgenerator', 'es2018.asynciterable', 'es2018.intl', 'es2018.promise', 'es2018.regexp', 'es2019.array', 'es2019.object', 'es2019.string', 'es2019.symbol', 'es2019.intl', 'es2020.bigint', 'es2020.date', 'es2020.promise', 'es2020.sharedmemory', 'es2020.string', 'es2020.symbol.wellknown', 'es2020.intl', 'es2020.number', 'es2021.promise', 'es2021.string', 'es2021.weakref', 'es2021.intl', 'es2022.array', 'es2022.error', 'es2022.intl', 'es2022.object', 'es2022.sharedmemory', 'es2022.string', 'es2022.regexp', 'es2023.array', 'es2023.collection', 'es2023.intl', 'esnext.array', 'esnext.collection', 'esnext.symbol', 'esnext.asynciterable', 'esnext.intl', 'esnext.disposable', 'esnext.bigint', 'esnext.string', 'esnext.promise', 'esnext.weakref', 'esnext.decorators', 'esnext.object', 'esnext.regexp', 'esnext.iterator', 'decorators', 'decorators.legacy'.",
+            "text": "Argument for '--lib' option must be: 'es5', 'es6', 'es2015', 'es7', 'es2016', 'es2017', 'es2018', 'es2019', 'es2020', 'es2021', 'es2022', 'es2023', 'esnext', 'dom', 'dom.iterable', 'dom.asynciterable', 'webworker', 'webworker.importscripts', 'webworker.iterable', 'webworker.asynciterable', 'scripthost', 'es2015.core', 'es2015.collection', 'es2015.generator', 'es2015.iterable', 'es2015.promise', 'es2015.proxy', 'es2015.reflect', 'es2015.symbol', 'es2015.symbol.wellknown', 'es2016.array.include', 'es2016.intl', 'es2017.date', 'es2017.object', 'es2017.sharedmemory', 'es2017.string', 'es2017.intl', 'es2017.typedarrays', 'es2018.asyncgenerator', 'es2018.asynciterable', 'es2018.intl', 'es2018.promise', 'es2018.regexp', 'es2019.array', 'es2019.object', 'es2019.string', 'es2019.symbol', 'es2019.intl', 'es2020.bigint', 'es2020.date', 'es2020.promise', 'es2020.sharedmemory', 'es2020.string', 'es2020.symbol.wellknown', 'es2020.intl', 'es2020.number', 'es2021.promise', 'es2021.string', 'es2021.weakref', 'es2021.intl', 'es2022.array', 'es2022.error', 'es2022.intl', 'es2022.object', 'es2022.sharedmemory', 'es2022.string', 'es2022.regexp', 'es2023.array', 'es2023.collection', 'es2023.intl', 'esnext.array', 'esnext.collection', 'esnext.symbol', 'esnext.asynciterable', 'esnext.intl', 'esnext.disposable', 'esnext.bigint', 'esnext.string', 'esnext.promise', 'esnext.weakref', 'esnext.decorators', 'esnext.object', 'esnext.regexp', 'decorators', 'decorators.legacy'.",
             "code": 6046,
             "category": "error",
             "fileName": "/tsconfig.json"
diff --git a/tests/baselines/reference/typeGuardConstructorNarrowAny.symbols b/tests/baselines/reference/typeGuardConstructorNarrowAny.symbols
index c9cac7f250e6c..fc87ef85dfbd2 100644
--- a/tests/baselines/reference/typeGuardConstructorNarrowAny.symbols
+++ b/tests/baselines/reference/typeGuardConstructorNarrowAny.symbols
@@ -28,7 +28,7 @@ if (var1.constructor === Boolean) {
 }
 if (var1.constructor === Array) {
 >var1 : Symbol(var1, Decl(typeGuardConstructorNarrowAny.ts, 1, 3))
->Array : Symbol(Array, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.symbol.wellknown.d.ts, --, --) ... and 5 more)
+>Array : Symbol(Array, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.symbol.wellknown.d.ts, --, --) ... and 4 more)
 
     var1; // any[]
 >var1 : Symbol(var1, Decl(typeGuardConstructorNarrowAny.ts, 1, 3))
diff --git a/tests/baselines/reference/typeGuardConstructorPrimitiveTypes.symbols b/tests/baselines/reference/typeGuardConstructorPrimitiveTypes.symbols
index 5e773fc713477..d3f4a65bfcf54 100644
--- a/tests/baselines/reference/typeGuardConstructorPrimitiveTypes.symbols
+++ b/tests/baselines/reference/typeGuardConstructorPrimitiveTypes.symbols
@@ -36,7 +36,7 @@ if (var1.constructor === Array) {
 >var1.constructor : Symbol(Object.constructor, Decl(lib.es5.d.ts, --, --))
 >var1 : Symbol(var1, Decl(typeGuardConstructorPrimitiveTypes.ts, 1, 3))
 >constructor : Symbol(Object.constructor, Decl(lib.es5.d.ts, --, --))
->Array : Symbol(Array, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.symbol.wellknown.d.ts, --, --) ... and 5 more)
+>Array : Symbol(Array, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.symbol.wellknown.d.ts, --, --) ... and 4 more)
 
     var1; // any[]
 >var1 : Symbol(var1, Decl(typeGuardConstructorPrimitiveTypes.ts, 1, 3))
diff --git a/tests/baselines/reference/typeOfYieldWithUnionInContextualReturnType.symbols b/tests/baselines/reference/typeOfYieldWithUnionInContextualReturnType.symbols
index 95a3bfc3c0ba0..5bfb0cb71fe9d 100644
--- a/tests/baselines/reference/typeOfYieldWithUnionInContextualReturnType.symbols
+++ b/tests/baselines/reference/typeOfYieldWithUnionInContextualReturnType.symbols
@@ -5,7 +5,7 @@
 
 type SyncSequenceFactory = () => Generator<string, string, string>;
 >SyncSequenceFactory : Symbol(SyncSequenceFactory, Decl(typeOfYieldWithUnionInContextualReturnType.ts, 0, 0))
->Generator : Symbol(Generator, Decl(lib.es2015.generator.d.ts, --, --), Decl(lib.esnext.iterator.d.ts, --, --))
+>Generator : Symbol(Generator, Decl(lib.es2015.generator.d.ts, --, --))
 
 type AsyncSequenceFactory = () => AsyncGenerator<string, string, string>;
 >AsyncSequenceFactory : Symbol(AsyncSequenceFactory, Decl(typeOfYieldWithUnionInContextualReturnType.ts, 2, 67))
diff --git a/tests/baselines/reference/types.asyncGenerators.es2018.2.symbols b/tests/baselines/reference/types.asyncGenerators.es2018.2.symbols
index ec2eea8b3b443..5fc37ff0791b9 100644
--- a/tests/baselines/reference/types.asyncGenerators.es2018.2.symbols
+++ b/tests/baselines/reference/types.asyncGenerators.es2018.2.symbols
@@ -142,7 +142,7 @@ async function * explicitReturnType11(): Iterable<number> {
 }
 async function * explicitReturnType12(): Iterator<number> {
 >explicitReturnType12 : Symbol(explicitReturnType12, Decl(types.asyncGenerators.es2018.2.ts, 68, 1))
->Iterator : Symbol(Iterator, Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.esnext.iterator.d.ts, --, --))
+>Iterator : Symbol(Iterator, Decl(lib.es2015.iterable.d.ts, --, --))
 
     yield 1;
 }
diff --git a/tests/baselines/reference/typesVersions.ambientModules.trace.json b/tests/baselines/reference/typesVersions.ambientModules.trace.json
index f1bf85fcff11b..d1db5bcce72c1 100644
--- a/tests/baselines/reference/typesVersions.ambientModules.trace.json
+++ b/tests/baselines/reference/typesVersions.ambientModules.trace.json
@@ -1058,20 +1058,6 @@
     "======== Module name '@typescript/lib-esnext/regexp' was not resolved. ========",
     "File '/.ts/package.json' does not exist according to earlier cached lookups.",
     "File '/package.json' does not exist according to earlier cached lookups.",
-    "======== Resolving module '@typescript/lib-esnext/iterator' from '/.src/__lib_node_modules_lookup_lib.esnext.iterator.d.ts__.ts'. ========",
-    "Explicitly specified module resolution kind: 'Node10'.",
-    "Loading module '@typescript/lib-esnext/iterator' from 'node_modules' folder, target file types: TypeScript, Declaration.",
-    "Searching all ancestor node_modules directories for preferred extensions: TypeScript, Declaration.",
-    "Directory '/.src/node_modules/@types' does not exist, skipping all lookups in it.",
-    "Scoped package detected, looking in 'typescript__lib-esnext/iterator'",
-    "Directory '/node_modules' does not exist, skipping all lookups in it.",
-    "Scoped package detected, looking in 'typescript__lib-esnext/iterator'",
-    "Loading module '@typescript/lib-esnext/iterator' from 'node_modules' folder, target file types: JavaScript.",
-    "Searching all ancestor node_modules directories for fallback extensions: JavaScript.",
-    "Directory '/node_modules' does not exist, skipping all lookups in it.",
-    "======== Module name '@typescript/lib-esnext/iterator' was not resolved. ========",
-    "File '/.ts/package.json' does not exist according to earlier cached lookups.",
-    "File '/package.json' does not exist according to earlier cached lookups.",
     "======== Resolving module '@typescript/lib-dom' from '/.src/__lib_node_modules_lookup_lib.dom.d.ts__.ts'. ========",
     "Explicitly specified module resolution kind: 'Node10'.",
     "Loading module '@typescript/lib-dom' from 'node_modules' folder, target file types: TypeScript, Declaration.",
diff --git a/tests/baselines/reference/typesVersions.emptyTypes.trace.json b/tests/baselines/reference/typesVersions.emptyTypes.trace.json
index 0112ce90ea1be..329da7de27ea8 100644
--- a/tests/baselines/reference/typesVersions.emptyTypes.trace.json
+++ b/tests/baselines/reference/typesVersions.emptyTypes.trace.json
@@ -1076,21 +1076,6 @@
     "======== Module name '@typescript/lib-esnext/regexp' was not resolved. ========",
     "File '/.ts/package.json' does not exist according to earlier cached lookups.",
     "File '/package.json' does not exist according to earlier cached lookups.",
-    "======== Resolving module '@typescript/lib-esnext/iterator' from '/.src/__lib_node_modules_lookup_lib.esnext.iterator.d.ts__.ts'. ========",
-    "Explicitly specified module resolution kind: 'Node10'.",
-    "Loading module '@typescript/lib-esnext/iterator' from 'node_modules' folder, target file types: TypeScript, Declaration.",
-    "Searching all ancestor node_modules directories for preferred extensions: TypeScript, Declaration.",
-    "Directory '/.src/node_modules' does not exist, skipping all lookups in it.",
-    "Scoped package detected, looking in 'typescript__lib-esnext/iterator'",
-    "Directory '/node_modules' does not exist, skipping all lookups in it.",
-    "Scoped package detected, looking in 'typescript__lib-esnext/iterator'",
-    "Loading module '@typescript/lib-esnext/iterator' from 'node_modules' folder, target file types: JavaScript.",
-    "Searching all ancestor node_modules directories for fallback extensions: JavaScript.",
-    "Directory '/.src/node_modules' does not exist, skipping all lookups in it.",
-    "Directory '/node_modules' does not exist, skipping all lookups in it.",
-    "======== Module name '@typescript/lib-esnext/iterator' was not resolved. ========",
-    "File '/.ts/package.json' does not exist according to earlier cached lookups.",
-    "File '/package.json' does not exist according to earlier cached lookups.",
     "======== Resolving module '@typescript/lib-dom' from '/.src/__lib_node_modules_lookup_lib.dom.d.ts__.ts'. ========",
     "Explicitly specified module resolution kind: 'Node10'.",
     "Loading module '@typescript/lib-dom' from 'node_modules' folder, target file types: TypeScript, Declaration.",
diff --git a/tests/baselines/reference/typesVersions.justIndex.trace.json b/tests/baselines/reference/typesVersions.justIndex.trace.json
index 5d94e0a04d8fa..107cb19c7d5c9 100644
--- a/tests/baselines/reference/typesVersions.justIndex.trace.json
+++ b/tests/baselines/reference/typesVersions.justIndex.trace.json
@@ -1076,21 +1076,6 @@
     "======== Module name '@typescript/lib-esnext/regexp' was not resolved. ========",
     "File '/.ts/package.json' does not exist according to earlier cached lookups.",
     "File '/package.json' does not exist according to earlier cached lookups.",
-    "======== Resolving module '@typescript/lib-esnext/iterator' from '/.src/__lib_node_modules_lookup_lib.esnext.iterator.d.ts__.ts'. ========",
-    "Explicitly specified module resolution kind: 'Node10'.",
-    "Loading module '@typescript/lib-esnext/iterator' from 'node_modules' folder, target file types: TypeScript, Declaration.",
-    "Searching all ancestor node_modules directories for preferred extensions: TypeScript, Declaration.",
-    "Directory '/.src/node_modules' does not exist, skipping all lookups in it.",
-    "Scoped package detected, looking in 'typescript__lib-esnext/iterator'",
-    "Directory '/node_modules' does not exist, skipping all lookups in it.",
-    "Scoped package detected, looking in 'typescript__lib-esnext/iterator'",
-    "Loading module '@typescript/lib-esnext/iterator' from 'node_modules' folder, target file types: JavaScript.",
-    "Searching all ancestor node_modules directories for fallback extensions: JavaScript.",
-    "Directory '/.src/node_modules' does not exist, skipping all lookups in it.",
-    "Directory '/node_modules' does not exist, skipping all lookups in it.",
-    "======== Module name '@typescript/lib-esnext/iterator' was not resolved. ========",
-    "File '/.ts/package.json' does not exist according to earlier cached lookups.",
-    "File '/package.json' does not exist according to earlier cached lookups.",
     "======== Resolving module '@typescript/lib-dom' from '/.src/__lib_node_modules_lookup_lib.dom.d.ts__.ts'. ========",
     "Explicitly specified module resolution kind: 'Node10'.",
     "Loading module '@typescript/lib-dom' from 'node_modules' folder, target file types: TypeScript, Declaration.",
diff --git a/tests/baselines/reference/typesVersions.multiFile.trace.json b/tests/baselines/reference/typesVersions.multiFile.trace.json
index 20bc9012a3f4e..42f5b7cbf0fc3 100644
--- a/tests/baselines/reference/typesVersions.multiFile.trace.json
+++ b/tests/baselines/reference/typesVersions.multiFile.trace.json
@@ -1021,20 +1021,6 @@
     "======== Module name '@typescript/lib-esnext/regexp' was not resolved. ========",
     "File '/.ts/package.json' does not exist according to earlier cached lookups.",
     "File '/package.json' does not exist according to earlier cached lookups.",
-    "======== Resolving module '@typescript/lib-esnext/iterator' from '/.src/__lib_node_modules_lookup_lib.esnext.iterator.d.ts__.ts'. ========",
-    "Explicitly specified module resolution kind: 'Node10'.",
-    "Loading module '@typescript/lib-esnext/iterator' from 'node_modules' folder, target file types: TypeScript, Declaration.",
-    "Searching all ancestor node_modules directories for preferred extensions: TypeScript, Declaration.",
-    "Directory '/.src/node_modules/@types' does not exist, skipping all lookups in it.",
-    "Scoped package detected, looking in 'typescript__lib-esnext/iterator'",
-    "Directory '/node_modules' does not exist, skipping all lookups in it.",
-    "Scoped package detected, looking in 'typescript__lib-esnext/iterator'",
-    "Loading module '@typescript/lib-esnext/iterator' from 'node_modules' folder, target file types: JavaScript.",
-    "Searching all ancestor node_modules directories for fallback extensions: JavaScript.",
-    "Directory '/node_modules' does not exist, skipping all lookups in it.",
-    "======== Module name '@typescript/lib-esnext/iterator' was not resolved. ========",
-    "File '/.ts/package.json' does not exist according to earlier cached lookups.",
-    "File '/package.json' does not exist according to earlier cached lookups.",
     "======== Resolving module '@typescript/lib-dom' from '/.src/__lib_node_modules_lookup_lib.dom.d.ts__.ts'. ========",
     "Explicitly specified module resolution kind: 'Node10'.",
     "Loading module '@typescript/lib-dom' from 'node_modules' folder, target file types: TypeScript, Declaration.",
diff --git a/tests/baselines/reference/typesVersionsDeclarationEmit.ambient.trace.json b/tests/baselines/reference/typesVersionsDeclarationEmit.ambient.trace.json
index f1bf85fcff11b..d1db5bcce72c1 100644
--- a/tests/baselines/reference/typesVersionsDeclarationEmit.ambient.trace.json
+++ b/tests/baselines/reference/typesVersionsDeclarationEmit.ambient.trace.json
@@ -1058,20 +1058,6 @@
     "======== Module name '@typescript/lib-esnext/regexp' was not resolved. ========",
     "File '/.ts/package.json' does not exist according to earlier cached lookups.",
     "File '/package.json' does not exist according to earlier cached lookups.",
-    "======== Resolving module '@typescript/lib-esnext/iterator' from '/.src/__lib_node_modules_lookup_lib.esnext.iterator.d.ts__.ts'. ========",
-    "Explicitly specified module resolution kind: 'Node10'.",
-    "Loading module '@typescript/lib-esnext/iterator' from 'node_modules' folder, target file types: TypeScript, Declaration.",
-    "Searching all ancestor node_modules directories for preferred extensions: TypeScript, Declaration.",
-    "Directory '/.src/node_modules/@types' does not exist, skipping all lookups in it.",
-    "Scoped package detected, looking in 'typescript__lib-esnext/iterator'",
-    "Directory '/node_modules' does not exist, skipping all lookups in it.",
-    "Scoped package detected, looking in 'typescript__lib-esnext/iterator'",
-    "Loading module '@typescript/lib-esnext/iterator' from 'node_modules' folder, target file types: JavaScript.",
-    "Searching all ancestor node_modules directories for fallback extensions: JavaScript.",
-    "Directory '/node_modules' does not exist, skipping all lookups in it.",
-    "======== Module name '@typescript/lib-esnext/iterator' was not resolved. ========",
-    "File '/.ts/package.json' does not exist according to earlier cached lookups.",
-    "File '/package.json' does not exist according to earlier cached lookups.",
     "======== Resolving module '@typescript/lib-dom' from '/.src/__lib_node_modules_lookup_lib.dom.d.ts__.ts'. ========",
     "Explicitly specified module resolution kind: 'Node10'.",
     "Loading module '@typescript/lib-dom' from 'node_modules' folder, target file types: TypeScript, Declaration.",
diff --git a/tests/baselines/reference/typesVersionsDeclarationEmit.multiFile.trace.json b/tests/baselines/reference/typesVersionsDeclarationEmit.multiFile.trace.json
index 20bc9012a3f4e..42f5b7cbf0fc3 100644
--- a/tests/baselines/reference/typesVersionsDeclarationEmit.multiFile.trace.json
+++ b/tests/baselines/reference/typesVersionsDeclarationEmit.multiFile.trace.json
@@ -1021,20 +1021,6 @@
     "======== Module name '@typescript/lib-esnext/regexp' was not resolved. ========",
     "File '/.ts/package.json' does not exist according to earlier cached lookups.",
     "File '/package.json' does not exist according to earlier cached lookups.",
-    "======== Resolving module '@typescript/lib-esnext/iterator' from '/.src/__lib_node_modules_lookup_lib.esnext.iterator.d.ts__.ts'. ========",
-    "Explicitly specified module resolution kind: 'Node10'.",
-    "Loading module '@typescript/lib-esnext/iterator' from 'node_modules' folder, target file types: TypeScript, Declaration.",
-    "Searching all ancestor node_modules directories for preferred extensions: TypeScript, Declaration.",
-    "Directory '/.src/node_modules/@types' does not exist, skipping all lookups in it.",
-    "Scoped package detected, looking in 'typescript__lib-esnext/iterator'",
-    "Directory '/node_modules' does not exist, skipping all lookups in it.",
-    "Scoped package detected, looking in 'typescript__lib-esnext/iterator'",
-    "Loading module '@typescript/lib-esnext/iterator' from 'node_modules' folder, target file types: JavaScript.",
-    "Searching all ancestor node_modules directories for fallback extensions: JavaScript.",
-    "Directory '/node_modules' does not exist, skipping all lookups in it.",
-    "======== Module name '@typescript/lib-esnext/iterator' was not resolved. ========",
-    "File '/.ts/package.json' does not exist according to earlier cached lookups.",
-    "File '/package.json' does not exist according to earlier cached lookups.",
     "======== Resolving module '@typescript/lib-dom' from '/.src/__lib_node_modules_lookup_lib.dom.d.ts__.ts'. ========",
     "Explicitly specified module resolution kind: 'Node10'.",
     "Loading module '@typescript/lib-dom' from 'node_modules' folder, target file types: TypeScript, Declaration.",
diff --git a/tests/baselines/reference/typesVersionsDeclarationEmit.multiFileBackReferenceToSelf.trace.json b/tests/baselines/reference/typesVersionsDeclarationEmit.multiFileBackReferenceToSelf.trace.json
index 8e21e27a4469f..774007ccd8a66 100644
--- a/tests/baselines/reference/typesVersionsDeclarationEmit.multiFileBackReferenceToSelf.trace.json
+++ b/tests/baselines/reference/typesVersionsDeclarationEmit.multiFileBackReferenceToSelf.trace.json
@@ -1044,20 +1044,6 @@
     "======== Module name '@typescript/lib-esnext/regexp' was not resolved. ========",
     "File '/.ts/package.json' does not exist according to earlier cached lookups.",
     "File '/package.json' does not exist according to earlier cached lookups.",
-    "======== Resolving module '@typescript/lib-esnext/iterator' from '/.src/__lib_node_modules_lookup_lib.esnext.iterator.d.ts__.ts'. ========",
-    "Explicitly specified module resolution kind: 'Node10'.",
-    "Loading module '@typescript/lib-esnext/iterator' from 'node_modules' folder, target file types: TypeScript, Declaration.",
-    "Searching all ancestor node_modules directories for preferred extensions: TypeScript, Declaration.",
-    "Directory '/.src/node_modules/@types' does not exist, skipping all lookups in it.",
-    "Scoped package detected, looking in 'typescript__lib-esnext/iterator'",
-    "Directory '/node_modules' does not exist, skipping all lookups in it.",
-    "Scoped package detected, looking in 'typescript__lib-esnext/iterator'",
-    "Loading module '@typescript/lib-esnext/iterator' from 'node_modules' folder, target file types: JavaScript.",
-    "Searching all ancestor node_modules directories for fallback extensions: JavaScript.",
-    "Directory '/node_modules' does not exist, skipping all lookups in it.",
-    "======== Module name '@typescript/lib-esnext/iterator' was not resolved. ========",
-    "File '/.ts/package.json' does not exist according to earlier cached lookups.",
-    "File '/package.json' does not exist according to earlier cached lookups.",
     "======== Resolving module '@typescript/lib-dom' from '/.src/__lib_node_modules_lookup_lib.dom.d.ts__.ts'. ========",
     "Explicitly specified module resolution kind: 'Node10'.",
     "Loading module '@typescript/lib-dom' from 'node_modules' folder, target file types: TypeScript, Declaration.",
diff --git a/tests/baselines/reference/typesVersionsDeclarationEmit.multiFileBackReferenceToUnmapped.trace.json b/tests/baselines/reference/typesVersionsDeclarationEmit.multiFileBackReferenceToUnmapped.trace.json
index a6f48a6af4e0a..74258268ae864 100644
--- a/tests/baselines/reference/typesVersionsDeclarationEmit.multiFileBackReferenceToUnmapped.trace.json
+++ b/tests/baselines/reference/typesVersionsDeclarationEmit.multiFileBackReferenceToUnmapped.trace.json
@@ -1026,20 +1026,6 @@
     "======== Module name '@typescript/lib-esnext/regexp' was not resolved. ========",
     "File '/.ts/package.json' does not exist according to earlier cached lookups.",
     "File '/package.json' does not exist according to earlier cached lookups.",
-    "======== Resolving module '@typescript/lib-esnext/iterator' from '/.src/__lib_node_modules_lookup_lib.esnext.iterator.d.ts__.ts'. ========",
-    "Explicitly specified module resolution kind: 'Node10'.",
-    "Loading module '@typescript/lib-esnext/iterator' from 'node_modules' folder, target file types: TypeScript, Declaration.",
-    "Searching all ancestor node_modules directories for preferred extensions: TypeScript, Declaration.",
-    "Directory '/.src/node_modules/@types' does not exist, skipping all lookups in it.",
-    "Scoped package detected, looking in 'typescript__lib-esnext/iterator'",
-    "Directory '/node_modules' does not exist, skipping all lookups in it.",
-    "Scoped package detected, looking in 'typescript__lib-esnext/iterator'",
-    "Loading module '@typescript/lib-esnext/iterator' from 'node_modules' folder, target file types: JavaScript.",
-    "Searching all ancestor node_modules directories for fallback extensions: JavaScript.",
-    "Directory '/node_modules' does not exist, skipping all lookups in it.",
-    "======== Module name '@typescript/lib-esnext/iterator' was not resolved. ========",
-    "File '/.ts/package.json' does not exist according to earlier cached lookups.",
-    "File '/package.json' does not exist according to earlier cached lookups.",
     "======== Resolving module '@typescript/lib-dom' from '/.src/__lib_node_modules_lookup_lib.dom.d.ts__.ts'. ========",
     "Explicitly specified module resolution kind: 'Node10'.",
     "Loading module '@typescript/lib-dom' from 'node_modules' folder, target file types: TypeScript, Declaration.",
diff --git a/tests/baselines/reference/unionAndIntersectionInference3.symbols b/tests/baselines/reference/unionAndIntersectionInference3.symbols
index 41531386e789d..e84536ec7cc72 100644
--- a/tests/baselines/reference/unionAndIntersectionInference3.symbols
+++ b/tests/baselines/reference/unionAndIntersectionInference3.symbols
@@ -29,7 +29,7 @@ const g: <U, R, S>(com: () => Iterator<S, U, R> | AsyncIterator<S, U, R>) => Pro
 >R : Symbol(R, Decl(unionAndIntersectionInference3.ts, 8, 12))
 >S : Symbol(S, Decl(unionAndIntersectionInference3.ts, 8, 15))
 >com : Symbol(com, Decl(unionAndIntersectionInference3.ts, 8, 19))
->Iterator : Symbol(Iterator, Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.esnext.iterator.d.ts, --, --))
+>Iterator : Symbol(Iterator, Decl(lib.es2015.iterable.d.ts, --, --))
 >S : Symbol(S, Decl(unionAndIntersectionInference3.ts, 8, 15))
 >U : Symbol(U, Decl(unionAndIntersectionInference3.ts, 8, 10))
 >R : Symbol(R, Decl(unionAndIntersectionInference3.ts, 8, 12))
@@ -43,7 +43,7 @@ const g: <U, R, S>(com: () => Iterator<S, U, R> | AsyncIterator<S, U, R>) => Pro
 >R : Symbol(R, Decl(unionAndIntersectionInference3.ts, 8, 99))
 >S : Symbol(S, Decl(unionAndIntersectionInference3.ts, 8, 102))
 >com : Symbol(com, Decl(unionAndIntersectionInference3.ts, 8, 106))
->Iterator : Symbol(Iterator, Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.esnext.iterator.d.ts, --, --))
+>Iterator : Symbol(Iterator, Decl(lib.es2015.iterable.d.ts, --, --))
 >S : Symbol(S, Decl(unionAndIntersectionInference3.ts, 8, 102))
 >U : Symbol(U, Decl(unionAndIntersectionInference3.ts, 8, 97))
 >R : Symbol(R, Decl(unionAndIntersectionInference3.ts, 8, 99))
diff --git a/tests/cases/compiler/nativeIterator.ts b/tests/cases/compiler/nativeIterator.ts
deleted file mode 100644
index 7d7f445449806..0000000000000
--- a/tests/cases/compiler/nativeIterator.ts
+++ /dev/null
@@ -1,30 +0,0 @@
-// @target: esnext
-
-const iterator = Iterator.from([0, 1, 2]);
-
-const mapped = iterator.map(String);
-
-const filtered = iterator.filter(x => x > 0);
-
-function isZero(x: number): x is 0 {
-  return x === 0;
-}
-const zero = iterator.filter(isZero);
-
-const iteratorFromBare = Iterator.from({
-  next() {
-    return {
-      done: Math.random() < .5,
-      value: "a string",
-    };
-  },
-});
-
-
-function* gen() {
-  yield 0;
-}
-
-const mappedGen = gen().map(x => x === 0 ? "zero" : "other");
-
-const mappedValues = [0, 1, 2].values().map(x => x === 0 ? "zero" : "other");

From f5393db657427d6afae9dbf11e7abfba0f615da5 Mon Sep 17 00:00:00 2001
From: Kevin Gibbons <bakkot@gmail.com>
Date: Wed, 17 Apr 2024 16:00:35 -0700
Subject: [PATCH 5/9] add BuiltinIterator and switch existing IterableIterator
 uses to that

---
 src/lib/dom.iterable.d.ts            |  46 +++++-----
 src/lib/es2015.generator.d.ts        |   2 +-
 src/lib/es2015.iterable.d.ts         | 128 ++++++++++++++-------------
 src/lib/es2020.bigint.d.ts           |  16 ++--
 src/lib/es2020.string.d.ts           |   2 +-
 src/lib/es2020.symbol.wellknown.d.ts |   2 +-
 src/lib/es2022.intl.d.ts             |   2 +-
 7 files changed, 101 insertions(+), 97 deletions(-)

diff --git a/src/lib/dom.iterable.d.ts b/src/lib/dom.iterable.d.ts
index 8ffbcd4811b55..4d255b05b05c4 100644
--- a/src/lib/dom.iterable.d.ts
+++ b/src/lib/dom.iterable.d.ts
@@ -1,30 +1,30 @@
 /// <reference lib="dom" />
 
 interface DOMTokenList {
-    [Symbol.iterator](): IterableIterator<string>;
+    [Symbol.iterator](): BuiltinIterator<string>;
 }
 
 interface Headers {
-    [Symbol.iterator](): IterableIterator<[string, string]>;
+    [Symbol.iterator](): BuiltinIterator<[string, string]>;
     /**
      * Returns an iterator allowing to go through all key/value pairs contained in this object.
      */
-    entries(): IterableIterator<[string, string]>;
+    entries(): BuiltinIterator<[string, string]>;
     /**
      * Returns an iterator allowing to go through all keys f the key/value pairs contained in this object.
      */
-    keys(): IterableIterator<string>;
+    keys(): BuiltinIterator<string>;
     /**
      * Returns an iterator allowing to go through all values of the key/value pairs contained in this object.
      */
-    values(): IterableIterator<string>;
+    values(): BuiltinIterator<string>;
 }
 
 interface NodeList {
     /**
      * Returns an array of key, value pairs for every entry in the list
      */
-    entries(): IterableIterator<[number, Node]>;
+    entries(): BuiltinIterator<[number, Node]>;
     /**
      * Performs the specified action for each node in an list.
      * @param callbackfn  A function that accepts up to three arguments. forEach calls the callbackfn function one time for each element in the list.
@@ -34,21 +34,21 @@ interface NodeList {
     /**
      * Returns an list of keys in the list
      */
-    keys(): IterableIterator<number>;
+    keys(): BuiltinIterator<number>;
 
     /**
      * Returns an list of values in the list
      */
-    values(): IterableIterator<Node>;
+    values(): BuiltinIterator<Node>;
 
-    [Symbol.iterator](): IterableIterator<Node>;
+    [Symbol.iterator](): BuiltinIterator<Node>;
 }
 
 interface NodeListOf<TNode extends Node> {
     /**
      * Returns an array of key, value pairs for every entry in the list
      */
-    entries(): IterableIterator<[number, TNode]>;
+    entries(): BuiltinIterator<[number, TNode]>;
 
     /**
      * Performs the specified action for each node in an list.
@@ -59,55 +59,55 @@ interface NodeListOf<TNode extends Node> {
     /**
      * Returns an list of keys in the list
      */
-    keys(): IterableIterator<number>;
+    keys(): BuiltinIterator<number>;
     /**
      * Returns an list of values in the list
      */
-    values(): IterableIterator<TNode>;
+    values(): BuiltinIterator<TNode>;
 
-    [Symbol.iterator](): IterableIterator<TNode>;
+    [Symbol.iterator](): BuiltinIterator<TNode>;
 }
 
 interface HTMLCollectionBase {
-    [Symbol.iterator](): IterableIterator<Element>;
+    [Symbol.iterator](): BuiltinIterator<Element>;
 }
 
 interface HTMLCollectionOf<T extends Element> {
-    [Symbol.iterator](): IterableIterator<T>;
+    [Symbol.iterator](): BuiltinIterator<T>;
 }
 
 interface FormData {
     /**
      * Returns an array of key, value pairs for every entry in the list
      */
-    entries(): IterableIterator<[string, string | File]>;
+    entries(): BuiltinIterator<[string, string | File]>;
     /**
      * Returns a list of keys in the list
      */
-    keys(): IterableIterator<string>;
+    keys(): BuiltinIterator<string>;
     /**
      * Returns a list of values in the list
      */
-    values(): IterableIterator<string | File>;
+    values(): BuiltinIterator<string | File>;
 
-    [Symbol.iterator](): IterableIterator<string | File>;
+    [Symbol.iterator](): BuiltinIterator<string | File>;
 }
 
 interface URLSearchParams {
     /**
      * Returns an array of key, value pairs for every entry in the search params
      */
-    entries(): IterableIterator<[string, string]>;
+    entries(): BuiltinIterator<[string, string]>;
     /**
      * Returns a list of keys in the search params
      */
-    keys(): IterableIterator<string>;
+    keys(): BuiltinIterator<string>;
     /**
      * Returns a list of values in the search params
      */
-    values(): IterableIterator<string>;
+    values(): BuiltinIterator<string>;
     /**
      * iterate over key/value pairs
      */
-    [Symbol.iterator](): IterableIterator<[string, string]>;
+    [Symbol.iterator](): BuiltinIterator<[string, string]>;
 }
diff --git a/src/lib/es2015.generator.d.ts b/src/lib/es2015.generator.d.ts
index 7c6929173a0e4..952cad5b5db51 100644
--- a/src/lib/es2015.generator.d.ts
+++ b/src/lib/es2015.generator.d.ts
@@ -1,6 +1,6 @@
 /// <reference lib="es2015.iterable" />
 
-interface Generator<T = unknown, TReturn = any, TNext = unknown> extends Iterator<T, TReturn, TNext> {
+interface Generator<T = unknown, TReturn = any, TNext = unknown> extends BuiltinIterator<T, TReturn, TNext> {
     // NOTE: 'next' is defined using a tuple to ensure we report the correct assignability errors in all places.
     next(...args: [] | [TNext]): IteratorResult<T, TReturn>;
     return(value: TReturn): IteratorResult<T, TReturn>;
diff --git a/src/lib/es2015.iterable.d.ts b/src/lib/es2015.iterable.d.ts
index d28b8381eec86..f7f1960eb8671 100644
--- a/src/lib/es2015.iterable.d.ts
+++ b/src/lib/es2015.iterable.d.ts
@@ -27,6 +27,10 @@ interface Iterator<T, TReturn = any, TNext = undefined> {
     throw?(e?: any): IteratorResult<T, TReturn>;
 }
 
+interface BuiltinIterator<T, TReturn = void, TNext = undefined> extends Iterator<T, TReturn, TNext> {
+    [Symbol.iterator](): BuiltinIterator<T, TReturn, TNext>;
+}
+
 interface Iterable<T> {
     [Symbol.iterator](): Iterator<T>;
 }
@@ -37,22 +41,22 @@ interface IterableIterator<T> extends Iterator<T> {
 
 interface Array<T> {
     /** Iterator */
-    [Symbol.iterator](): IterableIterator<T>;
+    [Symbol.iterator](): BuiltinIterator<T>;
 
     /**
      * Returns an iterable of key, value pairs for every entry in the array
      */
-    entries(): IterableIterator<[number, T]>;
+    entries(): BuiltinIterator<[number, T]>;
 
     /**
      * Returns an iterable of keys in the array
      */
-    keys(): IterableIterator<number>;
+    keys(): BuiltinIterator<number>;
 
     /**
      * Returns an iterable of values in the array
      */
-    values(): IterableIterator<T>;
+    values(): BuiltinIterator<T>;
 }
 
 interface ArrayConstructor {
@@ -73,67 +77,67 @@ interface ArrayConstructor {
 
 interface ReadonlyArray<T> {
     /** Iterator of values in the array. */
-    [Symbol.iterator](): IterableIterator<T>;
+    [Symbol.iterator](): BuiltinIterator<T>;
 
     /**
      * Returns an iterable of key, value pairs for every entry in the array
      */
-    entries(): IterableIterator<[number, T]>;
+    entries(): BuiltinIterator<[number, T]>;
 
     /**
      * Returns an iterable of keys in the array
      */
-    keys(): IterableIterator<number>;
+    keys(): BuiltinIterator<number>;
 
     /**
      * Returns an iterable of values in the array
      */
-    values(): IterableIterator<T>;
+    values(): BuiltinIterator<T>;
 }
 
 interface IArguments {
     /** Iterator */
-    [Symbol.iterator](): IterableIterator<any>;
+    [Symbol.iterator](): BuiltinIterator<any>;
 }
 
 interface Map<K, V> {
     /** Returns an iterable of entries in the map. */
-    [Symbol.iterator](): IterableIterator<[K, V]>;
+    [Symbol.iterator](): BuiltinIterator<[K, V]>;
 
     /**
      * Returns an iterable of key, value pairs for every entry in the map.
      */
-    entries(): IterableIterator<[K, V]>;
+    entries(): BuiltinIterator<[K, V]>;
 
     /**
      * Returns an iterable of keys in the map
      */
-    keys(): IterableIterator<K>;
+    keys(): BuiltinIterator<K>;
 
     /**
      * Returns an iterable of values in the map
      */
-    values(): IterableIterator<V>;
+    values(): BuiltinIterator<V>;
 }
 
 interface ReadonlyMap<K, V> {
     /** Returns an iterable of entries in the map. */
-    [Symbol.iterator](): IterableIterator<[K, V]>;
+    [Symbol.iterator](): BuiltinIterator<[K, V]>;
 
     /**
      * Returns an iterable of key, value pairs for every entry in the map.
      */
-    entries(): IterableIterator<[K, V]>;
+    entries(): BuiltinIterator<[K, V]>;
 
     /**
      * Returns an iterable of keys in the map
      */
-    keys(): IterableIterator<K>;
+    keys(): BuiltinIterator<K>;
 
     /**
      * Returns an iterable of values in the map
      */
-    values(): IterableIterator<V>;
+    values(): BuiltinIterator<V>;
 }
 
 interface MapConstructor {
@@ -149,40 +153,40 @@ interface WeakMapConstructor {
 
 interface Set<T> {
     /** Iterates over values in the set. */
-    [Symbol.iterator](): IterableIterator<T>;
+    [Symbol.iterator](): BuiltinIterator<T>;
     /**
      * Returns an iterable of [v,v] pairs for every value `v` in the set.
      */
-    entries(): IterableIterator<[T, T]>;
+    entries(): BuiltinIterator<[T, T]>;
     /**
      * Despite its name, returns an iterable of the values in the set.
      */
-    keys(): IterableIterator<T>;
+    keys(): BuiltinIterator<T>;
 
     /**
      * Returns an iterable of values in the set.
      */
-    values(): IterableIterator<T>;
+    values(): BuiltinIterator<T>;
 }
 
 interface ReadonlySet<T> {
     /** Iterates over values in the set. */
-    [Symbol.iterator](): IterableIterator<T>;
+    [Symbol.iterator](): BuiltinIterator<T>;
 
     /**
      * Returns an iterable of [v,v] pairs for every value `v` in the set.
      */
-    entries(): IterableIterator<[T, T]>;
+    entries(): BuiltinIterator<[T, T]>;
 
     /**
      * Despite its name, returns an iterable of the values in the set.
      */
-    keys(): IterableIterator<T>;
+    keys(): BuiltinIterator<T>;
 
     /**
      * Returns an iterable of values in the set.
      */
-    values(): IterableIterator<T>;
+    values(): BuiltinIterator<T>;
 }
 
 interface SetConstructor {
@@ -217,23 +221,23 @@ interface PromiseConstructor {
 
 interface String {
     /** Iterator */
-    [Symbol.iterator](): IterableIterator<string>;
+    [Symbol.iterator](): BuiltinIterator<string>;
 }
 
 interface Int8Array {
-    [Symbol.iterator](): IterableIterator<number>;
+    [Symbol.iterator](): BuiltinIterator<number>;
     /**
      * Returns an array of key, value pairs for every entry in the array
      */
-    entries(): IterableIterator<[number, number]>;
+    entries(): BuiltinIterator<[number, number]>;
     /**
      * Returns an list of keys in the array
      */
-    keys(): IterableIterator<number>;
+    keys(): BuiltinIterator<number>;
     /**
      * Returns an list of values in the array
      */
-    values(): IterableIterator<number>;
+    values(): BuiltinIterator<number>;
 }
 
 interface Int8ArrayConstructor {
@@ -249,19 +253,19 @@ interface Int8ArrayConstructor {
 }
 
 interface Uint8Array {
-    [Symbol.iterator](): IterableIterator<number>;
+    [Symbol.iterator](): BuiltinIterator<number>;
     /**
      * Returns an array of key, value pairs for every entry in the array
      */
-    entries(): IterableIterator<[number, number]>;
+    entries(): BuiltinIterator<[number, number]>;
     /**
      * Returns an list of keys in the array
      */
-    keys(): IterableIterator<number>;
+    keys(): BuiltinIterator<number>;
     /**
      * Returns an list of values in the array
      */
-    values(): IterableIterator<number>;
+    values(): BuiltinIterator<number>;
 }
 
 interface Uint8ArrayConstructor {
@@ -277,21 +281,21 @@ interface Uint8ArrayConstructor {
 }
 
 interface Uint8ClampedArray {
-    [Symbol.iterator](): IterableIterator<number>;
+    [Symbol.iterator](): BuiltinIterator<number>;
     /**
      * Returns an array of key, value pairs for every entry in the array
      */
-    entries(): IterableIterator<[number, number]>;
+    entries(): BuiltinIterator<[number, number]>;
 
     /**
      * Returns an list of keys in the array
      */
-    keys(): IterableIterator<number>;
+    keys(): BuiltinIterator<number>;
 
     /**
      * Returns an list of values in the array
      */
-    values(): IterableIterator<number>;
+    values(): BuiltinIterator<number>;
 }
 
 interface Uint8ClampedArrayConstructor {
@@ -307,21 +311,21 @@ interface Uint8ClampedArrayConstructor {
 }
 
 interface Int16Array {
-    [Symbol.iterator](): IterableIterator<number>;
+    [Symbol.iterator](): BuiltinIterator<number>;
     /**
      * Returns an array of key, value pairs for every entry in the array
      */
-    entries(): IterableIterator<[number, number]>;
+    entries(): BuiltinIterator<[number, number]>;
 
     /**
      * Returns an list of keys in the array
      */
-    keys(): IterableIterator<number>;
+    keys(): BuiltinIterator<number>;
 
     /**
      * Returns an list of values in the array
      */
-    values(): IterableIterator<number>;
+    values(): BuiltinIterator<number>;
 }
 
 interface Int16ArrayConstructor {
@@ -337,19 +341,19 @@ interface Int16ArrayConstructor {
 }
 
 interface Uint16Array {
-    [Symbol.iterator](): IterableIterator<number>;
+    [Symbol.iterator](): BuiltinIterator<number>;
     /**
      * Returns an array of key, value pairs for every entry in the array
      */
-    entries(): IterableIterator<[number, number]>;
+    entries(): BuiltinIterator<[number, number]>;
     /**
      * Returns an list of keys in the array
      */
-    keys(): IterableIterator<number>;
+    keys(): BuiltinIterator<number>;
     /**
      * Returns an list of values in the array
      */
-    values(): IterableIterator<number>;
+    values(): BuiltinIterator<number>;
 }
 
 interface Uint16ArrayConstructor {
@@ -365,19 +369,19 @@ interface Uint16ArrayConstructor {
 }
 
 interface Int32Array {
-    [Symbol.iterator](): IterableIterator<number>;
+    [Symbol.iterator](): BuiltinIterator<number>;
     /**
      * Returns an array of key, value pairs for every entry in the array
      */
-    entries(): IterableIterator<[number, number]>;
+    entries(): BuiltinIterator<[number, number]>;
     /**
      * Returns an list of keys in the array
      */
-    keys(): IterableIterator<number>;
+    keys(): BuiltinIterator<number>;
     /**
      * Returns an list of values in the array
      */
-    values(): IterableIterator<number>;
+    values(): BuiltinIterator<number>;
 }
 
 interface Int32ArrayConstructor {
@@ -393,19 +397,19 @@ interface Int32ArrayConstructor {
 }
 
 interface Uint32Array {
-    [Symbol.iterator](): IterableIterator<number>;
+    [Symbol.iterator](): BuiltinIterator<number>;
     /**
      * Returns an array of key, value pairs for every entry in the array
      */
-    entries(): IterableIterator<[number, number]>;
+    entries(): BuiltinIterator<[number, number]>;
     /**
      * Returns an list of keys in the array
      */
-    keys(): IterableIterator<number>;
+    keys(): BuiltinIterator<number>;
     /**
      * Returns an list of values in the array
      */
-    values(): IterableIterator<number>;
+    values(): BuiltinIterator<number>;
 }
 
 interface Uint32ArrayConstructor {
@@ -421,19 +425,19 @@ interface Uint32ArrayConstructor {
 }
 
 interface Float32Array {
-    [Symbol.iterator](): IterableIterator<number>;
+    [Symbol.iterator](): BuiltinIterator<number>;
     /**
      * Returns an array of key, value pairs for every entry in the array
      */
-    entries(): IterableIterator<[number, number]>;
+    entries(): BuiltinIterator<[number, number]>;
     /**
      * Returns an list of keys in the array
      */
-    keys(): IterableIterator<number>;
+    keys(): BuiltinIterator<number>;
     /**
      * Returns an list of values in the array
      */
-    values(): IterableIterator<number>;
+    values(): BuiltinIterator<number>;
 }
 
 interface Float32ArrayConstructor {
@@ -449,19 +453,19 @@ interface Float32ArrayConstructor {
 }
 
 interface Float64Array {
-    [Symbol.iterator](): IterableIterator<number>;
+    [Symbol.iterator](): BuiltinIterator<number>;
     /**
      * Returns an array of key, value pairs for every entry in the array
      */
-    entries(): IterableIterator<[number, number]>;
+    entries(): BuiltinIterator<[number, number]>;
     /**
      * Returns an list of keys in the array
      */
-    keys(): IterableIterator<number>;
+    keys(): BuiltinIterator<number>;
     /**
      * Returns an list of values in the array
      */
-    values(): IterableIterator<number>;
+    values(): BuiltinIterator<number>;
 }
 
 interface Float64ArrayConstructor {
diff --git a/src/lib/es2020.bigint.d.ts b/src/lib/es2020.bigint.d.ts
index b4b46c7d9bb15..65455531ebd9a 100644
--- a/src/lib/es2020.bigint.d.ts
+++ b/src/lib/es2020.bigint.d.ts
@@ -153,7 +153,7 @@ interface BigInt64Array {
     copyWithin(target: number, start: number, end?: number): this;
 
     /** Yields index, value pairs for every entry in the array. */
-    entries(): IterableIterator<[number, bigint]>;
+    entries(): BuiltinIterator<[number, bigint]>;
 
     /**
      * Determines whether all the members of an array satisfy the specified test.
@@ -238,7 +238,7 @@ interface BigInt64Array {
     join(separator?: string): string;
 
     /** Yields each index in the array. */
-    keys(): IterableIterator<number>;
+    keys(): BuiltinIterator<number>;
 
     /**
      * Returns the index of the last occurrence of a value in an array.
@@ -360,9 +360,9 @@ interface BigInt64Array {
     valueOf(): BigInt64Array;
 
     /** Yields each value in the array. */
-    values(): IterableIterator<bigint>;
+    values(): BuiltinIterator<bigint>;
 
-    [Symbol.iterator](): IterableIterator<bigint>;
+    [Symbol.iterator](): BuiltinIterator<bigint>;
 
     readonly [Symbol.toStringTag]: "BigInt64Array";
 
@@ -425,7 +425,7 @@ interface BigUint64Array {
     copyWithin(target: number, start: number, end?: number): this;
 
     /** Yields index, value pairs for every entry in the array. */
-    entries(): IterableIterator<[number, bigint]>;
+    entries(): BuiltinIterator<[number, bigint]>;
 
     /**
      * Determines whether all the members of an array satisfy the specified test.
@@ -510,7 +510,7 @@ interface BigUint64Array {
     join(separator?: string): string;
 
     /** Yields each index in the array. */
-    keys(): IterableIterator<number>;
+    keys(): BuiltinIterator<number>;
 
     /**
      * Returns the index of the last occurrence of a value in an array.
@@ -632,9 +632,9 @@ interface BigUint64Array {
     valueOf(): BigUint64Array;
 
     /** Yields each value in the array. */
-    values(): IterableIterator<bigint>;
+    values(): BuiltinIterator<bigint>;
 
-    [Symbol.iterator](): IterableIterator<bigint>;
+    [Symbol.iterator](): BuiltinIterator<bigint>;
 
     readonly [Symbol.toStringTag]: "BigUint64Array";
 
diff --git a/src/lib/es2020.string.d.ts b/src/lib/es2020.string.d.ts
index bc7cf1ad5f7c3..134bf83c2770c 100644
--- a/src/lib/es2020.string.d.ts
+++ b/src/lib/es2020.string.d.ts
@@ -6,7 +6,7 @@ interface String {
      * containing the results of that search.
      * @param regexp A variable name or string literal containing the regular expression pattern and flags.
      */
-    matchAll(regexp: RegExp): IterableIterator<RegExpExecArray>;
+    matchAll(regexp: RegExp): BuiltinIterator<RegExpExecArray>;
 
     /** Converts all alphabetic characters to lowercase, taking into account the host environment's current locale. */
     toLocaleLowerCase(locales?: Intl.LocalesArgument): string;
diff --git a/src/lib/es2020.symbol.wellknown.d.ts b/src/lib/es2020.symbol.wellknown.d.ts
index 94a11768256c7..2298af614060c 100644
--- a/src/lib/es2020.symbol.wellknown.d.ts
+++ b/src/lib/es2020.symbol.wellknown.d.ts
@@ -15,5 +15,5 @@ interface RegExp {
      * containing the results of that search.
      * @param string A string to search within.
      */
-    [Symbol.matchAll](str: string): IterableIterator<RegExpMatchArray>;
+    [Symbol.matchAll](str: string): BuiltinIterator<RegExpMatchArray>;
 }
diff --git a/src/lib/es2022.intl.d.ts b/src/lib/es2022.intl.d.ts
index 3beaea6af8ddd..4cb8d53184ce2 100644
--- a/src/lib/es2022.intl.d.ts
+++ b/src/lib/es2022.intl.d.ts
@@ -37,7 +37,7 @@ declare namespace Intl {
         containing(codeUnitIndex?: number): SegmentData;
 
         /** Returns an iterator to iterate over the segments. */
-        [Symbol.iterator](): IterableIterator<SegmentData>;
+        [Symbol.iterator](): BuiltinIterator<SegmentData>;
     }
 
     interface SegmentData {

From ebc4e71095f4c94b28872cb1f78afa2fd3753c61 Mon Sep 17 00:00:00 2001
From: Kevin Gibbons <bakkot@gmail.com>
Date: Wed, 17 Apr 2024 16:10:45 -0700
Subject: [PATCH 6/9] add AsyncBuiltinIterator and switch existing
 AsyncIterableIterator uses to that

---
 src/lib/es2018.asyncgenerator.d.ts | 2 +-
 src/lib/es2018.asynciterable.d.ts  | 4 ++++
 2 files changed, 5 insertions(+), 1 deletion(-)

diff --git a/src/lib/es2018.asyncgenerator.d.ts b/src/lib/es2018.asyncgenerator.d.ts
index f6966264c8be4..6e3f8aacc4daf 100644
--- a/src/lib/es2018.asyncgenerator.d.ts
+++ b/src/lib/es2018.asyncgenerator.d.ts
@@ -1,6 +1,6 @@
 /// <reference lib="es2018.asynciterable" />
 
-interface AsyncGenerator<T = unknown, TReturn = any, TNext = unknown> extends AsyncIterator<T, TReturn, TNext> {
+interface AsyncGenerator<T = unknown, TReturn = any, TNext = unknown> extends AsyncBuiltinIterator<T, TReturn, TNext> {
     // NOTE: 'next' is defined using a tuple to ensure we report the correct assignability errors in all places.
     next(...args: [] | [TNext]): Promise<IteratorResult<T, TReturn>>;
     return(value: TReturn | PromiseLike<TReturn>): Promise<IteratorResult<T, TReturn>>;
diff --git a/src/lib/es2018.asynciterable.d.ts b/src/lib/es2018.asynciterable.d.ts
index 0fe799e21055e..89248f77a0171 100644
--- a/src/lib/es2018.asynciterable.d.ts
+++ b/src/lib/es2018.asynciterable.d.ts
@@ -16,6 +16,10 @@ interface AsyncIterator<T, TReturn = any, TNext = undefined> {
     throw?(e?: any): Promise<IteratorResult<T, TReturn>>;
 }
 
+interface AsyncBuiltinIterator<T, TReturn = void, TNext = undefined> extends AsyncIterator<T, TReturn, TNext> {
+    [Symbol.asyncIterator](): AsyncBuiltinIterator<T, TReturn, TNext>;
+}
+
 interface AsyncIterable<T> {
     [Symbol.asyncIterator](): AsyncIterator<T>;
 }

From e74815847fa47181f5621bf7257abe0f9fc7f64b Mon Sep 17 00:00:00 2001
From: Kevin Gibbons <bakkot@gmail.com>
Date: Wed, 17 Apr 2024 16:51:15 -0700
Subject: [PATCH 7/9] rebaseline

---
 .../reference/YieldStarExpression4_es6.types  |  3 +-
 .../argumentsObjectIterator02_ES6.types       | 16 +++----
 tests/baselines/reference/arrayFrom.types     | 24 +++++------
 .../reference/bigintWithLib.errors.txt        |  4 +-
 .../conditionalTypeDoesntSpinForever.types    |  4 +-
 .../dependentDestructuredVariables.types      |  2 +-
 ...ructuredLateBoundNameHasCorrectTypes.types |  8 ++--
 .../dissallowSymbolAsWeakType.errors.txt      |  8 ++--
 ....asyncGenerators.classMethods.es2015.types |  6 ++-
 ....asyncGenerators.classMethods.es2018.types |  6 ++-
 ...ter.asyncGenerators.classMethods.es5.types |  6 ++-
 ...nerators.functionDeclarations.es2015.types |  6 ++-
 ...nerators.functionDeclarations.es2018.types |  6 ++-
 ...cGenerators.functionDeclarations.es5.types |  6 ++-
 ...enerators.functionExpressions.es2015.types |  6 ++-
 ...enerators.functionExpressions.es2018.types |  6 ++-
 ...ncGenerators.functionExpressions.es5.types |  6 ++-
 ...nerators.objectLiteralMethods.es2015.types |  6 ++-
 ...nerators.objectLiteralMethods.es2018.types |  6 ++-
 ...cGenerators.objectLiteralMethods.es5.types |  6 ++-
 tests/baselines/reference/for-of12.types      | 12 +++---
 tests/baselines/reference/for-of13.types      | 12 +++---
 tests/baselines/reference/for-of39.errors.txt |  4 +-
 .../generatorReturnTypeInference.types        |  4 +-
 ...eneratorReturnTypeInferenceNonStrict.types |  4 +-
 .../reference/generatorTypeCheck19.types      |  3 +-
 .../reference/generatorTypeCheck20.types      |  4 +-
 .../reference/generatorTypeCheck22.types      |  6 ++-
 .../reference/generatorTypeCheck23.types      |  6 ++-
 .../reference/generatorTypeCheck24.types      |  9 ++--
 .../reference/generatorTypeCheck25.types      |  8 ++--
 .../reference/generatorTypeCheck26.types      |  3 +-
 .../reference/generatorTypeCheck53.types      |  3 +-
 .../reference/generatorTypeCheck54.types      |  6 ++-
 ...rtHelpersNoHelpersForAsyncGenerators.types |  4 +-
 ...indirectGlobalSymbolPartOfObjectType.types |  4 +-
 ...inferFromGenericFunctionReturnTypes3.types |  3 ++
 .../iterableArrayPattern28.errors.txt         |  4 +-
 ...ithAsClauseAndLateBoundProperty.errors.txt |  4 +-
 ...TypeWithAsClauseAndLateBoundProperty.types | 12 +++---
 ...edTypeWithAsClauseAndLateBoundProperty2.js | 16 +++----
 ...ypeWithAsClauseAndLateBoundProperty2.types | 12 +++---
 ...eLibrary_NoErrorDuplicateLibOptions1.types | 12 +++---
 ...eLibrary_NoErrorDuplicateLibOptions2.types | 12 +++---
 ...dularizeLibrary_TargetES5UsingES6Lib.types | 12 +++---
 ...dularizeLibrary_TargetES6UsingES6Lib.types | 12 +++---
 ....asyncGenerators.classMethods.es2018.types |  4 +-
 ...nerators.functionDeclarations.es2018.types |  4 +-
 ...enerators.functionExpressions.es2018.types |  4 +-
 ...nerators.objectLiteralMethods.es2018.types |  4 +-
 .../reference/regexMatchAll-esnext.types      | 16 +++----
 tests/baselines/reference/regexMatchAll.types | 16 +++----
 .../baselines/reference/stringMatchAll.types  | 20 ++++-----
 .../types.asyncGenerators.es2018.1.types      | 42 ++++++++++++-------
 .../types.asyncGenerators.es2018.2.types      | 24 +++++------
 .../yieldExpressionInControlFlow.errors.txt   |  5 ++-
 .../yieldExpressionInControlFlow.types        | 16 +++----
 .../yieldExpressionInnerCommentEmit.types     |  6 ++-
 58 files changed, 276 insertions(+), 217 deletions(-)

diff --git a/tests/baselines/reference/YieldStarExpression4_es6.types b/tests/baselines/reference/YieldStarExpression4_es6.types
index 5a84b1bba080b..e2bec7220b371 100644
--- a/tests/baselines/reference/YieldStarExpression4_es6.types
+++ b/tests/baselines/reference/YieldStarExpression4_es6.types
@@ -6,7 +6,8 @@ function *g() {
 >  : ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
     yield * [];
->yield * [] : any
+>yield * [] : void
+>           : ^^^^
 >[] : undefined[]
 >   : ^^^^^^^^^^^
 }
diff --git a/tests/baselines/reference/argumentsObjectIterator02_ES6.types b/tests/baselines/reference/argumentsObjectIterator02_ES6.types
index 6c5b5eb104576..f690ea9c58855 100644
--- a/tests/baselines/reference/argumentsObjectIterator02_ES6.types
+++ b/tests/baselines/reference/argumentsObjectIterator02_ES6.types
@@ -12,10 +12,10 @@ function doubleAndReturnAsArray(x: number, y: number, z: number): [number, numbe
 >  : ^^^^^^
 
     let blah = arguments[Symbol.iterator];
->blah : () => IterableIterator<any>
->     : ^^^^^^^^^^^^^^^^^^^^^^^^^^^
->arguments[Symbol.iterator] : () => IterableIterator<any>
->                           :                            
+>blah : () => BuiltinIterator<any, void, undefined>
+>     : ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+>arguments[Symbol.iterator] : () => BuiltinIterator<any, void, undefined>
+>                           :                                            
 >arguments : IArguments
 >          : ^^^^^^^^^^
 >Symbol.iterator : unique symbol
@@ -33,10 +33,10 @@ function doubleAndReturnAsArray(x: number, y: number, z: number): [number, numbe
 
     for (let arg of blah()) {
 >arg : any
->blah() : IterableIterator<any>
->       : ^^^^^^^^^^^^^^^^^^^^^
->blah : () => IterableIterator<any>
->     : ^^^^^^^^^^^^^^^^^^^^^^^^^^^
+>blah() : BuiltinIterator<any, void, undefined>
+>       : ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+>blah : () => BuiltinIterator<any, void, undefined>
+>     : ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
         result.push(arg + arg);
 >result.push(arg + arg) : number
diff --git a/tests/baselines/reference/arrayFrom.types b/tests/baselines/reference/arrayFrom.types
index 71485e09f6925..8df2e79d1d5cb 100644
--- a/tests/baselines/reference/arrayFrom.types
+++ b/tests/baselines/reference/arrayFrom.types
@@ -83,14 +83,14 @@ const result2: A[] = Array.from(inputA.values());
 >      : ^^^^^^^^^^^^^^^^
 >from : { <T>(arrayLike: ArrayLike<T>): T[]; <T_1, U>(arrayLike: ArrayLike<T_1>, mapfn: (v: T_1, k: number) => U, thisArg?: any): U[]; <T_2>(iterable: Iterable<T_2> | ArrayLike<T_2>): T_2[]; <T_3, U_1>(iterable: Iterable<T_3> | ArrayLike<T_3>, mapfn: (v: T_3, k: number) => U_1, thisArg?: any): U_1[]; }
 >     : ^^^ ^^         ^^            ^^^^^^^^^   ^^ ^^         ^^              ^^     ^^                        ^^       ^^^   ^^^^^^^^^   ^^        ^^                              ^^^^^^^^^^^   ^^   ^^        ^^                              ^^     ^^                          ^^       ^^^   ^^^^^^^^^^^
->inputA.values() : IterableIterator<A>
->                : ^^^^^^^^^^^^^^^^^^^
->inputA.values : () => IterableIterator<A>
->              : ^^^^^^^^^^^^^^^^^^^^^^^^^
+>inputA.values() : BuiltinIterator<A, void, undefined>
+>                : ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+>inputA.values : () => BuiltinIterator<A, void, undefined>
+>              : ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 >inputA : A[]
 >       : ^^^
->values : () => IterableIterator<A>
->       : ^^^^^^^^^^^^^^^^^^^^^^^^^
+>values : () => BuiltinIterator<A, void, undefined>
+>       : ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
 const result3: B[] = Array.from(inputA.values()); // expect error
 >result3 : B[]
@@ -103,14 +103,14 @@ const result3: B[] = Array.from(inputA.values()); // expect error
 >      : ^^^^^^^^^^^^^^^^
 >from : { <T>(arrayLike: ArrayLike<T>): T[]; <T_1, U>(arrayLike: ArrayLike<T_1>, mapfn: (v: T_1, k: number) => U, thisArg?: any): U[]; <T_2>(iterable: Iterable<T_2> | ArrayLike<T_2>): T_2[]; <T_3, U_1>(iterable: Iterable<T_3> | ArrayLike<T_3>, mapfn: (v: T_3, k: number) => U_1, thisArg?: any): U_1[]; }
 >     : ^^^ ^^         ^^            ^^^^^^^^^   ^^ ^^         ^^              ^^     ^^                        ^^       ^^^   ^^^^^^^^^   ^^        ^^                              ^^^^^^^^^^^   ^^   ^^        ^^                              ^^     ^^                          ^^       ^^^   ^^^^^^^^^^^
->inputA.values() : IterableIterator<A>
->                : ^^^^^^^^^^^^^^^^^^^
->inputA.values : () => IterableIterator<A>
->              : ^^^^^^^^^^^^^^^^^^^^^^^^^
+>inputA.values() : BuiltinIterator<A, void, undefined>
+>                : ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+>inputA.values : () => BuiltinIterator<A, void, undefined>
+>              : ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 >inputA : A[]
 >       : ^^^
->values : () => IterableIterator<A>
->       : ^^^^^^^^^^^^^^^^^^^^^^^^^
+>values : () => BuiltinIterator<A, void, undefined>
+>       : ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
 const result4: A[] = Array.from(inputB, ({ b }): A => ({ a: b }));
 >result4 : A[]
diff --git a/tests/baselines/reference/bigintWithLib.errors.txt b/tests/baselines/reference/bigintWithLib.errors.txt
index aa402ec0cba5c..523b1b3732f17 100644
--- a/tests/baselines/reference/bigintWithLib.errors.txt
+++ b/tests/baselines/reference/bigintWithLib.errors.txt
@@ -5,7 +5,7 @@ bigintWithLib.ts(19,33): error TS2769: No overload matches this call.
   Overload 2 of 3, '(array: Iterable<bigint>): BigInt64Array', gave the following error.
     Argument of type 'number[]' is not assignable to parameter of type 'Iterable<bigint>'.
       The types returned by '[Symbol.iterator]().next(...)' are incompatible between these types.
-        Type 'IteratorResult<number, any>' is not assignable to type 'IteratorResult<bigint, any>'.
+        Type 'IteratorResult<number, void>' is not assignable to type 'IteratorResult<bigint, any>'.
           Type 'IteratorYieldResult<number>' is not assignable to type 'IteratorResult<bigint, any>'.
             Type 'IteratorYieldResult<number>' is not assignable to type 'IteratorYieldResult<bigint>'.
               Type 'number' is not assignable to type 'bigint'.
@@ -54,7 +54,7 @@ bigintWithLib.ts(46,26): error TS2345: Argument of type 'number' is not assignab
 !!! error TS2769:   Overload 2 of 3, '(array: Iterable<bigint>): BigInt64Array', gave the following error.
 !!! error TS2769:     Argument of type 'number[]' is not assignable to parameter of type 'Iterable<bigint>'.
 !!! error TS2769:       The types returned by '[Symbol.iterator]().next(...)' are incompatible between these types.
-!!! error TS2769:         Type 'IteratorResult<number, any>' is not assignable to type 'IteratorResult<bigint, any>'.
+!!! error TS2769:         Type 'IteratorResult<number, void>' is not assignable to type 'IteratorResult<bigint, any>'.
 !!! error TS2769:           Type 'IteratorYieldResult<number>' is not assignable to type 'IteratorResult<bigint, any>'.
 !!! error TS2769:             Type 'IteratorYieldResult<number>' is not assignable to type 'IteratorYieldResult<bigint>'.
 !!! error TS2769:               Type 'number' is not assignable to type 'bigint'.
diff --git a/tests/baselines/reference/conditionalTypeDoesntSpinForever.types b/tests/baselines/reference/conditionalTypeDoesntSpinForever.types
index 455503c76f0f4..339af3affceee 100644
--- a/tests/baselines/reference/conditionalTypeDoesntSpinForever.types
+++ b/tests/baselines/reference/conditionalTypeDoesntSpinForever.types
@@ -1,8 +1,8 @@
 //// [tests/cases/compiler/conditionalTypeDoesntSpinForever.ts] ////
 
 === Performance Stats ===
-Type Count: 1,000
-Instantiation count: 2,500 -> 5,000
+Type Count: 1,000 -> 2,500
+Instantiation count: 5,000
 
 === conditionalTypeDoesntSpinForever.ts ===
 // A *self-contained* demonstration of the problem follows...
diff --git a/tests/baselines/reference/dependentDestructuredVariables.types b/tests/baselines/reference/dependentDestructuredVariables.types
index 9591df821a053..23830ab53191b 100644
--- a/tests/baselines/reference/dependentDestructuredVariables.types
+++ b/tests/baselines/reference/dependentDestructuredVariables.types
@@ -2,7 +2,7 @@
 
 === Performance Stats ===
 Type Count: 2,500
-Instantiation count: 1,000
+Instantiation count: 2,500
 
 === dependentDestructuredVariables.ts ===
 type Action =
diff --git a/tests/baselines/reference/destructuredLateBoundNameHasCorrectTypes.types b/tests/baselines/reference/destructuredLateBoundNameHasCorrectTypes.types
index 9c15d6b2b210d..a7a72d36c5b53 100644
--- a/tests/baselines/reference/destructuredLateBoundNameHasCorrectTypes.types
+++ b/tests/baselines/reference/destructuredLateBoundNameHasCorrectTypes.types
@@ -8,16 +8,16 @@ let { [Symbol.iterator]: destructured } = [];
 >       : ^^^^^^^^^^^^^^^^^
 >iterator : unique symbol
 >         : ^^^^^^^^^^^^^
->destructured : () => IterableIterator<undefined>
->             : ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+>destructured : () => BuiltinIterator<undefined, void, undefined>
+>             : ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 >[] : undefined[]
 >   : ^^^^^^^^^^^
 
 void destructured;
 >void destructured : undefined
 >                  : ^^^^^^^^^
->destructured : () => IterableIterator<undefined>
->             : ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+>destructured : () => BuiltinIterator<undefined, void, undefined>
+>             : ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
 const named = "prop";
 >named : "prop"
diff --git a/tests/baselines/reference/dissallowSymbolAsWeakType.errors.txt b/tests/baselines/reference/dissallowSymbolAsWeakType.errors.txt
index 67c78efa8cc8d..d8ab56f26c568 100644
--- a/tests/baselines/reference/dissallowSymbolAsWeakType.errors.txt
+++ b/tests/baselines/reference/dissallowSymbolAsWeakType.errors.txt
@@ -2,7 +2,7 @@ dissallowSymbolAsWeakType.ts(3,16): error TS2769: No overload matches this call.
   Overload 1 of 2, '(iterable: Iterable<object>): WeakSet<object>', gave the following error.
     Argument of type 'symbol[]' is not assignable to parameter of type 'Iterable<object>'.
       The types returned by '[Symbol.iterator]().next(...)' are incompatible between these types.
-        Type 'IteratorResult<symbol, any>' is not assignable to type 'IteratorResult<object, any>'.
+        Type 'IteratorResult<symbol, void>' is not assignable to type 'IteratorResult<object, any>'.
           Type 'IteratorYieldResult<symbol>' is not assignable to type 'IteratorResult<object, any>'.
             Type 'IteratorYieldResult<symbol>' is not assignable to type 'IteratorYieldResult<object>'.
               Type 'symbol' is not assignable to type 'object'.
@@ -15,7 +15,7 @@ dissallowSymbolAsWeakType.ts(8,16): error TS2769: No overload matches this call.
   Overload 1 of 2, '(iterable: Iterable<readonly [object, boolean]>): WeakMap<object, boolean>', gave the following error.
     Argument of type '[symbol, false][]' is not assignable to parameter of type 'Iterable<readonly [object, boolean]>'.
       The types returned by '[Symbol.iterator]().next(...)' are incompatible between these types.
-        Type 'IteratorResult<[symbol, false], any>' is not assignable to type 'IteratorResult<readonly [object, boolean], any>'.
+        Type 'IteratorResult<[symbol, false], void>' is not assignable to type 'IteratorResult<readonly [object, boolean], any>'.
           Type 'IteratorYieldResult<[symbol, false]>' is not assignable to type 'IteratorResult<readonly [object, boolean], any>'.
             Type 'IteratorYieldResult<[symbol, false]>' is not assignable to type 'IteratorYieldResult<readonly [object, boolean]>'.
               Type '[symbol, false]' is not assignable to type 'readonly [object, boolean]'.
@@ -41,7 +41,7 @@ dissallowSymbolAsWeakType.ts(19,14): error TS2345: Argument of type 'symbol' is
 !!! error TS2769:   Overload 1 of 2, '(iterable: Iterable<object>): WeakSet<object>', gave the following error.
 !!! error TS2769:     Argument of type 'symbol[]' is not assignable to parameter of type 'Iterable<object>'.
 !!! error TS2769:       The types returned by '[Symbol.iterator]().next(...)' are incompatible between these types.
-!!! error TS2769:         Type 'IteratorResult<symbol, any>' is not assignable to type 'IteratorResult<object, any>'.
+!!! error TS2769:         Type 'IteratorResult<symbol, void>' is not assignable to type 'IteratorResult<object, any>'.
 !!! error TS2769:           Type 'IteratorYieldResult<symbol>' is not assignable to type 'IteratorResult<object, any>'.
 !!! error TS2769:             Type 'IteratorYieldResult<symbol>' is not assignable to type 'IteratorYieldResult<object>'.
 !!! error TS2769:               Type 'symbol' is not assignable to type 'object'.
@@ -63,7 +63,7 @@ dissallowSymbolAsWeakType.ts(19,14): error TS2345: Argument of type 'symbol' is
 !!! error TS2769:   Overload 1 of 2, '(iterable: Iterable<readonly [object, boolean]>): WeakMap<object, boolean>', gave the following error.
 !!! error TS2769:     Argument of type '[symbol, false][]' is not assignable to parameter of type 'Iterable<readonly [object, boolean]>'.
 !!! error TS2769:       The types returned by '[Symbol.iterator]().next(...)' are incompatible between these types.
-!!! error TS2769:         Type 'IteratorResult<[symbol, false], any>' is not assignable to type 'IteratorResult<readonly [object, boolean], any>'.
+!!! error TS2769:         Type 'IteratorResult<[symbol, false], void>' is not assignable to type 'IteratorResult<readonly [object, boolean], any>'.
 !!! error TS2769:           Type 'IteratorYieldResult<[symbol, false]>' is not assignable to type 'IteratorResult<readonly [object, boolean], any>'.
 !!! error TS2769:             Type 'IteratorYieldResult<[symbol, false]>' is not assignable to type 'IteratorYieldResult<readonly [object, boolean]>'.
 !!! error TS2769:               Type '[symbol, false]' is not assignable to type 'readonly [object, boolean]'.
diff --git a/tests/baselines/reference/emitter.asyncGenerators.classMethods.es2015.types b/tests/baselines/reference/emitter.asyncGenerators.classMethods.es2015.types
index 4cc15fc48eeda..05be50b5d104e 100644
--- a/tests/baselines/reference/emitter.asyncGenerators.classMethods.es2015.types
+++ b/tests/baselines/reference/emitter.asyncGenerators.classMethods.es2015.types
@@ -50,8 +50,10 @@ class C4 {
 >  : ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
         const x = yield* [1];
->x : any
->yield* [1] : any
+>x : void
+>  : ^^^^
+>yield* [1] : void
+>           : ^^^^
 >[1] : number[]
 >    : ^^^^^^^^
 >1 : 1
diff --git a/tests/baselines/reference/emitter.asyncGenerators.classMethods.es2018.types b/tests/baselines/reference/emitter.asyncGenerators.classMethods.es2018.types
index 754591d94ba1f..25102c916d890 100644
--- a/tests/baselines/reference/emitter.asyncGenerators.classMethods.es2018.types
+++ b/tests/baselines/reference/emitter.asyncGenerators.classMethods.es2018.types
@@ -50,8 +50,10 @@ class C4 {
 >  : ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
         const x = yield* [1];
->x : any
->yield* [1] : any
+>x : void
+>  : ^^^^
+>yield* [1] : void
+>           : ^^^^
 >[1] : number[]
 >    : ^^^^^^^^
 >1 : 1
diff --git a/tests/baselines/reference/emitter.asyncGenerators.classMethods.es5.types b/tests/baselines/reference/emitter.asyncGenerators.classMethods.es5.types
index aa7bf57541199..71f69104f4972 100644
--- a/tests/baselines/reference/emitter.asyncGenerators.classMethods.es5.types
+++ b/tests/baselines/reference/emitter.asyncGenerators.classMethods.es5.types
@@ -50,8 +50,10 @@ class C4 {
 >  : ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
         const x = yield* [1];
->x : any
->yield* [1] : any
+>x : void
+>  : ^^^^
+>yield* [1] : void
+>           : ^^^^
 >[1] : number[]
 >    : ^^^^^^^^
 >1 : 1
diff --git a/tests/baselines/reference/emitter.asyncGenerators.functionDeclarations.es2015.types b/tests/baselines/reference/emitter.asyncGenerators.functionDeclarations.es2015.types
index bfbf793fc22ca..4cacea0078245 100644
--- a/tests/baselines/reference/emitter.asyncGenerators.functionDeclarations.es2015.types
+++ b/tests/baselines/reference/emitter.asyncGenerators.functionDeclarations.es2015.types
@@ -31,8 +31,10 @@ async function * f4() {
 >   : ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
     const x = yield* [1];
->x : any
->yield* [1] : any
+>x : void
+>  : ^^^^
+>yield* [1] : void
+>           : ^^^^
 >[1] : number[]
 >    : ^^^^^^^^
 >1 : 1
diff --git a/tests/baselines/reference/emitter.asyncGenerators.functionDeclarations.es2018.types b/tests/baselines/reference/emitter.asyncGenerators.functionDeclarations.es2018.types
index f44884810ae8c..4462bcb0ef7c5 100644
--- a/tests/baselines/reference/emitter.asyncGenerators.functionDeclarations.es2018.types
+++ b/tests/baselines/reference/emitter.asyncGenerators.functionDeclarations.es2018.types
@@ -31,8 +31,10 @@ async function * f4() {
 >   : ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
     const x = yield* [1];
->x : any
->yield* [1] : any
+>x : void
+>  : ^^^^
+>yield* [1] : void
+>           : ^^^^
 >[1] : number[]
 >    : ^^^^^^^^
 >1 : 1
diff --git a/tests/baselines/reference/emitter.asyncGenerators.functionDeclarations.es5.types b/tests/baselines/reference/emitter.asyncGenerators.functionDeclarations.es5.types
index d542e9bd52aaa..a10e8678efd7e 100644
--- a/tests/baselines/reference/emitter.asyncGenerators.functionDeclarations.es5.types
+++ b/tests/baselines/reference/emitter.asyncGenerators.functionDeclarations.es5.types
@@ -31,8 +31,10 @@ async function * f4() {
 >   : ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
     const x = yield* [1];
->x : any
->yield* [1] : any
+>x : void
+>  : ^^^^
+>yield* [1] : void
+>           : ^^^^
 >[1] : number[]
 >    : ^^^^^^^^
 >1 : 1
diff --git a/tests/baselines/reference/emitter.asyncGenerators.functionExpressions.es2015.types b/tests/baselines/reference/emitter.asyncGenerators.functionExpressions.es2015.types
index 665826058f73f..04b864543c8ef 100644
--- a/tests/baselines/reference/emitter.asyncGenerators.functionExpressions.es2015.types
+++ b/tests/baselines/reference/emitter.asyncGenerators.functionExpressions.es2015.types
@@ -39,8 +39,10 @@ const f4 = async function * () {
 >                                                :                                              
 
     const x = yield* [1];
->x : any
->yield* [1] : any
+>x : void
+>  : ^^^^
+>yield* [1] : void
+>           : ^^^^
 >[1] : number[]
 >    : ^^^^^^^^
 >1 : 1
diff --git a/tests/baselines/reference/emitter.asyncGenerators.functionExpressions.es2018.types b/tests/baselines/reference/emitter.asyncGenerators.functionExpressions.es2018.types
index d6b63844845cd..1fea158b4c016 100644
--- a/tests/baselines/reference/emitter.asyncGenerators.functionExpressions.es2018.types
+++ b/tests/baselines/reference/emitter.asyncGenerators.functionExpressions.es2018.types
@@ -39,8 +39,10 @@ const f4 = async function * () {
 >                                                :                                              
 
     const x = yield* [1];
->x : any
->yield* [1] : any
+>x : void
+>  : ^^^^
+>yield* [1] : void
+>           : ^^^^
 >[1] : number[]
 >    : ^^^^^^^^
 >1 : 1
diff --git a/tests/baselines/reference/emitter.asyncGenerators.functionExpressions.es5.types b/tests/baselines/reference/emitter.asyncGenerators.functionExpressions.es5.types
index c48d1323cae7f..f514a371a2893 100644
--- a/tests/baselines/reference/emitter.asyncGenerators.functionExpressions.es5.types
+++ b/tests/baselines/reference/emitter.asyncGenerators.functionExpressions.es5.types
@@ -39,8 +39,10 @@ const f4 = async function * () {
 >                                                :                                              
 
     const x = yield* [1];
->x : any
->yield* [1] : any
+>x : void
+>  : ^^^^
+>yield* [1] : void
+>           : ^^^^
 >[1] : number[]
 >    : ^^^^^^^^
 >1 : 1
diff --git a/tests/baselines/reference/emitter.asyncGenerators.objectLiteralMethods.es2015.types b/tests/baselines/reference/emitter.asyncGenerators.objectLiteralMethods.es2015.types
index 604560f8a9d1f..4185b4d15a0d3 100644
--- a/tests/baselines/reference/emitter.asyncGenerators.objectLiteralMethods.es2015.types
+++ b/tests/baselines/reference/emitter.asyncGenerators.objectLiteralMethods.es2015.types
@@ -58,8 +58,10 @@ const o4 = {
 >  : ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
         const x = yield* [1];
->x : any
->yield* [1] : any
+>x : void
+>  : ^^^^
+>yield* [1] : void
+>           : ^^^^
 >[1] : number[]
 >    : ^^^^^^^^
 >1 : 1
diff --git a/tests/baselines/reference/emitter.asyncGenerators.objectLiteralMethods.es2018.types b/tests/baselines/reference/emitter.asyncGenerators.objectLiteralMethods.es2018.types
index ead1acd6ef0d9..5cc5d052f8454 100644
--- a/tests/baselines/reference/emitter.asyncGenerators.objectLiteralMethods.es2018.types
+++ b/tests/baselines/reference/emitter.asyncGenerators.objectLiteralMethods.es2018.types
@@ -58,8 +58,10 @@ const o4 = {
 >  : ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
         const x = yield* [1];
->x : any
->yield* [1] : any
+>x : void
+>  : ^^^^
+>yield* [1] : void
+>           : ^^^^
 >[1] : number[]
 >    : ^^^^^^^^
 >1 : 1
diff --git a/tests/baselines/reference/emitter.asyncGenerators.objectLiteralMethods.es5.types b/tests/baselines/reference/emitter.asyncGenerators.objectLiteralMethods.es5.types
index c362f7b952b98..9e2a72b4bcb48 100644
--- a/tests/baselines/reference/emitter.asyncGenerators.objectLiteralMethods.es5.types
+++ b/tests/baselines/reference/emitter.asyncGenerators.objectLiteralMethods.es5.types
@@ -58,8 +58,10 @@ const o4 = {
 >  : ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
         const x = yield* [1];
->x : any
->yield* [1] : any
+>x : void
+>  : ^^^^
+>yield* [1] : void
+>           : ^^^^
 >[1] : number[]
 >    : ^^^^^^^^
 >1 : 1
diff --git a/tests/baselines/reference/for-of12.types b/tests/baselines/reference/for-of12.types
index 24c0ba69b975a..d159821984958 100644
--- a/tests/baselines/reference/for-of12.types
+++ b/tests/baselines/reference/for-of12.types
@@ -8,16 +8,16 @@ var v: string;
 for (v of [0, ""].values()) { }
 >v : string
 >  : ^^^^^^
->[0, ""].values() : IterableIterator<string | number>
->                 : ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
->[0, ""].values : () => IterableIterator<string | number>
->               : ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+>[0, ""].values() : BuiltinIterator<string | number, void, undefined>
+>                 : ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+>[0, ""].values : () => BuiltinIterator<string | number, void, undefined>
+>               : ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 >[0, ""] : (string | number)[]
 >        : ^^^^^^^^^^^^^^^^^^^
 >0 : 0
 >  : ^
 >"" : ""
 >   : ^^
->values : () => IterableIterator<string | number>
->       : ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+>values : () => BuiltinIterator<string | number, void, undefined>
+>       : ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
diff --git a/tests/baselines/reference/for-of13.types b/tests/baselines/reference/for-of13.types
index 6bfdc1fe849eb..bfb630ddb2eb5 100644
--- a/tests/baselines/reference/for-of13.types
+++ b/tests/baselines/reference/for-of13.types
@@ -8,14 +8,14 @@ var v: string;
 for (v of [""].values()) { }
 >v : string
 >  : ^^^^^^
->[""].values() : IterableIterator<string>
->              : ^^^^^^^^^^^^^^^^^^^^^^^^
->[""].values : () => IterableIterator<string>
->            : ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+>[""].values() : BuiltinIterator<string, void, undefined>
+>              : ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+>[""].values : () => BuiltinIterator<string, void, undefined>
+>            : ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 >[""] : string[]
 >     : ^^^^^^^^
 >"" : ""
 >   : ^^
->values : () => IterableIterator<string>
->       : ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+>values : () => BuiltinIterator<string, void, undefined>
+>       : ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
diff --git a/tests/baselines/reference/for-of39.errors.txt b/tests/baselines/reference/for-of39.errors.txt
index a59cb07da6bcc..bb44b41b7090c 100644
--- a/tests/baselines/reference/for-of39.errors.txt
+++ b/tests/baselines/reference/for-of39.errors.txt
@@ -2,7 +2,7 @@ for-of39.ts(1,15): error TS2769: No overload matches this call.
   Overload 1 of 4, '(iterable?: Iterable<readonly [string, boolean]>): Map<string, boolean>', gave the following error.
     Argument of type '([string, number] | [string, true])[]' is not assignable to parameter of type 'Iterable<readonly [string, boolean]>'.
       The types returned by '[Symbol.iterator]().next(...)' are incompatible between these types.
-        Type 'IteratorResult<[string, number] | [string, true], any>' is not assignable to type 'IteratorResult<readonly [string, boolean], any>'.
+        Type 'IteratorResult<[string, number] | [string, true], void>' is not assignable to type 'IteratorResult<readonly [string, boolean], any>'.
           Type 'IteratorYieldResult<[string, number] | [string, true]>' is not assignable to type 'IteratorResult<readonly [string, boolean], any>'.
             Type 'IteratorYieldResult<[string, number] | [string, true]>' is not assignable to type 'IteratorYieldResult<readonly [string, boolean]>'.
               Type '[string, number] | [string, true]' is not assignable to type 'readonly [string, boolean]'.
@@ -20,7 +20,7 @@ for-of39.ts(1,15): error TS2769: No overload matches this call.
 !!! error TS2769:   Overload 1 of 4, '(iterable?: Iterable<readonly [string, boolean]>): Map<string, boolean>', gave the following error.
 !!! error TS2769:     Argument of type '([string, number] | [string, true])[]' is not assignable to parameter of type 'Iterable<readonly [string, boolean]>'.
 !!! error TS2769:       The types returned by '[Symbol.iterator]().next(...)' are incompatible between these types.
-!!! error TS2769:         Type 'IteratorResult<[string, number] | [string, true], any>' is not assignable to type 'IteratorResult<readonly [string, boolean], any>'.
+!!! error TS2769:         Type 'IteratorResult<[string, number] | [string, true], void>' is not assignable to type 'IteratorResult<readonly [string, boolean], any>'.
 !!! error TS2769:           Type 'IteratorYieldResult<[string, number] | [string, true]>' is not assignable to type 'IteratorResult<readonly [string, boolean], any>'.
 !!! error TS2769:             Type 'IteratorYieldResult<[string, number] | [string, true]>' is not assignable to type 'IteratorYieldResult<readonly [string, boolean]>'.
 !!! error TS2769:               Type '[string, number] | [string, true]' is not assignable to type 'readonly [string, boolean]'.
diff --git a/tests/baselines/reference/generatorReturnTypeInference.types b/tests/baselines/reference/generatorReturnTypeInference.types
index fd2d5f7605ec1..5fe60b9e0e0a6 100644
--- a/tests/baselines/reference/generatorReturnTypeInference.types
+++ b/tests/baselines/reference/generatorReturnTypeInference.types
@@ -44,8 +44,8 @@ function* g003() { // Generator<never, void, undefined>
 >     : ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
     yield* [];
->yield* [] : any
->          : ^^^
+>yield* [] : void
+>          : ^^^^
 >[] : never[]
 >   : ^^^^^^^
 }
diff --git a/tests/baselines/reference/generatorReturnTypeInferenceNonStrict.types b/tests/baselines/reference/generatorReturnTypeInferenceNonStrict.types
index c25395cf7f031..6b2316389e99a 100644
--- a/tests/baselines/reference/generatorReturnTypeInferenceNonStrict.types
+++ b/tests/baselines/reference/generatorReturnTypeInferenceNonStrict.types
@@ -46,8 +46,8 @@ function* g003() { // Generator<any (implicit), void, unknown>
     // NOTE: In strict mode, `[]` produces the type `never[]`.
     //       In non-strict mode, `[]` produces the type `undefined[]` which is implicitly any.
     yield* [];
->yield* [] : any
->          : ^^^
+>yield* [] : void
+>          : ^^^^
 >[] : undefined[]
 >   : ^^^^^^^^^^^
 }
diff --git a/tests/baselines/reference/generatorTypeCheck19.types b/tests/baselines/reference/generatorTypeCheck19.types
index 9faf23c7ad3ce..51bd31421b90d 100644
--- a/tests/baselines/reference/generatorTypeCheck19.types
+++ b/tests/baselines/reference/generatorTypeCheck19.types
@@ -24,7 +24,8 @@ function* g(): IterableIterator<Foo> {
 >      : ^^^^^^^^^
 
     yield * [new Bar];
->yield * [new Bar] : any
+>yield * [new Bar] : void
+>                  : ^^^^
 >[new Bar] : Bar[]
 >          : ^^^^^
 >new Bar : Bar
diff --git a/tests/baselines/reference/generatorTypeCheck20.types b/tests/baselines/reference/generatorTypeCheck20.types
index 243a849924d61..ba12c8e0a2b09 100644
--- a/tests/baselines/reference/generatorTypeCheck20.types
+++ b/tests/baselines/reference/generatorTypeCheck20.types
@@ -22,8 +22,8 @@ function* g(): IterableIterator<Foo> {
 >      : ^^^^^^^^^
 
     yield * [new Baz];
->yield * [new Baz] : any
->                  : ^^^
+>yield * [new Baz] : void
+>                  : ^^^^
 >[new Baz] : Baz[]
 >          : ^^^^^
 >new Baz : Baz
diff --git a/tests/baselines/reference/generatorTypeCheck22.types b/tests/baselines/reference/generatorTypeCheck22.types
index 73246839319ed..ecaa0c00168e5 100644
--- a/tests/baselines/reference/generatorTypeCheck22.types
+++ b/tests/baselines/reference/generatorTypeCheck22.types
@@ -43,7 +43,8 @@ function* g3() {
 >    : ^^^^^^^^^^
 
     yield *[new Bar];
->yield *[new Bar] : any
+>yield *[new Bar] : void
+>                 : ^^^^
 >[new Bar] : Bar[]
 >          : ^^^^^
 >new Bar : Bar
@@ -52,7 +53,8 @@ function* g3() {
 >    : ^^^^^^^^^^
 
     yield *[new Baz];
->yield *[new Baz] : any
+>yield *[new Baz] : void
+>                 : ^^^^
 >[new Baz] : Baz[]
 >          : ^^^^^
 >new Baz : Baz
diff --git a/tests/baselines/reference/generatorTypeCheck23.types b/tests/baselines/reference/generatorTypeCheck23.types
index 52056e44274b5..b8ae9a477e20c 100644
--- a/tests/baselines/reference/generatorTypeCheck23.types
+++ b/tests/baselines/reference/generatorTypeCheck23.types
@@ -50,7 +50,8 @@ function* g3() {
 >    : ^^^^^^^^^^
 
     yield *[new Bar];
->yield *[new Bar] : any
+>yield *[new Bar] : void
+>                 : ^^^^
 >[new Bar] : Bar[]
 >          : ^^^^^
 >new Bar : Bar
@@ -59,7 +60,8 @@ function* g3() {
 >    : ^^^^^^^^^^
 
     yield *[new Baz];
->yield *[new Baz] : any
+>yield *[new Baz] : void
+>                 : ^^^^
 >[new Baz] : Baz[]
 >          : ^^^^^
 >new Baz : Baz
diff --git a/tests/baselines/reference/generatorTypeCheck24.types b/tests/baselines/reference/generatorTypeCheck24.types
index 0f243defbf3b6..b518a27d4fda6 100644
--- a/tests/baselines/reference/generatorTypeCheck24.types
+++ b/tests/baselines/reference/generatorTypeCheck24.types
@@ -29,7 +29,8 @@ function* g3() {
 >yield : any
 
     yield * [new Foo];
->yield * [new Foo] : any
+>yield * [new Foo] : void
+>                  : ^^^^
 >[new Foo] : Foo[]
 >          : ^^^^^
 >new Foo : Foo
@@ -52,7 +53,8 @@ function* g3() {
 >    : ^^^^^^^^^^
 
     yield *[new Bar];
->yield *[new Bar] : any
+>yield *[new Bar] : void
+>                 : ^^^^
 >[new Bar] : Bar[]
 >          : ^^^^^
 >new Bar : Bar
@@ -61,7 +63,8 @@ function* g3() {
 >    : ^^^^^^^^^^
 
     yield *[new Baz];
->yield *[new Baz] : any
+>yield *[new Baz] : void
+>                 : ^^^^
 >[new Baz] : Baz[]
 >          : ^^^^^
 >new Baz : Baz
diff --git a/tests/baselines/reference/generatorTypeCheck25.types b/tests/baselines/reference/generatorTypeCheck25.types
index 21c909b1895c5..5dc23453b96db 100644
--- a/tests/baselines/reference/generatorTypeCheck25.types
+++ b/tests/baselines/reference/generatorTypeCheck25.types
@@ -48,8 +48,8 @@ var g3: () => Iterable<Foo> = function* () {
 >    : ^^^^^^^^^^
 
     yield *[new Bar];
->yield *[new Bar] : any
->                 : ^^^
+>yield *[new Bar] : void
+>                 : ^^^^
 >[new Bar] : Bar[]
 >          : ^^^^^
 >new Bar : Bar
@@ -58,8 +58,8 @@ var g3: () => Iterable<Foo> = function* () {
 >    : ^^^^^^^^^^
 
     yield *[new Baz];
->yield *[new Baz] : any
->                 : ^^^
+>yield *[new Baz] : void
+>                 : ^^^^
 >[new Baz] : Baz[]
 >          : ^^^^^
 >new Baz : Baz
diff --git a/tests/baselines/reference/generatorTypeCheck26.types b/tests/baselines/reference/generatorTypeCheck26.types
index 013714b09580d..5db64928e97b9 100644
--- a/tests/baselines/reference/generatorTypeCheck26.types
+++ b/tests/baselines/reference/generatorTypeCheck26.types
@@ -22,7 +22,8 @@ function* g(): IterableIterator<(x: string) => number> {
 >       : ^^^^^^
 
     yield *[x => x.length];
->yield *[x => x.length] : any
+>yield *[x => x.length] : void
+>                       : ^^^^
 >[x => x.length] : ((x: string) => number)[]
 >                : ^^ ^^^^^^^^^^^^^^^^^^^^^^
 >x => x.length : (x: string) => number
diff --git a/tests/baselines/reference/generatorTypeCheck53.types b/tests/baselines/reference/generatorTypeCheck53.types
index 139ca5904a94b..6b31c88844a6d 100644
--- a/tests/baselines/reference/generatorTypeCheck53.types
+++ b/tests/baselines/reference/generatorTypeCheck53.types
@@ -25,7 +25,8 @@ function* g() {
 >    : ^^^^^^^^^^
 
     yield* [new Baz];
->yield* [new Baz] : any
+>yield* [new Baz] : void
+>                 : ^^^^
 >[new Baz] : Baz[]
 >          : ^^^^^
 >new Baz : Baz
diff --git a/tests/baselines/reference/generatorTypeCheck54.types b/tests/baselines/reference/generatorTypeCheck54.types
index 0bb7b4e37d61c..780f5dc6c7d89 100644
--- a/tests/baselines/reference/generatorTypeCheck54.types
+++ b/tests/baselines/reference/generatorTypeCheck54.types
@@ -18,7 +18,8 @@ function* g() {
 >  : ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
     yield* [new Foo];
->yield* [new Foo] : any
+>yield* [new Foo] : void
+>                 : ^^^^
 >[new Foo] : Foo[]
 >          : ^^^^^
 >new Foo : Foo
@@ -27,7 +28,8 @@ function* g() {
 >    : ^^^^^^^^^^
 
     yield* [new Baz];
->yield* [new Baz] : any
+>yield* [new Baz] : void
+>                 : ^^^^
 >[new Baz] : Baz[]
 >          : ^^^^^
 >new Baz : Baz
diff --git a/tests/baselines/reference/importHelpersNoHelpersForAsyncGenerators.types b/tests/baselines/reference/importHelpersNoHelpersForAsyncGenerators.types
index de022f3da9373..dc4db81c92a00 100644
--- a/tests/baselines/reference/importHelpersNoHelpersForAsyncGenerators.types
+++ b/tests/baselines/reference/importHelpersNoHelpersForAsyncGenerators.types
@@ -18,8 +18,8 @@ export async function * f() {
 >  : ^
 
     yield* [3];
->yield* [3] : any
->           : ^^^
+>yield* [3] : void
+>           : ^^^^
 >[3] : number[]
 >    : ^^^^^^^^
 >3 : 3
diff --git a/tests/baselines/reference/indirectGlobalSymbolPartOfObjectType.types b/tests/baselines/reference/indirectGlobalSymbolPartOfObjectType.types
index 6003f038d368e..7c05d31c9914a 100644
--- a/tests/baselines/reference/indirectGlobalSymbolPartOfObjectType.types
+++ b/tests/baselines/reference/indirectGlobalSymbolPartOfObjectType.types
@@ -13,8 +13,8 @@ const Symbol = globalThis.Symbol;
 >       : ^^^^^^^^^^^^^^^^^
 
 [][Symbol.iterator];
->[][Symbol.iterator] : () => IterableIterator<undefined>
->                    : ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+>[][Symbol.iterator] : () => BuiltinIterator<undefined, void, undefined>
+>                    : ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 >[] : undefined[]
 >   : ^^^^^^^^^^^
 >Symbol.iterator : unique symbol
diff --git a/tests/baselines/reference/inferFromGenericFunctionReturnTypes3.types b/tests/baselines/reference/inferFromGenericFunctionReturnTypes3.types
index 2403476c2be21..847f228a713ed 100644
--- a/tests/baselines/reference/inferFromGenericFunctionReturnTypes3.types
+++ b/tests/baselines/reference/inferFromGenericFunctionReturnTypes3.types
@@ -1,5 +1,8 @@
 //// [tests/cases/compiler/inferFromGenericFunctionReturnTypes3.ts] ////
 
+=== Performance Stats ===
+Type Count: 1,000
+
 === inferFromGenericFunctionReturnTypes3.ts ===
 // Repros from #5487
 
diff --git a/tests/baselines/reference/iterableArrayPattern28.errors.txt b/tests/baselines/reference/iterableArrayPattern28.errors.txt
index 2949a043fed86..b68c49d630425 100644
--- a/tests/baselines/reference/iterableArrayPattern28.errors.txt
+++ b/tests/baselines/reference/iterableArrayPattern28.errors.txt
@@ -2,7 +2,7 @@ iterableArrayPattern28.ts(2,28): error TS2769: No overload matches this call.
   Overload 1 of 4, '(iterable?: Iterable<readonly [string, number]>): Map<string, number>', gave the following error.
     Argument of type '([string, number] | [string, boolean])[]' is not assignable to parameter of type 'Iterable<readonly [string, number]>'.
       The types returned by '[Symbol.iterator]().next(...)' are incompatible between these types.
-        Type 'IteratorResult<[string, number] | [string, boolean], any>' is not assignable to type 'IteratorResult<readonly [string, number], any>'.
+        Type 'IteratorResult<[string, number] | [string, boolean], void>' is not assignable to type 'IteratorResult<readonly [string, number], any>'.
           Type 'IteratorYieldResult<[string, number] | [string, boolean]>' is not assignable to type 'IteratorResult<readonly [string, number], any>'.
             Type 'IteratorYieldResult<[string, number] | [string, boolean]>' is not assignable to type 'IteratorYieldResult<readonly [string, number]>'.
               Type '[string, number] | [string, boolean]' is not assignable to type 'readonly [string, number]'.
@@ -21,7 +21,7 @@ iterableArrayPattern28.ts(2,28): error TS2769: No overload matches this call.
 !!! error TS2769:   Overload 1 of 4, '(iterable?: Iterable<readonly [string, number]>): Map<string, number>', gave the following error.
 !!! error TS2769:     Argument of type '([string, number] | [string, boolean])[]' is not assignable to parameter of type 'Iterable<readonly [string, number]>'.
 !!! error TS2769:       The types returned by '[Symbol.iterator]().next(...)' are incompatible between these types.
-!!! error TS2769:         Type 'IteratorResult<[string, number] | [string, boolean], any>' is not assignable to type 'IteratorResult<readonly [string, number], any>'.
+!!! error TS2769:         Type 'IteratorResult<[string, number] | [string, boolean], void>' is not assignable to type 'IteratorResult<readonly [string, number], any>'.
 !!! error TS2769:           Type 'IteratorYieldResult<[string, number] | [string, boolean]>' is not assignable to type 'IteratorResult<readonly [string, number], any>'.
 !!! error TS2769:             Type 'IteratorYieldResult<[string, number] | [string, boolean]>' is not assignable to type 'IteratorYieldResult<readonly [string, number]>'.
 !!! error TS2769:               Type '[string, number] | [string, boolean]' is not assignable to type 'readonly [string, number]'.
diff --git a/tests/baselines/reference/mappedTypeWithAsClauseAndLateBoundProperty.errors.txt b/tests/baselines/reference/mappedTypeWithAsClauseAndLateBoundProperty.errors.txt
index 380aa151c2c22..727f01dfe59a4 100644
--- a/tests/baselines/reference/mappedTypeWithAsClauseAndLateBoundProperty.errors.txt
+++ b/tests/baselines/reference/mappedTypeWithAsClauseAndLateBoundProperty.errors.txt
@@ -1,4 +1,4 @@
-mappedTypeWithAsClauseAndLateBoundProperty.ts(3,1): error TS2741: Property 'length' is missing in type '{ [x: number]: number; toString: () => string; toLocaleString: { (): string; (locales: string | string[], options?: NumberFormatOptions & DateTimeFormatOptions): string; }; pop: () => number; push: (...items: number[]) => number; concat: { (...items: ConcatArray<number>[]): number[]; (...items: (number | ConcatArray<number>)[]): number[]; }; join: (separator?: string) => string; reverse: () => number[]; shift: () => number; slice: (start?: number, end?: number) => number[]; sort: (compareFn?: (a: number, b: number) => number) => number[]; splice: { (start: number, deleteCount?: number): number[]; (start: number, deleteCount: number, ...items: number[]): number[]; }; unshift: (...items: number[]) => number; indexOf: (searchElement: number, fromIndex?: number) => number; lastIndexOf: (searchElement: number, fromIndex?: number) => number; every: { <S extends number>(predicate: (value: number, index: number, array: number[]) => value is S, thisArg?: any): this is S[]; (predicate: (value: number, index: number, array: number[]) => unknown, thisArg?: any): boolean; }; some: (predicate: (value: number, index: number, array: number[]) => unknown, thisArg?: any) => boolean; forEach: (callbackfn: (value: number, index: number, array: number[]) => void, thisArg?: any) => void; map: <U>(callbackfn: (value: number, index: number, array: number[]) => U, thisArg?: any) => U[]; filter: { <S extends number>(predicate: (value: number, index: number, array: number[]) => value is S, thisArg?: any): S[]; (predicate: (value: number, index: number, array: number[]) => unknown, thisArg?: any): number[]; }; reduce: { (callbackfn: (previousValue: number, currentValue: number, currentIndex: number, array: number[]) => number): number; (callbackfn: (previousValue: number, currentValue: number, currentIndex: number, array: number[]) => number, initialValue: number): number; <U>(callbackfn: (previousValue: U, currentValue: number, currentIndex: number, array: number[]) => U, initialValue: U): U; }; reduceRight: { (callbackfn: (previousValue: number, currentValue: number, currentIndex: number, array: number[]) => number): number; (callbackfn: (previousValue: number, currentValue: number, currentIndex: number, array: number[]) => number, initialValue: number): number; <U>(callbackfn: (previousValue: U, currentValue: number, currentIndex: number, array: number[]) => U, initialValue: U): U; }; find: { <S extends number>(predicate: (value: number, index: number, obj: number[]) => value is S, thisArg?: any): S; (predicate: (value: number, index: number, obj: number[]) => unknown, thisArg?: any): number; }; findIndex: (predicate: (value: number, index: number, obj: number[]) => unknown, thisArg?: any) => number; fill: (value: number, start?: number, end?: number) => number[]; copyWithin: (target: number, start: number, end?: number) => number[]; entries: () => IterableIterator<[number, number]>; keys: () => IterableIterator<number>; values: () => IterableIterator<number>; includes: (searchElement: number, fromIndex?: number) => boolean; flatMap: <U, This = undefined>(callback: (this: This, value: number, index: number, array: number[]) => U | readonly U[], thisArg?: This) => U[]; flat: <A, D extends number = 1>(this: A, depth?: D) => FlatArray<A, D>[]; [Symbol.iterator]: () => IterableIterator<number>; readonly [Symbol.unscopables]: { [x: number]: boolean; length?: boolean; toString?: boolean; toLocaleString?: boolean; pop?: boolean; push?: boolean; concat?: boolean; join?: boolean; reverse?: boolean; shift?: boolean; slice?: boolean; sort?: boolean; splice?: boolean; unshift?: boolean; indexOf?: boolean; lastIndexOf?: boolean; every?: boolean; some?: boolean; forEach?: boolean; map?: boolean; filter?: boolean; reduce?: boolean; reduceRight?: boolean; find?: boolean; findIndex?: boolean; fill?: boolean; copyWithin?: boolean; entries?: boolean; keys?: boolean; values?: boolean; includes?: boolean; flatMap?: boolean; flat?: boolean; [Symbol.iterator]?: boolean; readonly [Symbol.unscopables]?: boolean; }; }' but required in type 'number[]'.
+mappedTypeWithAsClauseAndLateBoundProperty.ts(3,1): error TS2741: Property 'length' is missing in type '{ [x: number]: number; toString: () => string; toLocaleString: { (): string; (locales: string | string[], options?: NumberFormatOptions & DateTimeFormatOptions): string; }; pop: () => number; push: (...items: number[]) => number; concat: { (...items: ConcatArray<number>[]): number[]; (...items: (number | ConcatArray<number>)[]): number[]; }; join: (separator?: string) => string; reverse: () => number[]; shift: () => number; slice: (start?: number, end?: number) => number[]; sort: (compareFn?: (a: number, b: number) => number) => number[]; splice: { (start: number, deleteCount?: number): number[]; (start: number, deleteCount: number, ...items: number[]): number[]; }; unshift: (...items: number[]) => number; indexOf: (searchElement: number, fromIndex?: number) => number; lastIndexOf: (searchElement: number, fromIndex?: number) => number; every: { <S extends number>(predicate: (value: number, index: number, array: number[]) => value is S, thisArg?: any): this is S[]; (predicate: (value: number, index: number, array: number[]) => unknown, thisArg?: any): boolean; }; some: (predicate: (value: number, index: number, array: number[]) => unknown, thisArg?: any) => boolean; forEach: (callbackfn: (value: number, index: number, array: number[]) => void, thisArg?: any) => void; map: <U>(callbackfn: (value: number, index: number, array: number[]) => U, thisArg?: any) => U[]; filter: { <S extends number>(predicate: (value: number, index: number, array: number[]) => value is S, thisArg?: any): S[]; (predicate: (value: number, index: number, array: number[]) => unknown, thisArg?: any): number[]; }; reduce: { (callbackfn: (previousValue: number, currentValue: number, currentIndex: number, array: number[]) => number): number; (callbackfn: (previousValue: number, currentValue: number, currentIndex: number, array: number[]) => number, initialValue: number): number; <U>(callbackfn: (previousValue: U, currentValue: number, currentIndex: number, array: number[]) => U, initialValue: U): U; }; reduceRight: { (callbackfn: (previousValue: number, currentValue: number, currentIndex: number, array: number[]) => number): number; (callbackfn: (previousValue: number, currentValue: number, currentIndex: number, array: number[]) => number, initialValue: number): number; <U>(callbackfn: (previousValue: U, currentValue: number, currentIndex: number, array: number[]) => U, initialValue: U): U; }; find: { <S extends number>(predicate: (value: number, index: number, obj: number[]) => value is S, thisArg?: any): S; (predicate: (value: number, index: number, obj: number[]) => unknown, thisArg?: any): number; }; findIndex: (predicate: (value: number, index: number, obj: number[]) => unknown, thisArg?: any) => number; fill: (value: number, start?: number, end?: number) => number[]; copyWithin: (target: number, start: number, end?: number) => number[]; entries: () => BuiltinIterator<[number, number], void, undefined>; keys: () => BuiltinIterator<number, void, undefined>; values: () => BuiltinIterator<number, void, undefined>; includes: (searchElement: number, fromIndex?: number) => boolean; flatMap: <U, This = undefined>(callback: (this: This, value: number, index: number, array: number[]) => U | readonly U[], thisArg?: This) => U[]; flat: <A, D extends number = 1>(this: A, depth?: D) => FlatArray<A, D>[]; [Symbol.iterator]: () => BuiltinIterator<number, void, undefined>; readonly [Symbol.unscopables]: { [x: number]: boolean; length?: boolean; toString?: boolean; toLocaleString?: boolean; pop?: boolean; push?: boolean; concat?: boolean; join?: boolean; reverse?: boolean; shift?: boolean; slice?: boolean; sort?: boolean; splice?: boolean; unshift?: boolean; indexOf?: boolean; lastIndexOf?: boolean; every?: boolean; some?: boolean; forEach?: boolean; map?: boolean; filter?: boolean; reduce?: boolean; reduceRight?: boolean; find?: boolean; findIndex?: boolean; fill?: boolean; copyWithin?: boolean; entries?: boolean; keys?: boolean; values?: boolean; includes?: boolean; flatMap?: boolean; flat?: boolean; [Symbol.iterator]?: boolean; readonly [Symbol.unscopables]?: boolean; }; }' but required in type 'number[]'.
 
 
 ==== mappedTypeWithAsClauseAndLateBoundProperty.ts (1 errors) ====
@@ -6,6 +6,6 @@ mappedTypeWithAsClauseAndLateBoundProperty.ts(3,1): error TS2741: Property 'leng
     declare let src2: { [K in keyof number[] as Exclude<K, "length">]: (number[])[K] };
     tgt2 = src2; // Should error
     ~~~~
-!!! error TS2741: Property 'length' is missing in type '{ [x: number]: number; toString: () => string; toLocaleString: { (): string; (locales: string | string[], options?: NumberFormatOptions & DateTimeFormatOptions): string; }; pop: () => number; push: (...items: number[]) => number; concat: { (...items: ConcatArray<number>[]): number[]; (...items: (number | ConcatArray<number>)[]): number[]; }; join: (separator?: string) => string; reverse: () => number[]; shift: () => number; slice: (start?: number, end?: number) => number[]; sort: (compareFn?: (a: number, b: number) => number) => number[]; splice: { (start: number, deleteCount?: number): number[]; (start: number, deleteCount: number, ...items: number[]): number[]; }; unshift: (...items: number[]) => number; indexOf: (searchElement: number, fromIndex?: number) => number; lastIndexOf: (searchElement: number, fromIndex?: number) => number; every: { <S extends number>(predicate: (value: number, index: number, array: number[]) => value is S, thisArg?: any): this is S[]; (predicate: (value: number, index: number, array: number[]) => unknown, thisArg?: any): boolean; }; some: (predicate: (value: number, index: number, array: number[]) => unknown, thisArg?: any) => boolean; forEach: (callbackfn: (value: number, index: number, array: number[]) => void, thisArg?: any) => void; map: <U>(callbackfn: (value: number, index: number, array: number[]) => U, thisArg?: any) => U[]; filter: { <S extends number>(predicate: (value: number, index: number, array: number[]) => value is S, thisArg?: any): S[]; (predicate: (value: number, index: number, array: number[]) => unknown, thisArg?: any): number[]; }; reduce: { (callbackfn: (previousValue: number, currentValue: number, currentIndex: number, array: number[]) => number): number; (callbackfn: (previousValue: number, currentValue: number, currentIndex: number, array: number[]) => number, initialValue: number): number; <U>(callbackfn: (previousValue: U, currentValue: number, currentIndex: number, array: number[]) => U, initialValue: U): U; }; reduceRight: { (callbackfn: (previousValue: number, currentValue: number, currentIndex: number, array: number[]) => number): number; (callbackfn: (previousValue: number, currentValue: number, currentIndex: number, array: number[]) => number, initialValue: number): number; <U>(callbackfn: (previousValue: U, currentValue: number, currentIndex: number, array: number[]) => U, initialValue: U): U; }; find: { <S extends number>(predicate: (value: number, index: number, obj: number[]) => value is S, thisArg?: any): S; (predicate: (value: number, index: number, obj: number[]) => unknown, thisArg?: any): number; }; findIndex: (predicate: (value: number, index: number, obj: number[]) => unknown, thisArg?: any) => number; fill: (value: number, start?: number, end?: number) => number[]; copyWithin: (target: number, start: number, end?: number) => number[]; entries: () => IterableIterator<[number, number]>; keys: () => IterableIterator<number>; values: () => IterableIterator<number>; includes: (searchElement: number, fromIndex?: number) => boolean; flatMap: <U, This = undefined>(callback: (this: This, value: number, index: number, array: number[]) => U | readonly U[], thisArg?: This) => U[]; flat: <A, D extends number = 1>(this: A, depth?: D) => FlatArray<A, D>[]; [Symbol.iterator]: () => IterableIterator<number>; readonly [Symbol.unscopables]: { [x: number]: boolean; length?: boolean; toString?: boolean; toLocaleString?: boolean; pop?: boolean; push?: boolean; concat?: boolean; join?: boolean; reverse?: boolean; shift?: boolean; slice?: boolean; sort?: boolean; splice?: boolean; unshift?: boolean; indexOf?: boolean; lastIndexOf?: boolean; every?: boolean; some?: boolean; forEach?: boolean; map?: boolean; filter?: boolean; reduce?: boolean; reduceRight?: boolean; find?: boolean; findIndex?: boolean; fill?: boolean; copyWithin?: boolean; entries?: boolean; keys?: boolean; values?: boolean; includes?: boolean; flatMap?: boolean; flat?: boolean; [Symbol.iterator]?: boolean; readonly [Symbol.unscopables]?: boolean; }; }' but required in type 'number[]'.
+!!! error TS2741: Property 'length' is missing in type '{ [x: number]: number; toString: () => string; toLocaleString: { (): string; (locales: string | string[], options?: NumberFormatOptions & DateTimeFormatOptions): string; }; pop: () => number; push: (...items: number[]) => number; concat: { (...items: ConcatArray<number>[]): number[]; (...items: (number | ConcatArray<number>)[]): number[]; }; join: (separator?: string) => string; reverse: () => number[]; shift: () => number; slice: (start?: number, end?: number) => number[]; sort: (compareFn?: (a: number, b: number) => number) => number[]; splice: { (start: number, deleteCount?: number): number[]; (start: number, deleteCount: number, ...items: number[]): number[]; }; unshift: (...items: number[]) => number; indexOf: (searchElement: number, fromIndex?: number) => number; lastIndexOf: (searchElement: number, fromIndex?: number) => number; every: { <S extends number>(predicate: (value: number, index: number, array: number[]) => value is S, thisArg?: any): this is S[]; (predicate: (value: number, index: number, array: number[]) => unknown, thisArg?: any): boolean; }; some: (predicate: (value: number, index: number, array: number[]) => unknown, thisArg?: any) => boolean; forEach: (callbackfn: (value: number, index: number, array: number[]) => void, thisArg?: any) => void; map: <U>(callbackfn: (value: number, index: number, array: number[]) => U, thisArg?: any) => U[]; filter: { <S extends number>(predicate: (value: number, index: number, array: number[]) => value is S, thisArg?: any): S[]; (predicate: (value: number, index: number, array: number[]) => unknown, thisArg?: any): number[]; }; reduce: { (callbackfn: (previousValue: number, currentValue: number, currentIndex: number, array: number[]) => number): number; (callbackfn: (previousValue: number, currentValue: number, currentIndex: number, array: number[]) => number, initialValue: number): number; <U>(callbackfn: (previousValue: U, currentValue: number, currentIndex: number, array: number[]) => U, initialValue: U): U; }; reduceRight: { (callbackfn: (previousValue: number, currentValue: number, currentIndex: number, array: number[]) => number): number; (callbackfn: (previousValue: number, currentValue: number, currentIndex: number, array: number[]) => number, initialValue: number): number; <U>(callbackfn: (previousValue: U, currentValue: number, currentIndex: number, array: number[]) => U, initialValue: U): U; }; find: { <S extends number>(predicate: (value: number, index: number, obj: number[]) => value is S, thisArg?: any): S; (predicate: (value: number, index: number, obj: number[]) => unknown, thisArg?: any): number; }; findIndex: (predicate: (value: number, index: number, obj: number[]) => unknown, thisArg?: any) => number; fill: (value: number, start?: number, end?: number) => number[]; copyWithin: (target: number, start: number, end?: number) => number[]; entries: () => BuiltinIterator<[number, number], void, undefined>; keys: () => BuiltinIterator<number, void, undefined>; values: () => BuiltinIterator<number, void, undefined>; includes: (searchElement: number, fromIndex?: number) => boolean; flatMap: <U, This = undefined>(callback: (this: This, value: number, index: number, array: number[]) => U | readonly U[], thisArg?: This) => U[]; flat: <A, D extends number = 1>(this: A, depth?: D) => FlatArray<A, D>[]; [Symbol.iterator]: () => BuiltinIterator<number, void, undefined>; readonly [Symbol.unscopables]: { [x: number]: boolean; length?: boolean; toString?: boolean; toLocaleString?: boolean; pop?: boolean; push?: boolean; concat?: boolean; join?: boolean; reverse?: boolean; shift?: boolean; slice?: boolean; sort?: boolean; splice?: boolean; unshift?: boolean; indexOf?: boolean; lastIndexOf?: boolean; every?: boolean; some?: boolean; forEach?: boolean; map?: boolean; filter?: boolean; reduce?: boolean; reduceRight?: boolean; find?: boolean; findIndex?: boolean; fill?: boolean; copyWithin?: boolean; entries?: boolean; keys?: boolean; values?: boolean; includes?: boolean; flatMap?: boolean; flat?: boolean; [Symbol.iterator]?: boolean; readonly [Symbol.unscopables]?: boolean; }; }' but required in type 'number[]'.
 !!! related TS2728 lib.es5.d.ts:--:--: 'length' is declared here.
     
\ No newline at end of file
diff --git a/tests/baselines/reference/mappedTypeWithAsClauseAndLateBoundProperty.types b/tests/baselines/reference/mappedTypeWithAsClauseAndLateBoundProperty.types
index 263f5212c5853..fc4bc8b493a18 100644
--- a/tests/baselines/reference/mappedTypeWithAsClauseAndLateBoundProperty.types
+++ b/tests/baselines/reference/mappedTypeWithAsClauseAndLateBoundProperty.types
@@ -6,14 +6,14 @@ declare let tgt2: number[];
 >     : ^^^^^^^^
 
 declare let src2: { [K in keyof number[] as Exclude<K, "length">]: (number[])[K] };
->src2 : { [x: number]: number; toString: () => string; toLocaleString: { (): string; (locales: string | string[], options?: Intl.NumberFormatOptions & Intl.DateTimeFormatOptions): string; }; pop: () => number; push: (...items: number[]) => number; concat: { (...items: ConcatArray<number>[]): number[]; (...items: (number | ConcatArray<number>)[]): number[]; }; join: (separator?: string) => string; reverse: () => number[]; shift: () => number; slice: (start?: number, end?: number) => number[]; sort: (compareFn?: (a: number, b: number) => number) => number[]; splice: { (start: number, deleteCount?: number): number[]; (start: number, deleteCount: number, ...items: number[]): number[]; }; unshift: (...items: number[]) => number; indexOf: (searchElement: number, fromIndex?: number) => number; lastIndexOf: (searchElement: number, fromIndex?: number) => number; every: { <S extends number>(predicate: (value: number, index: number, array: number[]) => value is S, thisArg?: any): this is S[]; (predicate: (value: number, index: number, array: number[]) => unknown, thisArg?: any): boolean; }; some: (predicate: (value: number, index: number, array: number[]) => unknown, thisArg?: any) => boolean; forEach: (callbackfn: (value: number, index: number, array: number[]) => void, thisArg?: any) => void; map: <U>(callbackfn: (value: number, index: number, array: number[]) => U, thisArg?: any) => U[]; filter: { <S_1 extends number>(predicate: (value: number, index: number, array: number[]) => value is S_1, thisArg?: any): S_1[]; (predicate: (value: number, index: number, array: number[]) => unknown, thisArg?: any): number[]; }; reduce: { (callbackfn: (previousValue: number, currentValue: number, currentIndex: number, array: number[]) => number): number; (callbackfn: (previousValue: number, currentValue: number, currentIndex: number, array: number[]) => number, initialValue: number): number; <U_1>(callbackfn: (previousValue: U_1, currentValue: number, currentIndex: number, array: number[]) => U_1, initialValue: U_1): U_1; }; reduceRight: { (callbackfn: (previousValue: number, currentValue: number, currentIndex: number, array: number[]) => number): number; (callbackfn: (previousValue: number, currentValue: number, currentIndex: number, array: number[]) => number, initialValue: number): number; <U_2>(callbackfn: (previousValue: U_2, currentValue: number, currentIndex: number, array: number[]) => U_2, initialValue: U_2): U_2; }; find: { <S_2 extends number>(predicate: (value: number, index: number, obj: number[]) => value is S_2, thisArg?: any): S_2; (predicate: (value: number, index: number, obj: number[]) => unknown, thisArg?: any): number; }; findIndex: (predicate: (value: number, index: number, obj: number[]) => unknown, thisArg?: any) => number; fill: (value: number, start?: number, end?: number) => number[]; copyWithin: (target: number, start: number, end?: number) => number[]; entries: () => IterableIterator<[number, number]>; keys: () => IterableIterator<number>; values: () => IterableIterator<number>; includes: (searchElement: number, fromIndex?: number) => boolean; flatMap: <U_3, This = undefined>(callback: (this: This, value: number, index: number, array: number[]) => U_3 | readonly U_3[], thisArg?: This) => U_3[]; flat: <A, D extends number = 1>(this: A, depth?: D) => FlatArray<A, D>[]; [Symbol.iterator]: () => IterableIterator<number>; readonly [Symbol.unscopables]: { [x: number]: boolean; length?: boolean; toString?: boolean; toLocaleString?: boolean; pop?: boolean; push?: boolean; concat?: boolean; join?: boolean; reverse?: boolean; shift?: boolean; slice?: boolean; sort?: boolean; splice?: boolean; unshift?: boolean; indexOf?: boolean; lastIndexOf?: boolean; every?: boolean; some?: boolean; forEach?: boolean; map?: boolean; filter?: boolean; reduce?: boolean; reduceRight?: boolean; find?: boolean; findIndex?: boolean; fill?: boolean; copyWithin?: boolean; entries?: boolean; keys?: boolean; values?: boolean; includes?: boolean; flatMap?: boolean; flat?: boolean; [Symbol.iterator]?: boolean; readonly [Symbol.unscopables]?: boolean; }; }
->     : ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^       ^^                 ^^       ^^^                                                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^         ^^^      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^     ^^^      ^^   ^^^      ^^^^^^^^^^^^^^^^^^^^^^         ^^^^ ^^^^^^^^^^ ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^     ^^      ^^           ^^^      ^^^^^^^^^^^^^^     ^^      ^^           ^^      ^^^^^     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^             ^^^^^^^^^^         ^^^      ^^^^^^^^^^^^^^^^^^^^^^^^^^^             ^^^^^^^^^^         ^^^      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^         ^^^     ^^^^^^^^^^     ^^      ^^     ^^^^^^^^^^^^^^^^^^^^^^^^^^^       ^^^   ^^^^^^^^^^^^^^^^^         ^^^     ^^^^^^^^^^     ^^      ^^     ^^^^^^^^^^^^^^^^^^^^^^^^       ^^^   ^^^^^^^^^^^^^^^^^^^^^^         ^^^     ^^^^^^^^^^     ^^      ^^     ^^^^^^^^^^^^^^^^^^^^^^^^       ^^^   ^^^^^^^^^^^^^^^^^^^^^^^^          ^^^     ^^^^^^^^^^     ^^      ^^     ^^^^^^^^^^^^^^^^^^^^^       ^^^   ^^^^^^^^^^^^^^^^^^^^          ^^^     ^^^^^^^^^^     ^^      ^^     ^^^^^^^^^^^^^^^^^^       ^^^   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^         ^^^     ^^^^^^^^^^     ^^      ^^     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^       ^^^   ^^^^^^^^^^^         ^^^     ^^^^^^^^^^     ^^      ^^     ^^^^^^^^^^^^^^^^^^^^^^^^       ^^^   ^^^^^^^^^^^^^^^^^^^^^^^^^^^          ^^^             ^^^^^^^^^^            ^^^^^^^^^^            ^^      ^^     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^          ^^^             ^^^^^^^^^^            ^^^^^^^^^^            ^^      ^^     ^^^^^^^^^^^^^^^^^^^^^^^            ^^^^^^^^^^^^^^^^^^^^^^^^^          ^^^             ^^^^^^^            ^^^^^^^^^^            ^^      ^^     ^^^^^^^^^^^^^^^^^^^^            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^          ^^^             ^^^^^^^^^^            ^^^^^^^^^^            ^^      ^^     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^          ^^^             ^^^^^^^^^^            ^^^^^^^^^^            ^^      ^^     ^^^^^^^^^^^^^^^^^^^^^^^            ^^^^^^^^^^^^^^^^^^^^^^^^^          ^^^             ^^^^^^^            ^^^^^^^^^^            ^^      ^^     ^^^^^^^^^^^^^^^^^^^^            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^         ^^^     ^^^^^^^^^^     ^^      ^^   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^       ^^^   ^^^^^^^^^         ^^^     ^^^^^^^^^^     ^^      ^^   ^^^^^^^^^^^^^^^^^^^^^^^^       ^^^   ^^^^^^^^^^^^^^^^^^^^^^^^^^         ^^^     ^^^^^^^^^^     ^^      ^^   ^^^^^^^^^^^^^^^^^^^^^^^^       ^^^   ^^^^^^^^^^^^^^^^^^^^     ^^^^^^^^^^     ^^^      ^^   ^^^      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^      ^^      ^^     ^^      ^^   ^^^      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^             ^^^^^^^^^^         ^^^      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^        ^^^    ^^^^^^^^     ^^^^^^^^^^     ^^      ^^     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^    ^^^^^     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+>src2 : { [x: number]: number; toString: () => string; toLocaleString: { (): string; (locales: string | string[], options?: Intl.NumberFormatOptions & Intl.DateTimeFormatOptions): string; }; pop: () => number; push: (...items: number[]) => number; concat: { (...items: ConcatArray<number>[]): number[]; (...items: (number | ConcatArray<number>)[]): number[]; }; join: (separator?: string) => string; reverse: () => number[]; shift: () => number; slice: (start?: number, end?: number) => number[]; sort: (compareFn?: (a: number, b: number) => number) => number[]; splice: { (start: number, deleteCount?: number): number[]; (start: number, deleteCount: number, ...items: number[]): number[]; }; unshift: (...items: number[]) => number; indexOf: (searchElement: number, fromIndex?: number) => number; lastIndexOf: (searchElement: number, fromIndex?: number) => number; every: { <S extends number>(predicate: (value: number, index: number, array: number[]) => value is S, thisArg?: any): this is S[]; (predicate: (value: number, index: number, array: number[]) => unknown, thisArg?: any): boolean; }; some: (predicate: (value: number, index: number, array: number[]) => unknown, thisArg?: any) => boolean; forEach: (callbackfn: (value: number, index: number, array: number[]) => void, thisArg?: any) => void; map: <U>(callbackfn: (value: number, index: number, array: number[]) => U, thisArg?: any) => U[]; filter: { <S_1 extends number>(predicate: (value: number, index: number, array: number[]) => value is S_1, thisArg?: any): S_1[]; (predicate: (value: number, index: number, array: number[]) => unknown, thisArg?: any): number[]; }; reduce: { (callbackfn: (previousValue: number, currentValue: number, currentIndex: number, array: number[]) => number): number; (callbackfn: (previousValue: number, currentValue: number, currentIndex: number, array: number[]) => number, initialValue: number): number; <U_1>(callbackfn: (previousValue: U_1, currentValue: number, currentIndex: number, array: number[]) => U_1, initialValue: U_1): U_1; }; reduceRight: { (callbackfn: (previousValue: number, currentValue: number, currentIndex: number, array: number[]) => number): number; (callbackfn: (previousValue: number, currentValue: number, currentIndex: number, array: number[]) => number, initialValue: number): number; <U_2>(callbackfn: (previousValue: U_2, currentValue: number, currentIndex: number, array: number[]) => U_2, initialValue: U_2): U_2; }; find: { <S_2 extends number>(predicate: (value: number, index: number, obj: number[]) => value is S_2, thisArg?: any): S_2; (predicate: (value: number, index: number, obj: number[]) => unknown, thisArg?: any): number; }; findIndex: (predicate: (value: number, index: number, obj: number[]) => unknown, thisArg?: any) => number; fill: (value: number, start?: number, end?: number) => number[]; copyWithin: (target: number, start: number, end?: number) => number[]; entries: () => BuiltinIterator<[number, number], void, undefined>; keys: () => BuiltinIterator<number, void, undefined>; values: () => BuiltinIterator<number, void, undefined>; includes: (searchElement: number, fromIndex?: number) => boolean; flatMap: <U_3, This = undefined>(callback: (this: This, value: number, index: number, array: number[]) => U_3 | readonly U_3[], thisArg?: This) => U_3[]; flat: <A, D extends number = 1>(this: A, depth?: D) => FlatArray<A, D>[]; [Symbol.iterator]: () => BuiltinIterator<number, void, undefined>; readonly [Symbol.unscopables]: { [x: number]: boolean; length?: boolean; toString?: boolean; toLocaleString?: boolean; pop?: boolean; push?: boolean; concat?: boolean; join?: boolean; reverse?: boolean; shift?: boolean; slice?: boolean; sort?: boolean; splice?: boolean; unshift?: boolean; indexOf?: boolean; lastIndexOf?: boolean; every?: boolean; some?: boolean; forEach?: boolean; map?: boolean; filter?: boolean; reduce?: boolean; reduceRight?: boolean; find?: boolean; findIndex?: boolean; fill?: boolean; copyWithin?: boolean; entries?: boolean; keys?: boolean; values?: boolean; includes?: boolean; flatMap?: boolean; flat?: boolean; [Symbol.iterator]?: boolean; readonly [Symbol.unscopables]?: boolean; }; }
+>     : ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^       ^^                 ^^       ^^^                                                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^         ^^^      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^     ^^^      ^^   ^^^      ^^^^^^^^^^^^^^^^^^^^^^         ^^^^ ^^^^^^^^^^ ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^     ^^      ^^           ^^^      ^^^^^^^^^^^^^^     ^^      ^^           ^^      ^^^^^     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^             ^^^^^^^^^^         ^^^      ^^^^^^^^^^^^^^^^^^^^^^^^^^^             ^^^^^^^^^^         ^^^      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^         ^^^     ^^^^^^^^^^     ^^      ^^     ^^^^^^^^^^^^^^^^^^^^^^^^^^^       ^^^   ^^^^^^^^^^^^^^^^^         ^^^     ^^^^^^^^^^     ^^      ^^     ^^^^^^^^^^^^^^^^^^^^^^^^       ^^^   ^^^^^^^^^^^^^^^^^^^^^^         ^^^     ^^^^^^^^^^     ^^      ^^     ^^^^^^^^^^^^^^^^^^^^^^^^       ^^^   ^^^^^^^^^^^^^^^^^^^^^^^^          ^^^     ^^^^^^^^^^     ^^      ^^     ^^^^^^^^^^^^^^^^^^^^^       ^^^   ^^^^^^^^^^^^^^^^^^^^          ^^^     ^^^^^^^^^^     ^^      ^^     ^^^^^^^^^^^^^^^^^^       ^^^   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^         ^^^     ^^^^^^^^^^     ^^      ^^     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^       ^^^   ^^^^^^^^^^^         ^^^     ^^^^^^^^^^     ^^      ^^     ^^^^^^^^^^^^^^^^^^^^^^^^       ^^^   ^^^^^^^^^^^^^^^^^^^^^^^^^^^          ^^^             ^^^^^^^^^^            ^^^^^^^^^^            ^^      ^^     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^          ^^^             ^^^^^^^^^^            ^^^^^^^^^^            ^^      ^^     ^^^^^^^^^^^^^^^^^^^^^^^            ^^^^^^^^^^^^^^^^^^^^^^^^^          ^^^             ^^^^^^^            ^^^^^^^^^^            ^^      ^^     ^^^^^^^^^^^^^^^^^^^^            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^          ^^^             ^^^^^^^^^^            ^^^^^^^^^^            ^^      ^^     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^          ^^^             ^^^^^^^^^^            ^^^^^^^^^^            ^^      ^^     ^^^^^^^^^^^^^^^^^^^^^^^            ^^^^^^^^^^^^^^^^^^^^^^^^^          ^^^             ^^^^^^^            ^^^^^^^^^^            ^^      ^^     ^^^^^^^^^^^^^^^^^^^^            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^         ^^^     ^^^^^^^^^^     ^^      ^^   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^       ^^^   ^^^^^^^^^         ^^^     ^^^^^^^^^^     ^^      ^^   ^^^^^^^^^^^^^^^^^^^^^^^^       ^^^   ^^^^^^^^^^^^^^^^^^^^^^^^^^         ^^^     ^^^^^^^^^^     ^^      ^^   ^^^^^^^^^^^^^^^^^^^^^^^^       ^^^   ^^^^^^^^^^^^^^^^^^^^     ^^^^^^^^^^     ^^^      ^^   ^^^      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^      ^^      ^^     ^^      ^^   ^^^      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^             ^^^^^^^^^^         ^^^      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^        ^^^    ^^^^^^^^     ^^^^^^^^^^     ^^      ^^     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^    ^^^^^     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
 tgt2 = src2; // Should error
->tgt2 = src2 : { [x: number]: number; toString: () => string; toLocaleString: { (): string; (locales: string | string[], options?: Intl.NumberFormatOptions & Intl.DateTimeFormatOptions): string; }; pop: () => number; push: (...items: number[]) => number; concat: { (...items: ConcatArray<number>[]): number[]; (...items: (number | ConcatArray<number>)[]): number[]; }; join: (separator?: string) => string; reverse: () => number[]; shift: () => number; slice: (start?: number, end?: number) => number[]; sort: (compareFn?: (a: number, b: number) => number) => number[]; splice: { (start: number, deleteCount?: number): number[]; (start: number, deleteCount: number, ...items: number[]): number[]; }; unshift: (...items: number[]) => number; indexOf: (searchElement: number, fromIndex?: number) => number; lastIndexOf: (searchElement: number, fromIndex?: number) => number; every: { <S extends number>(predicate: (value: number, index: number, array: number[]) => value is S, thisArg?: any): this is S[]; (predicate: (value: number, index: number, array: number[]) => unknown, thisArg?: any): boolean; }; some: (predicate: (value: number, index: number, array: number[]) => unknown, thisArg?: any) => boolean; forEach: (callbackfn: (value: number, index: number, array: number[]) => void, thisArg?: any) => void; map: <U>(callbackfn: (value: number, index: number, array: number[]) => U, thisArg?: any) => U[]; filter: { <S_1 extends number>(predicate: (value: number, index: number, array: number[]) => value is S_1, thisArg?: any): S_1[]; (predicate: (value: number, index: number, array: number[]) => unknown, thisArg?: any): number[]; }; reduce: { (callbackfn: (previousValue: number, currentValue: number, currentIndex: number, array: number[]) => number): number; (callbackfn: (previousValue: number, currentValue: number, currentIndex: number, array: number[]) => number, initialValue: number): number; <U_1>(callbackfn: (previousValue: U_1, currentValue: number, currentIndex: number, array: number[]) => U_1, initialValue: U_1): U_1; }; reduceRight: { (callbackfn: (previousValue: number, currentValue: number, currentIndex: number, array: number[]) => number): number; (callbackfn: (previousValue: number, currentValue: number, currentIndex: number, array: number[]) => number, initialValue: number): number; <U_2>(callbackfn: (previousValue: U_2, currentValue: number, currentIndex: number, array: number[]) => U_2, initialValue: U_2): U_2; }; find: { <S_2 extends number>(predicate: (value: number, index: number, obj: number[]) => value is S_2, thisArg?: any): S_2; (predicate: (value: number, index: number, obj: number[]) => unknown, thisArg?: any): number; }; findIndex: (predicate: (value: number, index: number, obj: number[]) => unknown, thisArg?: any) => number; fill: (value: number, start?: number, end?: number) => number[]; copyWithin: (target: number, start: number, end?: number) => number[]; entries: () => IterableIterator<[number, number]>; keys: () => IterableIterator<number>; values: () => IterableIterator<number>; includes: (searchElement: number, fromIndex?: number) => boolean; flatMap: <U_3, This = undefined>(callback: (this: This, value: number, index: number, array: number[]) => U_3 | readonly U_3[], thisArg?: This) => U_3[]; flat: <A, D extends number = 1>(this: A, depth?: D) => FlatArray<A, D>[]; [Symbol.iterator]: () => IterableIterator<number>; readonly [Symbol.unscopables]: { [x: number]: boolean; length?: boolean; toString?: boolean; toLocaleString?: boolean; pop?: boolean; push?: boolean; concat?: boolean; join?: boolean; reverse?: boolean; shift?: boolean; slice?: boolean; sort?: boolean; splice?: boolean; unshift?: boolean; indexOf?: boolean; lastIndexOf?: boolean; every?: boolean; some?: boolean; forEach?: boolean; map?: boolean; filter?: boolean; reduce?: boolean; reduceRight?: boolean; find?: boolean; findIndex?: boolean; fill?: boolean; copyWithin?: boolean; entries?: boolean; keys?: boolean; values?: boolean; includes?: boolean; flatMap?: boolean; flat?: boolean; [Symbol.iterator]?: boolean; readonly [Symbol.unscopables]?: boolean; }; }
->            : ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^       ^^                 ^^       ^^^                                                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^         ^^^      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^     ^^^      ^^   ^^^      ^^^^^^^^^^^^^^^^^^^^^^         ^^^^ ^^^^^^^^^^ ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^     ^^      ^^           ^^^      ^^^^^^^^^^^^^^     ^^      ^^           ^^      ^^^^^     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^             ^^^^^^^^^^         ^^^      ^^^^^^^^^^^^^^^^^^^^^^^^^^^             ^^^^^^^^^^         ^^^      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^         ^^^     ^^^^^^^^^^     ^^      ^^     ^^^^^^^^^^^^^^^^^^^^^^^^^^^       ^^^   ^^^^^^^^^^^^^^^^^         ^^^     ^^^^^^^^^^     ^^      ^^     ^^^^^^^^^^^^^^^^^^^^^^^^       ^^^   ^^^^^^^^^^^^^^^^^^^^^^         ^^^     ^^^^^^^^^^     ^^      ^^     ^^^^^^^^^^^^^^^^^^^^^^^^       ^^^   ^^^^^^^^^^^^^^^^^^^^^^^^          ^^^     ^^^^^^^^^^     ^^      ^^     ^^^^^^^^^^^^^^^^^^^^^       ^^^   ^^^^^^^^^^^^^^^^^^^^          ^^^     ^^^^^^^^^^     ^^      ^^     ^^^^^^^^^^^^^^^^^^       ^^^   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^         ^^^     ^^^^^^^^^^     ^^      ^^     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^       ^^^   ^^^^^^^^^^^         ^^^     ^^^^^^^^^^     ^^      ^^     ^^^^^^^^^^^^^^^^^^^^^^^^       ^^^   ^^^^^^^^^^^^^^^^^^^^^^^^^^^          ^^^             ^^^^^^^^^^            ^^^^^^^^^^            ^^      ^^     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^          ^^^             ^^^^^^^^^^            ^^^^^^^^^^            ^^      ^^     ^^^^^^^^^^^^^^^^^^^^^^^            ^^^^^^^^^^^^^^^^^^^^^^^^^          ^^^             ^^^^^^^            ^^^^^^^^^^            ^^      ^^     ^^^^^^^^^^^^^^^^^^^^            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^          ^^^             ^^^^^^^^^^            ^^^^^^^^^^            ^^      ^^     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^          ^^^             ^^^^^^^^^^            ^^^^^^^^^^            ^^      ^^     ^^^^^^^^^^^^^^^^^^^^^^^            ^^^^^^^^^^^^^^^^^^^^^^^^^          ^^^             ^^^^^^^            ^^^^^^^^^^            ^^      ^^     ^^^^^^^^^^^^^^^^^^^^            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^         ^^^     ^^^^^^^^^^     ^^      ^^   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^       ^^^   ^^^^^^^^^         ^^^     ^^^^^^^^^^     ^^      ^^   ^^^^^^^^^^^^^^^^^^^^^^^^       ^^^   ^^^^^^^^^^^^^^^^^^^^^^^^^^         ^^^     ^^^^^^^^^^     ^^      ^^   ^^^^^^^^^^^^^^^^^^^^^^^^       ^^^   ^^^^^^^^^^^^^^^^^^^^     ^^^^^^^^^^     ^^^      ^^   ^^^      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^      ^^      ^^     ^^      ^^   ^^^      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^             ^^^^^^^^^^         ^^^      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^        ^^^    ^^^^^^^^     ^^^^^^^^^^     ^^      ^^     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^    ^^^^^     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+>tgt2 = src2 : { [x: number]: number; toString: () => string; toLocaleString: { (): string; (locales: string | string[], options?: Intl.NumberFormatOptions & Intl.DateTimeFormatOptions): string; }; pop: () => number; push: (...items: number[]) => number; concat: { (...items: ConcatArray<number>[]): number[]; (...items: (number | ConcatArray<number>)[]): number[]; }; join: (separator?: string) => string; reverse: () => number[]; shift: () => number; slice: (start?: number, end?: number) => number[]; sort: (compareFn?: (a: number, b: number) => number) => number[]; splice: { (start: number, deleteCount?: number): number[]; (start: number, deleteCount: number, ...items: number[]): number[]; }; unshift: (...items: number[]) => number; indexOf: (searchElement: number, fromIndex?: number) => number; lastIndexOf: (searchElement: number, fromIndex?: number) => number; every: { <S extends number>(predicate: (value: number, index: number, array: number[]) => value is S, thisArg?: any): this is S[]; (predicate: (value: number, index: number, array: number[]) => unknown, thisArg?: any): boolean; }; some: (predicate: (value: number, index: number, array: number[]) => unknown, thisArg?: any) => boolean; forEach: (callbackfn: (value: number, index: number, array: number[]) => void, thisArg?: any) => void; map: <U>(callbackfn: (value: number, index: number, array: number[]) => U, thisArg?: any) => U[]; filter: { <S_1 extends number>(predicate: (value: number, index: number, array: number[]) => value is S_1, thisArg?: any): S_1[]; (predicate: (value: number, index: number, array: number[]) => unknown, thisArg?: any): number[]; }; reduce: { (callbackfn: (previousValue: number, currentValue: number, currentIndex: number, array: number[]) => number): number; (callbackfn: (previousValue: number, currentValue: number, currentIndex: number, array: number[]) => number, initialValue: number): number; <U_1>(callbackfn: (previousValue: U_1, currentValue: number, currentIndex: number, array: number[]) => U_1, initialValue: U_1): U_1; }; reduceRight: { (callbackfn: (previousValue: number, currentValue: number, currentIndex: number, array: number[]) => number): number; (callbackfn: (previousValue: number, currentValue: number, currentIndex: number, array: number[]) => number, initialValue: number): number; <U_2>(callbackfn: (previousValue: U_2, currentValue: number, currentIndex: number, array: number[]) => U_2, initialValue: U_2): U_2; }; find: { <S_2 extends number>(predicate: (value: number, index: number, obj: number[]) => value is S_2, thisArg?: any): S_2; (predicate: (value: number, index: number, obj: number[]) => unknown, thisArg?: any): number; }; findIndex: (predicate: (value: number, index: number, obj: number[]) => unknown, thisArg?: any) => number; fill: (value: number, start?: number, end?: number) => number[]; copyWithin: (target: number, start: number, end?: number) => number[]; entries: () => BuiltinIterator<[number, number], void, undefined>; keys: () => BuiltinIterator<number, void, undefined>; values: () => BuiltinIterator<number, void, undefined>; includes: (searchElement: number, fromIndex?: number) => boolean; flatMap: <U_3, This = undefined>(callback: (this: This, value: number, index: number, array: number[]) => U_3 | readonly U_3[], thisArg?: This) => U_3[]; flat: <A, D extends number = 1>(this: A, depth?: D) => FlatArray<A, D>[]; [Symbol.iterator]: () => BuiltinIterator<number, void, undefined>; readonly [Symbol.unscopables]: { [x: number]: boolean; length?: boolean; toString?: boolean; toLocaleString?: boolean; pop?: boolean; push?: boolean; concat?: boolean; join?: boolean; reverse?: boolean; shift?: boolean; slice?: boolean; sort?: boolean; splice?: boolean; unshift?: boolean; indexOf?: boolean; lastIndexOf?: boolean; every?: boolean; some?: boolean; forEach?: boolean; map?: boolean; filter?: boolean; reduce?: boolean; reduceRight?: boolean; find?: boolean; findIndex?: boolean; fill?: boolean; copyWithin?: boolean; entries?: boolean; keys?: boolean; values?: boolean; includes?: boolean; flatMap?: boolean; flat?: boolean; [Symbol.iterator]?: boolean; readonly [Symbol.unscopables]?: boolean; }; }
+>            : ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^       ^^                 ^^       ^^^                                                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^         ^^^      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^     ^^^      ^^   ^^^      ^^^^^^^^^^^^^^^^^^^^^^         ^^^^ ^^^^^^^^^^ ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^     ^^      ^^           ^^^      ^^^^^^^^^^^^^^     ^^      ^^           ^^      ^^^^^     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^             ^^^^^^^^^^         ^^^      ^^^^^^^^^^^^^^^^^^^^^^^^^^^             ^^^^^^^^^^         ^^^      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^         ^^^     ^^^^^^^^^^     ^^      ^^     ^^^^^^^^^^^^^^^^^^^^^^^^^^^       ^^^   ^^^^^^^^^^^^^^^^^         ^^^     ^^^^^^^^^^     ^^      ^^     ^^^^^^^^^^^^^^^^^^^^^^^^       ^^^   ^^^^^^^^^^^^^^^^^^^^^^         ^^^     ^^^^^^^^^^     ^^      ^^     ^^^^^^^^^^^^^^^^^^^^^^^^       ^^^   ^^^^^^^^^^^^^^^^^^^^^^^^          ^^^     ^^^^^^^^^^     ^^      ^^     ^^^^^^^^^^^^^^^^^^^^^       ^^^   ^^^^^^^^^^^^^^^^^^^^          ^^^     ^^^^^^^^^^     ^^      ^^     ^^^^^^^^^^^^^^^^^^       ^^^   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^         ^^^     ^^^^^^^^^^     ^^      ^^     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^       ^^^   ^^^^^^^^^^^         ^^^     ^^^^^^^^^^     ^^      ^^     ^^^^^^^^^^^^^^^^^^^^^^^^       ^^^   ^^^^^^^^^^^^^^^^^^^^^^^^^^^          ^^^             ^^^^^^^^^^            ^^^^^^^^^^            ^^      ^^     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^          ^^^             ^^^^^^^^^^            ^^^^^^^^^^            ^^      ^^     ^^^^^^^^^^^^^^^^^^^^^^^            ^^^^^^^^^^^^^^^^^^^^^^^^^          ^^^             ^^^^^^^            ^^^^^^^^^^            ^^      ^^     ^^^^^^^^^^^^^^^^^^^^            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^          ^^^             ^^^^^^^^^^            ^^^^^^^^^^            ^^      ^^     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^          ^^^             ^^^^^^^^^^            ^^^^^^^^^^            ^^      ^^     ^^^^^^^^^^^^^^^^^^^^^^^            ^^^^^^^^^^^^^^^^^^^^^^^^^          ^^^             ^^^^^^^            ^^^^^^^^^^            ^^      ^^     ^^^^^^^^^^^^^^^^^^^^            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^         ^^^     ^^^^^^^^^^     ^^      ^^   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^       ^^^   ^^^^^^^^^         ^^^     ^^^^^^^^^^     ^^      ^^   ^^^^^^^^^^^^^^^^^^^^^^^^       ^^^   ^^^^^^^^^^^^^^^^^^^^^^^^^^         ^^^     ^^^^^^^^^^     ^^      ^^   ^^^^^^^^^^^^^^^^^^^^^^^^       ^^^   ^^^^^^^^^^^^^^^^^^^^     ^^^^^^^^^^     ^^^      ^^   ^^^      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^      ^^      ^^     ^^      ^^   ^^^      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^             ^^^^^^^^^^         ^^^      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^        ^^^    ^^^^^^^^     ^^^^^^^^^^     ^^      ^^     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^    ^^^^^     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 >tgt2 : number[]
 >     : ^^^^^^^^
->src2 : { [x: number]: number; toString: () => string; toLocaleString: { (): string; (locales: string | string[], options?: Intl.NumberFormatOptions & Intl.DateTimeFormatOptions): string; }; pop: () => number; push: (...items: number[]) => number; concat: { (...items: ConcatArray<number>[]): number[]; (...items: (number | ConcatArray<number>)[]): number[]; }; join: (separator?: string) => string; reverse: () => number[]; shift: () => number; slice: (start?: number, end?: number) => number[]; sort: (compareFn?: (a: number, b: number) => number) => number[]; splice: { (start: number, deleteCount?: number): number[]; (start: number, deleteCount: number, ...items: number[]): number[]; }; unshift: (...items: number[]) => number; indexOf: (searchElement: number, fromIndex?: number) => number; lastIndexOf: (searchElement: number, fromIndex?: number) => number; every: { <S extends number>(predicate: (value: number, index: number, array: number[]) => value is S, thisArg?: any): this is S[]; (predicate: (value: number, index: number, array: number[]) => unknown, thisArg?: any): boolean; }; some: (predicate: (value: number, index: number, array: number[]) => unknown, thisArg?: any) => boolean; forEach: (callbackfn: (value: number, index: number, array: number[]) => void, thisArg?: any) => void; map: <U>(callbackfn: (value: number, index: number, array: number[]) => U, thisArg?: any) => U[]; filter: { <S_1 extends number>(predicate: (value: number, index: number, array: number[]) => value is S_1, thisArg?: any): S_1[]; (predicate: (value: number, index: number, array: number[]) => unknown, thisArg?: any): number[]; }; reduce: { (callbackfn: (previousValue: number, currentValue: number, currentIndex: number, array: number[]) => number): number; (callbackfn: (previousValue: number, currentValue: number, currentIndex: number, array: number[]) => number, initialValue: number): number; <U_1>(callbackfn: (previousValue: U_1, currentValue: number, currentIndex: number, array: number[]) => U_1, initialValue: U_1): U_1; }; reduceRight: { (callbackfn: (previousValue: number, currentValue: number, currentIndex: number, array: number[]) => number): number; (callbackfn: (previousValue: number, currentValue: number, currentIndex: number, array: number[]) => number, initialValue: number): number; <U_2>(callbackfn: (previousValue: U_2, currentValue: number, currentIndex: number, array: number[]) => U_2, initialValue: U_2): U_2; }; find: { <S_2 extends number>(predicate: (value: number, index: number, obj: number[]) => value is S_2, thisArg?: any): S_2; (predicate: (value: number, index: number, obj: number[]) => unknown, thisArg?: any): number; }; findIndex: (predicate: (value: number, index: number, obj: number[]) => unknown, thisArg?: any) => number; fill: (value: number, start?: number, end?: number) => number[]; copyWithin: (target: number, start: number, end?: number) => number[]; entries: () => IterableIterator<[number, number]>; keys: () => IterableIterator<number>; values: () => IterableIterator<number>; includes: (searchElement: number, fromIndex?: number) => boolean; flatMap: <U_3, This = undefined>(callback: (this: This, value: number, index: number, array: number[]) => U_3 | readonly U_3[], thisArg?: This) => U_3[]; flat: <A, D extends number = 1>(this: A, depth?: D) => FlatArray<A, D>[]; [Symbol.iterator]: () => IterableIterator<number>; readonly [Symbol.unscopables]: { [x: number]: boolean; length?: boolean; toString?: boolean; toLocaleString?: boolean; pop?: boolean; push?: boolean; concat?: boolean; join?: boolean; reverse?: boolean; shift?: boolean; slice?: boolean; sort?: boolean; splice?: boolean; unshift?: boolean; indexOf?: boolean; lastIndexOf?: boolean; every?: boolean; some?: boolean; forEach?: boolean; map?: boolean; filter?: boolean; reduce?: boolean; reduceRight?: boolean; find?: boolean; findIndex?: boolean; fill?: boolean; copyWithin?: boolean; entries?: boolean; keys?: boolean; values?: boolean; includes?: boolean; flatMap?: boolean; flat?: boolean; [Symbol.iterator]?: boolean; readonly [Symbol.unscopables]?: boolean; }; }
->     : ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^       ^^                 ^^       ^^^                                                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^         ^^^      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^     ^^^      ^^   ^^^      ^^^^^^^^^^^^^^^^^^^^^^         ^^^^ ^^^^^^^^^^ ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^     ^^      ^^           ^^^      ^^^^^^^^^^^^^^     ^^      ^^           ^^      ^^^^^     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^             ^^^^^^^^^^         ^^^      ^^^^^^^^^^^^^^^^^^^^^^^^^^^             ^^^^^^^^^^         ^^^      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^         ^^^     ^^^^^^^^^^     ^^      ^^     ^^^^^^^^^^^^^^^^^^^^^^^^^^^       ^^^   ^^^^^^^^^^^^^^^^^         ^^^     ^^^^^^^^^^     ^^      ^^     ^^^^^^^^^^^^^^^^^^^^^^^^       ^^^   ^^^^^^^^^^^^^^^^^^^^^^         ^^^     ^^^^^^^^^^     ^^      ^^     ^^^^^^^^^^^^^^^^^^^^^^^^       ^^^   ^^^^^^^^^^^^^^^^^^^^^^^^          ^^^     ^^^^^^^^^^     ^^      ^^     ^^^^^^^^^^^^^^^^^^^^^       ^^^   ^^^^^^^^^^^^^^^^^^^^          ^^^     ^^^^^^^^^^     ^^      ^^     ^^^^^^^^^^^^^^^^^^       ^^^   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^         ^^^     ^^^^^^^^^^     ^^      ^^     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^       ^^^   ^^^^^^^^^^^         ^^^     ^^^^^^^^^^     ^^      ^^     ^^^^^^^^^^^^^^^^^^^^^^^^       ^^^   ^^^^^^^^^^^^^^^^^^^^^^^^^^^          ^^^             ^^^^^^^^^^            ^^^^^^^^^^            ^^      ^^     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^          ^^^             ^^^^^^^^^^            ^^^^^^^^^^            ^^      ^^     ^^^^^^^^^^^^^^^^^^^^^^^            ^^^^^^^^^^^^^^^^^^^^^^^^^          ^^^             ^^^^^^^            ^^^^^^^^^^            ^^      ^^     ^^^^^^^^^^^^^^^^^^^^            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^          ^^^             ^^^^^^^^^^            ^^^^^^^^^^            ^^      ^^     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^          ^^^             ^^^^^^^^^^            ^^^^^^^^^^            ^^      ^^     ^^^^^^^^^^^^^^^^^^^^^^^            ^^^^^^^^^^^^^^^^^^^^^^^^^          ^^^             ^^^^^^^            ^^^^^^^^^^            ^^      ^^     ^^^^^^^^^^^^^^^^^^^^            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^         ^^^     ^^^^^^^^^^     ^^      ^^   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^       ^^^   ^^^^^^^^^         ^^^     ^^^^^^^^^^     ^^      ^^   ^^^^^^^^^^^^^^^^^^^^^^^^       ^^^   ^^^^^^^^^^^^^^^^^^^^^^^^^^         ^^^     ^^^^^^^^^^     ^^      ^^   ^^^^^^^^^^^^^^^^^^^^^^^^       ^^^   ^^^^^^^^^^^^^^^^^^^^     ^^^^^^^^^^     ^^^      ^^   ^^^      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^      ^^      ^^     ^^      ^^   ^^^      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^             ^^^^^^^^^^         ^^^      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^        ^^^    ^^^^^^^^     ^^^^^^^^^^     ^^      ^^     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^    ^^^^^     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+>src2 : { [x: number]: number; toString: () => string; toLocaleString: { (): string; (locales: string | string[], options?: Intl.NumberFormatOptions & Intl.DateTimeFormatOptions): string; }; pop: () => number; push: (...items: number[]) => number; concat: { (...items: ConcatArray<number>[]): number[]; (...items: (number | ConcatArray<number>)[]): number[]; }; join: (separator?: string) => string; reverse: () => number[]; shift: () => number; slice: (start?: number, end?: number) => number[]; sort: (compareFn?: (a: number, b: number) => number) => number[]; splice: { (start: number, deleteCount?: number): number[]; (start: number, deleteCount: number, ...items: number[]): number[]; }; unshift: (...items: number[]) => number; indexOf: (searchElement: number, fromIndex?: number) => number; lastIndexOf: (searchElement: number, fromIndex?: number) => number; every: { <S extends number>(predicate: (value: number, index: number, array: number[]) => value is S, thisArg?: any): this is S[]; (predicate: (value: number, index: number, array: number[]) => unknown, thisArg?: any): boolean; }; some: (predicate: (value: number, index: number, array: number[]) => unknown, thisArg?: any) => boolean; forEach: (callbackfn: (value: number, index: number, array: number[]) => void, thisArg?: any) => void; map: <U>(callbackfn: (value: number, index: number, array: number[]) => U, thisArg?: any) => U[]; filter: { <S_1 extends number>(predicate: (value: number, index: number, array: number[]) => value is S_1, thisArg?: any): S_1[]; (predicate: (value: number, index: number, array: number[]) => unknown, thisArg?: any): number[]; }; reduce: { (callbackfn: (previousValue: number, currentValue: number, currentIndex: number, array: number[]) => number): number; (callbackfn: (previousValue: number, currentValue: number, currentIndex: number, array: number[]) => number, initialValue: number): number; <U_1>(callbackfn: (previousValue: U_1, currentValue: number, currentIndex: number, array: number[]) => U_1, initialValue: U_1): U_1; }; reduceRight: { (callbackfn: (previousValue: number, currentValue: number, currentIndex: number, array: number[]) => number): number; (callbackfn: (previousValue: number, currentValue: number, currentIndex: number, array: number[]) => number, initialValue: number): number; <U_2>(callbackfn: (previousValue: U_2, currentValue: number, currentIndex: number, array: number[]) => U_2, initialValue: U_2): U_2; }; find: { <S_2 extends number>(predicate: (value: number, index: number, obj: number[]) => value is S_2, thisArg?: any): S_2; (predicate: (value: number, index: number, obj: number[]) => unknown, thisArg?: any): number; }; findIndex: (predicate: (value: number, index: number, obj: number[]) => unknown, thisArg?: any) => number; fill: (value: number, start?: number, end?: number) => number[]; copyWithin: (target: number, start: number, end?: number) => number[]; entries: () => BuiltinIterator<[number, number], void, undefined>; keys: () => BuiltinIterator<number, void, undefined>; values: () => BuiltinIterator<number, void, undefined>; includes: (searchElement: number, fromIndex?: number) => boolean; flatMap: <U_3, This = undefined>(callback: (this: This, value: number, index: number, array: number[]) => U_3 | readonly U_3[], thisArg?: This) => U_3[]; flat: <A, D extends number = 1>(this: A, depth?: D) => FlatArray<A, D>[]; [Symbol.iterator]: () => BuiltinIterator<number, void, undefined>; readonly [Symbol.unscopables]: { [x: number]: boolean; length?: boolean; toString?: boolean; toLocaleString?: boolean; pop?: boolean; push?: boolean; concat?: boolean; join?: boolean; reverse?: boolean; shift?: boolean; slice?: boolean; sort?: boolean; splice?: boolean; unshift?: boolean; indexOf?: boolean; lastIndexOf?: boolean; every?: boolean; some?: boolean; forEach?: boolean; map?: boolean; filter?: boolean; reduce?: boolean; reduceRight?: boolean; find?: boolean; findIndex?: boolean; fill?: boolean; copyWithin?: boolean; entries?: boolean; keys?: boolean; values?: boolean; includes?: boolean; flatMap?: boolean; flat?: boolean; [Symbol.iterator]?: boolean; readonly [Symbol.unscopables]?: boolean; }; }
+>     : ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^       ^^                 ^^       ^^^                                                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^         ^^^      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^     ^^^      ^^   ^^^      ^^^^^^^^^^^^^^^^^^^^^^         ^^^^ ^^^^^^^^^^ ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^     ^^      ^^           ^^^      ^^^^^^^^^^^^^^     ^^      ^^           ^^      ^^^^^     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^             ^^^^^^^^^^         ^^^      ^^^^^^^^^^^^^^^^^^^^^^^^^^^             ^^^^^^^^^^         ^^^      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^         ^^^     ^^^^^^^^^^     ^^      ^^     ^^^^^^^^^^^^^^^^^^^^^^^^^^^       ^^^   ^^^^^^^^^^^^^^^^^         ^^^     ^^^^^^^^^^     ^^      ^^     ^^^^^^^^^^^^^^^^^^^^^^^^       ^^^   ^^^^^^^^^^^^^^^^^^^^^^         ^^^     ^^^^^^^^^^     ^^      ^^     ^^^^^^^^^^^^^^^^^^^^^^^^       ^^^   ^^^^^^^^^^^^^^^^^^^^^^^^          ^^^     ^^^^^^^^^^     ^^      ^^     ^^^^^^^^^^^^^^^^^^^^^       ^^^   ^^^^^^^^^^^^^^^^^^^^          ^^^     ^^^^^^^^^^     ^^      ^^     ^^^^^^^^^^^^^^^^^^       ^^^   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^         ^^^     ^^^^^^^^^^     ^^      ^^     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^       ^^^   ^^^^^^^^^^^         ^^^     ^^^^^^^^^^     ^^      ^^     ^^^^^^^^^^^^^^^^^^^^^^^^       ^^^   ^^^^^^^^^^^^^^^^^^^^^^^^^^^          ^^^             ^^^^^^^^^^            ^^^^^^^^^^            ^^      ^^     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^          ^^^             ^^^^^^^^^^            ^^^^^^^^^^            ^^      ^^     ^^^^^^^^^^^^^^^^^^^^^^^            ^^^^^^^^^^^^^^^^^^^^^^^^^          ^^^             ^^^^^^^            ^^^^^^^^^^            ^^      ^^     ^^^^^^^^^^^^^^^^^^^^            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^          ^^^             ^^^^^^^^^^            ^^^^^^^^^^            ^^      ^^     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^          ^^^             ^^^^^^^^^^            ^^^^^^^^^^            ^^      ^^     ^^^^^^^^^^^^^^^^^^^^^^^            ^^^^^^^^^^^^^^^^^^^^^^^^^          ^^^             ^^^^^^^            ^^^^^^^^^^            ^^      ^^     ^^^^^^^^^^^^^^^^^^^^            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^         ^^^     ^^^^^^^^^^     ^^      ^^   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^       ^^^   ^^^^^^^^^         ^^^     ^^^^^^^^^^     ^^      ^^   ^^^^^^^^^^^^^^^^^^^^^^^^       ^^^   ^^^^^^^^^^^^^^^^^^^^^^^^^^         ^^^     ^^^^^^^^^^     ^^      ^^   ^^^^^^^^^^^^^^^^^^^^^^^^       ^^^   ^^^^^^^^^^^^^^^^^^^^     ^^^^^^^^^^     ^^^      ^^   ^^^      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^      ^^      ^^     ^^      ^^   ^^^      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^             ^^^^^^^^^^         ^^^      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^        ^^^    ^^^^^^^^     ^^^^^^^^^^     ^^      ^^     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^    ^^^^^     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
diff --git a/tests/baselines/reference/mappedTypeWithAsClauseAndLateBoundProperty2.js b/tests/baselines/reference/mappedTypeWithAsClauseAndLateBoundProperty2.js
index d4b703bce8ee4..2ab5b3b04ff78 100644
--- a/tests/baselines/reference/mappedTypeWithAsClauseAndLateBoundProperty2.js
+++ b/tests/baselines/reference/mappedTypeWithAsClauseAndLateBoundProperty2.js
@@ -62,13 +62,13 @@ export declare const thing: {
     findIndex: (predicate: (value: number, index: number, obj: number[]) => unknown, thisArg?: any) => number;
     fill: (value: number, start?: number, end?: number) => number[];
     copyWithin: (target: number, start: number, end?: number) => number[];
-    entries: () => IterableIterator<[number, number]>;
-    keys: () => IterableIterator<number>;
-    values: () => IterableIterator<number>;
+    entries: () => BuiltinIterator<[number, number], void, undefined>;
+    keys: () => BuiltinIterator<number, void, undefined>;
+    values: () => BuiltinIterator<number, void, undefined>;
     includes: (searchElement: number, fromIndex?: number) => boolean;
     flatMap: <U_3, This = undefined>(callback: (this: This, value: number, index: number, array: number[]) => U_3 | readonly U_3[], thisArg?: This) => U_3[];
     flat: <A, D extends number = 1>(this: A, depth?: D) => FlatArray<A, D>[];
-    [Symbol.iterator]: () => IterableIterator<number>;
+    [Symbol.iterator]: () => BuiltinIterator<number, void, undefined>;
     readonly [Symbol.unscopables]: {
         [x: number]: boolean;
         length?: boolean;
@@ -171,13 +171,13 @@ mappedTypeWithAsClauseAndLateBoundProperty2.d.ts(27,118): error TS2526: A 'this'
         findIndex: (predicate: (value: number, index: number, obj: number[]) => unknown, thisArg?: any) => number;
         fill: (value: number, start?: number, end?: number) => number[];
         copyWithin: (target: number, start: number, end?: number) => number[];
-        entries: () => IterableIterator<[number, number]>;
-        keys: () => IterableIterator<number>;
-        values: () => IterableIterator<number>;
+        entries: () => BuiltinIterator<[number, number], void, undefined>;
+        keys: () => BuiltinIterator<number, void, undefined>;
+        values: () => BuiltinIterator<number, void, undefined>;
         includes: (searchElement: number, fromIndex?: number) => boolean;
         flatMap: <U_3, This = undefined>(callback: (this: This, value: number, index: number, array: number[]) => U_3 | readonly U_3[], thisArg?: This) => U_3[];
         flat: <A, D extends number = 1>(this: A, depth?: D) => FlatArray<A, D>[];
-        [Symbol.iterator]: () => IterableIterator<number>;
+        [Symbol.iterator]: () => BuiltinIterator<number, void, undefined>;
         readonly [Symbol.unscopables]: {
             [x: number]: boolean;
             length?: boolean;
diff --git a/tests/baselines/reference/mappedTypeWithAsClauseAndLateBoundProperty2.types b/tests/baselines/reference/mappedTypeWithAsClauseAndLateBoundProperty2.types
index 3389007ec4d34..fee4861089790 100644
--- a/tests/baselines/reference/mappedTypeWithAsClauseAndLateBoundProperty2.types
+++ b/tests/baselines/reference/mappedTypeWithAsClauseAndLateBoundProperty2.types
@@ -2,11 +2,11 @@
 
 === mappedTypeWithAsClauseAndLateBoundProperty2.ts ===
 export const thing = (null as any as { [K in keyof number[] as Exclude<K, "length">]: (number[])[K] });
->thing : { [x: number]: number; toString: () => string; toLocaleString: { (): string; (locales: string | string[], options?: Intl.NumberFormatOptions & Intl.DateTimeFormatOptions): string; }; pop: () => number; push: (...items: number[]) => number; concat: { (...items: ConcatArray<number>[]): number[]; (...items: (number | ConcatArray<number>)[]): number[]; }; join: (separator?: string) => string; reverse: () => number[]; shift: () => number; slice: (start?: number, end?: number) => number[]; sort: (compareFn?: (a: number, b: number) => number) => number[]; splice: { (start: number, deleteCount?: number): number[]; (start: number, deleteCount: number, ...items: number[]): number[]; }; unshift: (...items: number[]) => number; indexOf: (searchElement: number, fromIndex?: number) => number; lastIndexOf: (searchElement: number, fromIndex?: number) => number; every: { <S extends number>(predicate: (value: number, index: number, array: number[]) => value is S, thisArg?: any): this is S[]; (predicate: (value: number, index: number, array: number[]) => unknown, thisArg?: any): boolean; }; some: (predicate: (value: number, index: number, array: number[]) => unknown, thisArg?: any) => boolean; forEach: (callbackfn: (value: number, index: number, array: number[]) => void, thisArg?: any) => void; map: <U>(callbackfn: (value: number, index: number, array: number[]) => U, thisArg?: any) => U[]; filter: { <S_1 extends number>(predicate: (value: number, index: number, array: number[]) => value is S_1, thisArg?: any): S_1[]; (predicate: (value: number, index: number, array: number[]) => unknown, thisArg?: any): number[]; }; reduce: { (callbackfn: (previousValue: number, currentValue: number, currentIndex: number, array: number[]) => number): number; (callbackfn: (previousValue: number, currentValue: number, currentIndex: number, array: number[]) => number, initialValue: number): number; <U_1>(callbackfn: (previousValue: U_1, currentValue: number, currentIndex: number, array: number[]) => U_1, initialValue: U_1): U_1; }; reduceRight: { (callbackfn: (previousValue: number, currentValue: number, currentIndex: number, array: number[]) => number): number; (callbackfn: (previousValue: number, currentValue: number, currentIndex: number, array: number[]) => number, initialValue: number): number; <U_2>(callbackfn: (previousValue: U_2, currentValue: number, currentIndex: number, array: number[]) => U_2, initialValue: U_2): U_2; }; find: { <S_2 extends number>(predicate: (value: number, index: number, obj: number[]) => value is S_2, thisArg?: any): S_2; (predicate: (value: number, index: number, obj: number[]) => unknown, thisArg?: any): number; }; findIndex: (predicate: (value: number, index: number, obj: number[]) => unknown, thisArg?: any) => number; fill: (value: number, start?: number, end?: number) => number[]; copyWithin: (target: number, start: number, end?: number) => number[]; entries: () => IterableIterator<[number, number]>; keys: () => IterableIterator<number>; values: () => IterableIterator<number>; includes: (searchElement: number, fromIndex?: number) => boolean; flatMap: <U_3, This = undefined>(callback: (this: This, value: number, index: number, array: number[]) => U_3 | readonly U_3[], thisArg?: This) => U_3[]; flat: <A, D extends number = 1>(this: A, depth?: D) => FlatArray<A, D>[]; [Symbol.iterator]: () => IterableIterator<number>; readonly [Symbol.unscopables]: { [x: number]: boolean; length?: boolean; toString?: boolean; toLocaleString?: boolean; pop?: boolean; push?: boolean; concat?: boolean; join?: boolean; reverse?: boolean; shift?: boolean; slice?: boolean; sort?: boolean; splice?: boolean; unshift?: boolean; indexOf?: boolean; lastIndexOf?: boolean; every?: boolean; some?: boolean; forEach?: boolean; map?: boolean; filter?: boolean; reduce?: boolean; reduceRight?: boolean; find?: boolean; findIndex?: boolean; fill?: boolean; copyWithin?: boolean; entries?: boolean; keys?: boolean; values?: boolean; includes?: boolean; flatMap?: boolean; flat?: boolean; [Symbol.iterator]?: boolean; readonly [Symbol.unscopables]?: boolean; }; }
->      : ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^       ^^                 ^^       ^^^                                                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^         ^^^      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^     ^^^      ^^   ^^^      ^^^^^^^^^^^^^^^^^^^^^^         ^^^^ ^^^^^^^^^^ ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^     ^^      ^^           ^^^      ^^^^^^^^^^^^^^     ^^      ^^           ^^      ^^^^^     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^             ^^^^^^^^^^         ^^^      ^^^^^^^^^^^^^^^^^^^^^^^^^^^             ^^^^^^^^^^         ^^^      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^         ^^^     ^^^^^^^^^^     ^^      ^^     ^^^^^^^^^^^^^^^^^^^^^^^^^^^       ^^^   ^^^^^^^^^^^^^^^^^         ^^^     ^^^^^^^^^^     ^^      ^^     ^^^^^^^^^^^^^^^^^^^^^^^^       ^^^   ^^^^^^^^^^^^^^^^^^^^^^         ^^^     ^^^^^^^^^^     ^^      ^^     ^^^^^^^^^^^^^^^^^^^^^^^^       ^^^   ^^^^^^^^^^^^^^^^^^^^^^^^          ^^^     ^^^^^^^^^^     ^^      ^^     ^^^^^^^^^^^^^^^^^^^^^       ^^^   ^^^^^^^^^^^^^^^^^^^^          ^^^     ^^^^^^^^^^     ^^      ^^     ^^^^^^^^^^^^^^^^^^       ^^^   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^         ^^^     ^^^^^^^^^^     ^^      ^^     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^       ^^^   ^^^^^^^^^^^         ^^^     ^^^^^^^^^^     ^^      ^^     ^^^^^^^^^^^^^^^^^^^^^^^^       ^^^   ^^^^^^^^^^^^^^^^^^^^^^^^^^^          ^^^             ^^^^^^^^^^            ^^^^^^^^^^            ^^      ^^     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^          ^^^             ^^^^^^^^^^            ^^^^^^^^^^            ^^      ^^     ^^^^^^^^^^^^^^^^^^^^^^^            ^^^^^^^^^^^^^^^^^^^^^^^^^          ^^^             ^^^^^^^            ^^^^^^^^^^            ^^      ^^     ^^^^^^^^^^^^^^^^^^^^            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^          ^^^             ^^^^^^^^^^            ^^^^^^^^^^            ^^      ^^     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^          ^^^             ^^^^^^^^^^            ^^^^^^^^^^            ^^      ^^     ^^^^^^^^^^^^^^^^^^^^^^^            ^^^^^^^^^^^^^^^^^^^^^^^^^          ^^^             ^^^^^^^            ^^^^^^^^^^            ^^      ^^     ^^^^^^^^^^^^^^^^^^^^            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^         ^^^     ^^^^^^^^^^     ^^      ^^   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^       ^^^   ^^^^^^^^^         ^^^     ^^^^^^^^^^     ^^      ^^   ^^^^^^^^^^^^^^^^^^^^^^^^       ^^^   ^^^^^^^^^^^^^^^^^^^^^^^^^^         ^^^     ^^^^^^^^^^     ^^      ^^   ^^^^^^^^^^^^^^^^^^^^^^^^       ^^^   ^^^^^^^^^^^^^^^^^^^^     ^^^^^^^^^^     ^^^      ^^   ^^^      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^      ^^      ^^     ^^      ^^   ^^^      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^             ^^^^^^^^^^         ^^^      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^        ^^^    ^^^^^^^^     ^^^^^^^^^^     ^^      ^^     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^    ^^^^^     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
->(null as any as { [K in keyof number[] as Exclude<K, "length">]: (number[])[K] }) : { [x: number]: number; toString: () => string; toLocaleString: { (): string; (locales: string | string[], options?: Intl.NumberFormatOptions & Intl.DateTimeFormatOptions): string; }; pop: () => number; push: (...items: number[]) => number; concat: { (...items: ConcatArray<number>[]): number[]; (...items: (number | ConcatArray<number>)[]): number[]; }; join: (separator?: string) => string; reverse: () => number[]; shift: () => number; slice: (start?: number, end?: number) => number[]; sort: (compareFn?: (a: number, b: number) => number) => number[]; splice: { (start: number, deleteCount?: number): number[]; (start: number, deleteCount: number, ...items: number[]): number[]; }; unshift: (...items: number[]) => number; indexOf: (searchElement: number, fromIndex?: number) => number; lastIndexOf: (searchElement: number, fromIndex?: number) => number; every: { <S extends number>(predicate: (value: number, index: number, array: number[]) => value is S, thisArg?: any): this is S[]; (predicate: (value: number, index: number, array: number[]) => unknown, thisArg?: any): boolean; }; some: (predicate: (value: number, index: number, array: number[]) => unknown, thisArg?: any) => boolean; forEach: (callbackfn: (value: number, index: number, array: number[]) => void, thisArg?: any) => void; map: <U>(callbackfn: (value: number, index: number, array: number[]) => U, thisArg?: any) => U[]; filter: { <S_1 extends number>(predicate: (value: number, index: number, array: number[]) => value is S_1, thisArg?: any): S_1[]; (predicate: (value: number, index: number, array: number[]) => unknown, thisArg?: any): number[]; }; reduce: { (callbackfn: (previousValue: number, currentValue: number, currentIndex: number, array: number[]) => number): number; (callbackfn: (previousValue: number, currentValue: number, currentIndex: number, array: number[]) => number, initialValue: number): number; <U_1>(callbackfn: (previousValue: U_1, currentValue: number, currentIndex: number, array: number[]) => U_1, initialValue: U_1): U_1; }; reduceRight: { (callbackfn: (previousValue: number, currentValue: number, currentIndex: number, array: number[]) => number): number; (callbackfn: (previousValue: number, currentValue: number, currentIndex: number, array: number[]) => number, initialValue: number): number; <U_2>(callbackfn: (previousValue: U_2, currentValue: number, currentIndex: number, array: number[]) => U_2, initialValue: U_2): U_2; }; find: { <S_2 extends number>(predicate: (value: number, index: number, obj: number[]) => value is S_2, thisArg?: any): S_2; (predicate: (value: number, index: number, obj: number[]) => unknown, thisArg?: any): number; }; findIndex: (predicate: (value: number, index: number, obj: number[]) => unknown, thisArg?: any) => number; fill: (value: number, start?: number, end?: number) => number[]; copyWithin: (target: number, start: number, end?: number) => number[]; entries: () => IterableIterator<[number, number]>; keys: () => IterableIterator<number>; values: () => IterableIterator<number>; includes: (searchElement: number, fromIndex?: number) => boolean; flatMap: <U_3, This = undefined>(callback: (this: This, value: number, index: number, array: number[]) => U_3 | readonly U_3[], thisArg?: This) => U_3[]; flat: <A, D extends number = 1>(this: A, depth?: D) => FlatArray<A, D>[]; [Symbol.iterator]: () => IterableIterator<number>; readonly [Symbol.unscopables]: { [x: number]: boolean; length?: boolean; toString?: boolean; toLocaleString?: boolean; pop?: boolean; push?: boolean; concat?: boolean; join?: boolean; reverse?: boolean; shift?: boolean; slice?: boolean; sort?: boolean; splice?: boolean; unshift?: boolean; indexOf?: boolean; lastIndexOf?: boolean; every?: boolean; some?: boolean; forEach?: boolean; map?: boolean; filter?: boolean; reduce?: boolean; reduceRight?: boolean; find?: boolean; findIndex?: boolean; fill?: boolean; copyWithin?: boolean; entries?: boolean; keys?: boolean; values?: boolean; includes?: boolean; flatMap?: boolean; flat?: boolean; [Symbol.iterator]?: boolean; readonly [Symbol.unscopables]?: boolean; }; }
->                                                                                  :                                                                                                                  ^                                                                                               ^^^                                       ^^^                                          ^^^                                                                       ^                                                                                ^             ^                                       ^                                                                                      ^                                                          ^^^                                         ^^^                                                                      ^                                                                   ^                                                                                                                                  ^                                                                                                    ^                                                                                                         ^                                                                                                         ^                                                                                                  ^                                                                                                                                 ^                                                                                              ^                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                ^                                                                                          ^                                                                                                           ^                                             ^             ^                                                                      ^                                                                                                                                                                                                   ^                                                                                                                                                             ^                                                                ^                                                                                                                                           ^                   ^                         ^              ^               ^                 ^               ^                  ^                ^                ^               ^                 ^                  ^                  ^                      ^                ^               ^                  ^              ^                 ^                 ^                      ^               ^                    ^               ^                     ^                  ^               ^                 ^                   ^                  ^               ^                            ^                                        ^               
->null as any as { [K in keyof number[] as Exclude<K, "length">]: (number[])[K] } : { [x: number]: number; toString: () => string; toLocaleString: { (): string; (locales: string | string[], options?: Intl.NumberFormatOptions & Intl.DateTimeFormatOptions): string; }; pop: () => number; push: (...items: number[]) => number; concat: { (...items: ConcatArray<number>[]): number[]; (...items: (number | ConcatArray<number>)[]): number[]; }; join: (separator?: string) => string; reverse: () => number[]; shift: () => number; slice: (start?: number, end?: number) => number[]; sort: (compareFn?: (a: number, b: number) => number) => number[]; splice: { (start: number, deleteCount?: number): number[]; (start: number, deleteCount: number, ...items: number[]): number[]; }; unshift: (...items: number[]) => number; indexOf: (searchElement: number, fromIndex?: number) => number; lastIndexOf: (searchElement: number, fromIndex?: number) => number; every: { <S extends number>(predicate: (value: number, index: number, array: number[]) => value is S, thisArg?: any): this is S[]; (predicate: (value: number, index: number, array: number[]) => unknown, thisArg?: any): boolean; }; some: (predicate: (value: number, index: number, array: number[]) => unknown, thisArg?: any) => boolean; forEach: (callbackfn: (value: number, index: number, array: number[]) => void, thisArg?: any) => void; map: <U>(callbackfn: (value: number, index: number, array: number[]) => U, thisArg?: any) => U[]; filter: { <S_1 extends number>(predicate: (value: number, index: number, array: number[]) => value is S_1, thisArg?: any): S_1[]; (predicate: (value: number, index: number, array: number[]) => unknown, thisArg?: any): number[]; }; reduce: { (callbackfn: (previousValue: number, currentValue: number, currentIndex: number, array: number[]) => number): number; (callbackfn: (previousValue: number, currentValue: number, currentIndex: number, array: number[]) => number, initialValue: number): number; <U_1>(callbackfn: (previousValue: U_1, currentValue: number, currentIndex: number, array: number[]) => U_1, initialValue: U_1): U_1; }; reduceRight: { (callbackfn: (previousValue: number, currentValue: number, currentIndex: number, array: number[]) => number): number; (callbackfn: (previousValue: number, currentValue: number, currentIndex: number, array: number[]) => number, initialValue: number): number; <U_2>(callbackfn: (previousValue: U_2, currentValue: number, currentIndex: number, array: number[]) => U_2, initialValue: U_2): U_2; }; find: { <S_2 extends number>(predicate: (value: number, index: number, obj: number[]) => value is S_2, thisArg?: any): S_2; (predicate: (value: number, index: number, obj: number[]) => unknown, thisArg?: any): number; }; findIndex: (predicate: (value: number, index: number, obj: number[]) => unknown, thisArg?: any) => number; fill: (value: number, start?: number, end?: number) => number[]; copyWithin: (target: number, start: number, end?: number) => number[]; entries: () => IterableIterator<[number, number]>; keys: () => IterableIterator<number>; values: () => IterableIterator<number>; includes: (searchElement: number, fromIndex?: number) => boolean; flatMap: <U_3, This = undefined>(callback: (this: This, value: number, index: number, array: number[]) => U_3 | readonly U_3[], thisArg?: This) => U_3[]; flat: <A, D extends number = 1>(this: A, depth?: D) => FlatArray<A, D>[]; [Symbol.iterator]: () => IterableIterator<number>; readonly [Symbol.unscopables]: { [x: number]: boolean; length?: boolean; toString?: boolean; toLocaleString?: boolean; pop?: boolean; push?: boolean; concat?: boolean; join?: boolean; reverse?: boolean; shift?: boolean; slice?: boolean; sort?: boolean; splice?: boolean; unshift?: boolean; indexOf?: boolean; lastIndexOf?: boolean; every?: boolean; some?: boolean; forEach?: boolean; map?: boolean; filter?: boolean; reduce?: boolean; reduceRight?: boolean; find?: boolean; findIndex?: boolean; fill?: boolean; copyWithin?: boolean; entries?: boolean; keys?: boolean; values?: boolean; includes?: boolean; flatMap?: boolean; flat?: boolean; [Symbol.iterator]?: boolean; readonly [Symbol.unscopables]?: boolean; }; }
->                                                                                : ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^       ^^                 ^^       ^^^                                                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^         ^^^      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^     ^^^      ^^   ^^^      ^^^^^^^^^^^^^^^^^^^^^^         ^^^^ ^^^^^^^^^^ ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^     ^^      ^^           ^^^      ^^^^^^^^^^^^^^     ^^      ^^           ^^      ^^^^^     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^             ^^^^^^^^^^         ^^^      ^^^^^^^^^^^^^^^^^^^^^^^^^^^             ^^^^^^^^^^         ^^^      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^         ^^^     ^^^^^^^^^^     ^^      ^^     ^^^^^^^^^^^^^^^^^^^^^^^^^^^       ^^^   ^^^^^^^^^^^^^^^^^         ^^^     ^^^^^^^^^^     ^^      ^^     ^^^^^^^^^^^^^^^^^^^^^^^^       ^^^   ^^^^^^^^^^^^^^^^^^^^^^         ^^^     ^^^^^^^^^^     ^^      ^^     ^^^^^^^^^^^^^^^^^^^^^^^^       ^^^   ^^^^^^^^^^^^^^^^^^^^^^^^          ^^^     ^^^^^^^^^^     ^^      ^^     ^^^^^^^^^^^^^^^^^^^^^       ^^^   ^^^^^^^^^^^^^^^^^^^^          ^^^     ^^^^^^^^^^     ^^      ^^     ^^^^^^^^^^^^^^^^^^       ^^^   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^         ^^^     ^^^^^^^^^^     ^^      ^^     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^       ^^^   ^^^^^^^^^^^         ^^^     ^^^^^^^^^^     ^^      ^^     ^^^^^^^^^^^^^^^^^^^^^^^^       ^^^   ^^^^^^^^^^^^^^^^^^^^^^^^^^^          ^^^             ^^^^^^^^^^            ^^^^^^^^^^            ^^      ^^     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^          ^^^             ^^^^^^^^^^            ^^^^^^^^^^            ^^      ^^     ^^^^^^^^^^^^^^^^^^^^^^^            ^^^^^^^^^^^^^^^^^^^^^^^^^          ^^^             ^^^^^^^            ^^^^^^^^^^            ^^      ^^     ^^^^^^^^^^^^^^^^^^^^            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^          ^^^             ^^^^^^^^^^            ^^^^^^^^^^            ^^      ^^     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^          ^^^             ^^^^^^^^^^            ^^^^^^^^^^            ^^      ^^     ^^^^^^^^^^^^^^^^^^^^^^^            ^^^^^^^^^^^^^^^^^^^^^^^^^          ^^^             ^^^^^^^            ^^^^^^^^^^            ^^      ^^     ^^^^^^^^^^^^^^^^^^^^            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^         ^^^     ^^^^^^^^^^     ^^      ^^   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^       ^^^   ^^^^^^^^^         ^^^     ^^^^^^^^^^     ^^      ^^   ^^^^^^^^^^^^^^^^^^^^^^^^       ^^^   ^^^^^^^^^^^^^^^^^^^^^^^^^^         ^^^     ^^^^^^^^^^     ^^      ^^   ^^^^^^^^^^^^^^^^^^^^^^^^       ^^^   ^^^^^^^^^^^^^^^^^^^^     ^^^^^^^^^^     ^^^      ^^   ^^^      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^      ^^      ^^     ^^      ^^   ^^^      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^             ^^^^^^^^^^         ^^^      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^        ^^^    ^^^^^^^^     ^^^^^^^^^^     ^^      ^^     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^    ^^^^^     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+>thing : { [x: number]: number; toString: () => string; toLocaleString: { (): string; (locales: string | string[], options?: Intl.NumberFormatOptions & Intl.DateTimeFormatOptions): string; }; pop: () => number; push: (...items: number[]) => number; concat: { (...items: ConcatArray<number>[]): number[]; (...items: (number | ConcatArray<number>)[]): number[]; }; join: (separator?: string) => string; reverse: () => number[]; shift: () => number; slice: (start?: number, end?: number) => number[]; sort: (compareFn?: (a: number, b: number) => number) => number[]; splice: { (start: number, deleteCount?: number): number[]; (start: number, deleteCount: number, ...items: number[]): number[]; }; unshift: (...items: number[]) => number; indexOf: (searchElement: number, fromIndex?: number) => number; lastIndexOf: (searchElement: number, fromIndex?: number) => number; every: { <S extends number>(predicate: (value: number, index: number, array: number[]) => value is S, thisArg?: any): this is S[]; (predicate: (value: number, index: number, array: number[]) => unknown, thisArg?: any): boolean; }; some: (predicate: (value: number, index: number, array: number[]) => unknown, thisArg?: any) => boolean; forEach: (callbackfn: (value: number, index: number, array: number[]) => void, thisArg?: any) => void; map: <U>(callbackfn: (value: number, index: number, array: number[]) => U, thisArg?: any) => U[]; filter: { <S_1 extends number>(predicate: (value: number, index: number, array: number[]) => value is S_1, thisArg?: any): S_1[]; (predicate: (value: number, index: number, array: number[]) => unknown, thisArg?: any): number[]; }; reduce: { (callbackfn: (previousValue: number, currentValue: number, currentIndex: number, array: number[]) => number): number; (callbackfn: (previousValue: number, currentValue: number, currentIndex: number, array: number[]) => number, initialValue: number): number; <U_1>(callbackfn: (previousValue: U_1, currentValue: number, currentIndex: number, array: number[]) => U_1, initialValue: U_1): U_1; }; reduceRight: { (callbackfn: (previousValue: number, currentValue: number, currentIndex: number, array: number[]) => number): number; (callbackfn: (previousValue: number, currentValue: number, currentIndex: number, array: number[]) => number, initialValue: number): number; <U_2>(callbackfn: (previousValue: U_2, currentValue: number, currentIndex: number, array: number[]) => U_2, initialValue: U_2): U_2; }; find: { <S_2 extends number>(predicate: (value: number, index: number, obj: number[]) => value is S_2, thisArg?: any): S_2; (predicate: (value: number, index: number, obj: number[]) => unknown, thisArg?: any): number; }; findIndex: (predicate: (value: number, index: number, obj: number[]) => unknown, thisArg?: any) => number; fill: (value: number, start?: number, end?: number) => number[]; copyWithin: (target: number, start: number, end?: number) => number[]; entries: () => BuiltinIterator<[number, number], void, undefined>; keys: () => BuiltinIterator<number, void, undefined>; values: () => BuiltinIterator<number, void, undefined>; includes: (searchElement: number, fromIndex?: number) => boolean; flatMap: <U_3, This = undefined>(callback: (this: This, value: number, index: number, array: number[]) => U_3 | readonly U_3[], thisArg?: This) => U_3[]; flat: <A, D extends number = 1>(this: A, depth?: D) => FlatArray<A, D>[]; [Symbol.iterator]: () => BuiltinIterator<number, void, undefined>; readonly [Symbol.unscopables]: { [x: number]: boolean; length?: boolean; toString?: boolean; toLocaleString?: boolean; pop?: boolean; push?: boolean; concat?: boolean; join?: boolean; reverse?: boolean; shift?: boolean; slice?: boolean; sort?: boolean; splice?: boolean; unshift?: boolean; indexOf?: boolean; lastIndexOf?: boolean; every?: boolean; some?: boolean; forEach?: boolean; map?: boolean; filter?: boolean; reduce?: boolean; reduceRight?: boolean; find?: boolean; findIndex?: boolean; fill?: boolean; copyWithin?: boolean; entries?: boolean; keys?: boolean; values?: boolean; includes?: boolean; flatMap?: boolean; flat?: boolean; [Symbol.iterator]?: boolean; readonly [Symbol.unscopables]?: boolean; }; }
+>      : ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^       ^^                 ^^       ^^^                                                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^         ^^^      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^     ^^^      ^^   ^^^      ^^^^^^^^^^^^^^^^^^^^^^         ^^^^ ^^^^^^^^^^ ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^     ^^      ^^           ^^^      ^^^^^^^^^^^^^^     ^^      ^^           ^^      ^^^^^     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^             ^^^^^^^^^^         ^^^      ^^^^^^^^^^^^^^^^^^^^^^^^^^^             ^^^^^^^^^^         ^^^      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^         ^^^     ^^^^^^^^^^     ^^      ^^     ^^^^^^^^^^^^^^^^^^^^^^^^^^^       ^^^   ^^^^^^^^^^^^^^^^^         ^^^     ^^^^^^^^^^     ^^      ^^     ^^^^^^^^^^^^^^^^^^^^^^^^       ^^^   ^^^^^^^^^^^^^^^^^^^^^^         ^^^     ^^^^^^^^^^     ^^      ^^     ^^^^^^^^^^^^^^^^^^^^^^^^       ^^^   ^^^^^^^^^^^^^^^^^^^^^^^^          ^^^     ^^^^^^^^^^     ^^      ^^     ^^^^^^^^^^^^^^^^^^^^^       ^^^   ^^^^^^^^^^^^^^^^^^^^          ^^^     ^^^^^^^^^^     ^^      ^^     ^^^^^^^^^^^^^^^^^^       ^^^   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^         ^^^     ^^^^^^^^^^     ^^      ^^     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^       ^^^   ^^^^^^^^^^^         ^^^     ^^^^^^^^^^     ^^      ^^     ^^^^^^^^^^^^^^^^^^^^^^^^       ^^^   ^^^^^^^^^^^^^^^^^^^^^^^^^^^          ^^^             ^^^^^^^^^^            ^^^^^^^^^^            ^^      ^^     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^          ^^^             ^^^^^^^^^^            ^^^^^^^^^^            ^^      ^^     ^^^^^^^^^^^^^^^^^^^^^^^            ^^^^^^^^^^^^^^^^^^^^^^^^^          ^^^             ^^^^^^^            ^^^^^^^^^^            ^^      ^^     ^^^^^^^^^^^^^^^^^^^^            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^          ^^^             ^^^^^^^^^^            ^^^^^^^^^^            ^^      ^^     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^          ^^^             ^^^^^^^^^^            ^^^^^^^^^^            ^^      ^^     ^^^^^^^^^^^^^^^^^^^^^^^            ^^^^^^^^^^^^^^^^^^^^^^^^^          ^^^             ^^^^^^^            ^^^^^^^^^^            ^^      ^^     ^^^^^^^^^^^^^^^^^^^^            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^         ^^^     ^^^^^^^^^^     ^^      ^^   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^       ^^^   ^^^^^^^^^         ^^^     ^^^^^^^^^^     ^^      ^^   ^^^^^^^^^^^^^^^^^^^^^^^^       ^^^   ^^^^^^^^^^^^^^^^^^^^^^^^^^         ^^^     ^^^^^^^^^^     ^^      ^^   ^^^^^^^^^^^^^^^^^^^^^^^^       ^^^   ^^^^^^^^^^^^^^^^^^^^     ^^^^^^^^^^     ^^^      ^^   ^^^      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^      ^^      ^^     ^^      ^^   ^^^      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^             ^^^^^^^^^^         ^^^      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^        ^^^    ^^^^^^^^     ^^^^^^^^^^     ^^      ^^     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^    ^^^^^     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+>(null as any as { [K in keyof number[] as Exclude<K, "length">]: (number[])[K] }) : { [x: number]: number; toString: () => string; toLocaleString: { (): string; (locales: string | string[], options?: Intl.NumberFormatOptions & Intl.DateTimeFormatOptions): string; }; pop: () => number; push: (...items: number[]) => number; concat: { (...items: ConcatArray<number>[]): number[]; (...items: (number | ConcatArray<number>)[]): number[]; }; join: (separator?: string) => string; reverse: () => number[]; shift: () => number; slice: (start?: number, end?: number) => number[]; sort: (compareFn?: (a: number, b: number) => number) => number[]; splice: { (start: number, deleteCount?: number): number[]; (start: number, deleteCount: number, ...items: number[]): number[]; }; unshift: (...items: number[]) => number; indexOf: (searchElement: number, fromIndex?: number) => number; lastIndexOf: (searchElement: number, fromIndex?: number) => number; every: { <S extends number>(predicate: (value: number, index: number, array: number[]) => value is S, thisArg?: any): this is S[]; (predicate: (value: number, index: number, array: number[]) => unknown, thisArg?: any): boolean; }; some: (predicate: (value: number, index: number, array: number[]) => unknown, thisArg?: any) => boolean; forEach: (callbackfn: (value: number, index: number, array: number[]) => void, thisArg?: any) => void; map: <U>(callbackfn: (value: number, index: number, array: number[]) => U, thisArg?: any) => U[]; filter: { <S_1 extends number>(predicate: (value: number, index: number, array: number[]) => value is S_1, thisArg?: any): S_1[]; (predicate: (value: number, index: number, array: number[]) => unknown, thisArg?: any): number[]; }; reduce: { (callbackfn: (previousValue: number, currentValue: number, currentIndex: number, array: number[]) => number): number; (callbackfn: (previousValue: number, currentValue: number, currentIndex: number, array: number[]) => number, initialValue: number): number; <U_1>(callbackfn: (previousValue: U_1, currentValue: number, currentIndex: number, array: number[]) => U_1, initialValue: U_1): U_1; }; reduceRight: { (callbackfn: (previousValue: number, currentValue: number, currentIndex: number, array: number[]) => number): number; (callbackfn: (previousValue: number, currentValue: number, currentIndex: number, array: number[]) => number, initialValue: number): number; <U_2>(callbackfn: (previousValue: U_2, currentValue: number, currentIndex: number, array: number[]) => U_2, initialValue: U_2): U_2; }; find: { <S_2 extends number>(predicate: (value: number, index: number, obj: number[]) => value is S_2, thisArg?: any): S_2; (predicate: (value: number, index: number, obj: number[]) => unknown, thisArg?: any): number; }; findIndex: (predicate: (value: number, index: number, obj: number[]) => unknown, thisArg?: any) => number; fill: (value: number, start?: number, end?: number) => number[]; copyWithin: (target: number, start: number, end?: number) => number[]; entries: () => BuiltinIterator<[number, number], void, undefined>; keys: () => BuiltinIterator<number, void, undefined>; values: () => BuiltinIterator<number, void, undefined>; includes: (searchElement: number, fromIndex?: number) => boolean; flatMap: <U_3, This = undefined>(callback: (this: This, value: number, index: number, array: number[]) => U_3 | readonly U_3[], thisArg?: This) => U_3[]; flat: <A, D extends number = 1>(this: A, depth?: D) => FlatArray<A, D>[]; [Symbol.iterator]: () => BuiltinIterator<number, void, undefined>; readonly [Symbol.unscopables]: { [x: number]: boolean; length?: boolean; toString?: boolean; toLocaleString?: boolean; pop?: boolean; push?: boolean; concat?: boolean; join?: boolean; reverse?: boolean; shift?: boolean; slice?: boolean; sort?: boolean; splice?: boolean; unshift?: boolean; indexOf?: boolean; lastIndexOf?: boolean; every?: boolean; some?: boolean; forEach?: boolean; map?: boolean; filter?: boolean; reduce?: boolean; reduceRight?: boolean; find?: boolean; findIndex?: boolean; fill?: boolean; copyWithin?: boolean; entries?: boolean; keys?: boolean; values?: boolean; includes?: boolean; flatMap?: boolean; flat?: boolean; [Symbol.iterator]?: boolean; readonly [Symbol.unscopables]?: boolean; }; }
+>                                                                                  :                                                                                                                  ^                                                                                               ^^^                                       ^^^                                          ^^^                                                                       ^                                                                                ^             ^                                       ^                                                                                      ^                                                          ^^^                                         ^^^                                                                      ^                                                                   ^                                                                                                                                  ^                                                                                                    ^                                                                                                         ^                                                                                                         ^                                                                                                  ^                                                                                                                                 ^                                                                                              ^                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                ^                                                                                          ^                                                                                                           ^                                             ^             ^                                                                      ^                                                                                                                                                                                                                                                   ^                                                                                                                                                             ^                                                                ^                                                                                                                                                           ^                   ^                         ^              ^               ^                 ^               ^                  ^                ^                ^               ^                 ^                  ^                  ^                      ^                ^               ^                  ^              ^                 ^                 ^                      ^               ^                    ^               ^                     ^                  ^               ^                 ^                   ^                  ^               ^                            ^                                        ^               
+>null as any as { [K in keyof number[] as Exclude<K, "length">]: (number[])[K] } : { [x: number]: number; toString: () => string; toLocaleString: { (): string; (locales: string | string[], options?: Intl.NumberFormatOptions & Intl.DateTimeFormatOptions): string; }; pop: () => number; push: (...items: number[]) => number; concat: { (...items: ConcatArray<number>[]): number[]; (...items: (number | ConcatArray<number>)[]): number[]; }; join: (separator?: string) => string; reverse: () => number[]; shift: () => number; slice: (start?: number, end?: number) => number[]; sort: (compareFn?: (a: number, b: number) => number) => number[]; splice: { (start: number, deleteCount?: number): number[]; (start: number, deleteCount: number, ...items: number[]): number[]; }; unshift: (...items: number[]) => number; indexOf: (searchElement: number, fromIndex?: number) => number; lastIndexOf: (searchElement: number, fromIndex?: number) => number; every: { <S extends number>(predicate: (value: number, index: number, array: number[]) => value is S, thisArg?: any): this is S[]; (predicate: (value: number, index: number, array: number[]) => unknown, thisArg?: any): boolean; }; some: (predicate: (value: number, index: number, array: number[]) => unknown, thisArg?: any) => boolean; forEach: (callbackfn: (value: number, index: number, array: number[]) => void, thisArg?: any) => void; map: <U>(callbackfn: (value: number, index: number, array: number[]) => U, thisArg?: any) => U[]; filter: { <S_1 extends number>(predicate: (value: number, index: number, array: number[]) => value is S_1, thisArg?: any): S_1[]; (predicate: (value: number, index: number, array: number[]) => unknown, thisArg?: any): number[]; }; reduce: { (callbackfn: (previousValue: number, currentValue: number, currentIndex: number, array: number[]) => number): number; (callbackfn: (previousValue: number, currentValue: number, currentIndex: number, array: number[]) => number, initialValue: number): number; <U_1>(callbackfn: (previousValue: U_1, currentValue: number, currentIndex: number, array: number[]) => U_1, initialValue: U_1): U_1; }; reduceRight: { (callbackfn: (previousValue: number, currentValue: number, currentIndex: number, array: number[]) => number): number; (callbackfn: (previousValue: number, currentValue: number, currentIndex: number, array: number[]) => number, initialValue: number): number; <U_2>(callbackfn: (previousValue: U_2, currentValue: number, currentIndex: number, array: number[]) => U_2, initialValue: U_2): U_2; }; find: { <S_2 extends number>(predicate: (value: number, index: number, obj: number[]) => value is S_2, thisArg?: any): S_2; (predicate: (value: number, index: number, obj: number[]) => unknown, thisArg?: any): number; }; findIndex: (predicate: (value: number, index: number, obj: number[]) => unknown, thisArg?: any) => number; fill: (value: number, start?: number, end?: number) => number[]; copyWithin: (target: number, start: number, end?: number) => number[]; entries: () => BuiltinIterator<[number, number], void, undefined>; keys: () => BuiltinIterator<number, void, undefined>; values: () => BuiltinIterator<number, void, undefined>; includes: (searchElement: number, fromIndex?: number) => boolean; flatMap: <U_3, This = undefined>(callback: (this: This, value: number, index: number, array: number[]) => U_3 | readonly U_3[], thisArg?: This) => U_3[]; flat: <A, D extends number = 1>(this: A, depth?: D) => FlatArray<A, D>[]; [Symbol.iterator]: () => BuiltinIterator<number, void, undefined>; readonly [Symbol.unscopables]: { [x: number]: boolean; length?: boolean; toString?: boolean; toLocaleString?: boolean; pop?: boolean; push?: boolean; concat?: boolean; join?: boolean; reverse?: boolean; shift?: boolean; slice?: boolean; sort?: boolean; splice?: boolean; unshift?: boolean; indexOf?: boolean; lastIndexOf?: boolean; every?: boolean; some?: boolean; forEach?: boolean; map?: boolean; filter?: boolean; reduce?: boolean; reduceRight?: boolean; find?: boolean; findIndex?: boolean; fill?: boolean; copyWithin?: boolean; entries?: boolean; keys?: boolean; values?: boolean; includes?: boolean; flatMap?: boolean; flat?: boolean; [Symbol.iterator]?: boolean; readonly [Symbol.unscopables]?: boolean; }; }
+>                                                                                : ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^       ^^                 ^^       ^^^                                                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^         ^^^      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^     ^^^      ^^   ^^^      ^^^^^^^^^^^^^^^^^^^^^^         ^^^^ ^^^^^^^^^^ ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^     ^^      ^^           ^^^      ^^^^^^^^^^^^^^     ^^      ^^           ^^      ^^^^^     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^             ^^^^^^^^^^         ^^^      ^^^^^^^^^^^^^^^^^^^^^^^^^^^             ^^^^^^^^^^         ^^^      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^         ^^^     ^^^^^^^^^^     ^^      ^^     ^^^^^^^^^^^^^^^^^^^^^^^^^^^       ^^^   ^^^^^^^^^^^^^^^^^         ^^^     ^^^^^^^^^^     ^^      ^^     ^^^^^^^^^^^^^^^^^^^^^^^^       ^^^   ^^^^^^^^^^^^^^^^^^^^^^         ^^^     ^^^^^^^^^^     ^^      ^^     ^^^^^^^^^^^^^^^^^^^^^^^^       ^^^   ^^^^^^^^^^^^^^^^^^^^^^^^          ^^^     ^^^^^^^^^^     ^^      ^^     ^^^^^^^^^^^^^^^^^^^^^       ^^^   ^^^^^^^^^^^^^^^^^^^^          ^^^     ^^^^^^^^^^     ^^      ^^     ^^^^^^^^^^^^^^^^^^       ^^^   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^         ^^^     ^^^^^^^^^^     ^^      ^^     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^       ^^^   ^^^^^^^^^^^         ^^^     ^^^^^^^^^^     ^^      ^^     ^^^^^^^^^^^^^^^^^^^^^^^^       ^^^   ^^^^^^^^^^^^^^^^^^^^^^^^^^^          ^^^             ^^^^^^^^^^            ^^^^^^^^^^            ^^      ^^     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^          ^^^             ^^^^^^^^^^            ^^^^^^^^^^            ^^      ^^     ^^^^^^^^^^^^^^^^^^^^^^^            ^^^^^^^^^^^^^^^^^^^^^^^^^          ^^^             ^^^^^^^            ^^^^^^^^^^            ^^      ^^     ^^^^^^^^^^^^^^^^^^^^            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^          ^^^             ^^^^^^^^^^            ^^^^^^^^^^            ^^      ^^     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^          ^^^             ^^^^^^^^^^            ^^^^^^^^^^            ^^      ^^     ^^^^^^^^^^^^^^^^^^^^^^^            ^^^^^^^^^^^^^^^^^^^^^^^^^          ^^^             ^^^^^^^            ^^^^^^^^^^            ^^      ^^     ^^^^^^^^^^^^^^^^^^^^            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^         ^^^     ^^^^^^^^^^     ^^      ^^   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^       ^^^   ^^^^^^^^^         ^^^     ^^^^^^^^^^     ^^      ^^   ^^^^^^^^^^^^^^^^^^^^^^^^       ^^^   ^^^^^^^^^^^^^^^^^^^^^^^^^^         ^^^     ^^^^^^^^^^     ^^      ^^   ^^^^^^^^^^^^^^^^^^^^^^^^       ^^^   ^^^^^^^^^^^^^^^^^^^^     ^^^^^^^^^^     ^^^      ^^   ^^^      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^      ^^      ^^     ^^      ^^   ^^^      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^             ^^^^^^^^^^         ^^^      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^        ^^^    ^^^^^^^^     ^^^^^^^^^^     ^^      ^^     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^    ^^^^^     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 >null as any : any
 
diff --git a/tests/baselines/reference/modularizeLibrary_NoErrorDuplicateLibOptions1.types b/tests/baselines/reference/modularizeLibrary_NoErrorDuplicateLibOptions1.types
index 8d93300c580b0..d24e8bfa2f7dc 100644
--- a/tests/baselines/reference/modularizeLibrary_NoErrorDuplicateLibOptions1.types
+++ b/tests/baselines/reference/modularizeLibrary_NoErrorDuplicateLibOptions1.types
@@ -58,14 +58,14 @@ m.clear();
 
 // Using ES6 iterable
 m.keys();
->m.keys() : IterableIterator<string>
->         : ^^^^^^^^^^^^^^^^^^^^^^^^
->m.keys : () => IterableIterator<string>
->       : ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+>m.keys() : BuiltinIterator<string, void, undefined>
+>         : ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+>m.keys : () => BuiltinIterator<string, void, undefined>
+>       : ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 >m : Map<string, number>
 >  : ^^^^^^^^^^^^^^^^^^^
->keys : () => IterableIterator<string>
->     : ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+>keys : () => BuiltinIterator<string, void, undefined>
+>     : ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
 // Using ES6 function
 function Baz() { }
diff --git a/tests/baselines/reference/modularizeLibrary_NoErrorDuplicateLibOptions2.types b/tests/baselines/reference/modularizeLibrary_NoErrorDuplicateLibOptions2.types
index cef80e092b021..f1341c5d6d887 100644
--- a/tests/baselines/reference/modularizeLibrary_NoErrorDuplicateLibOptions2.types
+++ b/tests/baselines/reference/modularizeLibrary_NoErrorDuplicateLibOptions2.types
@@ -58,14 +58,14 @@ m.clear();
 
 // Using ES6 iterable
 m.keys();
->m.keys() : IterableIterator<string>
->         : ^^^^^^^^^^^^^^^^^^^^^^^^
->m.keys : () => IterableIterator<string>
->       : ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+>m.keys() : BuiltinIterator<string, void, undefined>
+>         : ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+>m.keys : () => BuiltinIterator<string, void, undefined>
+>       : ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 >m : Map<string, number>
 >  : ^^^^^^^^^^^^^^^^^^^
->keys : () => IterableIterator<string>
->     : ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+>keys : () => BuiltinIterator<string, void, undefined>
+>     : ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
 // Using ES6 function
 function Baz() { }
diff --git a/tests/baselines/reference/modularizeLibrary_TargetES5UsingES6Lib.types b/tests/baselines/reference/modularizeLibrary_TargetES5UsingES6Lib.types
index e1dc72a902eae..e7cfbaa0d5e04 100644
--- a/tests/baselines/reference/modularizeLibrary_TargetES5UsingES6Lib.types
+++ b/tests/baselines/reference/modularizeLibrary_TargetES5UsingES6Lib.types
@@ -58,14 +58,14 @@ m.clear();
 
 // Using ES6 iterable
 m.keys();
->m.keys() : IterableIterator<string>
->         : ^^^^^^^^^^^^^^^^^^^^^^^^
->m.keys : () => IterableIterator<string>
->       : ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+>m.keys() : BuiltinIterator<string, void, undefined>
+>         : ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+>m.keys : () => BuiltinIterator<string, void, undefined>
+>       : ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 >m : Map<string, number>
 >  : ^^^^^^^^^^^^^^^^^^^
->keys : () => IterableIterator<string>
->     : ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+>keys : () => BuiltinIterator<string, void, undefined>
+>     : ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
 // Using ES6 function
 function Baz() { }
diff --git a/tests/baselines/reference/modularizeLibrary_TargetES6UsingES6Lib.types b/tests/baselines/reference/modularizeLibrary_TargetES6UsingES6Lib.types
index 8edc763ae5cf4..700d4387d40a0 100644
--- a/tests/baselines/reference/modularizeLibrary_TargetES6UsingES6Lib.types
+++ b/tests/baselines/reference/modularizeLibrary_TargetES6UsingES6Lib.types
@@ -58,14 +58,14 @@ m.clear();
 
 // Using ES6 iterable
 m.keys();
->m.keys() : IterableIterator<string>
->         : ^^^^^^^^^^^^^^^^^^^^^^^^
->m.keys : () => IterableIterator<string>
->       : ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+>m.keys() : BuiltinIterator<string, void, undefined>
+>         : ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+>m.keys : () => BuiltinIterator<string, void, undefined>
+>       : ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 >m : Map<string, number>
 >  : ^^^^^^^^^^^^^^^^^^^
->keys : () => IterableIterator<string>
->     : ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+>keys : () => BuiltinIterator<string, void, undefined>
+>     : ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
 // Using ES6 function
 function Baz() { }
diff --git a/tests/baselines/reference/parser.asyncGenerators.classMethods.es2018.types b/tests/baselines/reference/parser.asyncGenerators.classMethods.es2018.types
index e571f92063e79..07f73967a929d 100644
--- a/tests/baselines/reference/parser.asyncGenerators.classMethods.es2018.types
+++ b/tests/baselines/reference/parser.asyncGenerators.classMethods.es2018.types
@@ -225,8 +225,8 @@ class C16 {
 >  : ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
         yield * [];
->yield * [] : any
->           : ^^^
+>yield * [] : void
+>           : ^^^^
 >[] : undefined[]
 >   : ^^^^^^^^^^^
     }
diff --git a/tests/baselines/reference/parser.asyncGenerators.functionDeclarations.es2018.types b/tests/baselines/reference/parser.asyncGenerators.functionDeclarations.es2018.types
index 76d06250437ca..7f9759c787369 100644
--- a/tests/baselines/reference/parser.asyncGenerators.functionDeclarations.es2018.types
+++ b/tests/baselines/reference/parser.asyncGenerators.functionDeclarations.es2018.types
@@ -146,8 +146,8 @@ async function * f16() {
 >    : ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
     yield * [];
->yield * [] : any
->           : ^^^
+>yield * [] : void
+>           : ^^^^
 >[] : undefined[]
 >   : ^^^^^^^^^^^
 }
diff --git a/tests/baselines/reference/parser.asyncGenerators.functionExpressions.es2018.types b/tests/baselines/reference/parser.asyncGenerators.functionExpressions.es2018.types
index e63a49cffa78e..c607554a26dae 100644
--- a/tests/baselines/reference/parser.asyncGenerators.functionExpressions.es2018.types
+++ b/tests/baselines/reference/parser.asyncGenerators.functionExpressions.es2018.types
@@ -194,8 +194,8 @@ const f16 = async function * () {
 >                                      :                                           
 
     yield * [];
->yield * [] : any
->           : ^^^
+>yield * [] : void
+>           : ^^^^
 >[] : undefined[]
 >   : ^^^^^^^^^^^
 
diff --git a/tests/baselines/reference/parser.asyncGenerators.objectLiteralMethods.es2018.types b/tests/baselines/reference/parser.asyncGenerators.objectLiteralMethods.es2018.types
index 44730fb0a18a8..088cf0004d9d9 100644
--- a/tests/baselines/reference/parser.asyncGenerators.objectLiteralMethods.es2018.types
+++ b/tests/baselines/reference/parser.asyncGenerators.objectLiteralMethods.es2018.types
@@ -257,8 +257,8 @@ const o16 = {
 >  : ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
         yield * [];
->yield * [] : any
->           : ^^^
+>yield * [] : void
+>           : ^^^^
 >[] : undefined[]
 >   : ^^^^^^^^^^^
     }
diff --git a/tests/baselines/reference/regexMatchAll-esnext.types b/tests/baselines/reference/regexMatchAll-esnext.types
index 13c2b3b1572af..b98511f1aab80 100644
--- a/tests/baselines/reference/regexMatchAll-esnext.types
+++ b/tests/baselines/reference/regexMatchAll-esnext.types
@@ -2,12 +2,12 @@
 
 === regexMatchAll-esnext.ts ===
 const matches = /\w/g[Symbol.matchAll]("matchAll");
->matches : IterableIterator<RegExpMatchArray>
->        : ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
->/\w/g[Symbol.matchAll]("matchAll") : IterableIterator<RegExpMatchArray>
->                                   : ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
->/\w/g[Symbol.matchAll] : (str: string) => IterableIterator<RegExpMatchArray>
->                       : ^   ^^      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+>matches : BuiltinIterator<RegExpMatchArray, void, undefined>
+>        : ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+>/\w/g[Symbol.matchAll]("matchAll") : BuiltinIterator<RegExpMatchArray, void, undefined>
+>                                   : ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+>/\w/g[Symbol.matchAll] : (str: string) => BuiltinIterator<RegExpMatchArray, void, undefined>
+>                       : ^   ^^      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 >/\w/g : RegExp
 >      : ^^^^^^
 >Symbol.matchAll : unique symbol
@@ -26,8 +26,8 @@ const array = [...matches];
 >             : ^^^^^^^^^^^^^^^^^^
 >...matches : RegExpMatchArray
 >           : ^^^^^^^^^^^^^^^^
->matches : IterableIterator<RegExpMatchArray>
->        : ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+>matches : BuiltinIterator<RegExpMatchArray, void, undefined>
+>        : ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
 const { index, input } = array[0];
 >index : number
diff --git a/tests/baselines/reference/regexMatchAll.types b/tests/baselines/reference/regexMatchAll.types
index 59bd4d730a162..4396a1ef39c49 100644
--- a/tests/baselines/reference/regexMatchAll.types
+++ b/tests/baselines/reference/regexMatchAll.types
@@ -2,12 +2,12 @@
 
 === regexMatchAll.ts ===
 const matches = /\w/g[Symbol.matchAll]("matchAll");
->matches : IterableIterator<RegExpMatchArray>
->        : ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
->/\w/g[Symbol.matchAll]("matchAll") : IterableIterator<RegExpMatchArray>
->                                   : ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
->/\w/g[Symbol.matchAll] : (str: string) => IterableIterator<RegExpMatchArray>
->                       : ^   ^^      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+>matches : BuiltinIterator<RegExpMatchArray, void, undefined>
+>        : ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+>/\w/g[Symbol.matchAll]("matchAll") : BuiltinIterator<RegExpMatchArray, void, undefined>
+>                                   : ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+>/\w/g[Symbol.matchAll] : (str: string) => BuiltinIterator<RegExpMatchArray, void, undefined>
+>                       : ^   ^^      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 >/\w/g : RegExp
 >      : ^^^^^^
 >Symbol.matchAll : unique symbol
@@ -26,8 +26,8 @@ const array = [...matches];
 >             : ^^^^^^^^^^^^^^^^^^
 >...matches : RegExpMatchArray
 >           : ^^^^^^^^^^^^^^^^
->matches : IterableIterator<RegExpMatchArray>
->        : ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+>matches : BuiltinIterator<RegExpMatchArray, void, undefined>
+>        : ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
 const { index, input } = array[0];
 >index : number
diff --git a/tests/baselines/reference/stringMatchAll.types b/tests/baselines/reference/stringMatchAll.types
index 422c849e95422..3755691147afb 100644
--- a/tests/baselines/reference/stringMatchAll.types
+++ b/tests/baselines/reference/stringMatchAll.types
@@ -2,16 +2,16 @@
 
 === stringMatchAll.ts ===
 const matches = "matchAll".matchAll(/\w/g);
->matches : IterableIterator<RegExpExecArray>
->        : ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
->"matchAll".matchAll(/\w/g) : IterableIterator<RegExpExecArray>
->                           : ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
->"matchAll".matchAll : (regexp: RegExp) => IterableIterator<RegExpExecArray>
->                    : ^      ^^      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+>matches : BuiltinIterator<RegExpExecArray, void, undefined>
+>        : ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+>"matchAll".matchAll(/\w/g) : BuiltinIterator<RegExpExecArray, void, undefined>
+>                           : ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+>"matchAll".matchAll : (regexp: RegExp) => BuiltinIterator<RegExpExecArray, void, undefined>
+>                    : ^      ^^      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 >"matchAll" : "matchAll"
 >           : ^^^^^^^^^^
->matchAll : (regexp: RegExp) => IterableIterator<RegExpExecArray>
->         : ^      ^^      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+>matchAll : (regexp: RegExp) => BuiltinIterator<RegExpExecArray, void, undefined>
+>         : ^      ^^      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 >/\w/g : RegExp
 >      : ^^^^^^
 
@@ -22,8 +22,8 @@ const array = [...matches];
 >             : ^^^^^^^^^^^^^^^^^
 >...matches : RegExpExecArray
 >           : ^^^^^^^^^^^^^^^
->matches : IterableIterator<RegExpExecArray>
->        : ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+>matches : BuiltinIterator<RegExpExecArray, void, undefined>
+>        : ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
 const { index, input } = array[0];
 >index : number
diff --git a/tests/baselines/reference/types.asyncGenerators.es2018.1.types b/tests/baselines/reference/types.asyncGenerators.es2018.1.types
index 71633dd0e9edb..35cba542334c7 100644
--- a/tests/baselines/reference/types.asyncGenerators.es2018.1.types
+++ b/tests/baselines/reference/types.asyncGenerators.es2018.1.types
@@ -65,7 +65,8 @@ async function * inferReturnType6() {
 >                 : ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
     yield* [1, 2];
->yield* [1, 2] : any
+>yield* [1, 2] : void
+>              : ^^^^
 >[1, 2] : number[]
 >       : ^^^^^^^^
 >1 : 1
@@ -78,7 +79,8 @@ async function * inferReturnType7() {
 >                 : ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
     yield* [Promise.resolve(1)];
->yield* [Promise.resolve(1)] : any
+>yield* [Promise.resolve(1)] : void
+>                            : ^^^^
 >[Promise.resolve(1)] : Promise<number>[]
 >                     : ^^^^^^^^^^^^^^^^^
 >Promise.resolve(1) : Promise<number>
@@ -150,7 +152,8 @@ const assignability3: () => AsyncIterableIterator<number> = async function * ()
 >                                         : ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
     yield* [1, 2];
->yield* [1, 2] : any
+>yield* [1, 2] : void
+>              : ^^^^
 >[1, 2] : number[]
 >       : ^^^^^^^^
 >1 : 1
@@ -166,7 +169,8 @@ const assignability4: () => AsyncIterableIterator<number> = async function * ()
 >                                                       : ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
     yield* [Promise.resolve(1)];
->yield* [Promise.resolve(1)] : any
+>yield* [Promise.resolve(1)] : void
+>                            : ^^^^
 >[Promise.resolve(1)] : Promise<number>[]
 >                     : ^^^^^^^^^^^^^^^^^
 >Promise.resolve(1) : Promise<number>
@@ -243,7 +247,8 @@ const assignability8: () => AsyncIterable<number> = async function * () {
 >                                         : ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
     yield* [1, 2];
->yield* [1, 2] : any
+>yield* [1, 2] : void
+>              : ^^^^
 >[1, 2] : number[]
 >       : ^^^^^^^^
 >1 : 1
@@ -259,7 +264,8 @@ const assignability9: () => AsyncIterable<number> = async function * () {
 >                                                       : ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
     yield* [Promise.resolve(1)];
->yield* [Promise.resolve(1)] : any
+>yield* [Promise.resolve(1)] : void
+>                            : ^^^^
 >[Promise.resolve(1)] : Promise<number>[]
 >                     : ^^^^^^^^^^^^^^^^^
 >Promise.resolve(1) : Promise<number>
@@ -336,7 +342,8 @@ const assignability13: () => AsyncIterator<number> = async function * () {
 >                                         : ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
     yield* [1, 2];
->yield* [1, 2] : any
+>yield* [1, 2] : void
+>              : ^^^^
 >[1, 2] : number[]
 >       : ^^^^^^^^
 >1 : 1
@@ -352,7 +359,8 @@ const assignability14: () => AsyncIterator<number> = async function * () {
 >                                                       : ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
     yield* [Promise.resolve(1)];
->yield* [Promise.resolve(1)] : any
+>yield* [Promise.resolve(1)] : void
+>                            : ^^^^
 >[Promise.resolve(1)] : Promise<number>[]
 >                     : ^^^^^^^^^^^^^^^^^
 >Promise.resolve(1) : Promise<number>
@@ -421,7 +429,8 @@ async function * explicitReturnType3(): AsyncIterableIterator<number> {
 >                    : ^^^^^^                             
 
     yield* [1, 2];
->yield* [1, 2] : any
+>yield* [1, 2] : void
+>              : ^^^^
 >[1, 2] : number[]
 >       : ^^^^^^^^
 >1 : 1
@@ -434,7 +443,8 @@ async function * explicitReturnType4(): AsyncIterableIterator<number> {
 >                    : ^^^^^^                             
 
     yield* [Promise.resolve(1)];
->yield* [Promise.resolve(1)] : any
+>yield* [Promise.resolve(1)] : void
+>                            : ^^^^
 >[Promise.resolve(1)] : Promise<number>[]
 >                     : ^^^^^^^^^^^^^^^^^
 >Promise.resolve(1) : Promise<number>
@@ -499,7 +509,8 @@ async function * explicitReturnType8(): AsyncIterable<number> {
 >                    : ^^^^^^                     
 
     yield* [1, 2];
->yield* [1, 2] : any
+>yield* [1, 2] : void
+>              : ^^^^
 >[1, 2] : number[]
 >       : ^^^^^^^^
 >1 : 1
@@ -512,7 +523,8 @@ async function * explicitReturnType9(): AsyncIterable<number> {
 >                    : ^^^^^^                     
 
     yield* [Promise.resolve(1)];
->yield* [Promise.resolve(1)] : any
+>yield* [Promise.resolve(1)] : void
+>                            : ^^^^
 >[Promise.resolve(1)] : Promise<number>[]
 >                     : ^^^^^^^^^^^^^^^^^
 >Promise.resolve(1) : Promise<number>
@@ -577,7 +589,8 @@ async function * explicitReturnType13(): AsyncIterator<number> {
 >                     : ^^^^^^                     
 
     yield* [1, 2];
->yield* [1, 2] : any
+>yield* [1, 2] : void
+>              : ^^^^
 >[1, 2] : number[]
 >       : ^^^^^^^^
 >1 : 1
@@ -590,7 +603,8 @@ async function * explicitReturnType14(): AsyncIterator<number> {
 >                     : ^^^^^^                     
 
     yield* [Promise.resolve(1)];
->yield* [Promise.resolve(1)] : any
+>yield* [Promise.resolve(1)] : void
+>                            : ^^^^
 >[Promise.resolve(1)] : Promise<number>[]
 >                     : ^^^^^^^^^^^^^^^^^
 >Promise.resolve(1) : Promise<number>
diff --git a/tests/baselines/reference/types.asyncGenerators.es2018.2.types b/tests/baselines/reference/types.asyncGenerators.es2018.2.types
index 162399d210003..d7a438fd0f6f5 100644
--- a/tests/baselines/reference/types.asyncGenerators.es2018.2.types
+++ b/tests/baselines/reference/types.asyncGenerators.es2018.2.types
@@ -65,8 +65,8 @@ const assignability2: () => AsyncIterableIterator<number> = async function * ()
 >                                             : ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
     yield* ["a", "b"];
->yield* ["a", "b"] : any
->                  : ^^^
+>yield* ["a", "b"] : void
+>                  : ^^^^
 >["a", "b"] : string[]
 >           : ^^^^^^^^
 >"a" : "a"
@@ -116,8 +116,8 @@ const assignability5: () => AsyncIterable<number> = async function * () {
 >                                             : ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
     yield* ["a", "b"];
->yield* ["a", "b"] : any
->                  : ^^^
+>yield* ["a", "b"] : void
+>                  : ^^^^
 >["a", "b"] : string[]
 >           : ^^^^^^^^
 >"a" : "a"
@@ -167,8 +167,8 @@ const assignability8: () => AsyncIterator<number> = async function * () {
 >                                             : ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
     yield* ["a", "b"];
->yield* ["a", "b"] : any
->                  : ^^^
+>yield* ["a", "b"] : void
+>                  : ^^^^
 >["a", "b"] : string[]
 >           : ^^^^^^^^
 >"a" : "a"
@@ -213,8 +213,8 @@ async function * explicitReturnType2(): AsyncIterableIterator<number> {
 >                    : ^^^^^^                             
 
     yield* ["a", "b"];
->yield* ["a", "b"] : any
->                  : ^^^
+>yield* ["a", "b"] : void
+>                  : ^^^^
 >["a", "b"] : string[]
 >           : ^^^^^^^^
 >"a" : "a"
@@ -255,8 +255,8 @@ async function * explicitReturnType5(): AsyncIterable<number> {
 >                    : ^^^^^^                     
 
     yield* ["a", "b"];
->yield* ["a", "b"] : any
->                  : ^^^
+>yield* ["a", "b"] : void
+>                  : ^^^^
 >["a", "b"] : string[]
 >           : ^^^^^^^^
 >"a" : "a"
@@ -297,8 +297,8 @@ async function * explicitReturnType8(): AsyncIterator<number> {
 >                    : ^^^^^^                     
 
     yield* ["a", "b"];
->yield* ["a", "b"] : any
->                  : ^^^
+>yield* ["a", "b"] : void
+>                  : ^^^^
 >["a", "b"] : string[]
 >           : ^^^^^^^^
 >"a" : "a"
diff --git a/tests/baselines/reference/yieldExpressionInControlFlow.errors.txt b/tests/baselines/reference/yieldExpressionInControlFlow.errors.txt
index b751868c96b08..e7d454504e604 100644
--- a/tests/baselines/reference/yieldExpressionInControlFlow.errors.txt
+++ b/tests/baselines/reference/yieldExpressionInControlFlow.errors.txt
@@ -1,4 +1,5 @@
 alsoFails.ts(3,9): error TS7034: Variable 'o' implicitly has type 'any[]' in some locations where its type cannot be determined.
+alsoFails.ts(5,9): error TS2322: Type 'void' is not assignable to type 'any[]'.
 alsoFails.ts(5,20): error TS7005: Variable 'o' implicitly has an 'any[]' type.
 bug25149.js(4,13): error TS7057: 'yield' expression implicitly results in an 'any' type because its containing generator lacks a return-type annotation.
 
@@ -13,7 +14,7 @@ bug25149.js(4,13): error TS7057: 'yield' expression implicitly results in an 'an
         }
     }
     
-==== alsoFails.ts (2 errors) ====
+==== alsoFails.ts (3 errors) ====
     // fails in Typescript too
     function* g() {
         var o = []
@@ -21,6 +22,8 @@ bug25149.js(4,13): error TS7057: 'yield' expression implicitly results in an 'an
 !!! error TS7034: Variable 'o' implicitly has type 'any[]' in some locations where its type cannot be determined.
         while (true) {
             o = yield* o
+            ~
+!!! error TS2322: Type 'void' is not assignable to type 'any[]'.
                        ~
 !!! error TS7005: Variable 'o' implicitly has an 'any[]' type.
         }
diff --git a/tests/baselines/reference/yieldExpressionInControlFlow.types b/tests/baselines/reference/yieldExpressionInControlFlow.types
index a19bd8b6975b2..a7f21148a58a5 100644
--- a/tests/baselines/reference/yieldExpressionInControlFlow.types
+++ b/tests/baselines/reference/yieldExpressionInControlFlow.types
@@ -28,8 +28,8 @@ function* f() {
 === alsoFails.ts ===
 // fails in Typescript too
 function* g() {
->g : () => Generator<any, void, any>
->  : ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+>g : () => Generator<any, void, undefined>
+>  : ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
     var o = []
 >o : any[]
@@ -42,14 +42,14 @@ function* g() {
 >     : ^^^^
 
         o = yield* o
->o = yield* o : any
->             : ^^^
+>o = yield* o : void
+>             : ^^^^
+>o : any[]
+>  : ^^^^^
+>yield* o : void
+>         : ^^^^
 >o : any[]
 >  : ^^^^^
->yield* o : any
->         : ^^^
->o : any
->  : ^^^
     }
 }
 
diff --git a/tests/baselines/reference/yieldExpressionInnerCommentEmit.types b/tests/baselines/reference/yieldExpressionInnerCommentEmit.types
index f6ea97325fd61..ffab26ff43d50 100644
--- a/tests/baselines/reference/yieldExpressionInnerCommentEmit.types
+++ b/tests/baselines/reference/yieldExpressionInnerCommentEmit.types
@@ -21,14 +21,16 @@ function * foo2() {
 >  : ^
 
     yield */*comment4*/ [4];
->yield */*comment4*/ [4] : any
+>yield */*comment4*/ [4] : void
+>                        : ^^^^
 >[4] : number[]
 >    : ^^^^^^^^
 >4 : 4
 >  : ^
 
     yield /*comment5*/* [5];
->yield /*comment5*/* [5] : any
+>yield /*comment5*/* [5] : void
+>                        : ^^^^
 >[5] : number[]
 >    : ^^^^^^^^
 >5 : 5

From c4a8a08e5b96365f63dcca1a576ddc9292cabe7b Mon Sep 17 00:00:00 2001
From: Kevin Gibbons <bakkot@gmail.com>
Date: Wed, 17 Apr 2024 16:55:07 -0700
Subject: [PATCH 8/9] add types for iterator helpers

---
 src/compiler/commandLineParser.ts       |   1 +
 src/lib/esnext.d.ts                     |   1 +
 src/lib/esnext.iterator.d.ts            | 125 ++++++++++++++++++++++++
 src/lib/libs.json                       |   1 +
 tests/cases/compiler/builtinIterator.ts |  69 +++++++++++++
 5 files changed, 197 insertions(+)
 create mode 100644 src/lib/esnext.iterator.d.ts
 create mode 100644 tests/cases/compiler/builtinIterator.ts

diff --git a/src/compiler/commandLineParser.ts b/src/compiler/commandLineParser.ts
index b790ed08fbe08..9d3d21b09b746 100644
--- a/src/compiler/commandLineParser.ts
+++ b/src/compiler/commandLineParser.ts
@@ -236,6 +236,7 @@ const libEntries: [string, string][] = [
     ["esnext.object", "lib.esnext.object.d.ts"],
     ["esnext.array", "lib.esnext.array.d.ts"],
     ["esnext.regexp", "lib.esnext.regexp.d.ts"],
+    ["esnext.iterator", "lib.esnext.iterator.d.ts"],
     ["decorators", "lib.decorators.d.ts"],
     ["decorators.legacy", "lib.decorators.legacy.d.ts"],
 ];
diff --git a/src/lib/esnext.d.ts b/src/lib/esnext.d.ts
index 9e601b60a27c2..7897c58cef67c 100644
--- a/src/lib/esnext.d.ts
+++ b/src/lib/esnext.d.ts
@@ -7,3 +7,4 @@
 /// <reference lib="esnext.collection" />
 /// <reference lib="esnext.array" />
 /// <reference lib="esnext.regexp" />
+/// <reference lib="esnext.iterator" />
diff --git a/src/lib/esnext.iterator.d.ts b/src/lib/esnext.iterator.d.ts
new file mode 100644
index 0000000000000..c41158e4ac40c
--- /dev/null
+++ b/src/lib/esnext.iterator.d.ts
@@ -0,0 +1,125 @@
+/// <reference lib="es2015.iterable" />
+export {};
+
+// Abstract type that allows us to mark `next` as `abstract`
+declare abstract class Iterator<T> {
+    abstract next(value?: undefined): IteratorResult<T, void>;
+}
+
+// Merge all members of `BuiltinIterator<T>` into `Iterator<T>`
+interface Iterator<T> extends globalThis.BuiltinIterator<T, void, undefined> {}
+
+// Capture the `Iterator` constructor in a type we can use in the `extends` clause of `IteratorConstructor`.
+type BuiltinIteratorConstructor = typeof Iterator;
+
+declare global {
+    // Global `BuiltinIterator<T>` interface that can be augmented by polyfills
+    interface BuiltinIterator<T, TReturn, TNext> {
+        /**
+         * Returns this iterator.
+         */
+        [Symbol.iterator](): BuiltinIterator<T, TReturn, TNext>;
+
+        /**
+         * Creates an iterator whose values are the result of applying the callback to the values from this iterator.
+         * @param callbackfn A function that accepts up to two arguments to be used to transform values from the underlying iterator.
+         */
+        map<U>(callbackfn: (value: T, index: number) => U): BuiltinIterator<U>;
+
+        /**
+         * Creates an iterator whose values are those from this iterator for which the provided predicate returns true.
+         * @param predicate A function that accepts up to two arguments to be used to test values from the underlying iterator.
+         */
+        filter<S extends T>(predicate: (value: T, index: number) => value is S): BuiltinIterator<S>;
+
+        /**
+         * Creates an iterator whose values are those from this iterator for which the provided predicate returns true.
+         * @param predicate A function that accepts up to two arguments to be used to test values from the underlying iterator.
+         */
+        filter(predicate: (value: T, index: number) => unknown): BuiltinIterator<T>;
+
+        /**
+         * Creates an iterator whose values are the values from this iterator, stopping once the provided limit is reached.
+         * @param limit The maximum number of values to yield.
+         */
+        take(limit: number): BuiltinIterator<T>;
+
+        /**
+         * Creates an iterator whose values are the values from this iterator after skipping the provided count.
+         * @param count The number of values to drop.
+         */
+        drop(count: number): BuiltinIterator<T>;
+
+        /**
+         * Creates an iterator whose values are the result of applying the callback to the values from this iterator and then flattening the resulting iterators or iterables.
+         * @param callback A function that accepts up to two arguments to be used to transform values from the underlying iterator into new iterators or iterables to be flattened into the result.
+         */
+        flatMap<U>(callback: (value: T, index: number) => Iterator<U> | Iterable<U>): BuiltinIterator<U>;
+
+        /**
+         * Calls the specified callback function for all the elements in this iterator. The return value of the callback function is the accumulated result, and is provided as an argument in the next call to the callback function.
+         * @param callbackfn A function that accepts up to three arguments. The reduce method calls the callbackfn function one time for each element in the iterator.
+         * @param initialValue If initialValue is specified, it is used as the initial value to start the accumulation. The first call to the callbackfn function provides this value as an argument instead of a value from the iterator.
+         */
+        reduce(callbackfn: (previousValue: T, currentValue: T, currentIndex: number) => T): T;
+        reduce(callbackfn: (previousValue: T, currentValue: T, currentIndex: number) => T, initialValue: T): T;
+
+        /**
+         * Calls the specified callback function for all the elements in this iterator. The return value of the callback function is the accumulated result, and is provided as an argument in the next call to the callback function.
+         * @param callbackfn A function that accepts up to three arguments. The reduce method calls the callbackfn function one time for each element in the iterator.
+         * @param initialValue If initialValue is specified, it is used as the initial value to start the accumulation. The first call to the callbackfn function provides this value as an argument instead of a value from the iterator.
+         */
+        reduce<U>(callbackfn: (previousValue: U, currentValue: T, currentIndex: number) => U, initialValue: U): U;
+
+        /**
+         * Creates a new array from the values yielded by this iterator.
+         */
+        toArray(): Array<T>;
+
+        /**
+         * Performs the specified action for each element in the iterator.
+         * @param callbackfn  A function that accepts up to two arguments. forEach calls the callbackfn function one time for each element in the iterator.
+         */
+        forEach(callbackfn: (value: T, index: number) => void): void;
+
+        /**
+         * Determines whether the specified callback function returns true for any element of this iterator.
+         * @param predicate A function that accepts up to two arguments. The some method calls
+         * the predicate function for each element in this iterator until the predicate returns a value
+         * true, or until the end of the iterator.
+         */
+        some(predicate: (value: T, index: number) => unknown): boolean;
+
+        /**
+         * Determines whether all the members of this iterator satisfy the specified test.
+         * @param predicate A function that accepts up to two arguments. The every method calls
+         * the predicate function for each element in this iterator until the predicate returns
+         * false, or until the end of this iterator.
+         */
+        every(predicate: (value: T, index: number) => unknown): boolean;
+
+        /**
+         * Returns the value of the first element in this iterator where predicate is true, and undefined
+         * otherwise.
+         * @param predicate find calls predicate once for each element of this iterator, in
+         * order, until it finds one where predicate returns true. If such an element is found, find
+         * immediately returns that element value. Otherwise, find returns undefined.
+         */
+        find<S extends T>(predicate: (value: T, index: number) => value is S): S | undefined;
+        find(predicate: (value: T, index: number) => unknown): T | undefined;
+
+        readonly [Symbol.toStringTag]: string;
+    }
+
+    // Global `IteratorConstructor` interface that can be augmented by polyfills
+    interface IteratorConstructor extends BuiltinIteratorConstructor {
+        /**
+         * Creates a native iterator from an iterator or iterable object.
+         * Returns its input if the input already inherits from the built-in Iterator class.
+         * @param value An iterator or iterable object to convert a native iterator.
+         */
+        from<T>(value: Iterator<T> | Iterable<T>): BuiltinIterator<T>;
+    }
+
+    var Iterator: IteratorConstructor;
+}
diff --git a/src/lib/libs.json b/src/lib/libs.json
index d97a25e09679f..5103307c2b24b 100644
--- a/src/lib/libs.json
+++ b/src/lib/libs.json
@@ -79,6 +79,7 @@
         "esnext.collection",
         "esnext.array",
         "esnext.regexp",
+        "esnext.iterator",
         "decorators",
         "decorators.legacy",
         // Default libraries
diff --git a/tests/cases/compiler/builtinIterator.ts b/tests/cases/compiler/builtinIterator.ts
new file mode 100644
index 0000000000000..6d3054400a9fc
--- /dev/null
+++ b/tests/cases/compiler/builtinIterator.ts
@@ -0,0 +1,69 @@
+// @target: esnext
+
+const iterator = Iterator.from([0, 1, 2]);
+
+const mapped = iterator.map(String);
+
+const filtered = iterator.filter(x => x > 0);
+
+function isZero(x: number): x is 0 {
+  return x === 0;
+}
+const zero = iterator.filter(isZero);
+
+const iteratorFromBare = Iterator.from({
+  next() {
+    return {
+      done: Math.random() < .5,
+      value: "a string",
+    };
+  },
+});
+
+
+function* gen() {
+  yield 0;
+}
+
+const mappedGen = gen().map(x => x === 0 ? "zero" : "other");
+
+const mappedValues = [0, 1, 2].values().map(x => x === 0 ? "zero" : "other");
+
+
+class GoodIterator extends Iterator<number> {
+  next() {
+    return { done: false, value: 0 } as const;
+  }
+}
+
+// error cases
+new Iterator<number>();
+
+class C extends Iterator<number> {}
+
+// it's unfortunate that these are an error
+class BadIterator1 extends Iterator<number> {
+  next() {
+    if (Math.random() < .5) {
+      return { done: false, value: 0 } as const;
+    } else {
+      return { done: true, value: "a string" } as const;
+    }
+  }
+}
+
+class BadIterator2 extends Iterator<number> {
+  next() {
+    return { done: false, value: 0 };
+  }
+}
+
+class BadIterator3 extends Iterator<number> {
+  next() {
+    if (Math.random() < .5) {
+      return { done: false, value: 0 };
+    } else {
+      return { done: true, value: "a string" };
+    }
+  }
+}

From 51124aee914e7e7429d7aadca0e983581b1a30d5 Mon Sep 17 00:00:00 2001
From: Kevin Gibbons <bakkot@gmail.com>
Date: Wed, 17 Apr 2024 18:37:51 -0700
Subject: [PATCH 9/9] rebaseline

---
 .../reference/builtinIterator.errors.txt      | 120 ++++++
 tests/baselines/reference/builtinIterator.js  | 128 ++++++
 .../reference/builtinIterator.symbols         | 173 ++++++++
 .../baselines/reference/builtinIterator.types | 390 ++++++++++++++++++
 ...odule(moduleresolution=bundler).trace.json |  15 +
 ...dule(moduleresolution=nodenext).trace.json |  15 +
 .../Parse --lib option with extra comma.js    |   2 +-
 ... --lib option with trailing white-space.js |   2 +-
 .../Parse invalid option of library flags.js  |   2 +-
 ...array to compiler-options with json api.js |   2 +-
 ...ompiler-options with jsonSourceFile api.js |   2 +-
 ... libs to compiler-options with json api.js |   2 +-
 ...ompiler-options with jsonSourceFile api.js |   2 +-
 ... libs to compiler-options with json api.js |   2 +-
 ...ompiler-options with jsonSourceFile api.js |   2 +-
 ... libs to compiler-options with json api.js |   2 +-
 ...ompiler-options with jsonSourceFile api.js |   2 +-
 .../dependentDestructuredVariables.symbols    |   2 +-
 .../dependentDestructuredVariables.types      |   2 +-
 .../esNextWeakRefs_IterableWeakMap.types      |   4 +
 .../flatArrayNoExcessiveStackDepth.types      |   2 +-
 .../generatorReturnContextualType.symbols     |   2 +-
 ...generatorReturnExpressionIsChecked.symbols |   2 +-
 ...nTypeIndirectReferenceToGlobalType.symbols |   2 +-
 .../generatorYieldContextualType.types        |   4 +
 .../reference/libCompileChecks.types          |   4 +-
 tests/baselines/reference/mapGroupBy.types    |   4 +
 .../reference/modulePreserve2.trace.json      |  14 +
 .../reference/modulePreserve3.trace.json      |  13 +
 .../narrowingPastLastAssignment.types         |   4 +
 ...sTypesVersions(module=nodenext).trace.json |  14 +
 ...PackageImports(module=nodenext).trace.json |  15 +
 ...xportsTrailers(module=nodenext).trace.json |  14 +
 tests/baselines/reference/objectGroupBy.types |   4 +
 ...enthesizedJSDocCastAtReturnStatement.types |   4 +
 .../reactJsxReactResolvedNodeNext.trace.json  |  13 +
 ...eactJsxReactResolvedNodeNextEsm.trace.json |  13 +
 .../substitutionTypePassedToExtends.types     |   4 +
 ...does-not-add-color-when-NO_COLOR-is-set.js |   2 +-
 ...-when-host-can't-provide-terminal-width.js |   2 +-
 ...tatus.DiagnosticsPresent_OutputsSkipped.js |   2 +-
 .../telemetry/does-not-expose-paths.js        |   2 +-
 .../types.asyncGenerators.es2018.2.symbols    |   2 +-
 .../typesVersions.ambientModules.trace.json   |  14 +
 .../typesVersions.emptyTypes.trace.json       |  15 +
 .../typesVersions.justIndex.trace.json        |  15 +
 .../typesVersions.multiFile.trace.json        |  14 +
 ...VersionsDeclarationEmit.ambient.trace.json |  14 +
 ...rsionsDeclarationEmit.multiFile.trace.json |  14 +
 ...it.multiFileBackReferenceToSelf.trace.json |  14 +
 ...ultiFileBackReferenceToUnmapped.trace.json |  14 +
 .../unionAndIntersectionInference3.symbols    |   4 +-
 52 files changed, 1105 insertions(+), 26 deletions(-)
 create mode 100644 tests/baselines/reference/builtinIterator.errors.txt
 create mode 100644 tests/baselines/reference/builtinIterator.js
 create mode 100644 tests/baselines/reference/builtinIterator.symbols
 create mode 100644 tests/baselines/reference/builtinIterator.types

diff --git a/tests/baselines/reference/builtinIterator.errors.txt b/tests/baselines/reference/builtinIterator.errors.txt
new file mode 100644
index 0000000000000..a4c3fcc09debb
--- /dev/null
+++ b/tests/baselines/reference/builtinIterator.errors.txt
@@ -0,0 +1,120 @@
+builtinIterator.ts(38,1): error TS2511: Cannot create an instance of an abstract class.
+builtinIterator.ts(40,7): error TS2515: Non-abstract class 'C' does not implement inherited abstract member next from class 'Iterator<number>'.
+builtinIterator.ts(44,3): error TS2416: Property 'next' in type 'BadIterator1' is not assignable to the same property in base type 'Iterator<number>'.
+  Type '() => { readonly done: false; readonly value: 0; } | { readonly done: true; readonly value: "a string"; }' is not assignable to type '(value?: undefined) => IteratorResult<number, void>'.
+    Type '{ readonly done: false; readonly value: 0; } | { readonly done: true; readonly value: "a string"; }' is not assignable to type 'IteratorResult<number, void>'.
+      Type '{ readonly done: true; readonly value: "a string"; }' is not assignable to type 'IteratorResult<number, void>'.
+        Type '{ readonly done: true; readonly value: "a string"; }' is not assignable to type 'IteratorReturnResult<void>'.
+          Types of property 'value' are incompatible.
+            Type 'string' is not assignable to type 'void'.
+builtinIterator.ts(54,3): error TS2416: Property 'next' in type 'BadIterator2' is not assignable to the same property in base type 'Iterator<number>'.
+  Type '() => { done: boolean; value: number; }' is not assignable to type '(value?: undefined) => IteratorResult<number, void>'.
+    Type '{ done: boolean; value: number; }' is not assignable to type 'IteratorResult<number, void>'.
+      Type '{ done: boolean; value: number; }' is not assignable to type 'IteratorReturnResult<void>'.
+        Types of property 'done' are incompatible.
+          Type 'boolean' is not assignable to type 'true'.
+builtinIterator.ts(60,3): error TS2416: Property 'next' in type 'BadIterator3' is not assignable to the same property in base type 'Iterator<number>'.
+  Type '() => { done: boolean; value: number; } | { done: boolean; value: string; }' is not assignable to type '(value?: undefined) => IteratorResult<number, void>'.
+    Type '{ done: boolean; value: number; } | { done: boolean; value: string; }' is not assignable to type 'IteratorResult<number, void>'.
+      Type '{ done: boolean; value: number; }' is not assignable to type 'IteratorResult<number, void>'.
+        Type '{ done: boolean; value: number; }' is not assignable to type 'IteratorReturnResult<void>'.
+          Types of property 'done' are incompatible.
+            Type 'boolean' is not assignable to type 'true'.
+
+
+==== builtinIterator.ts (5 errors) ====
+    const iterator = Iterator.from([0, 1, 2]);
+    
+    const mapped = iterator.map(String);
+    
+    const filtered = iterator.filter(x => x > 0);
+    
+    function isZero(x: number): x is 0 {
+      return x === 0;
+    }
+    const zero = iterator.filter(isZero);
+    
+    const iteratorFromBare = Iterator.from({
+      next() {
+        return {
+          done: Math.random() < .5,
+          value: "a string",
+        };
+      },
+    });
+    
+    
+    function* gen() {
+      yield 0;
+    }
+    
+    const mappedGen = gen().map(x => x === 0 ? "zero" : "other");
+    
+    const mappedValues = [0, 1, 2].values().map(x => x === 0 ? "zero" : "other");
+    
+    
+    class GoodIterator extends Iterator<number> {
+      next() {
+        return { done: false, value: 0 } as const;
+      }
+    }
+    
+    // error cases
+    new Iterator<number>();
+    ~~~~~~~~~~~~~~~~~~~~~~
+!!! error TS2511: Cannot create an instance of an abstract class.
+    
+    class C extends Iterator<number> {}
+          ~
+!!! error TS2515: Non-abstract class 'C' does not implement inherited abstract member next from class 'Iterator<number>'.
+    
+    // it's unfortunate that these are an error
+    class BadIterator1 extends Iterator<number> {
+      next() {
+      ~~~~
+!!! error TS2416: Property 'next' in type 'BadIterator1' is not assignable to the same property in base type 'Iterator<number>'.
+!!! error TS2416:   Type '() => { readonly done: false; readonly value: 0; } | { readonly done: true; readonly value: "a string"; }' is not assignable to type '(value?: undefined) => IteratorResult<number, void>'.
+!!! error TS2416:     Type '{ readonly done: false; readonly value: 0; } | { readonly done: true; readonly value: "a string"; }' is not assignable to type 'IteratorResult<number, void>'.
+!!! error TS2416:       Type '{ readonly done: true; readonly value: "a string"; }' is not assignable to type 'IteratorResult<number, void>'.
+!!! error TS2416:         Type '{ readonly done: true; readonly value: "a string"; }' is not assignable to type 'IteratorReturnResult<void>'.
+!!! error TS2416:           Types of property 'value' are incompatible.
+!!! error TS2416:             Type 'string' is not assignable to type 'void'.
+        if (Math.random() < .5) {
+          return { done: false, value: 0 } as const;
+        } else {
+          return { done: true, value: "a string" } as const;
+        }
+      }
+    }
+    
+    class BadIterator2 extends Iterator<number> {
+      next() {
+      ~~~~
+!!! error TS2416: Property 'next' in type 'BadIterator2' is not assignable to the same property in base type 'Iterator<number>'.
+!!! error TS2416:   Type '() => { done: boolean; value: number; }' is not assignable to type '(value?: undefined) => IteratorResult<number, void>'.
+!!! error TS2416:     Type '{ done: boolean; value: number; }' is not assignable to type 'IteratorResult<number, void>'.
+!!! error TS2416:       Type '{ done: boolean; value: number; }' is not assignable to type 'IteratorReturnResult<void>'.
+!!! error TS2416:         Types of property 'done' are incompatible.
+!!! error TS2416:           Type 'boolean' is not assignable to type 'true'.
+        return { done: false, value: 0 };
+      }
+    }
+    
+    class BadIterator3 extends Iterator<number> {
+      next() {
+      ~~~~
+!!! error TS2416: Property 'next' in type 'BadIterator3' is not assignable to the same property in base type 'Iterator<number>'.
+!!! error TS2416:   Type '() => { done: boolean; value: number; } | { done: boolean; value: string; }' is not assignable to type '(value?: undefined) => IteratorResult<number, void>'.
+!!! error TS2416:     Type '{ done: boolean; value: number; } | { done: boolean; value: string; }' is not assignable to type 'IteratorResult<number, void>'.
+!!! error TS2416:       Type '{ done: boolean; value: number; }' is not assignable to type 'IteratorResult<number, void>'.
+!!! error TS2416:         Type '{ done: boolean; value: number; }' is not assignable to type 'IteratorReturnResult<void>'.
+!!! error TS2416:           Types of property 'done' are incompatible.
+!!! error TS2416:             Type 'boolean' is not assignable to type 'true'.
+        if (Math.random() < .5) {
+          return { done: false, value: 0 };
+        } else {
+          return { done: true, value: "a string" };
+        }
+      }
+    }
+    
\ No newline at end of file
diff --git a/tests/baselines/reference/builtinIterator.js b/tests/baselines/reference/builtinIterator.js
new file mode 100644
index 0000000000000..f122380cd5cb2
--- /dev/null
+++ b/tests/baselines/reference/builtinIterator.js
@@ -0,0 +1,128 @@
+//// [tests/cases/compiler/builtinIterator.ts] ////
+
+//// [builtinIterator.ts]
+const iterator = Iterator.from([0, 1, 2]);
+
+const mapped = iterator.map(String);
+
+const filtered = iterator.filter(x => x > 0);
+
+function isZero(x: number): x is 0 {
+  return x === 0;
+}
+const zero = iterator.filter(isZero);
+
+const iteratorFromBare = Iterator.from({
+  next() {
+    return {
+      done: Math.random() < .5,
+      value: "a string",
+    };
+  },
+});
+
+
+function* gen() {
+  yield 0;
+}
+
+const mappedGen = gen().map(x => x === 0 ? "zero" : "other");
+
+const mappedValues = [0, 1, 2].values().map(x => x === 0 ? "zero" : "other");
+
+
+class GoodIterator extends Iterator<number> {
+  next() {
+    return { done: false, value: 0 } as const;
+  }
+}
+
+// error cases
+new Iterator<number>();
+
+class C extends Iterator<number> {}
+
+// it's unfortunate that these are an error
+class BadIterator1 extends Iterator<number> {
+  next() {
+    if (Math.random() < .5) {
+      return { done: false, value: 0 } as const;
+    } else {
+      return { done: true, value: "a string" } as const;
+    }
+  }
+}
+
+class BadIterator2 extends Iterator<number> {
+  next() {
+    return { done: false, value: 0 };
+  }
+}
+
+class BadIterator3 extends Iterator<number> {
+  next() {
+    if (Math.random() < .5) {
+      return { done: false, value: 0 };
+    } else {
+      return { done: true, value: "a string" };
+    }
+  }
+}
+
+
+//// [builtinIterator.js]
+const iterator = Iterator.from([0, 1, 2]);
+const mapped = iterator.map(String);
+const filtered = iterator.filter(x => x > 0);
+function isZero(x) {
+    return x === 0;
+}
+const zero = iterator.filter(isZero);
+const iteratorFromBare = Iterator.from({
+    next() {
+        return {
+            done: Math.random() < .5,
+            value: "a string",
+        };
+    },
+});
+function* gen() {
+    yield 0;
+}
+const mappedGen = gen().map(x => x === 0 ? "zero" : "other");
+const mappedValues = [0, 1, 2].values().map(x => x === 0 ? "zero" : "other");
+class GoodIterator extends Iterator {
+    next() {
+        return { done: false, value: 0 };
+    }
+}
+// error cases
+new Iterator();
+class C extends Iterator {
+}
+// it's unfortunate that these are an error
+class BadIterator1 extends Iterator {
+    next() {
+        if (Math.random() < .5) {
+            return { done: false, value: 0 };
+        }
+        else {
+            return { done: true, value: "a string" };
+        }
+    }
+}
+class BadIterator2 extends Iterator {
+    next() {
+        return { done: false, value: 0 };
+    }
+}
+class BadIterator3 extends Iterator {
+    next() {
+        if (Math.random() < .5) {
+            return { done: false, value: 0 };
+        }
+        else {
+            return { done: true, value: "a string" };
+        }
+    }
+}
diff --git a/tests/baselines/reference/builtinIterator.symbols b/tests/baselines/reference/builtinIterator.symbols
new file mode 100644
index 0000000000000..bf49597402407
--- /dev/null
+++ b/tests/baselines/reference/builtinIterator.symbols
@@ -0,0 +1,173 @@
+//// [tests/cases/compiler/builtinIterator.ts] ////
+
+=== builtinIterator.ts ===
+const iterator = Iterator.from([0, 1, 2]);
+>iterator : Symbol(iterator, Decl(builtinIterator.ts, 0, 5))
+>Iterator.from : Symbol(IteratorConstructor.from, Decl(lib.esnext.iterator.d.ts, --, --))
+>Iterator : Symbol(Iterator, Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.esnext.iterator.d.ts, --, --))
+>from : Symbol(IteratorConstructor.from, Decl(lib.esnext.iterator.d.ts, --, --))
+
+const mapped = iterator.map(String);
+>mapped : Symbol(mapped, Decl(builtinIterator.ts, 2, 5))
+>iterator.map : Symbol(BuiltinIterator.map, Decl(lib.esnext.iterator.d.ts, --, --))
+>iterator : Symbol(iterator, Decl(builtinIterator.ts, 0, 5))
+>map : Symbol(BuiltinIterator.map, Decl(lib.esnext.iterator.d.ts, --, --))
+>String : Symbol(String, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --) ... and 6 more)
+
+const filtered = iterator.filter(x => x > 0);
+>filtered : Symbol(filtered, Decl(builtinIterator.ts, 4, 5))
+>iterator.filter : Symbol(BuiltinIterator.filter, Decl(lib.esnext.iterator.d.ts, --, --), Decl(lib.esnext.iterator.d.ts, --, --))
+>iterator : Symbol(iterator, Decl(builtinIterator.ts, 0, 5))
+>filter : Symbol(BuiltinIterator.filter, Decl(lib.esnext.iterator.d.ts, --, --), Decl(lib.esnext.iterator.d.ts, --, --))
+>x : Symbol(x, Decl(builtinIterator.ts, 4, 33))
+>x : Symbol(x, Decl(builtinIterator.ts, 4, 33))
+
+function isZero(x: number): x is 0 {
+>isZero : Symbol(isZero, Decl(builtinIterator.ts, 4, 45))
+>x : Symbol(x, Decl(builtinIterator.ts, 6, 16))
+>x : Symbol(x, Decl(builtinIterator.ts, 6, 16))
+
+  return x === 0;
+>x : Symbol(x, Decl(builtinIterator.ts, 6, 16))
+}
+const zero = iterator.filter(isZero);
+>zero : Symbol(zero, Decl(builtinIterator.ts, 9, 5))
+>iterator.filter : Symbol(BuiltinIterator.filter, Decl(lib.esnext.iterator.d.ts, --, --), Decl(lib.esnext.iterator.d.ts, --, --))
+>iterator : Symbol(iterator, Decl(builtinIterator.ts, 0, 5))
+>filter : Symbol(BuiltinIterator.filter, Decl(lib.esnext.iterator.d.ts, --, --), Decl(lib.esnext.iterator.d.ts, --, --))
+>isZero : Symbol(isZero, Decl(builtinIterator.ts, 4, 45))
+
+const iteratorFromBare = Iterator.from({
+>iteratorFromBare : Symbol(iteratorFromBare, Decl(builtinIterator.ts, 11, 5))
+>Iterator.from : Symbol(IteratorConstructor.from, Decl(lib.esnext.iterator.d.ts, --, --))
+>Iterator : Symbol(Iterator, Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.esnext.iterator.d.ts, --, --))
+>from : Symbol(IteratorConstructor.from, Decl(lib.esnext.iterator.d.ts, --, --))
+
+  next() {
+>next : Symbol(next, Decl(builtinIterator.ts, 11, 40))
+
+    return {
+      done: Math.random() < .5,
+>done : Symbol(done, Decl(builtinIterator.ts, 13, 12))
+>Math.random : Symbol(Math.random, Decl(lib.es5.d.ts, --, --))
+>Math : Symbol(Math, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.symbol.wellknown.d.ts, --, --))
+>random : Symbol(Math.random, Decl(lib.es5.d.ts, --, --))
+
+      value: "a string",
+>value : Symbol(value, Decl(builtinIterator.ts, 14, 31))
+
+    };
+  },
+});
+
+
+function* gen() {
+>gen : Symbol(gen, Decl(builtinIterator.ts, 18, 3))
+
+  yield 0;
+}
+
+const mappedGen = gen().map(x => x === 0 ? "zero" : "other");
+>mappedGen : Symbol(mappedGen, Decl(builtinIterator.ts, 25, 5))
+>gen().map : Symbol(BuiltinIterator.map, Decl(lib.esnext.iterator.d.ts, --, --))
+>gen : Symbol(gen, Decl(builtinIterator.ts, 18, 3))
+>map : Symbol(BuiltinIterator.map, Decl(lib.esnext.iterator.d.ts, --, --))
+>x : Symbol(x, Decl(builtinIterator.ts, 25, 28))
+>x : Symbol(x, Decl(builtinIterator.ts, 25, 28))
+
+const mappedValues = [0, 1, 2].values().map(x => x === 0 ? "zero" : "other");
+>mappedValues : Symbol(mappedValues, Decl(builtinIterator.ts, 27, 5))
+>[0, 1, 2].values().map : Symbol(BuiltinIterator.map, Decl(lib.esnext.iterator.d.ts, --, --))
+>[0, 1, 2].values : Symbol(Array.values, Decl(lib.es2015.iterable.d.ts, --, --))
+>values : Symbol(Array.values, Decl(lib.es2015.iterable.d.ts, --, --))
+>map : Symbol(BuiltinIterator.map, Decl(lib.esnext.iterator.d.ts, --, --))
+>x : Symbol(x, Decl(builtinIterator.ts, 27, 44))
+>x : Symbol(x, Decl(builtinIterator.ts, 27, 44))
+
+
+class GoodIterator extends Iterator<number> {
+>GoodIterator : Symbol(GoodIterator, Decl(builtinIterator.ts, 27, 77))
+>Iterator : Symbol(Iterator, Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.esnext.iterator.d.ts, --, --))
+
+  next() {
+>next : Symbol(GoodIterator.next, Decl(builtinIterator.ts, 30, 45))
+
+    return { done: false, value: 0 } as const;
+>done : Symbol(done, Decl(builtinIterator.ts, 32, 12))
+>value : Symbol(value, Decl(builtinIterator.ts, 32, 25))
+>const : Symbol(const)
+  }
+}
+
+// error cases
+new Iterator<number>();
+>Iterator : Symbol(Iterator, Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.esnext.iterator.d.ts, --, --))
+
+class C extends Iterator<number> {}
+>C : Symbol(C, Decl(builtinIterator.ts, 37, 23))
+>Iterator : Symbol(Iterator, Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.esnext.iterator.d.ts, --, --))
+
+// it's unfortunate that these are an error
+class BadIterator1 extends Iterator<number> {
+>BadIterator1 : Symbol(BadIterator1, Decl(builtinIterator.ts, 39, 35))
+>Iterator : Symbol(Iterator, Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.esnext.iterator.d.ts, --, --))
+
+  next() {
+>next : Symbol(BadIterator1.next, Decl(builtinIterator.ts, 42, 45))
+
+    if (Math.random() < .5) {
+>Math.random : Symbol(Math.random, Decl(lib.es5.d.ts, --, --))
+>Math : Symbol(Math, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.symbol.wellknown.d.ts, --, --))
+>random : Symbol(Math.random, Decl(lib.es5.d.ts, --, --))
+
+      return { done: false, value: 0 } as const;
+>done : Symbol(done, Decl(builtinIterator.ts, 45, 14))
+>value : Symbol(value, Decl(builtinIterator.ts, 45, 27))
+>const : Symbol(const)
+
+    } else {
+      return { done: true, value: "a string" } as const;
+>done : Symbol(done, Decl(builtinIterator.ts, 47, 14))
+>value : Symbol(value, Decl(builtinIterator.ts, 47, 26))
+>const : Symbol(const)
+    }
+  }
+}
+
+class BadIterator2 extends Iterator<number> {
+>BadIterator2 : Symbol(BadIterator2, Decl(builtinIterator.ts, 50, 1))
+>Iterator : Symbol(Iterator, Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.esnext.iterator.d.ts, --, --))
+
+  next() {
+>next : Symbol(BadIterator2.next, Decl(builtinIterator.ts, 52, 45))
+
+    return { done: false, value: 0 };
+>done : Symbol(done, Decl(builtinIterator.ts, 54, 12))
+>value : Symbol(value, Decl(builtinIterator.ts, 54, 25))
+  }
+}
+
+class BadIterator3 extends Iterator<number> {
+>BadIterator3 : Symbol(BadIterator3, Decl(builtinIterator.ts, 56, 1))
+>Iterator : Symbol(Iterator, Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.esnext.iterator.d.ts, --, --))
+
+  next() {
+>next : Symbol(BadIterator3.next, Decl(builtinIterator.ts, 58, 45))
+
+    if (Math.random() < .5) {
+>Math.random : Symbol(Math.random, Decl(lib.es5.d.ts, --, --))
+>Math : Symbol(Math, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.symbol.wellknown.d.ts, --, --))
+>random : Symbol(Math.random, Decl(lib.es5.d.ts, --, --))
+
+      return { done: false, value: 0 };
+>done : Symbol(done, Decl(builtinIterator.ts, 61, 14))
+>value : Symbol(value, Decl(builtinIterator.ts, 61, 27))
+
+    } else {
+      return { done: true, value: "a string" };
+>done : Symbol(done, Decl(builtinIterator.ts, 63, 14))
+>value : Symbol(value, Decl(builtinIterator.ts, 63, 26))
+    }
+  }
+}
+
diff --git a/tests/baselines/reference/builtinIterator.types b/tests/baselines/reference/builtinIterator.types
new file mode 100644
index 0000000000000..48470fcf1238a
--- /dev/null
+++ b/tests/baselines/reference/builtinIterator.types
@@ -0,0 +1,390 @@
+//// [tests/cases/compiler/builtinIterator.ts] ////
+
+=== builtinIterator.ts ===
+const iterator = Iterator.from([0, 1, 2]);
+>iterator : BuiltinIterator<number, void, undefined>
+>         : ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+>Iterator.from([0, 1, 2]) : BuiltinIterator<number, void, undefined>
+>                         : ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+>Iterator.from : <T>(value: Iterator<T> | Iterable<T>) => BuiltinIterator<T, void, undefined>
+>              : ^ ^^     ^^                         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+>Iterator : IteratorConstructor
+>         : ^^^^^^^^^^^^^^^^^^^
+>from : <T>(value: Iterator<T> | Iterable<T>) => BuiltinIterator<T, void, undefined>
+>     : ^ ^^     ^^                         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+>[0, 1, 2] : number[]
+>          : ^^^^^^^^
+>0 : 0
+>  : ^
+>1 : 1
+>  : ^
+>2 : 2
+>  : ^
+
+const mapped = iterator.map(String);
+>mapped : BuiltinIterator<string, void, undefined>
+>       : ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+>iterator.map(String) : BuiltinIterator<string, void, undefined>
+>                     : ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+>iterator.map : <U>(callbackfn: (value: number, index: number) => U) => BuiltinIterator<U, void, undefined>
+>             : ^^^^          ^^^     ^^^^^^^^^^     ^^      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+>iterator : BuiltinIterator<number, void, undefined>
+>         : ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+>map : <U>(callbackfn: (value: number, index: number) => U) => BuiltinIterator<U, void, undefined>
+>    : ^^^^          ^^^     ^^^^^^^^^^     ^^      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+>String : StringConstructor
+>       : ^^^^^^^^^^^^^^^^^
+
+const filtered = iterator.filter(x => x > 0);
+>filtered : BuiltinIterator<number, void, undefined>
+>         : ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+>iterator.filter(x => x > 0) : BuiltinIterator<number, void, undefined>
+>                            : ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+>iterator.filter : { <S extends number>(predicate: (value: number, index: number) => value is S): BuiltinIterator<S, void, undefined>; (predicate: (value: number, index: number) => unknown): BuiltinIterator<number, void, undefined>; }
+>                : ^^^^^^^^^^^^^^^^^^^^^         ^^^     ^^^^^^^^^^     ^^      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^         ^^^     ^^^^^^^^^^     ^^      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+>iterator : BuiltinIterator<number, void, undefined>
+>         : ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+>filter : { <S extends number>(predicate: (value: number, index: number) => value is S): BuiltinIterator<S, void, undefined>; (predicate: (value: number, index: number) => unknown): BuiltinIterator<number, void, undefined>; }
+>       : ^^^^^^^^^^^^^^^^^^^^^         ^^^     ^^^^^^^^^^     ^^      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^         ^^^     ^^^^^^^^^^     ^^      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+>x => x > 0 : (x: number) => boolean
+>           : ^ ^^^^^^^^^^^^^^^^^^^^
+>x : number
+>  : ^^^^^^
+>x > 0 : boolean
+>      : ^^^^^^^
+>x : number
+>  : ^^^^^^
+>0 : 0
+>  : ^
+
+function isZero(x: number): x is 0 {
+>isZero : (x: number) => x is 0
+>       : ^ ^^      ^^^^^      
+>x : number
+>  : ^^^^^^
+
+  return x === 0;
+>x === 0 : boolean
+>        : ^^^^^^^
+>x : number
+>  : ^^^^^^
+>0 : 0
+>  : ^
+}
+const zero = iterator.filter(isZero);
+>zero : BuiltinIterator<0, void, undefined>
+>     : ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+>iterator.filter(isZero) : BuiltinIterator<0, void, undefined>
+>                        : ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+>iterator.filter : { <S extends number>(predicate: (value: number, index: number) => value is S): BuiltinIterator<S, void, undefined>; (predicate: (value: number, index: number) => unknown): BuiltinIterator<number, void, undefined>; }
+>                : ^^^^^^^^^^^^^^^^^^^^^         ^^^     ^^^^^^^^^^     ^^      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^         ^^^     ^^^^^^^^^^     ^^      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+>iterator : BuiltinIterator<number, void, undefined>
+>         : ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+>filter : { <S extends number>(predicate: (value: number, index: number) => value is S): BuiltinIterator<S, void, undefined>; (predicate: (value: number, index: number) => unknown): BuiltinIterator<number, void, undefined>; }
+>       : ^^^^^^^^^^^^^^^^^^^^^         ^^^     ^^^^^^^^^^     ^^      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^         ^^^     ^^^^^^^^^^     ^^      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+>isZero : (x: number) => x is 0
+>       : ^ ^^      ^^^^^^^^^^^
+
+const iteratorFromBare = Iterator.from({
+>iteratorFromBare : BuiltinIterator<string, void, undefined>
+>                 : ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+>Iterator.from({  next() {    return {      done: Math.random() < .5,      value: "a string",    };  },}) : BuiltinIterator<string, void, undefined>
+>                                                                                                         : ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+>Iterator.from : <T>(value: Iterator<T> | Iterable<T>) => BuiltinIterator<T, void, undefined>
+>              : ^ ^^     ^^                         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+>Iterator : IteratorConstructor
+>         : ^^^^^^^^^^^^^^^^^^^
+>from : <T>(value: Iterator<T> | Iterable<T>) => BuiltinIterator<T, void, undefined>
+>     : ^ ^^     ^^                         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+>{  next() {    return {      done: Math.random() < .5,      value: "a string",    };  },} : { next(): { done: boolean; value: string; }; }
+>                                                                                          : ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+  next() {
+>next : () => { done: boolean; value: string; }
+>     : ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+    return {
+>{      done: Math.random() < .5,      value: "a string",    } : { done: boolean; value: string; }
+>                                                              : ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+      done: Math.random() < .5,
+>done : boolean
+>     : ^^^^^^^
+>Math.random() < .5 : boolean
+>                   : ^^^^^^^
+>Math.random() : number
+>              : ^^^^^^
+>Math.random : () => number
+>            : ^^^^^^^^^^^^
+>Math : Math
+>     : ^^^^
+>random : () => number
+>       : ^^^^^^^^^^^^
+>.5 : 0.5
+>   : ^^^
+
+      value: "a string",
+>value : string
+>      : ^^^^^^
+>"a string" : "a string"
+>           : ^^^^^^^^^^
+
+    };
+  },
+});
+
+
+function* gen() {
+>gen : () => Generator<number, void, unknown>
+>    : ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+  yield 0;
+>yield 0 : any
+>        : ^^^
+>0 : 0
+>  : ^
+}
+
+const mappedGen = gen().map(x => x === 0 ? "zero" : "other");
+>mappedGen : BuiltinIterator<"zero" | "other", void, undefined>
+>          : ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+>gen().map(x => x === 0 ? "zero" : "other") : BuiltinIterator<"zero" | "other", void, undefined>
+>                                           : ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+>gen().map : <U>(callbackfn: (value: number, index: number) => U) => BuiltinIterator<U, void, undefined>
+>          : ^^^^          ^^^     ^^^^^^^^^^     ^^      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+>gen() : Generator<number, void, unknown>
+>      : ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+>gen : () => Generator<number, void, unknown>
+>    : ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+>map : <U>(callbackfn: (value: number, index: number) => U) => BuiltinIterator<U, void, undefined>
+>    : ^^^^          ^^^     ^^^^^^^^^^     ^^      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+>x => x === 0 ? "zero" : "other" : (x: number) => "zero" | "other"
+>                                : ^ ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+>x : number
+>  : ^^^^^^
+>x === 0 ? "zero" : "other" : "zero" | "other"
+>                           : ^^^^^^^^^^^^^^^^
+>x === 0 : boolean
+>        : ^^^^^^^
+>x : number
+>  : ^^^^^^
+>0 : 0
+>  : ^
+>"zero" : "zero"
+>       : ^^^^^^
+>"other" : "other"
+>        : ^^^^^^^
+
+const mappedValues = [0, 1, 2].values().map(x => x === 0 ? "zero" : "other");
+>mappedValues : BuiltinIterator<"zero" | "other", void, undefined>
+>             : ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+>[0, 1, 2].values().map(x => x === 0 ? "zero" : "other") : BuiltinIterator<"zero" | "other", void, undefined>
+>                                                        : ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+>[0, 1, 2].values().map : <U>(callbackfn: (value: number, index: number) => U) => BuiltinIterator<U, void, undefined>
+>                       : ^^^^          ^^^     ^^^^^^^^^^     ^^      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+>[0, 1, 2].values() : BuiltinIterator<number, void, undefined>
+>                   : ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+>[0, 1, 2].values : () => BuiltinIterator<number, void, undefined>
+>                 : ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+>[0, 1, 2] : number[]
+>          : ^^^^^^^^
+>0 : 0
+>  : ^
+>1 : 1
+>  : ^
+>2 : 2
+>  : ^
+>values : () => BuiltinIterator<number, void, undefined>
+>       : ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+>map : <U>(callbackfn: (value: number, index: number) => U) => BuiltinIterator<U, void, undefined>
+>    : ^^^^          ^^^     ^^^^^^^^^^     ^^      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+>x => x === 0 ? "zero" : "other" : (x: number) => "zero" | "other"
+>                                : ^ ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+>x : number
+>  : ^^^^^^
+>x === 0 ? "zero" : "other" : "zero" | "other"
+>                           : ^^^^^^^^^^^^^^^^
+>x === 0 : boolean
+>        : ^^^^^^^
+>x : number
+>  : ^^^^^^
+>0 : 0
+>  : ^
+>"zero" : "zero"
+>       : ^^^^^^
+>"other" : "other"
+>        : ^^^^^^^
+
+
+class GoodIterator extends Iterator<number> {
+>GoodIterator : GoodIterator
+>             : ^^^^^^^^^^^^
+>Iterator : Iterator<number>
+>         : ^^^^^^^^^^^^^^^^
+
+  next() {
+>next : () => { readonly done: false; readonly value: 0; }
+>     : ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+    return { done: false, value: 0 } as const;
+>{ done: false, value: 0 } as const : { readonly done: false; readonly value: 0; }
+>                                   : ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+>{ done: false, value: 0 } : { readonly done: false; readonly value: 0; }
+>                          : ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+>done : false
+>     : ^^^^^
+>false : false
+>      : ^^^^^
+>value : 0
+>      : ^
+>0 : 0
+>  : ^
+  }
+}
+
+// error cases
+new Iterator<number>();
+>new Iterator<number>() : any
+>                       : ^^^
+>Iterator : IteratorConstructor
+>         : ^^^^^^^^^^^^^^^^^^^
+
+class C extends Iterator<number> {}
+>C : C
+>  : ^
+>Iterator : Iterator<number>
+>         : ^^^^^^^^^^^^^^^^
+
+// it's unfortunate that these are an error
+class BadIterator1 extends Iterator<number> {
+>BadIterator1 : BadIterator1
+>             : ^^^^^^^^^^^^
+>Iterator : Iterator<number>
+>         : ^^^^^^^^^^^^^^^^
+
+  next() {
+>next : () => { readonly done: false; readonly value: 0; } | { readonly done: true; readonly value: "a string"; }
+>     : ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+    if (Math.random() < .5) {
+>Math.random() < .5 : boolean
+>                   : ^^^^^^^
+>Math.random() : number
+>              : ^^^^^^
+>Math.random : () => number
+>            : ^^^^^^^^^^^^
+>Math : Math
+>     : ^^^^
+>random : () => number
+>       : ^^^^^^^^^^^^
+>.5 : 0.5
+>   : ^^^
+
+      return { done: false, value: 0 } as const;
+>{ done: false, value: 0 } as const : { readonly done: false; readonly value: 0; }
+>                                   : ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+>{ done: false, value: 0 } : { readonly done: false; readonly value: 0; }
+>                          : ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+>done : false
+>     : ^^^^^
+>false : false
+>      : ^^^^^
+>value : 0
+>      : ^
+>0 : 0
+>  : ^
+
+    } else {
+      return { done: true, value: "a string" } as const;
+>{ done: true, value: "a string" } as const : { readonly done: true; readonly value: "a string"; }
+>                                           : ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+>{ done: true, value: "a string" } : { readonly done: true; readonly value: "a string"; }
+>                                  : ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+>done : true
+>     : ^^^^
+>true : true
+>     : ^^^^
+>value : "a string"
+>      : ^^^^^^^^^^
+>"a string" : "a string"
+>           : ^^^^^^^^^^
+    }
+  }
+}
+
+class BadIterator2 extends Iterator<number> {
+>BadIterator2 : BadIterator2
+>             : ^^^^^^^^^^^^
+>Iterator : Iterator<number>
+>         : ^^^^^^^^^^^^^^^^
+
+  next() {
+>next : () => { done: boolean; value: number; }
+>     : ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+    return { done: false, value: 0 };
+>{ done: false, value: 0 } : { done: boolean; value: number; }
+>                          : ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+>done : boolean
+>     : ^^^^^^^
+>false : false
+>      : ^^^^^
+>value : number
+>      : ^^^^^^
+>0 : 0
+>  : ^
+  }
+}
+
+class BadIterator3 extends Iterator<number> {
+>BadIterator3 : BadIterator3
+>             : ^^^^^^^^^^^^
+>Iterator : Iterator<number>
+>         : ^^^^^^^^^^^^^^^^
+
+  next() {
+>next : () => { done: boolean; value: number; } | { done: boolean; value: string; }
+>     : ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+    if (Math.random() < .5) {
+>Math.random() < .5 : boolean
+>                   : ^^^^^^^
+>Math.random() : number
+>              : ^^^^^^
+>Math.random : () => number
+>            : ^^^^^^^^^^^^
+>Math : Math
+>     : ^^^^
+>random : () => number
+>       : ^^^^^^^^^^^^
+>.5 : 0.5
+>   : ^^^
+
+      return { done: false, value: 0 };
+>{ done: false, value: 0 } : { done: boolean; value: number; }
+>                          : ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+>done : boolean
+>     : ^^^^^^^
+>false : false
+>      : ^^^^^
+>value : number
+>      : ^^^^^^
+>0 : 0
+>  : ^
+
+    } else {
+      return { done: true, value: "a string" };
+>{ done: true, value: "a string" } : { done: boolean; value: string; }
+>                                  : ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+>done : boolean
+>     : ^^^^^^^
+>true : true
+>     : ^^^^
+>value : string
+>      : ^^^^^^
+>"a string" : "a string"
+>           : ^^^^^^^^^^
+    }
+  }
+}
+
diff --git a/tests/baselines/reference/bundlerDirectoryModule(moduleresolution=bundler).trace.json b/tests/baselines/reference/bundlerDirectoryModule(moduleresolution=bundler).trace.json
index 6a9e7816773e6..627a7432632c9 100644
--- a/tests/baselines/reference/bundlerDirectoryModule(moduleresolution=bundler).trace.json
+++ b/tests/baselines/reference/bundlerDirectoryModule(moduleresolution=bundler).trace.json
@@ -1074,6 +1074,21 @@
     "======== Module name '@typescript/lib-esnext/regexp' was not resolved. ========",
     "File '/.ts/package.json' does not exist according to earlier cached lookups.",
     "File '/package.json' does not exist according to earlier cached lookups.",
+    "======== Resolving module '@typescript/lib-esnext/iterator' from '/.src/__lib_node_modules_lookup_lib.esnext.iterator.d.ts__.ts'. ========",
+    "Explicitly specified module resolution kind: 'Node10'.",
+    "Loading module '@typescript/lib-esnext/iterator' from 'node_modules' folder, target file types: TypeScript, Declaration.",
+    "Searching all ancestor node_modules directories for preferred extensions: TypeScript, Declaration.",
+    "Directory '/.src/node_modules' does not exist, skipping all lookups in it.",
+    "Scoped package detected, looking in 'typescript__lib-esnext/iterator'",
+    "Directory '/node_modules' does not exist, skipping all lookups in it.",
+    "Scoped package detected, looking in 'typescript__lib-esnext/iterator'",
+    "Loading module '@typescript/lib-esnext/iterator' from 'node_modules' folder, target file types: JavaScript.",
+    "Searching all ancestor node_modules directories for fallback extensions: JavaScript.",
+    "Directory '/.src/node_modules' does not exist, skipping all lookups in it.",
+    "Directory '/node_modules' does not exist, skipping all lookups in it.",
+    "======== Module name '@typescript/lib-esnext/iterator' was not resolved. ========",
+    "File '/.ts/package.json' does not exist according to earlier cached lookups.",
+    "File '/package.json' does not exist according to earlier cached lookups.",
     "======== Resolving module '@typescript/lib-dom' from '/.src/__lib_node_modules_lookup_lib.dom.d.ts__.ts'. ========",
     "Explicitly specified module resolution kind: 'Node10'.",
     "Loading module '@typescript/lib-dom' from 'node_modules' folder, target file types: TypeScript, Declaration.",
diff --git a/tests/baselines/reference/bundlerDirectoryModule(moduleresolution=nodenext).trace.json b/tests/baselines/reference/bundlerDirectoryModule(moduleresolution=nodenext).trace.json
index d20de95869c4e..55ca42917a3ad 100644
--- a/tests/baselines/reference/bundlerDirectoryModule(moduleresolution=nodenext).trace.json
+++ b/tests/baselines/reference/bundlerDirectoryModule(moduleresolution=nodenext).trace.json
@@ -1074,6 +1074,21 @@
     "======== Module name '@typescript/lib-esnext/regexp' was not resolved. ========",
     "File '/.ts/package.json' does not exist according to earlier cached lookups.",
     "File '/package.json' does not exist according to earlier cached lookups.",
+    "======== Resolving module '@typescript/lib-esnext/iterator' from '/.src/__lib_node_modules_lookup_lib.esnext.iterator.d.ts__.ts'. ========",
+    "Explicitly specified module resolution kind: 'Node10'.",
+    "Loading module '@typescript/lib-esnext/iterator' from 'node_modules' folder, target file types: TypeScript, Declaration.",
+    "Searching all ancestor node_modules directories for preferred extensions: TypeScript, Declaration.",
+    "Directory '/.src/node_modules' does not exist, skipping all lookups in it.",
+    "Scoped package detected, looking in 'typescript__lib-esnext/iterator'",
+    "Directory '/node_modules' does not exist, skipping all lookups in it.",
+    "Scoped package detected, looking in 'typescript__lib-esnext/iterator'",
+    "Loading module '@typescript/lib-esnext/iterator' from 'node_modules' folder, target file types: JavaScript.",
+    "Searching all ancestor node_modules directories for fallback extensions: JavaScript.",
+    "Directory '/.src/node_modules' does not exist, skipping all lookups in it.",
+    "Directory '/node_modules' does not exist, skipping all lookups in it.",
+    "======== Module name '@typescript/lib-esnext/iterator' was not resolved. ========",
+    "File '/.ts/package.json' does not exist according to earlier cached lookups.",
+    "File '/package.json' does not exist according to earlier cached lookups.",
     "======== Resolving module '@typescript/lib-dom' from '/.src/__lib_node_modules_lookup_lib.dom.d.ts__.ts'. ========",
     "Explicitly specified module resolution kind: 'Node10'.",
     "Loading module '@typescript/lib-dom' from 'node_modules' folder, target file types: TypeScript, Declaration.",
diff --git a/tests/baselines/reference/config/commandLineParsing/parseCommandLine/Parse --lib option with extra comma.js b/tests/baselines/reference/config/commandLineParsing/parseCommandLine/Parse --lib option with extra comma.js
index 44a56c66ec5b6..cfcd52b395baf 100644
--- a/tests/baselines/reference/config/commandLineParsing/parseCommandLine/Parse --lib option with extra comma.js	
+++ b/tests/baselines/reference/config/commandLineParsing/parseCommandLine/Parse --lib option with extra comma.js	
@@ -10,4 +10,4 @@ WatchOptions::
 FileNames::
 es7,0.ts
 Errors::
-error TS6046: Argument for '--lib' option must be: 'es5', 'es6', 'es2015', 'es7', 'es2016', 'es2017', 'es2018', 'es2019', 'es2020', 'es2021', 'es2022', 'es2023', 'esnext', 'dom', 'dom.iterable', 'dom.asynciterable', 'webworker', 'webworker.importscripts', 'webworker.iterable', 'webworker.asynciterable', 'scripthost', 'es2015.core', 'es2015.collection', 'es2015.generator', 'es2015.iterable', 'es2015.promise', 'es2015.proxy', 'es2015.reflect', 'es2015.symbol', 'es2015.symbol.wellknown', 'es2016.array.include', 'es2016.intl', 'es2017.date', 'es2017.object', 'es2017.sharedmemory', 'es2017.string', 'es2017.intl', 'es2017.typedarrays', 'es2018.asyncgenerator', 'es2018.asynciterable', 'es2018.intl', 'es2018.promise', 'es2018.regexp', 'es2019.array', 'es2019.object', 'es2019.string', 'es2019.symbol', 'es2019.intl', 'es2020.bigint', 'es2020.date', 'es2020.promise', 'es2020.sharedmemory', 'es2020.string', 'es2020.symbol.wellknown', 'es2020.intl', 'es2020.number', 'es2021.promise', 'es2021.string', 'es2021.weakref', 'es2021.intl', 'es2022.array', 'es2022.error', 'es2022.intl', 'es2022.object', 'es2022.sharedmemory', 'es2022.string', 'es2022.regexp', 'es2023.array', 'es2023.collection', 'es2023.intl', 'esnext.array', 'esnext.collection', 'esnext.symbol', 'esnext.asynciterable', 'esnext.intl', 'esnext.disposable', 'esnext.bigint', 'esnext.string', 'esnext.promise', 'esnext.weakref', 'esnext.decorators', 'esnext.object', 'esnext.regexp', 'decorators', 'decorators.legacy'.
+error TS6046: Argument for '--lib' option must be: 'es5', 'es6', 'es2015', 'es7', 'es2016', 'es2017', 'es2018', 'es2019', 'es2020', 'es2021', 'es2022', 'es2023', 'esnext', 'dom', 'dom.iterable', 'dom.asynciterable', 'webworker', 'webworker.importscripts', 'webworker.iterable', 'webworker.asynciterable', 'scripthost', 'es2015.core', 'es2015.collection', 'es2015.generator', 'es2015.iterable', 'es2015.promise', 'es2015.proxy', 'es2015.reflect', 'es2015.symbol', 'es2015.symbol.wellknown', 'es2016.array.include', 'es2016.intl', 'es2017.date', 'es2017.object', 'es2017.sharedmemory', 'es2017.string', 'es2017.intl', 'es2017.typedarrays', 'es2018.asyncgenerator', 'es2018.asynciterable', 'es2018.intl', 'es2018.promise', 'es2018.regexp', 'es2019.array', 'es2019.object', 'es2019.string', 'es2019.symbol', 'es2019.intl', 'es2020.bigint', 'es2020.date', 'es2020.promise', 'es2020.sharedmemory', 'es2020.string', 'es2020.symbol.wellknown', 'es2020.intl', 'es2020.number', 'es2021.promise', 'es2021.string', 'es2021.weakref', 'es2021.intl', 'es2022.array', 'es2022.error', 'es2022.intl', 'es2022.object', 'es2022.sharedmemory', 'es2022.string', 'es2022.regexp', 'es2023.array', 'es2023.collection', 'es2023.intl', 'esnext.array', 'esnext.collection', 'esnext.symbol', 'esnext.asynciterable', 'esnext.intl', 'esnext.disposable', 'esnext.bigint', 'esnext.string', 'esnext.promise', 'esnext.weakref', 'esnext.decorators', 'esnext.object', 'esnext.regexp', 'esnext.iterator', 'decorators', 'decorators.legacy'.
diff --git a/tests/baselines/reference/config/commandLineParsing/parseCommandLine/Parse --lib option with trailing white-space.js b/tests/baselines/reference/config/commandLineParsing/parseCommandLine/Parse --lib option with trailing white-space.js
index 87aeb7b21a2f3..596b4249a3c7a 100644
--- a/tests/baselines/reference/config/commandLineParsing/parseCommandLine/Parse --lib option with trailing white-space.js	
+++ b/tests/baselines/reference/config/commandLineParsing/parseCommandLine/Parse --lib option with trailing white-space.js	
@@ -10,4 +10,4 @@ WatchOptions::
 FileNames::
 es7,0.ts
 Errors::
-error TS6046: Argument for '--lib' option must be: 'es5', 'es6', 'es2015', 'es7', 'es2016', 'es2017', 'es2018', 'es2019', 'es2020', 'es2021', 'es2022', 'es2023', 'esnext', 'dom', 'dom.iterable', 'dom.asynciterable', 'webworker', 'webworker.importscripts', 'webworker.iterable', 'webworker.asynciterable', 'scripthost', 'es2015.core', 'es2015.collection', 'es2015.generator', 'es2015.iterable', 'es2015.promise', 'es2015.proxy', 'es2015.reflect', 'es2015.symbol', 'es2015.symbol.wellknown', 'es2016.array.include', 'es2016.intl', 'es2017.date', 'es2017.object', 'es2017.sharedmemory', 'es2017.string', 'es2017.intl', 'es2017.typedarrays', 'es2018.asyncgenerator', 'es2018.asynciterable', 'es2018.intl', 'es2018.promise', 'es2018.regexp', 'es2019.array', 'es2019.object', 'es2019.string', 'es2019.symbol', 'es2019.intl', 'es2020.bigint', 'es2020.date', 'es2020.promise', 'es2020.sharedmemory', 'es2020.string', 'es2020.symbol.wellknown', 'es2020.intl', 'es2020.number', 'es2021.promise', 'es2021.string', 'es2021.weakref', 'es2021.intl', 'es2022.array', 'es2022.error', 'es2022.intl', 'es2022.object', 'es2022.sharedmemory', 'es2022.string', 'es2022.regexp', 'es2023.array', 'es2023.collection', 'es2023.intl', 'esnext.array', 'esnext.collection', 'esnext.symbol', 'esnext.asynciterable', 'esnext.intl', 'esnext.disposable', 'esnext.bigint', 'esnext.string', 'esnext.promise', 'esnext.weakref', 'esnext.decorators', 'esnext.object', 'esnext.regexp', 'decorators', 'decorators.legacy'.
+error TS6046: Argument for '--lib' option must be: 'es5', 'es6', 'es2015', 'es7', 'es2016', 'es2017', 'es2018', 'es2019', 'es2020', 'es2021', 'es2022', 'es2023', 'esnext', 'dom', 'dom.iterable', 'dom.asynciterable', 'webworker', 'webworker.importscripts', 'webworker.iterable', 'webworker.asynciterable', 'scripthost', 'es2015.core', 'es2015.collection', 'es2015.generator', 'es2015.iterable', 'es2015.promise', 'es2015.proxy', 'es2015.reflect', 'es2015.symbol', 'es2015.symbol.wellknown', 'es2016.array.include', 'es2016.intl', 'es2017.date', 'es2017.object', 'es2017.sharedmemory', 'es2017.string', 'es2017.intl', 'es2017.typedarrays', 'es2018.asyncgenerator', 'es2018.asynciterable', 'es2018.intl', 'es2018.promise', 'es2018.regexp', 'es2019.array', 'es2019.object', 'es2019.string', 'es2019.symbol', 'es2019.intl', 'es2020.bigint', 'es2020.date', 'es2020.promise', 'es2020.sharedmemory', 'es2020.string', 'es2020.symbol.wellknown', 'es2020.intl', 'es2020.number', 'es2021.promise', 'es2021.string', 'es2021.weakref', 'es2021.intl', 'es2022.array', 'es2022.error', 'es2022.intl', 'es2022.object', 'es2022.sharedmemory', 'es2022.string', 'es2022.regexp', 'es2023.array', 'es2023.collection', 'es2023.intl', 'esnext.array', 'esnext.collection', 'esnext.symbol', 'esnext.asynciterable', 'esnext.intl', 'esnext.disposable', 'esnext.bigint', 'esnext.string', 'esnext.promise', 'esnext.weakref', 'esnext.decorators', 'esnext.object', 'esnext.regexp', 'esnext.iterator', 'decorators', 'decorators.legacy'.
diff --git a/tests/baselines/reference/config/commandLineParsing/parseCommandLine/Parse invalid option of library flags.js b/tests/baselines/reference/config/commandLineParsing/parseCommandLine/Parse invalid option of library flags.js
index 0213cdbf5b8cd..807f4f9583f0f 100644
--- a/tests/baselines/reference/config/commandLineParsing/parseCommandLine/Parse invalid option of library flags.js	
+++ b/tests/baselines/reference/config/commandLineParsing/parseCommandLine/Parse invalid option of library flags.js	
@@ -10,4 +10,4 @@ WatchOptions::
 FileNames::
 0.ts
 Errors::
-error TS6046: Argument for '--lib' option must be: 'es5', 'es6', 'es2015', 'es7', 'es2016', 'es2017', 'es2018', 'es2019', 'es2020', 'es2021', 'es2022', 'es2023', 'esnext', 'dom', 'dom.iterable', 'dom.asynciterable', 'webworker', 'webworker.importscripts', 'webworker.iterable', 'webworker.asynciterable', 'scripthost', 'es2015.core', 'es2015.collection', 'es2015.generator', 'es2015.iterable', 'es2015.promise', 'es2015.proxy', 'es2015.reflect', 'es2015.symbol', 'es2015.symbol.wellknown', 'es2016.array.include', 'es2016.intl', 'es2017.date', 'es2017.object', 'es2017.sharedmemory', 'es2017.string', 'es2017.intl', 'es2017.typedarrays', 'es2018.asyncgenerator', 'es2018.asynciterable', 'es2018.intl', 'es2018.promise', 'es2018.regexp', 'es2019.array', 'es2019.object', 'es2019.string', 'es2019.symbol', 'es2019.intl', 'es2020.bigint', 'es2020.date', 'es2020.promise', 'es2020.sharedmemory', 'es2020.string', 'es2020.symbol.wellknown', 'es2020.intl', 'es2020.number', 'es2021.promise', 'es2021.string', 'es2021.weakref', 'es2021.intl', 'es2022.array', 'es2022.error', 'es2022.intl', 'es2022.object', 'es2022.sharedmemory', 'es2022.string', 'es2022.regexp', 'es2023.array', 'es2023.collection', 'es2023.intl', 'esnext.array', 'esnext.collection', 'esnext.symbol', 'esnext.asynciterable', 'esnext.intl', 'esnext.disposable', 'esnext.bigint', 'esnext.string', 'esnext.promise', 'esnext.weakref', 'esnext.decorators', 'esnext.object', 'esnext.regexp', 'decorators', 'decorators.legacy'.
+error TS6046: Argument for '--lib' option must be: 'es5', 'es6', 'es2015', 'es7', 'es2016', 'es2017', 'es2018', 'es2019', 'es2020', 'es2021', 'es2022', 'es2023', 'esnext', 'dom', 'dom.iterable', 'dom.asynciterable', 'webworker', 'webworker.importscripts', 'webworker.iterable', 'webworker.asynciterable', 'scripthost', 'es2015.core', 'es2015.collection', 'es2015.generator', 'es2015.iterable', 'es2015.promise', 'es2015.proxy', 'es2015.reflect', 'es2015.symbol', 'es2015.symbol.wellknown', 'es2016.array.include', 'es2016.intl', 'es2017.date', 'es2017.object', 'es2017.sharedmemory', 'es2017.string', 'es2017.intl', 'es2017.typedarrays', 'es2018.asyncgenerator', 'es2018.asynciterable', 'es2018.intl', 'es2018.promise', 'es2018.regexp', 'es2019.array', 'es2019.object', 'es2019.string', 'es2019.symbol', 'es2019.intl', 'es2020.bigint', 'es2020.date', 'es2020.promise', 'es2020.sharedmemory', 'es2020.string', 'es2020.symbol.wellknown', 'es2020.intl', 'es2020.number', 'es2021.promise', 'es2021.string', 'es2021.weakref', 'es2021.intl', 'es2022.array', 'es2022.error', 'es2022.intl', 'es2022.object', 'es2022.sharedmemory', 'es2022.string', 'es2022.regexp', 'es2023.array', 'es2023.collection', 'es2023.intl', 'esnext.array', 'esnext.collection', 'esnext.symbol', 'esnext.asynciterable', 'esnext.intl', 'esnext.disposable', 'esnext.bigint', 'esnext.string', 'esnext.promise', 'esnext.weakref', 'esnext.decorators', 'esnext.object', 'esnext.regexp', 'esnext.iterator', 'decorators', 'decorators.legacy'.
diff --git a/tests/baselines/reference/config/convertCompilerOptionsFromJson/Convert empty string option of libs array to compiler-options with json api.js b/tests/baselines/reference/config/convertCompilerOptionsFromJson/Convert empty string option of libs array to compiler-options with json api.js
index 04028e2fda1d2..29cc5e97530d6 100644
--- a/tests/baselines/reference/config/convertCompilerOptionsFromJson/Convert empty string option of libs array to compiler-options with json api.js	
+++ b/tests/baselines/reference/config/convertCompilerOptionsFromJson/Convert empty string option of libs array to compiler-options with json api.js	
@@ -30,5 +30,5 @@ CompilerOptions::
   "configFilePath": "/apath/tsconfig.json"
 }
 Errors::
-error TS6046: Argument for '--lib' option must be: 'es5', 'es6', 'es2015', 'es7', 'es2016', 'es2017', 'es2018', 'es2019', 'es2020', 'es2021', 'es2022', 'es2023', 'esnext', 'dom', 'dom.iterable', 'dom.asynciterable', 'webworker', 'webworker.importscripts', 'webworker.iterable', 'webworker.asynciterable', 'scripthost', 'es2015.core', 'es2015.collection', 'es2015.generator', 'es2015.iterable', 'es2015.promise', 'es2015.proxy', 'es2015.reflect', 'es2015.symbol', 'es2015.symbol.wellknown', 'es2016.array.include', 'es2016.intl', 'es2017.date', 'es2017.object', 'es2017.sharedmemory', 'es2017.string', 'es2017.intl', 'es2017.typedarrays', 'es2018.asyncgenerator', 'es2018.asynciterable', 'es2018.intl', 'es2018.promise', 'es2018.regexp', 'es2019.array', 'es2019.object', 'es2019.string', 'es2019.symbol', 'es2019.intl', 'es2020.bigint', 'es2020.date', 'es2020.promise', 'es2020.sharedmemory', 'es2020.string', 'es2020.symbol.wellknown', 'es2020.intl', 'es2020.number', 'es2021.promise', 'es2021.string', 'es2021.weakref', 'es2021.intl', 'es2022.array', 'es2022.error', 'es2022.intl', 'es2022.object', 'es2022.sharedmemory', 'es2022.string', 'es2022.regexp', 'es2023.array', 'es2023.collection', 'es2023.intl', 'esnext.array', 'esnext.collection', 'esnext.symbol', 'esnext.asynciterable', 'esnext.intl', 'esnext.disposable', 'esnext.bigint', 'esnext.string', 'esnext.promise', 'esnext.weakref', 'esnext.decorators', 'esnext.object', 'esnext.regexp', 'decorators', 'decorators.legacy'.
+error TS6046: Argument for '--lib' option must be: 'es5', 'es6', 'es2015', 'es7', 'es2016', 'es2017', 'es2018', 'es2019', 'es2020', 'es2021', 'es2022', 'es2023', 'esnext', 'dom', 'dom.iterable', 'dom.asynciterable', 'webworker', 'webworker.importscripts', 'webworker.iterable', 'webworker.asynciterable', 'scripthost', 'es2015.core', 'es2015.collection', 'es2015.generator', 'es2015.iterable', 'es2015.promise', 'es2015.proxy', 'es2015.reflect', 'es2015.symbol', 'es2015.symbol.wellknown', 'es2016.array.include', 'es2016.intl', 'es2017.date', 'es2017.object', 'es2017.sharedmemory', 'es2017.string', 'es2017.intl', 'es2017.typedarrays', 'es2018.asyncgenerator', 'es2018.asynciterable', 'es2018.intl', 'es2018.promise', 'es2018.regexp', 'es2019.array', 'es2019.object', 'es2019.string', 'es2019.symbol', 'es2019.intl', 'es2020.bigint', 'es2020.date', 'es2020.promise', 'es2020.sharedmemory', 'es2020.string', 'es2020.symbol.wellknown', 'es2020.intl', 'es2020.number', 'es2021.promise', 'es2021.string', 'es2021.weakref', 'es2021.intl', 'es2022.array', 'es2022.error', 'es2022.intl', 'es2022.object', 'es2022.sharedmemory', 'es2022.string', 'es2022.regexp', 'es2023.array', 'es2023.collection', 'es2023.intl', 'esnext.array', 'esnext.collection', 'esnext.symbol', 'esnext.asynciterable', 'esnext.intl', 'esnext.disposable', 'esnext.bigint', 'esnext.string', 'esnext.promise', 'esnext.weakref', 'esnext.decorators', 'esnext.object', 'esnext.regexp', 'esnext.iterator', 'decorators', 'decorators.legacy'.
 
diff --git a/tests/baselines/reference/config/convertCompilerOptionsFromJson/Convert empty string option of libs array to compiler-options with jsonSourceFile api.js b/tests/baselines/reference/config/convertCompilerOptionsFromJson/Convert empty string option of libs array to compiler-options with jsonSourceFile api.js
index 768504a015812..5166204b479ea 100644
--- a/tests/baselines/reference/config/convertCompilerOptionsFromJson/Convert empty string option of libs array to compiler-options with jsonSourceFile api.js	
+++ b/tests/baselines/reference/config/convertCompilerOptionsFromJson/Convert empty string option of libs array to compiler-options with jsonSourceFile api.js	
@@ -30,7 +30,7 @@ CompilerOptions::
   "configFilePath": "/apath/tsconfig.json"
 }
 Errors::
-tsconfig.json:8:7 - error TS6046: Argument for '--lib' option must be: 'es5', 'es6', 'es2015', 'es7', 'es2016', 'es2017', 'es2018', 'es2019', 'es2020', 'es2021', 'es2022', 'es2023', 'esnext', 'dom', 'dom.iterable', 'dom.asynciterable', 'webworker', 'webworker.importscripts', 'webworker.iterable', 'webworker.asynciterable', 'scripthost', 'es2015.core', 'es2015.collection', 'es2015.generator', 'es2015.iterable', 'es2015.promise', 'es2015.proxy', 'es2015.reflect', 'es2015.symbol', 'es2015.symbol.wellknown', 'es2016.array.include', 'es2016.intl', 'es2017.date', 'es2017.object', 'es2017.sharedmemory', 'es2017.string', 'es2017.intl', 'es2017.typedarrays', 'es2018.asyncgenerator', 'es2018.asynciterable', 'es2018.intl', 'es2018.promise', 'es2018.regexp', 'es2019.array', 'es2019.object', 'es2019.string', 'es2019.symbol', 'es2019.intl', 'es2020.bigint', 'es2020.date', 'es2020.promise', 'es2020.sharedmemory', 'es2020.string', 'es2020.symbol.wellknown', 'es2020.intl', 'es2020.number', 'es2021.promise', 'es2021.string', 'es2021.weakref', 'es2021.intl', 'es2022.array', 'es2022.error', 'es2022.intl', 'es2022.object', 'es2022.sharedmemory', 'es2022.string', 'es2022.regexp', 'es2023.array', 'es2023.collection', 'es2023.intl', 'esnext.array', 'esnext.collection', 'esnext.symbol', 'esnext.asynciterable', 'esnext.intl', 'esnext.disposable', 'esnext.bigint', 'esnext.string', 'esnext.promise', 'esnext.weakref', 'esnext.decorators', 'esnext.object', 'esnext.regexp', 'decorators', 'decorators.legacy'.
+tsconfig.json:8:7 - error TS6046: Argument for '--lib' option must be: 'es5', 'es6', 'es2015', 'es7', 'es2016', 'es2017', 'es2018', 'es2019', 'es2020', 'es2021', 'es2022', 'es2023', 'esnext', 'dom', 'dom.iterable', 'dom.asynciterable', 'webworker', 'webworker.importscripts', 'webworker.iterable', 'webworker.asynciterable', 'scripthost', 'es2015.core', 'es2015.collection', 'es2015.generator', 'es2015.iterable', 'es2015.promise', 'es2015.proxy', 'es2015.reflect', 'es2015.symbol', 'es2015.symbol.wellknown', 'es2016.array.include', 'es2016.intl', 'es2017.date', 'es2017.object', 'es2017.sharedmemory', 'es2017.string', 'es2017.intl', 'es2017.typedarrays', 'es2018.asyncgenerator', 'es2018.asynciterable', 'es2018.intl', 'es2018.promise', 'es2018.regexp', 'es2019.array', 'es2019.object', 'es2019.string', 'es2019.symbol', 'es2019.intl', 'es2020.bigint', 'es2020.date', 'es2020.promise', 'es2020.sharedmemory', 'es2020.string', 'es2020.symbol.wellknown', 'es2020.intl', 'es2020.number', 'es2021.promise', 'es2021.string', 'es2021.weakref', 'es2021.intl', 'es2022.array', 'es2022.error', 'es2022.intl', 'es2022.object', 'es2022.sharedmemory', 'es2022.string', 'es2022.regexp', 'es2023.array', 'es2023.collection', 'es2023.intl', 'esnext.array', 'esnext.collection', 'esnext.symbol', 'esnext.asynciterable', 'esnext.intl', 'esnext.disposable', 'esnext.bigint', 'esnext.string', 'esnext.promise', 'esnext.weakref', 'esnext.decorators', 'esnext.object', 'esnext.regexp', 'esnext.iterator', 'decorators', 'decorators.legacy'.
 
 8       ""
         ~~
diff --git a/tests/baselines/reference/config/convertCompilerOptionsFromJson/Convert empty string option of libs to compiler-options with json api.js b/tests/baselines/reference/config/convertCompilerOptionsFromJson/Convert empty string option of libs to compiler-options with json api.js
index 12cd9f9a69f6e..1256fcb0be357 100644
--- a/tests/baselines/reference/config/convertCompilerOptionsFromJson/Convert empty string option of libs to compiler-options with json api.js	
+++ b/tests/baselines/reference/config/convertCompilerOptionsFromJson/Convert empty string option of libs to compiler-options with json api.js	
@@ -33,5 +33,5 @@ CompilerOptions::
   "configFilePath": "/apath/tsconfig.json"
 }
 Errors::
-error TS6046: Argument for '--lib' option must be: 'es5', 'es6', 'es2015', 'es7', 'es2016', 'es2017', 'es2018', 'es2019', 'es2020', 'es2021', 'es2022', 'es2023', 'esnext', 'dom', 'dom.iterable', 'dom.asynciterable', 'webworker', 'webworker.importscripts', 'webworker.iterable', 'webworker.asynciterable', 'scripthost', 'es2015.core', 'es2015.collection', 'es2015.generator', 'es2015.iterable', 'es2015.promise', 'es2015.proxy', 'es2015.reflect', 'es2015.symbol', 'es2015.symbol.wellknown', 'es2016.array.include', 'es2016.intl', 'es2017.date', 'es2017.object', 'es2017.sharedmemory', 'es2017.string', 'es2017.intl', 'es2017.typedarrays', 'es2018.asyncgenerator', 'es2018.asynciterable', 'es2018.intl', 'es2018.promise', 'es2018.regexp', 'es2019.array', 'es2019.object', 'es2019.string', 'es2019.symbol', 'es2019.intl', 'es2020.bigint', 'es2020.date', 'es2020.promise', 'es2020.sharedmemory', 'es2020.string', 'es2020.symbol.wellknown', 'es2020.intl', 'es2020.number', 'es2021.promise', 'es2021.string', 'es2021.weakref', 'es2021.intl', 'es2022.array', 'es2022.error', 'es2022.intl', 'es2022.object', 'es2022.sharedmemory', 'es2022.string', 'es2022.regexp', 'es2023.array', 'es2023.collection', 'es2023.intl', 'esnext.array', 'esnext.collection', 'esnext.symbol', 'esnext.asynciterable', 'esnext.intl', 'esnext.disposable', 'esnext.bigint', 'esnext.string', 'esnext.promise', 'esnext.weakref', 'esnext.decorators', 'esnext.object', 'esnext.regexp', 'decorators', 'decorators.legacy'.
+error TS6046: Argument for '--lib' option must be: 'es5', 'es6', 'es2015', 'es7', 'es2016', 'es2017', 'es2018', 'es2019', 'es2020', 'es2021', 'es2022', 'es2023', 'esnext', 'dom', 'dom.iterable', 'dom.asynciterable', 'webworker', 'webworker.importscripts', 'webworker.iterable', 'webworker.asynciterable', 'scripthost', 'es2015.core', 'es2015.collection', 'es2015.generator', 'es2015.iterable', 'es2015.promise', 'es2015.proxy', 'es2015.reflect', 'es2015.symbol', 'es2015.symbol.wellknown', 'es2016.array.include', 'es2016.intl', 'es2017.date', 'es2017.object', 'es2017.sharedmemory', 'es2017.string', 'es2017.intl', 'es2017.typedarrays', 'es2018.asyncgenerator', 'es2018.asynciterable', 'es2018.intl', 'es2018.promise', 'es2018.regexp', 'es2019.array', 'es2019.object', 'es2019.string', 'es2019.symbol', 'es2019.intl', 'es2020.bigint', 'es2020.date', 'es2020.promise', 'es2020.sharedmemory', 'es2020.string', 'es2020.symbol.wellknown', 'es2020.intl', 'es2020.number', 'es2021.promise', 'es2021.string', 'es2021.weakref', 'es2021.intl', 'es2022.array', 'es2022.error', 'es2022.intl', 'es2022.object', 'es2022.sharedmemory', 'es2022.string', 'es2022.regexp', 'es2023.array', 'es2023.collection', 'es2023.intl', 'esnext.array', 'esnext.collection', 'esnext.symbol', 'esnext.asynciterable', 'esnext.intl', 'esnext.disposable', 'esnext.bigint', 'esnext.string', 'esnext.promise', 'esnext.weakref', 'esnext.decorators', 'esnext.object', 'esnext.regexp', 'esnext.iterator', 'decorators', 'decorators.legacy'.
 
diff --git a/tests/baselines/reference/config/convertCompilerOptionsFromJson/Convert empty string option of libs to compiler-options with jsonSourceFile api.js b/tests/baselines/reference/config/convertCompilerOptionsFromJson/Convert empty string option of libs to compiler-options with jsonSourceFile api.js
index b220f686852a8..db849a0aecc78 100644
--- a/tests/baselines/reference/config/convertCompilerOptionsFromJson/Convert empty string option of libs to compiler-options with jsonSourceFile api.js	
+++ b/tests/baselines/reference/config/convertCompilerOptionsFromJson/Convert empty string option of libs to compiler-options with jsonSourceFile api.js	
@@ -33,7 +33,7 @@ CompilerOptions::
   "configFilePath": "/apath/tsconfig.json"
 }
 Errors::
-tsconfig.json:9:7 - error TS6046: Argument for '--lib' option must be: 'es5', 'es6', 'es2015', 'es7', 'es2016', 'es2017', 'es2018', 'es2019', 'es2020', 'es2021', 'es2022', 'es2023', 'esnext', 'dom', 'dom.iterable', 'dom.asynciterable', 'webworker', 'webworker.importscripts', 'webworker.iterable', 'webworker.asynciterable', 'scripthost', 'es2015.core', 'es2015.collection', 'es2015.generator', 'es2015.iterable', 'es2015.promise', 'es2015.proxy', 'es2015.reflect', 'es2015.symbol', 'es2015.symbol.wellknown', 'es2016.array.include', 'es2016.intl', 'es2017.date', 'es2017.object', 'es2017.sharedmemory', 'es2017.string', 'es2017.intl', 'es2017.typedarrays', 'es2018.asyncgenerator', 'es2018.asynciterable', 'es2018.intl', 'es2018.promise', 'es2018.regexp', 'es2019.array', 'es2019.object', 'es2019.string', 'es2019.symbol', 'es2019.intl', 'es2020.bigint', 'es2020.date', 'es2020.promise', 'es2020.sharedmemory', 'es2020.string', 'es2020.symbol.wellknown', 'es2020.intl', 'es2020.number', 'es2021.promise', 'es2021.string', 'es2021.weakref', 'es2021.intl', 'es2022.array', 'es2022.error', 'es2022.intl', 'es2022.object', 'es2022.sharedmemory', 'es2022.string', 'es2022.regexp', 'es2023.array', 'es2023.collection', 'es2023.intl', 'esnext.array', 'esnext.collection', 'esnext.symbol', 'esnext.asynciterable', 'esnext.intl', 'esnext.disposable', 'esnext.bigint', 'esnext.string', 'esnext.promise', 'esnext.weakref', 'esnext.decorators', 'esnext.object', 'esnext.regexp', 'decorators', 'decorators.legacy'.
+tsconfig.json:9:7 - error TS6046: Argument for '--lib' option must be: 'es5', 'es6', 'es2015', 'es7', 'es2016', 'es2017', 'es2018', 'es2019', 'es2020', 'es2021', 'es2022', 'es2023', 'esnext', 'dom', 'dom.iterable', 'dom.asynciterable', 'webworker', 'webworker.importscripts', 'webworker.iterable', 'webworker.asynciterable', 'scripthost', 'es2015.core', 'es2015.collection', 'es2015.generator', 'es2015.iterable', 'es2015.promise', 'es2015.proxy', 'es2015.reflect', 'es2015.symbol', 'es2015.symbol.wellknown', 'es2016.array.include', 'es2016.intl', 'es2017.date', 'es2017.object', 'es2017.sharedmemory', 'es2017.string', 'es2017.intl', 'es2017.typedarrays', 'es2018.asyncgenerator', 'es2018.asynciterable', 'es2018.intl', 'es2018.promise', 'es2018.regexp', 'es2019.array', 'es2019.object', 'es2019.string', 'es2019.symbol', 'es2019.intl', 'es2020.bigint', 'es2020.date', 'es2020.promise', 'es2020.sharedmemory', 'es2020.string', 'es2020.symbol.wellknown', 'es2020.intl', 'es2020.number', 'es2021.promise', 'es2021.string', 'es2021.weakref', 'es2021.intl', 'es2022.array', 'es2022.error', 'es2022.intl', 'es2022.object', 'es2022.sharedmemory', 'es2022.string', 'es2022.regexp', 'es2023.array', 'es2023.collection', 'es2023.intl', 'esnext.array', 'esnext.collection', 'esnext.symbol', 'esnext.asynciterable', 'esnext.intl', 'esnext.disposable', 'esnext.bigint', 'esnext.string', 'esnext.promise', 'esnext.weakref', 'esnext.decorators', 'esnext.object', 'esnext.regexp', 'esnext.iterator', 'decorators', 'decorators.legacy'.
 
 9       ""
         ~~
diff --git a/tests/baselines/reference/config/convertCompilerOptionsFromJson/Convert incorrect option of libs to compiler-options with json api.js b/tests/baselines/reference/config/convertCompilerOptionsFromJson/Convert incorrect option of libs to compiler-options with json api.js
index 53df38f31b261..e1d795e42bd20 100644
--- a/tests/baselines/reference/config/convertCompilerOptionsFromJson/Convert incorrect option of libs to compiler-options with json api.js	
+++ b/tests/baselines/reference/config/convertCompilerOptionsFromJson/Convert incorrect option of libs to compiler-options with json api.js	
@@ -35,5 +35,5 @@ CompilerOptions::
   "configFilePath": "/apath/tsconfig.json"
 }
 Errors::
-error TS6046: Argument for '--lib' option must be: 'es5', 'es6', 'es2015', 'es7', 'es2016', 'es2017', 'es2018', 'es2019', 'es2020', 'es2021', 'es2022', 'es2023', 'esnext', 'dom', 'dom.iterable', 'dom.asynciterable', 'webworker', 'webworker.importscripts', 'webworker.iterable', 'webworker.asynciterable', 'scripthost', 'es2015.core', 'es2015.collection', 'es2015.generator', 'es2015.iterable', 'es2015.promise', 'es2015.proxy', 'es2015.reflect', 'es2015.symbol', 'es2015.symbol.wellknown', 'es2016.array.include', 'es2016.intl', 'es2017.date', 'es2017.object', 'es2017.sharedmemory', 'es2017.string', 'es2017.intl', 'es2017.typedarrays', 'es2018.asyncgenerator', 'es2018.asynciterable', 'es2018.intl', 'es2018.promise', 'es2018.regexp', 'es2019.array', 'es2019.object', 'es2019.string', 'es2019.symbol', 'es2019.intl', 'es2020.bigint', 'es2020.date', 'es2020.promise', 'es2020.sharedmemory', 'es2020.string', 'es2020.symbol.wellknown', 'es2020.intl', 'es2020.number', 'es2021.promise', 'es2021.string', 'es2021.weakref', 'es2021.intl', 'es2022.array', 'es2022.error', 'es2022.intl', 'es2022.object', 'es2022.sharedmemory', 'es2022.string', 'es2022.regexp', 'es2023.array', 'es2023.collection', 'es2023.intl', 'esnext.array', 'esnext.collection', 'esnext.symbol', 'esnext.asynciterable', 'esnext.intl', 'esnext.disposable', 'esnext.bigint', 'esnext.string', 'esnext.promise', 'esnext.weakref', 'esnext.decorators', 'esnext.object', 'esnext.regexp', 'decorators', 'decorators.legacy'.
+error TS6046: Argument for '--lib' option must be: 'es5', 'es6', 'es2015', 'es7', 'es2016', 'es2017', 'es2018', 'es2019', 'es2020', 'es2021', 'es2022', 'es2023', 'esnext', 'dom', 'dom.iterable', 'dom.asynciterable', 'webworker', 'webworker.importscripts', 'webworker.iterable', 'webworker.asynciterable', 'scripthost', 'es2015.core', 'es2015.collection', 'es2015.generator', 'es2015.iterable', 'es2015.promise', 'es2015.proxy', 'es2015.reflect', 'es2015.symbol', 'es2015.symbol.wellknown', 'es2016.array.include', 'es2016.intl', 'es2017.date', 'es2017.object', 'es2017.sharedmemory', 'es2017.string', 'es2017.intl', 'es2017.typedarrays', 'es2018.asyncgenerator', 'es2018.asynciterable', 'es2018.intl', 'es2018.promise', 'es2018.regexp', 'es2019.array', 'es2019.object', 'es2019.string', 'es2019.symbol', 'es2019.intl', 'es2020.bigint', 'es2020.date', 'es2020.promise', 'es2020.sharedmemory', 'es2020.string', 'es2020.symbol.wellknown', 'es2020.intl', 'es2020.number', 'es2021.promise', 'es2021.string', 'es2021.weakref', 'es2021.intl', 'es2022.array', 'es2022.error', 'es2022.intl', 'es2022.object', 'es2022.sharedmemory', 'es2022.string', 'es2022.regexp', 'es2023.array', 'es2023.collection', 'es2023.intl', 'esnext.array', 'esnext.collection', 'esnext.symbol', 'esnext.asynciterable', 'esnext.intl', 'esnext.disposable', 'esnext.bigint', 'esnext.string', 'esnext.promise', 'esnext.weakref', 'esnext.decorators', 'esnext.object', 'esnext.regexp', 'esnext.iterator', 'decorators', 'decorators.legacy'.
 
diff --git a/tests/baselines/reference/config/convertCompilerOptionsFromJson/Convert incorrect option of libs to compiler-options with jsonSourceFile api.js b/tests/baselines/reference/config/convertCompilerOptionsFromJson/Convert incorrect option of libs to compiler-options with jsonSourceFile api.js
index d528f18a59522..21f96c3a576ad 100644
--- a/tests/baselines/reference/config/convertCompilerOptionsFromJson/Convert incorrect option of libs to compiler-options with jsonSourceFile api.js	
+++ b/tests/baselines/reference/config/convertCompilerOptionsFromJson/Convert incorrect option of libs to compiler-options with jsonSourceFile api.js	
@@ -35,7 +35,7 @@ CompilerOptions::
   "configFilePath": "/apath/tsconfig.json"
 }
 Errors::
-tsconfig.json:10:7 - error TS6046: Argument for '--lib' option must be: 'es5', 'es6', 'es2015', 'es7', 'es2016', 'es2017', 'es2018', 'es2019', 'es2020', 'es2021', 'es2022', 'es2023', 'esnext', 'dom', 'dom.iterable', 'dom.asynciterable', 'webworker', 'webworker.importscripts', 'webworker.iterable', 'webworker.asynciterable', 'scripthost', 'es2015.core', 'es2015.collection', 'es2015.generator', 'es2015.iterable', 'es2015.promise', 'es2015.proxy', 'es2015.reflect', 'es2015.symbol', 'es2015.symbol.wellknown', 'es2016.array.include', 'es2016.intl', 'es2017.date', 'es2017.object', 'es2017.sharedmemory', 'es2017.string', 'es2017.intl', 'es2017.typedarrays', 'es2018.asyncgenerator', 'es2018.asynciterable', 'es2018.intl', 'es2018.promise', 'es2018.regexp', 'es2019.array', 'es2019.object', 'es2019.string', 'es2019.symbol', 'es2019.intl', 'es2020.bigint', 'es2020.date', 'es2020.promise', 'es2020.sharedmemory', 'es2020.string', 'es2020.symbol.wellknown', 'es2020.intl', 'es2020.number', 'es2021.promise', 'es2021.string', 'es2021.weakref', 'es2021.intl', 'es2022.array', 'es2022.error', 'es2022.intl', 'es2022.object', 'es2022.sharedmemory', 'es2022.string', 'es2022.regexp', 'es2023.array', 'es2023.collection', 'es2023.intl', 'esnext.array', 'esnext.collection', 'esnext.symbol', 'esnext.asynciterable', 'esnext.intl', 'esnext.disposable', 'esnext.bigint', 'esnext.string', 'esnext.promise', 'esnext.weakref', 'esnext.decorators', 'esnext.object', 'esnext.regexp', 'decorators', 'decorators.legacy'.
+tsconfig.json:10:7 - error TS6046: Argument for '--lib' option must be: 'es5', 'es6', 'es2015', 'es7', 'es2016', 'es2017', 'es2018', 'es2019', 'es2020', 'es2021', 'es2022', 'es2023', 'esnext', 'dom', 'dom.iterable', 'dom.asynciterable', 'webworker', 'webworker.importscripts', 'webworker.iterable', 'webworker.asynciterable', 'scripthost', 'es2015.core', 'es2015.collection', 'es2015.generator', 'es2015.iterable', 'es2015.promise', 'es2015.proxy', 'es2015.reflect', 'es2015.symbol', 'es2015.symbol.wellknown', 'es2016.array.include', 'es2016.intl', 'es2017.date', 'es2017.object', 'es2017.sharedmemory', 'es2017.string', 'es2017.intl', 'es2017.typedarrays', 'es2018.asyncgenerator', 'es2018.asynciterable', 'es2018.intl', 'es2018.promise', 'es2018.regexp', 'es2019.array', 'es2019.object', 'es2019.string', 'es2019.symbol', 'es2019.intl', 'es2020.bigint', 'es2020.date', 'es2020.promise', 'es2020.sharedmemory', 'es2020.string', 'es2020.symbol.wellknown', 'es2020.intl', 'es2020.number', 'es2021.promise', 'es2021.string', 'es2021.weakref', 'es2021.intl', 'es2022.array', 'es2022.error', 'es2022.intl', 'es2022.object', 'es2022.sharedmemory', 'es2022.string', 'es2022.regexp', 'es2023.array', 'es2023.collection', 'es2023.intl', 'esnext.array', 'esnext.collection', 'esnext.symbol', 'esnext.asynciterable', 'esnext.intl', 'esnext.disposable', 'esnext.bigint', 'esnext.string', 'esnext.promise', 'esnext.weakref', 'esnext.decorators', 'esnext.object', 'esnext.regexp', 'esnext.iterator', 'decorators', 'decorators.legacy'.
 
 10       "incorrectLib"
          ~~~~~~~~~~~~~~
diff --git a/tests/baselines/reference/config/convertCompilerOptionsFromJson/Convert trailing-whitespace string option of libs to compiler-options with json api.js b/tests/baselines/reference/config/convertCompilerOptionsFromJson/Convert trailing-whitespace string option of libs to compiler-options with json api.js
index 910344faabca5..b4f79a2e2c1f5 100644
--- a/tests/baselines/reference/config/convertCompilerOptionsFromJson/Convert trailing-whitespace string option of libs to compiler-options with json api.js	
+++ b/tests/baselines/reference/config/convertCompilerOptionsFromJson/Convert trailing-whitespace string option of libs to compiler-options with json api.js	
@@ -30,5 +30,5 @@ CompilerOptions::
   "configFilePath": "/apath/tsconfig.json"
 }
 Errors::
-error TS6046: Argument for '--lib' option must be: 'es5', 'es6', 'es2015', 'es7', 'es2016', 'es2017', 'es2018', 'es2019', 'es2020', 'es2021', 'es2022', 'es2023', 'esnext', 'dom', 'dom.iterable', 'dom.asynciterable', 'webworker', 'webworker.importscripts', 'webworker.iterable', 'webworker.asynciterable', 'scripthost', 'es2015.core', 'es2015.collection', 'es2015.generator', 'es2015.iterable', 'es2015.promise', 'es2015.proxy', 'es2015.reflect', 'es2015.symbol', 'es2015.symbol.wellknown', 'es2016.array.include', 'es2016.intl', 'es2017.date', 'es2017.object', 'es2017.sharedmemory', 'es2017.string', 'es2017.intl', 'es2017.typedarrays', 'es2018.asyncgenerator', 'es2018.asynciterable', 'es2018.intl', 'es2018.promise', 'es2018.regexp', 'es2019.array', 'es2019.object', 'es2019.string', 'es2019.symbol', 'es2019.intl', 'es2020.bigint', 'es2020.date', 'es2020.promise', 'es2020.sharedmemory', 'es2020.string', 'es2020.symbol.wellknown', 'es2020.intl', 'es2020.number', 'es2021.promise', 'es2021.string', 'es2021.weakref', 'es2021.intl', 'es2022.array', 'es2022.error', 'es2022.intl', 'es2022.object', 'es2022.sharedmemory', 'es2022.string', 'es2022.regexp', 'es2023.array', 'es2023.collection', 'es2023.intl', 'esnext.array', 'esnext.collection', 'esnext.symbol', 'esnext.asynciterable', 'esnext.intl', 'esnext.disposable', 'esnext.bigint', 'esnext.string', 'esnext.promise', 'esnext.weakref', 'esnext.decorators', 'esnext.object', 'esnext.regexp', 'decorators', 'decorators.legacy'.
+error TS6046: Argument for '--lib' option must be: 'es5', 'es6', 'es2015', 'es7', 'es2016', 'es2017', 'es2018', 'es2019', 'es2020', 'es2021', 'es2022', 'es2023', 'esnext', 'dom', 'dom.iterable', 'dom.asynciterable', 'webworker', 'webworker.importscripts', 'webworker.iterable', 'webworker.asynciterable', 'scripthost', 'es2015.core', 'es2015.collection', 'es2015.generator', 'es2015.iterable', 'es2015.promise', 'es2015.proxy', 'es2015.reflect', 'es2015.symbol', 'es2015.symbol.wellknown', 'es2016.array.include', 'es2016.intl', 'es2017.date', 'es2017.object', 'es2017.sharedmemory', 'es2017.string', 'es2017.intl', 'es2017.typedarrays', 'es2018.asyncgenerator', 'es2018.asynciterable', 'es2018.intl', 'es2018.promise', 'es2018.regexp', 'es2019.array', 'es2019.object', 'es2019.string', 'es2019.symbol', 'es2019.intl', 'es2020.bigint', 'es2020.date', 'es2020.promise', 'es2020.sharedmemory', 'es2020.string', 'es2020.symbol.wellknown', 'es2020.intl', 'es2020.number', 'es2021.promise', 'es2021.string', 'es2021.weakref', 'es2021.intl', 'es2022.array', 'es2022.error', 'es2022.intl', 'es2022.object', 'es2022.sharedmemory', 'es2022.string', 'es2022.regexp', 'es2023.array', 'es2023.collection', 'es2023.intl', 'esnext.array', 'esnext.collection', 'esnext.symbol', 'esnext.asynciterable', 'esnext.intl', 'esnext.disposable', 'esnext.bigint', 'esnext.string', 'esnext.promise', 'esnext.weakref', 'esnext.decorators', 'esnext.object', 'esnext.regexp', 'esnext.iterator', 'decorators', 'decorators.legacy'.
 
diff --git a/tests/baselines/reference/config/convertCompilerOptionsFromJson/Convert trailing-whitespace string option of libs to compiler-options with jsonSourceFile api.js b/tests/baselines/reference/config/convertCompilerOptionsFromJson/Convert trailing-whitespace string option of libs to compiler-options with jsonSourceFile api.js
index 0878868862dc7..8c18f04855e76 100644
--- a/tests/baselines/reference/config/convertCompilerOptionsFromJson/Convert trailing-whitespace string option of libs to compiler-options with jsonSourceFile api.js	
+++ b/tests/baselines/reference/config/convertCompilerOptionsFromJson/Convert trailing-whitespace string option of libs to compiler-options with jsonSourceFile api.js	
@@ -30,7 +30,7 @@ CompilerOptions::
   "configFilePath": "/apath/tsconfig.json"
 }
 Errors::
-tsconfig.json:8:7 - error TS6046: Argument for '--lib' option must be: 'es5', 'es6', 'es2015', 'es7', 'es2016', 'es2017', 'es2018', 'es2019', 'es2020', 'es2021', 'es2022', 'es2023', 'esnext', 'dom', 'dom.iterable', 'dom.asynciterable', 'webworker', 'webworker.importscripts', 'webworker.iterable', 'webworker.asynciterable', 'scripthost', 'es2015.core', 'es2015.collection', 'es2015.generator', 'es2015.iterable', 'es2015.promise', 'es2015.proxy', 'es2015.reflect', 'es2015.symbol', 'es2015.symbol.wellknown', 'es2016.array.include', 'es2016.intl', 'es2017.date', 'es2017.object', 'es2017.sharedmemory', 'es2017.string', 'es2017.intl', 'es2017.typedarrays', 'es2018.asyncgenerator', 'es2018.asynciterable', 'es2018.intl', 'es2018.promise', 'es2018.regexp', 'es2019.array', 'es2019.object', 'es2019.string', 'es2019.symbol', 'es2019.intl', 'es2020.bigint', 'es2020.date', 'es2020.promise', 'es2020.sharedmemory', 'es2020.string', 'es2020.symbol.wellknown', 'es2020.intl', 'es2020.number', 'es2021.promise', 'es2021.string', 'es2021.weakref', 'es2021.intl', 'es2022.array', 'es2022.error', 'es2022.intl', 'es2022.object', 'es2022.sharedmemory', 'es2022.string', 'es2022.regexp', 'es2023.array', 'es2023.collection', 'es2023.intl', 'esnext.array', 'esnext.collection', 'esnext.symbol', 'esnext.asynciterable', 'esnext.intl', 'esnext.disposable', 'esnext.bigint', 'esnext.string', 'esnext.promise', 'esnext.weakref', 'esnext.decorators', 'esnext.object', 'esnext.regexp', 'decorators', 'decorators.legacy'.
+tsconfig.json:8:7 - error TS6046: Argument for '--lib' option must be: 'es5', 'es6', 'es2015', 'es7', 'es2016', 'es2017', 'es2018', 'es2019', 'es2020', 'es2021', 'es2022', 'es2023', 'esnext', 'dom', 'dom.iterable', 'dom.asynciterable', 'webworker', 'webworker.importscripts', 'webworker.iterable', 'webworker.asynciterable', 'scripthost', 'es2015.core', 'es2015.collection', 'es2015.generator', 'es2015.iterable', 'es2015.promise', 'es2015.proxy', 'es2015.reflect', 'es2015.symbol', 'es2015.symbol.wellknown', 'es2016.array.include', 'es2016.intl', 'es2017.date', 'es2017.object', 'es2017.sharedmemory', 'es2017.string', 'es2017.intl', 'es2017.typedarrays', 'es2018.asyncgenerator', 'es2018.asynciterable', 'es2018.intl', 'es2018.promise', 'es2018.regexp', 'es2019.array', 'es2019.object', 'es2019.string', 'es2019.symbol', 'es2019.intl', 'es2020.bigint', 'es2020.date', 'es2020.promise', 'es2020.sharedmemory', 'es2020.string', 'es2020.symbol.wellknown', 'es2020.intl', 'es2020.number', 'es2021.promise', 'es2021.string', 'es2021.weakref', 'es2021.intl', 'es2022.array', 'es2022.error', 'es2022.intl', 'es2022.object', 'es2022.sharedmemory', 'es2022.string', 'es2022.regexp', 'es2023.array', 'es2023.collection', 'es2023.intl', 'esnext.array', 'esnext.collection', 'esnext.symbol', 'esnext.asynciterable', 'esnext.intl', 'esnext.disposable', 'esnext.bigint', 'esnext.string', 'esnext.promise', 'esnext.weakref', 'esnext.decorators', 'esnext.object', 'esnext.regexp', 'esnext.iterator', 'decorators', 'decorators.legacy'.
 
 8       "   "
         ~~~~~
diff --git a/tests/baselines/reference/dependentDestructuredVariables.symbols b/tests/baselines/reference/dependentDestructuredVariables.symbols
index ae71b255d1a88..f3d5beb7b983b 100644
--- a/tests/baselines/reference/dependentDestructuredVariables.symbols
+++ b/tests/baselines/reference/dependentDestructuredVariables.symbols
@@ -477,7 +477,7 @@ const reducerBroken = (state: number, { type, payload }: Action3) => {
 
 declare var it: Iterator<number>;
 >it : Symbol(it, Decl(dependentDestructuredVariables.ts, 183, 11))
->Iterator : Symbol(Iterator, Decl(lib.es2015.iterable.d.ts, --, --))
+>Iterator : Symbol(Iterator, Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.esnext.iterator.d.ts, --, --))
 
 const { value, done } = it.next();
 >value : Symbol(value, Decl(dependentDestructuredVariables.ts, 184, 7))
diff --git a/tests/baselines/reference/dependentDestructuredVariables.types b/tests/baselines/reference/dependentDestructuredVariables.types
index 23830ab53191b..a657a02c6b621 100644
--- a/tests/baselines/reference/dependentDestructuredVariables.types
+++ b/tests/baselines/reference/dependentDestructuredVariables.types
@@ -2,7 +2,7 @@
 
 === Performance Stats ===
 Type Count: 2,500
-Instantiation count: 2,500
+Instantiation count: 5,000
 
 === dependentDestructuredVariables.ts ===
 type Action =
diff --git a/tests/baselines/reference/esNextWeakRefs_IterableWeakMap.types b/tests/baselines/reference/esNextWeakRefs_IterableWeakMap.types
index fed54292dcda0..d435d3822e424 100644
--- a/tests/baselines/reference/esNextWeakRefs_IterableWeakMap.types
+++ b/tests/baselines/reference/esNextWeakRefs_IterableWeakMap.types
@@ -1,5 +1,9 @@
 //// [tests/cases/compiler/esNextWeakRefs_IterableWeakMap.ts] ////
 
+=== Performance Stats ===
+Type Count: 1,000
+Instantiation count: 1,000
+
 === esNextWeakRefs_IterableWeakMap.ts ===
 /** `static #cleanup` */
 const IterableWeakMap_cleanup = ({ ref, set }: {
diff --git a/tests/baselines/reference/flatArrayNoExcessiveStackDepth.types b/tests/baselines/reference/flatArrayNoExcessiveStackDepth.types
index ba3de24d9b59d..7f17509e1fb2a 100644
--- a/tests/baselines/reference/flatArrayNoExcessiveStackDepth.types
+++ b/tests/baselines/reference/flatArrayNoExcessiveStackDepth.types
@@ -2,7 +2,7 @@
 
 === Performance Stats ===
 Type Count: 1,000
-Instantiation count: 2,500
+Instantiation count: 5,000
 
 === flatArrayNoExcessiveStackDepth.ts ===
 // Repro from #43493
diff --git a/tests/baselines/reference/generatorReturnContextualType.symbols b/tests/baselines/reference/generatorReturnContextualType.symbols
index 276b6fd013a71..ebaa5c3f235ef 100644
--- a/tests/baselines/reference/generatorReturnContextualType.symbols
+++ b/tests/baselines/reference/generatorReturnContextualType.symbols
@@ -14,7 +14,7 @@ function* f1(): Generator<any, { x: 'x' }, any> {
 
 function* g1(): Iterator<any, { x: 'x' }, any> {
 >g1 : Symbol(g1, Decl(generatorReturnContextualType.ts, 4, 1))
->Iterator : Symbol(Iterator, Decl(lib.es2015.iterable.d.ts, --, --))
+>Iterator : Symbol(Iterator, Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.esnext.iterator.d.ts, --, --))
 >x : Symbol(x, Decl(generatorReturnContextualType.ts, 6, 31))
 
   return { x: 'x' };
diff --git a/tests/baselines/reference/generatorReturnExpressionIsChecked.symbols b/tests/baselines/reference/generatorReturnExpressionIsChecked.symbols
index 6366a75725618..976b4c3114ded 100644
--- a/tests/baselines/reference/generatorReturnExpressionIsChecked.symbols
+++ b/tests/baselines/reference/generatorReturnExpressionIsChecked.symbols
@@ -3,7 +3,7 @@
 === generatorReturnExpressionIsChecked.ts ===
 function* f(): Iterator<number> {
 >f : Symbol(f, Decl(generatorReturnExpressionIsChecked.ts, 0, 0))
->Iterator : Symbol(Iterator, Decl(lib.es2015.iterable.d.ts, --, --))
+>Iterator : Symbol(Iterator, Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.esnext.iterator.d.ts, --, --))
 
     return invalid;
 }
diff --git a/tests/baselines/reference/generatorReturnTypeIndirectReferenceToGlobalType.symbols b/tests/baselines/reference/generatorReturnTypeIndirectReferenceToGlobalType.symbols
index 555b7048d4104..a4fae06f89977 100644
--- a/tests/baselines/reference/generatorReturnTypeIndirectReferenceToGlobalType.symbols
+++ b/tests/baselines/reference/generatorReturnTypeIndirectReferenceToGlobalType.symbols
@@ -3,7 +3,7 @@
 === generatorReturnTypeIndirectReferenceToGlobalType.ts ===
 interface I1 extends Iterator<0, 1, 2> {}
 >I1 : Symbol(I1, Decl(generatorReturnTypeIndirectReferenceToGlobalType.ts, 0, 0))
->Iterator : Symbol(Iterator, Decl(lib.es2015.iterable.d.ts, --, --))
+>Iterator : Symbol(Iterator, Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.esnext.iterator.d.ts, --, --))
 
 function* f1(): I1 {
 >f1 : Symbol(f1, Decl(generatorReturnTypeIndirectReferenceToGlobalType.ts, 0, 41))
diff --git a/tests/baselines/reference/generatorYieldContextualType.types b/tests/baselines/reference/generatorYieldContextualType.types
index 1619affc92ccb..b5e76fc358b6a 100644
--- a/tests/baselines/reference/generatorYieldContextualType.types
+++ b/tests/baselines/reference/generatorYieldContextualType.types
@@ -1,5 +1,9 @@
 //// [tests/cases/conformance/generators/generatorYieldContextualType.ts] ////
 
+=== Performance Stats ===
+Type Count: 1,000
+Instantiation count: 2,500
+
 === generatorYieldContextualType.ts ===
 declare function f1<T, R, S>(gen: () => Generator<R, T, S>): void;
 >f1 : <T, R, S>(gen: () => Generator<R, T, S>) => void
diff --git a/tests/baselines/reference/libCompileChecks.types b/tests/baselines/reference/libCompileChecks.types
index d2715dfaf6840..6015f4c511769 100644
--- a/tests/baselines/reference/libCompileChecks.types
+++ b/tests/baselines/reference/libCompileChecks.types
@@ -1,9 +1,9 @@
 //// [tests/cases/compiler/libCompileChecks.ts] ////
 
 === Performance Stats ===
-Assignability cache: 2,500
+Assignability cache: 5,000
 Type Count: 10,000
-Instantiation count: 2,500
+Instantiation count: 5,000
 
 === libCompileChecks.ts ===
 
diff --git a/tests/baselines/reference/mapGroupBy.types b/tests/baselines/reference/mapGroupBy.types
index fefa9a0fbcf49..0eb7af0da11ea 100644
--- a/tests/baselines/reference/mapGroupBy.types
+++ b/tests/baselines/reference/mapGroupBy.types
@@ -1,5 +1,9 @@
 //// [tests/cases/compiler/mapGroupBy.ts] ////
 
+=== Performance Stats ===
+Type Count: 1,000
+Instantiation count: 2,500
+
 === mapGroupBy.ts ===
 const basic = Map.groupBy([0, 2, 8], x => x < 5 ? 'small' : 'large');
 >basic : Map<"small" | "large", number[]>
diff --git a/tests/baselines/reference/modulePreserve2.trace.json b/tests/baselines/reference/modulePreserve2.trace.json
index 406e188dcf219..61b13a4e9d212 100644
--- a/tests/baselines/reference/modulePreserve2.trace.json
+++ b/tests/baselines/reference/modulePreserve2.trace.json
@@ -1019,6 +1019,20 @@
     "======== Module name '@typescript/lib-esnext/regexp' was not resolved. ========",
     "File '/.ts/package.json' does not exist according to earlier cached lookups.",
     "File '/package.json' does not exist according to earlier cached lookups.",
+    "======== Resolving module '@typescript/lib-esnext/iterator' from '/.src/__lib_node_modules_lookup_lib.esnext.iterator.d.ts__.ts'. ========",
+    "Explicitly specified module resolution kind: 'Node10'.",
+    "Loading module '@typescript/lib-esnext/iterator' from 'node_modules' folder, target file types: TypeScript, Declaration.",
+    "Searching all ancestor node_modules directories for preferred extensions: TypeScript, Declaration.",
+    "Directory '/.src/node_modules' does not exist, skipping all lookups in it.",
+    "Scoped package detected, looking in 'typescript__lib-esnext/iterator'",
+    "Directory '/node_modules/@types' does not exist, skipping all lookups in it.",
+    "Scoped package detected, looking in 'typescript__lib-esnext/iterator'",
+    "Loading module '@typescript/lib-esnext/iterator' from 'node_modules' folder, target file types: JavaScript.",
+    "Searching all ancestor node_modules directories for fallback extensions: JavaScript.",
+    "Directory '/.src/node_modules' does not exist, skipping all lookups in it.",
+    "======== Module name '@typescript/lib-esnext/iterator' was not resolved. ========",
+    "File '/.ts/package.json' does not exist according to earlier cached lookups.",
+    "File '/package.json' does not exist according to earlier cached lookups.",
     "======== Resolving module '@typescript/lib-dom' from '/.src/__lib_node_modules_lookup_lib.dom.d.ts__.ts'. ========",
     "Explicitly specified module resolution kind: 'Node10'.",
     "Loading module '@typescript/lib-dom' from 'node_modules' folder, target file types: TypeScript, Declaration.",
diff --git a/tests/baselines/reference/modulePreserve3.trace.json b/tests/baselines/reference/modulePreserve3.trace.json
index 26a3f3176c907..3bfbc02675d4c 100644
--- a/tests/baselines/reference/modulePreserve3.trace.json
+++ b/tests/baselines/reference/modulePreserve3.trace.json
@@ -951,6 +951,19 @@
     "======== Module name '@typescript/lib-esnext/regexp' was not resolved. ========",
     "File '/.ts/package.json' does not exist according to earlier cached lookups.",
     "File '/package.json' does not exist according to earlier cached lookups.",
+    "======== Resolving module '@typescript/lib-esnext/iterator' from '/.src/__lib_node_modules_lookup_lib.esnext.iterator.d.ts__.ts'. ========",
+    "Explicitly specified module resolution kind: 'Node10'.",
+    "Loading module '@typescript/lib-esnext/iterator' from 'node_modules' folder, target file types: TypeScript, Declaration.",
+    "Searching all ancestor node_modules directories for preferred extensions: TypeScript, Declaration.",
+    "Directory '/.src/node_modules' does not exist, skipping all lookups in it.",
+    "Scoped package detected, looking in 'typescript__lib-esnext/iterator'",
+    "Scoped package detected, looking in 'typescript__lib-esnext/iterator'",
+    "Loading module '@typescript/lib-esnext/iterator' from 'node_modules' folder, target file types: JavaScript.",
+    "Searching all ancestor node_modules directories for fallback extensions: JavaScript.",
+    "Directory '/.src/node_modules' does not exist, skipping all lookups in it.",
+    "======== Module name '@typescript/lib-esnext/iterator' was not resolved. ========",
+    "File '/.ts/package.json' does not exist according to earlier cached lookups.",
+    "File '/package.json' does not exist according to earlier cached lookups.",
     "======== Resolving module '@typescript/lib-dom' from '/.src/__lib_node_modules_lookup_lib.dom.d.ts__.ts'. ========",
     "Explicitly specified module resolution kind: 'Node10'.",
     "Loading module '@typescript/lib-dom' from 'node_modules' folder, target file types: TypeScript, Declaration.",
diff --git a/tests/baselines/reference/narrowingPastLastAssignment.types b/tests/baselines/reference/narrowingPastLastAssignment.types
index b1b799ee8a81c..8b6ec55ac0e62 100644
--- a/tests/baselines/reference/narrowingPastLastAssignment.types
+++ b/tests/baselines/reference/narrowingPastLastAssignment.types
@@ -1,5 +1,9 @@
 //// [tests/cases/compiler/narrowingPastLastAssignment.ts] ////
 
+=== Performance Stats ===
+Type Count: 1,000
+Instantiation count: 1,000
+
 === narrowingPastLastAssignment.ts ===
 function action(f: Function) {}
 >action : (f: Function) => void
diff --git a/tests/baselines/reference/nodeModulesExportsBlocksTypesVersions(module=nodenext).trace.json b/tests/baselines/reference/nodeModulesExportsBlocksTypesVersions(module=nodenext).trace.json
index 6bd7d40222f9b..6ce9644bf9c65 100644
--- a/tests/baselines/reference/nodeModulesExportsBlocksTypesVersions(module=nodenext).trace.json
+++ b/tests/baselines/reference/nodeModulesExportsBlocksTypesVersions(module=nodenext).trace.json
@@ -1189,6 +1189,20 @@
     "======== Module name '@typescript/lib-esnext/regexp' was not resolved. ========",
     "File '/.ts/package.json' does not exist according to earlier cached lookups.",
     "File '/package.json' does not exist according to earlier cached lookups.",
+    "======== Resolving module '@typescript/lib-esnext/iterator' from '/.src/__lib_node_modules_lookup_lib.esnext.iterator.d.ts__.ts'. ========",
+    "Explicitly specified module resolution kind: 'Node10'.",
+    "Loading module '@typescript/lib-esnext/iterator' from 'node_modules' folder, target file types: TypeScript, Declaration.",
+    "Searching all ancestor node_modules directories for preferred extensions: TypeScript, Declaration.",
+    "Directory '/.src/node_modules' does not exist, skipping all lookups in it.",
+    "Scoped package detected, looking in 'typescript__lib-esnext/iterator'",
+    "Directory '/node_modules/@types' does not exist, skipping all lookups in it.",
+    "Scoped package detected, looking in 'typescript__lib-esnext/iterator'",
+    "Loading module '@typescript/lib-esnext/iterator' from 'node_modules' folder, target file types: JavaScript.",
+    "Searching all ancestor node_modules directories for fallback extensions: JavaScript.",
+    "Directory '/.src/node_modules' does not exist, skipping all lookups in it.",
+    "======== Module name '@typescript/lib-esnext/iterator' was not resolved. ========",
+    "File '/.ts/package.json' does not exist according to earlier cached lookups.",
+    "File '/package.json' does not exist according to earlier cached lookups.",
     "======== Resolving module '@typescript/lib-dom' from '/.src/__lib_node_modules_lookup_lib.dom.d.ts__.ts'. ========",
     "Explicitly specified module resolution kind: 'Node10'.",
     "Loading module '@typescript/lib-dom' from 'node_modules' folder, target file types: TypeScript, Declaration.",
diff --git a/tests/baselines/reference/nodeModulesPackageImports(module=nodenext).trace.json b/tests/baselines/reference/nodeModulesPackageImports(module=nodenext).trace.json
index 0faf9ac8e2d24..84552c9fbe071 100644
--- a/tests/baselines/reference/nodeModulesPackageImports(module=nodenext).trace.json
+++ b/tests/baselines/reference/nodeModulesPackageImports(module=nodenext).trace.json
@@ -1133,6 +1133,21 @@
     "======== Module name '@typescript/lib-esnext/regexp' was not resolved. ========",
     "File '/.ts/package.json' does not exist according to earlier cached lookups.",
     "File '/package.json' does not exist according to earlier cached lookups.",
+    "======== Resolving module '@typescript/lib-esnext/iterator' from '/.src/__lib_node_modules_lookup_lib.esnext.iterator.d.ts__.ts'. ========",
+    "Explicitly specified module resolution kind: 'Node10'.",
+    "Loading module '@typescript/lib-esnext/iterator' from 'node_modules' folder, target file types: TypeScript, Declaration.",
+    "Searching all ancestor node_modules directories for preferred extensions: TypeScript, Declaration.",
+    "Directory '/.src/node_modules' does not exist, skipping all lookups in it.",
+    "Scoped package detected, looking in 'typescript__lib-esnext/iterator'",
+    "Directory '/node_modules' does not exist, skipping all lookups in it.",
+    "Scoped package detected, looking in 'typescript__lib-esnext/iterator'",
+    "Loading module '@typescript/lib-esnext/iterator' from 'node_modules' folder, target file types: JavaScript.",
+    "Searching all ancestor node_modules directories for fallback extensions: JavaScript.",
+    "Directory '/.src/node_modules' does not exist, skipping all lookups in it.",
+    "Directory '/node_modules' does not exist, skipping all lookups in it.",
+    "======== Module name '@typescript/lib-esnext/iterator' was not resolved. ========",
+    "File '/.ts/package.json' does not exist according to earlier cached lookups.",
+    "File '/package.json' does not exist according to earlier cached lookups.",
     "======== Resolving module '@typescript/lib-dom' from '/.src/__lib_node_modules_lookup_lib.dom.d.ts__.ts'. ========",
     "Explicitly specified module resolution kind: 'Node10'.",
     "Loading module '@typescript/lib-dom' from 'node_modules' folder, target file types: TypeScript, Declaration.",
diff --git a/tests/baselines/reference/nodeModulesPackagePatternExportsTrailers(module=nodenext).trace.json b/tests/baselines/reference/nodeModulesPackagePatternExportsTrailers(module=nodenext).trace.json
index 0ef4d5da75fb7..1d857712fbca0 100644
--- a/tests/baselines/reference/nodeModulesPackagePatternExportsTrailers(module=nodenext).trace.json
+++ b/tests/baselines/reference/nodeModulesPackagePatternExportsTrailers(module=nodenext).trace.json
@@ -1170,6 +1170,20 @@
     "======== Module name '@typescript/lib-esnext/regexp' was not resolved. ========",
     "File '/.ts/package.json' does not exist according to earlier cached lookups.",
     "File '/package.json' does not exist according to earlier cached lookups.",
+    "======== Resolving module '@typescript/lib-esnext/iterator' from '/.src/__lib_node_modules_lookup_lib.esnext.iterator.d.ts__.ts'. ========",
+    "Explicitly specified module resolution kind: 'Node10'.",
+    "Loading module '@typescript/lib-esnext/iterator' from 'node_modules' folder, target file types: TypeScript, Declaration.",
+    "Searching all ancestor node_modules directories for preferred extensions: TypeScript, Declaration.",
+    "Directory '/.src/node_modules/@types' does not exist, skipping all lookups in it.",
+    "Scoped package detected, looking in 'typescript__lib-esnext/iterator'",
+    "Directory '/node_modules' does not exist, skipping all lookups in it.",
+    "Scoped package detected, looking in 'typescript__lib-esnext/iterator'",
+    "Loading module '@typescript/lib-esnext/iterator' from 'node_modules' folder, target file types: JavaScript.",
+    "Searching all ancestor node_modules directories for fallback extensions: JavaScript.",
+    "Directory '/node_modules' does not exist, skipping all lookups in it.",
+    "======== Module name '@typescript/lib-esnext/iterator' was not resolved. ========",
+    "File '/.ts/package.json' does not exist according to earlier cached lookups.",
+    "File '/package.json' does not exist according to earlier cached lookups.",
     "======== Resolving module '@typescript/lib-dom' from '/.src/__lib_node_modules_lookup_lib.dom.d.ts__.ts'. ========",
     "Explicitly specified module resolution kind: 'Node10'.",
     "Loading module '@typescript/lib-dom' from 'node_modules' folder, target file types: TypeScript, Declaration.",
diff --git a/tests/baselines/reference/objectGroupBy.types b/tests/baselines/reference/objectGroupBy.types
index b89e032a26da6..803e8f9ba2a81 100644
--- a/tests/baselines/reference/objectGroupBy.types
+++ b/tests/baselines/reference/objectGroupBy.types
@@ -1,5 +1,9 @@
 //// [tests/cases/compiler/objectGroupBy.ts] ////
 
+=== Performance Stats ===
+Type Count: 1,000
+Instantiation count: 2,500
+
 === objectGroupBy.ts ===
 const basic = Object.groupBy([0, 2, 8], x => x < 5 ? 'small' : 'large');
 >basic : Partial<Record<"small" | "large", number[]>>
diff --git a/tests/baselines/reference/parenthesizedJSDocCastAtReturnStatement.types b/tests/baselines/reference/parenthesizedJSDocCastAtReturnStatement.types
index 929dec815dc71..495bb963c3846 100644
--- a/tests/baselines/reference/parenthesizedJSDocCastAtReturnStatement.types
+++ b/tests/baselines/reference/parenthesizedJSDocCastAtReturnStatement.types
@@ -1,5 +1,9 @@
 //// [tests/cases/compiler/parenthesizedJSDocCastAtReturnStatement.ts] ////
 
+=== Performance Stats ===
+Type Count: 1,000
+Instantiation count: 1,000
+
 === index.js ===
 /** @type {Map<string, string | Set<string>>} */
 const cache = new Map()
diff --git a/tests/baselines/reference/reactJsxReactResolvedNodeNext.trace.json b/tests/baselines/reference/reactJsxReactResolvedNodeNext.trace.json
index d19286646e834..793a061fb3bbd 100644
--- a/tests/baselines/reference/reactJsxReactResolvedNodeNext.trace.json
+++ b/tests/baselines/reference/reactJsxReactResolvedNodeNext.trace.json
@@ -964,6 +964,19 @@
     "======== Module name '@typescript/lib-esnext/regexp' was not resolved. ========",
     "File '/.ts/package.json' does not exist according to earlier cached lookups.",
     "File '/package.json' does not exist according to earlier cached lookups.",
+    "======== Resolving module '@typescript/lib-esnext/iterator' from '/.src/__lib_node_modules_lookup_lib.esnext.iterator.d.ts__.ts'. ========",
+    "Explicitly specified module resolution kind: 'Node10'.",
+    "Loading module '@typescript/lib-esnext/iterator' from 'node_modules' folder, target file types: TypeScript, Declaration.",
+    "Searching all ancestor node_modules directories for preferred extensions: TypeScript, Declaration.",
+    "Scoped package detected, looking in 'typescript__lib-esnext/iterator'",
+    "Directory '/node_modules' does not exist, skipping all lookups in it.",
+    "Scoped package detected, looking in 'typescript__lib-esnext/iterator'",
+    "Loading module '@typescript/lib-esnext/iterator' from 'node_modules' folder, target file types: JavaScript.",
+    "Searching all ancestor node_modules directories for fallback extensions: JavaScript.",
+    "Directory '/node_modules' does not exist, skipping all lookups in it.",
+    "======== Module name '@typescript/lib-esnext/iterator' was not resolved. ========",
+    "File '/.ts/package.json' does not exist according to earlier cached lookups.",
+    "File '/package.json' does not exist according to earlier cached lookups.",
     "======== Resolving module '@typescript/lib-dom' from '/.src/__lib_node_modules_lookup_lib.dom.d.ts__.ts'. ========",
     "Explicitly specified module resolution kind: 'Node10'.",
     "Loading module '@typescript/lib-dom' from 'node_modules' folder, target file types: TypeScript, Declaration.",
diff --git a/tests/baselines/reference/reactJsxReactResolvedNodeNextEsm.trace.json b/tests/baselines/reference/reactJsxReactResolvedNodeNextEsm.trace.json
index 1849087a77565..fd26708d87106 100644
--- a/tests/baselines/reference/reactJsxReactResolvedNodeNextEsm.trace.json
+++ b/tests/baselines/reference/reactJsxReactResolvedNodeNextEsm.trace.json
@@ -964,6 +964,19 @@
     "======== Module name '@typescript/lib-esnext/regexp' was not resolved. ========",
     "File '/.ts/package.json' does not exist according to earlier cached lookups.",
     "File '/package.json' does not exist according to earlier cached lookups.",
+    "======== Resolving module '@typescript/lib-esnext/iterator' from '/.src/__lib_node_modules_lookup_lib.esnext.iterator.d.ts__.ts'. ========",
+    "Explicitly specified module resolution kind: 'Node10'.",
+    "Loading module '@typescript/lib-esnext/iterator' from 'node_modules' folder, target file types: TypeScript, Declaration.",
+    "Searching all ancestor node_modules directories for preferred extensions: TypeScript, Declaration.",
+    "Scoped package detected, looking in 'typescript__lib-esnext/iterator'",
+    "Directory '/node_modules' does not exist, skipping all lookups in it.",
+    "Scoped package detected, looking in 'typescript__lib-esnext/iterator'",
+    "Loading module '@typescript/lib-esnext/iterator' from 'node_modules' folder, target file types: JavaScript.",
+    "Searching all ancestor node_modules directories for fallback extensions: JavaScript.",
+    "Directory '/node_modules' does not exist, skipping all lookups in it.",
+    "======== Module name '@typescript/lib-esnext/iterator' was not resolved. ========",
+    "File '/.ts/package.json' does not exist according to earlier cached lookups.",
+    "File '/package.json' does not exist according to earlier cached lookups.",
     "======== Resolving module '@typescript/lib-dom' from '/.src/__lib_node_modules_lookup_lib.dom.d.ts__.ts'. ========",
     "Explicitly specified module resolution kind: 'Node10'.",
     "Loading module '@typescript/lib-dom' from 'node_modules' folder, target file types: TypeScript, Declaration.",
diff --git a/tests/baselines/reference/substitutionTypePassedToExtends.types b/tests/baselines/reference/substitutionTypePassedToExtends.types
index c8aee67f83cec..6303a70854df0 100644
--- a/tests/baselines/reference/substitutionTypePassedToExtends.types
+++ b/tests/baselines/reference/substitutionTypePassedToExtends.types
@@ -1,5 +1,9 @@
 //// [tests/cases/compiler/substitutionTypePassedToExtends.ts] ////
 
+=== Performance Stats ===
+Type Count: 250 -> 1,000
+Instantiation count: 100 -> 1,000
+
 === substitutionTypePassedToExtends.ts ===
 type Foo1<A,B> = [A, B] extends unknown[][] ? Bar1<[A, B]> : 'else'
 >Foo1 : Foo1<A, B>
diff --git a/tests/baselines/reference/tsc/runWithoutArgs/does-not-add-color-when-NO_COLOR-is-set.js b/tests/baselines/reference/tsc/runWithoutArgs/does-not-add-color-when-NO_COLOR-is-set.js
index 97c9057dd03b3..8201ec9ce247e 100644
--- a/tests/baselines/reference/tsc/runWithoutArgs/does-not-add-color-when-NO_COLOR-is-set.js
+++ b/tests/baselines/reference/tsc/runWithoutArgs/does-not-add-color-when-NO_COLOR-is-set.js
@@ -111,7 +111,7 @@ default: undefined
 
 --lib
 Specify a set of bundled library declaration files that describe the target runtime environment.
-one or more: es5, es6/es2015, es7/es2016, es2017, es2018, es2019, es2020, es2021, es2022, es2023, esnext, dom, dom.iterable, dom.asynciterable, webworker, webworker.importscripts, webworker.iterable, webworker.asynciterable, scripthost, es2015.core, es2015.collection, es2015.generator, es2015.iterable, es2015.promise, es2015.proxy, es2015.reflect, es2015.symbol, es2015.symbol.wellknown, es2016.array.include, es2016.intl, es2017.date, es2017.object, es2017.sharedmemory, es2017.string, es2017.intl, es2017.typedarrays, es2018.asyncgenerator, es2018.asynciterable/esnext.asynciterable, es2018.intl, es2018.promise, es2018.regexp, es2019.array, es2019.object, es2019.string, es2019.symbol/esnext.symbol, es2019.intl, es2020.bigint/esnext.bigint, es2020.date, es2020.promise, es2020.sharedmemory, es2020.string, es2020.symbol.wellknown, es2020.intl, es2020.number, es2021.promise, es2021.string, es2021.weakref/esnext.weakref, es2021.intl, es2022.array, es2022.error, es2022.intl, es2022.object, es2022.sharedmemory, es2022.string/esnext.string, es2022.regexp, es2023.array, es2023.collection, es2023.intl, esnext.array, esnext.collection, esnext.intl, esnext.disposable, esnext.promise, esnext.decorators, esnext.object, esnext.regexp, decorators, decorators.legacy
+one or more: es5, es6/es2015, es7/es2016, es2017, es2018, es2019, es2020, es2021, es2022, es2023, esnext, dom, dom.iterable, dom.asynciterable, webworker, webworker.importscripts, webworker.iterable, webworker.asynciterable, scripthost, es2015.core, es2015.collection, es2015.generator, es2015.iterable, es2015.promise, es2015.proxy, es2015.reflect, es2015.symbol, es2015.symbol.wellknown, es2016.array.include, es2016.intl, es2017.date, es2017.object, es2017.sharedmemory, es2017.string, es2017.intl, es2017.typedarrays, es2018.asyncgenerator, es2018.asynciterable/esnext.asynciterable, es2018.intl, es2018.promise, es2018.regexp, es2019.array, es2019.object, es2019.string, es2019.symbol/esnext.symbol, es2019.intl, es2020.bigint/esnext.bigint, es2020.date, es2020.promise, es2020.sharedmemory, es2020.string, es2020.symbol.wellknown, es2020.intl, es2020.number, es2021.promise, es2021.string, es2021.weakref/esnext.weakref, es2021.intl, es2022.array, es2022.error, es2022.intl, es2022.object, es2022.sharedmemory, es2022.string/esnext.string, es2022.regexp, es2023.array, es2023.collection, es2023.intl, esnext.array, esnext.collection, esnext.intl, esnext.disposable, esnext.promise, esnext.decorators, esnext.object, esnext.regexp, esnext.iterator, decorators, decorators.legacy
 default: undefined
 
 --allowJs
diff --git a/tests/baselines/reference/tsc/runWithoutArgs/show-help-with-ExitStatus.DiagnosticsPresent_OutputsSkipped-when-host-can't-provide-terminal-width.js b/tests/baselines/reference/tsc/runWithoutArgs/show-help-with-ExitStatus.DiagnosticsPresent_OutputsSkipped-when-host-can't-provide-terminal-width.js
index 8191f56bbf51a..5da7c419d54b2 100644
--- a/tests/baselines/reference/tsc/runWithoutArgs/show-help-with-ExitStatus.DiagnosticsPresent_OutputsSkipped-when-host-can't-provide-terminal-width.js
+++ b/tests/baselines/reference/tsc/runWithoutArgs/show-help-with-ExitStatus.DiagnosticsPresent_OutputsSkipped-when-host-can't-provide-terminal-width.js
@@ -111,7 +111,7 @@ default: undefined
 
 --lib
 Specify a set of bundled library declaration files that describe the target runtime environment.
-one or more: es5, es6/es2015, es7/es2016, es2017, es2018, es2019, es2020, es2021, es2022, es2023, esnext, dom, dom.iterable, dom.asynciterable, webworker, webworker.importscripts, webworker.iterable, webworker.asynciterable, scripthost, es2015.core, es2015.collection, es2015.generator, es2015.iterable, es2015.promise, es2015.proxy, es2015.reflect, es2015.symbol, es2015.symbol.wellknown, es2016.array.include, es2016.intl, es2017.date, es2017.object, es2017.sharedmemory, es2017.string, es2017.intl, es2017.typedarrays, es2018.asyncgenerator, es2018.asynciterable/esnext.asynciterable, es2018.intl, es2018.promise, es2018.regexp, es2019.array, es2019.object, es2019.string, es2019.symbol/esnext.symbol, es2019.intl, es2020.bigint/esnext.bigint, es2020.date, es2020.promise, es2020.sharedmemory, es2020.string, es2020.symbol.wellknown, es2020.intl, es2020.number, es2021.promise, es2021.string, es2021.weakref/esnext.weakref, es2021.intl, es2022.array, es2022.error, es2022.intl, es2022.object, es2022.sharedmemory, es2022.string/esnext.string, es2022.regexp, es2023.array, es2023.collection, es2023.intl, esnext.array, esnext.collection, esnext.intl, esnext.disposable, esnext.promise, esnext.decorators, esnext.object, esnext.regexp, decorators, decorators.legacy
+one or more: es5, es6/es2015, es7/es2016, es2017, es2018, es2019, es2020, es2021, es2022, es2023, esnext, dom, dom.iterable, dom.asynciterable, webworker, webworker.importscripts, webworker.iterable, webworker.asynciterable, scripthost, es2015.core, es2015.collection, es2015.generator, es2015.iterable, es2015.promise, es2015.proxy, es2015.reflect, es2015.symbol, es2015.symbol.wellknown, es2016.array.include, es2016.intl, es2017.date, es2017.object, es2017.sharedmemory, es2017.string, es2017.intl, es2017.typedarrays, es2018.asyncgenerator, es2018.asynciterable/esnext.asynciterable, es2018.intl, es2018.promise, es2018.regexp, es2019.array, es2019.object, es2019.string, es2019.symbol/esnext.symbol, es2019.intl, es2020.bigint/esnext.bigint, es2020.date, es2020.promise, es2020.sharedmemory, es2020.string, es2020.symbol.wellknown, es2020.intl, es2020.number, es2021.promise, es2021.string, es2021.weakref/esnext.weakref, es2021.intl, es2022.array, es2022.error, es2022.intl, es2022.object, es2022.sharedmemory, es2022.string/esnext.string, es2022.regexp, es2023.array, es2023.collection, es2023.intl, esnext.array, esnext.collection, esnext.intl, esnext.disposable, esnext.promise, esnext.decorators, esnext.object, esnext.regexp, esnext.iterator, decorators, decorators.legacy
 default: undefined
 
 --allowJs
diff --git a/tests/baselines/reference/tsc/runWithoutArgs/show-help-with-ExitStatus.DiagnosticsPresent_OutputsSkipped.js b/tests/baselines/reference/tsc/runWithoutArgs/show-help-with-ExitStatus.DiagnosticsPresent_OutputsSkipped.js
index 8191f56bbf51a..5da7c419d54b2 100644
--- a/tests/baselines/reference/tsc/runWithoutArgs/show-help-with-ExitStatus.DiagnosticsPresent_OutputsSkipped.js
+++ b/tests/baselines/reference/tsc/runWithoutArgs/show-help-with-ExitStatus.DiagnosticsPresent_OutputsSkipped.js
@@ -111,7 +111,7 @@ default: undefined
 
 --lib
 Specify a set of bundled library declaration files that describe the target runtime environment.
-one or more: es5, es6/es2015, es7/es2016, es2017, es2018, es2019, es2020, es2021, es2022, es2023, esnext, dom, dom.iterable, dom.asynciterable, webworker, webworker.importscripts, webworker.iterable, webworker.asynciterable, scripthost, es2015.core, es2015.collection, es2015.generator, es2015.iterable, es2015.promise, es2015.proxy, es2015.reflect, es2015.symbol, es2015.symbol.wellknown, es2016.array.include, es2016.intl, es2017.date, es2017.object, es2017.sharedmemory, es2017.string, es2017.intl, es2017.typedarrays, es2018.asyncgenerator, es2018.asynciterable/esnext.asynciterable, es2018.intl, es2018.promise, es2018.regexp, es2019.array, es2019.object, es2019.string, es2019.symbol/esnext.symbol, es2019.intl, es2020.bigint/esnext.bigint, es2020.date, es2020.promise, es2020.sharedmemory, es2020.string, es2020.symbol.wellknown, es2020.intl, es2020.number, es2021.promise, es2021.string, es2021.weakref/esnext.weakref, es2021.intl, es2022.array, es2022.error, es2022.intl, es2022.object, es2022.sharedmemory, es2022.string/esnext.string, es2022.regexp, es2023.array, es2023.collection, es2023.intl, esnext.array, esnext.collection, esnext.intl, esnext.disposable, esnext.promise, esnext.decorators, esnext.object, esnext.regexp, decorators, decorators.legacy
+one or more: es5, es6/es2015, es7/es2016, es2017, es2018, es2019, es2020, es2021, es2022, es2023, esnext, dom, dom.iterable, dom.asynciterable, webworker, webworker.importscripts, webworker.iterable, webworker.asynciterable, scripthost, es2015.core, es2015.collection, es2015.generator, es2015.iterable, es2015.promise, es2015.proxy, es2015.reflect, es2015.symbol, es2015.symbol.wellknown, es2016.array.include, es2016.intl, es2017.date, es2017.object, es2017.sharedmemory, es2017.string, es2017.intl, es2017.typedarrays, es2018.asyncgenerator, es2018.asynciterable/esnext.asynciterable, es2018.intl, es2018.promise, es2018.regexp, es2019.array, es2019.object, es2019.string, es2019.symbol/esnext.symbol, es2019.intl, es2020.bigint/esnext.bigint, es2020.date, es2020.promise, es2020.sharedmemory, es2020.string, es2020.symbol.wellknown, es2020.intl, es2020.number, es2021.promise, es2021.string, es2021.weakref/esnext.weakref, es2021.intl, es2022.array, es2022.error, es2022.intl, es2022.object, es2022.sharedmemory, es2022.string/esnext.string, es2022.regexp, es2023.array, es2023.collection, es2023.intl, esnext.array, esnext.collection, esnext.intl, esnext.disposable, esnext.promise, esnext.decorators, esnext.object, esnext.regexp, esnext.iterator, decorators, decorators.legacy
 default: undefined
 
 --allowJs
diff --git a/tests/baselines/reference/tsserver/telemetry/does-not-expose-paths.js b/tests/baselines/reference/tsserver/telemetry/does-not-expose-paths.js
index 19c33189826f8..6ff4987c1957c 100644
--- a/tests/baselines/reference/tsserver/telemetry/does-not-expose-paths.js
+++ b/tests/baselines/reference/tsserver/telemetry/does-not-expose-paths.js
@@ -443,7 +443,7 @@ Info seq  [hh:mm:ss:mss] event:
               "line": 34,
               "offset": 16
             },
-            "text": "Argument for '--lib' option must be: 'es5', 'es6', 'es2015', 'es7', 'es2016', 'es2017', 'es2018', 'es2019', 'es2020', 'es2021', 'es2022', 'es2023', 'esnext', 'dom', 'dom.iterable', 'dom.asynciterable', 'webworker', 'webworker.importscripts', 'webworker.iterable', 'webworker.asynciterable', 'scripthost', 'es2015.core', 'es2015.collection', 'es2015.generator', 'es2015.iterable', 'es2015.promise', 'es2015.proxy', 'es2015.reflect', 'es2015.symbol', 'es2015.symbol.wellknown', 'es2016.array.include', 'es2016.intl', 'es2017.date', 'es2017.object', 'es2017.sharedmemory', 'es2017.string', 'es2017.intl', 'es2017.typedarrays', 'es2018.asyncgenerator', 'es2018.asynciterable', 'es2018.intl', 'es2018.promise', 'es2018.regexp', 'es2019.array', 'es2019.object', 'es2019.string', 'es2019.symbol', 'es2019.intl', 'es2020.bigint', 'es2020.date', 'es2020.promise', 'es2020.sharedmemory', 'es2020.string', 'es2020.symbol.wellknown', 'es2020.intl', 'es2020.number', 'es2021.promise', 'es2021.string', 'es2021.weakref', 'es2021.intl', 'es2022.array', 'es2022.error', 'es2022.intl', 'es2022.object', 'es2022.sharedmemory', 'es2022.string', 'es2022.regexp', 'es2023.array', 'es2023.collection', 'es2023.intl', 'esnext.array', 'esnext.collection', 'esnext.symbol', 'esnext.asynciterable', 'esnext.intl', 'esnext.disposable', 'esnext.bigint', 'esnext.string', 'esnext.promise', 'esnext.weakref', 'esnext.decorators', 'esnext.object', 'esnext.regexp', 'decorators', 'decorators.legacy'.",
+            "text": "Argument for '--lib' option must be: 'es5', 'es6', 'es2015', 'es7', 'es2016', 'es2017', 'es2018', 'es2019', 'es2020', 'es2021', 'es2022', 'es2023', 'esnext', 'dom', 'dom.iterable', 'dom.asynciterable', 'webworker', 'webworker.importscripts', 'webworker.iterable', 'webworker.asynciterable', 'scripthost', 'es2015.core', 'es2015.collection', 'es2015.generator', 'es2015.iterable', 'es2015.promise', 'es2015.proxy', 'es2015.reflect', 'es2015.symbol', 'es2015.symbol.wellknown', 'es2016.array.include', 'es2016.intl', 'es2017.date', 'es2017.object', 'es2017.sharedmemory', 'es2017.string', 'es2017.intl', 'es2017.typedarrays', 'es2018.asyncgenerator', 'es2018.asynciterable', 'es2018.intl', 'es2018.promise', 'es2018.regexp', 'es2019.array', 'es2019.object', 'es2019.string', 'es2019.symbol', 'es2019.intl', 'es2020.bigint', 'es2020.date', 'es2020.promise', 'es2020.sharedmemory', 'es2020.string', 'es2020.symbol.wellknown', 'es2020.intl', 'es2020.number', 'es2021.promise', 'es2021.string', 'es2021.weakref', 'es2021.intl', 'es2022.array', 'es2022.error', 'es2022.intl', 'es2022.object', 'es2022.sharedmemory', 'es2022.string', 'es2022.regexp', 'es2023.array', 'es2023.collection', 'es2023.intl', 'esnext.array', 'esnext.collection', 'esnext.symbol', 'esnext.asynciterable', 'esnext.intl', 'esnext.disposable', 'esnext.bigint', 'esnext.string', 'esnext.promise', 'esnext.weakref', 'esnext.decorators', 'esnext.object', 'esnext.regexp', 'esnext.iterator', 'decorators', 'decorators.legacy'.",
             "code": 6046,
             "category": "error",
             "fileName": "/tsconfig.json"
diff --git a/tests/baselines/reference/types.asyncGenerators.es2018.2.symbols b/tests/baselines/reference/types.asyncGenerators.es2018.2.symbols
index 5fc37ff0791b9..ec2eea8b3b443 100644
--- a/tests/baselines/reference/types.asyncGenerators.es2018.2.symbols
+++ b/tests/baselines/reference/types.asyncGenerators.es2018.2.symbols
@@ -142,7 +142,7 @@ async function * explicitReturnType11(): Iterable<number> {
 }
 async function * explicitReturnType12(): Iterator<number> {
 >explicitReturnType12 : Symbol(explicitReturnType12, Decl(types.asyncGenerators.es2018.2.ts, 68, 1))
->Iterator : Symbol(Iterator, Decl(lib.es2015.iterable.d.ts, --, --))
+>Iterator : Symbol(Iterator, Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.esnext.iterator.d.ts, --, --))
 
     yield 1;
 }
diff --git a/tests/baselines/reference/typesVersions.ambientModules.trace.json b/tests/baselines/reference/typesVersions.ambientModules.trace.json
index d1db5bcce72c1..f1bf85fcff11b 100644
--- a/tests/baselines/reference/typesVersions.ambientModules.trace.json
+++ b/tests/baselines/reference/typesVersions.ambientModules.trace.json
@@ -1058,6 +1058,20 @@
     "======== Module name '@typescript/lib-esnext/regexp' was not resolved. ========",
     "File '/.ts/package.json' does not exist according to earlier cached lookups.",
     "File '/package.json' does not exist according to earlier cached lookups.",
+    "======== Resolving module '@typescript/lib-esnext/iterator' from '/.src/__lib_node_modules_lookup_lib.esnext.iterator.d.ts__.ts'. ========",
+    "Explicitly specified module resolution kind: 'Node10'.",
+    "Loading module '@typescript/lib-esnext/iterator' from 'node_modules' folder, target file types: TypeScript, Declaration.",
+    "Searching all ancestor node_modules directories for preferred extensions: TypeScript, Declaration.",
+    "Directory '/.src/node_modules/@types' does not exist, skipping all lookups in it.",
+    "Scoped package detected, looking in 'typescript__lib-esnext/iterator'",
+    "Directory '/node_modules' does not exist, skipping all lookups in it.",
+    "Scoped package detected, looking in 'typescript__lib-esnext/iterator'",
+    "Loading module '@typescript/lib-esnext/iterator' from 'node_modules' folder, target file types: JavaScript.",
+    "Searching all ancestor node_modules directories for fallback extensions: JavaScript.",
+    "Directory '/node_modules' does not exist, skipping all lookups in it.",
+    "======== Module name '@typescript/lib-esnext/iterator' was not resolved. ========",
+    "File '/.ts/package.json' does not exist according to earlier cached lookups.",
+    "File '/package.json' does not exist according to earlier cached lookups.",
     "======== Resolving module '@typescript/lib-dom' from '/.src/__lib_node_modules_lookup_lib.dom.d.ts__.ts'. ========",
     "Explicitly specified module resolution kind: 'Node10'.",
     "Loading module '@typescript/lib-dom' from 'node_modules' folder, target file types: TypeScript, Declaration.",
diff --git a/tests/baselines/reference/typesVersions.emptyTypes.trace.json b/tests/baselines/reference/typesVersions.emptyTypes.trace.json
index 329da7de27ea8..0112ce90ea1be 100644
--- a/tests/baselines/reference/typesVersions.emptyTypes.trace.json
+++ b/tests/baselines/reference/typesVersions.emptyTypes.trace.json
@@ -1076,6 +1076,21 @@
     "======== Module name '@typescript/lib-esnext/regexp' was not resolved. ========",
     "File '/.ts/package.json' does not exist according to earlier cached lookups.",
     "File '/package.json' does not exist according to earlier cached lookups.",
+    "======== Resolving module '@typescript/lib-esnext/iterator' from '/.src/__lib_node_modules_lookup_lib.esnext.iterator.d.ts__.ts'. ========",
+    "Explicitly specified module resolution kind: 'Node10'.",
+    "Loading module '@typescript/lib-esnext/iterator' from 'node_modules' folder, target file types: TypeScript, Declaration.",
+    "Searching all ancestor node_modules directories for preferred extensions: TypeScript, Declaration.",
+    "Directory '/.src/node_modules' does not exist, skipping all lookups in it.",
+    "Scoped package detected, looking in 'typescript__lib-esnext/iterator'",
+    "Directory '/node_modules' does not exist, skipping all lookups in it.",
+    "Scoped package detected, looking in 'typescript__lib-esnext/iterator'",
+    "Loading module '@typescript/lib-esnext/iterator' from 'node_modules' folder, target file types: JavaScript.",
+    "Searching all ancestor node_modules directories for fallback extensions: JavaScript.",
+    "Directory '/.src/node_modules' does not exist, skipping all lookups in it.",
+    "Directory '/node_modules' does not exist, skipping all lookups in it.",
+    "======== Module name '@typescript/lib-esnext/iterator' was not resolved. ========",
+    "File '/.ts/package.json' does not exist according to earlier cached lookups.",
+    "File '/package.json' does not exist according to earlier cached lookups.",
     "======== Resolving module '@typescript/lib-dom' from '/.src/__lib_node_modules_lookup_lib.dom.d.ts__.ts'. ========",
     "Explicitly specified module resolution kind: 'Node10'.",
     "Loading module '@typescript/lib-dom' from 'node_modules' folder, target file types: TypeScript, Declaration.",
diff --git a/tests/baselines/reference/typesVersions.justIndex.trace.json b/tests/baselines/reference/typesVersions.justIndex.trace.json
index 107cb19c7d5c9..5d94e0a04d8fa 100644
--- a/tests/baselines/reference/typesVersions.justIndex.trace.json
+++ b/tests/baselines/reference/typesVersions.justIndex.trace.json
@@ -1076,6 +1076,21 @@
     "======== Module name '@typescript/lib-esnext/regexp' was not resolved. ========",
     "File '/.ts/package.json' does not exist according to earlier cached lookups.",
     "File '/package.json' does not exist according to earlier cached lookups.",
+    "======== Resolving module '@typescript/lib-esnext/iterator' from '/.src/__lib_node_modules_lookup_lib.esnext.iterator.d.ts__.ts'. ========",
+    "Explicitly specified module resolution kind: 'Node10'.",
+    "Loading module '@typescript/lib-esnext/iterator' from 'node_modules' folder, target file types: TypeScript, Declaration.",
+    "Searching all ancestor node_modules directories for preferred extensions: TypeScript, Declaration.",
+    "Directory '/.src/node_modules' does not exist, skipping all lookups in it.",
+    "Scoped package detected, looking in 'typescript__lib-esnext/iterator'",
+    "Directory '/node_modules' does not exist, skipping all lookups in it.",
+    "Scoped package detected, looking in 'typescript__lib-esnext/iterator'",
+    "Loading module '@typescript/lib-esnext/iterator' from 'node_modules' folder, target file types: JavaScript.",
+    "Searching all ancestor node_modules directories for fallback extensions: JavaScript.",
+    "Directory '/.src/node_modules' does not exist, skipping all lookups in it.",
+    "Directory '/node_modules' does not exist, skipping all lookups in it.",
+    "======== Module name '@typescript/lib-esnext/iterator' was not resolved. ========",
+    "File '/.ts/package.json' does not exist according to earlier cached lookups.",
+    "File '/package.json' does not exist according to earlier cached lookups.",
     "======== Resolving module '@typescript/lib-dom' from '/.src/__lib_node_modules_lookup_lib.dom.d.ts__.ts'. ========",
     "Explicitly specified module resolution kind: 'Node10'.",
     "Loading module '@typescript/lib-dom' from 'node_modules' folder, target file types: TypeScript, Declaration.",
diff --git a/tests/baselines/reference/typesVersions.multiFile.trace.json b/tests/baselines/reference/typesVersions.multiFile.trace.json
index 42f5b7cbf0fc3..20bc9012a3f4e 100644
--- a/tests/baselines/reference/typesVersions.multiFile.trace.json
+++ b/tests/baselines/reference/typesVersions.multiFile.trace.json
@@ -1021,6 +1021,20 @@
     "======== Module name '@typescript/lib-esnext/regexp' was not resolved. ========",
     "File '/.ts/package.json' does not exist according to earlier cached lookups.",
     "File '/package.json' does not exist according to earlier cached lookups.",
+    "======== Resolving module '@typescript/lib-esnext/iterator' from '/.src/__lib_node_modules_lookup_lib.esnext.iterator.d.ts__.ts'. ========",
+    "Explicitly specified module resolution kind: 'Node10'.",
+    "Loading module '@typescript/lib-esnext/iterator' from 'node_modules' folder, target file types: TypeScript, Declaration.",
+    "Searching all ancestor node_modules directories for preferred extensions: TypeScript, Declaration.",
+    "Directory '/.src/node_modules/@types' does not exist, skipping all lookups in it.",
+    "Scoped package detected, looking in 'typescript__lib-esnext/iterator'",
+    "Directory '/node_modules' does not exist, skipping all lookups in it.",
+    "Scoped package detected, looking in 'typescript__lib-esnext/iterator'",
+    "Loading module '@typescript/lib-esnext/iterator' from 'node_modules' folder, target file types: JavaScript.",
+    "Searching all ancestor node_modules directories for fallback extensions: JavaScript.",
+    "Directory '/node_modules' does not exist, skipping all lookups in it.",
+    "======== Module name '@typescript/lib-esnext/iterator' was not resolved. ========",
+    "File '/.ts/package.json' does not exist according to earlier cached lookups.",
+    "File '/package.json' does not exist according to earlier cached lookups.",
     "======== Resolving module '@typescript/lib-dom' from '/.src/__lib_node_modules_lookup_lib.dom.d.ts__.ts'. ========",
     "Explicitly specified module resolution kind: 'Node10'.",
     "Loading module '@typescript/lib-dom' from 'node_modules' folder, target file types: TypeScript, Declaration.",
diff --git a/tests/baselines/reference/typesVersionsDeclarationEmit.ambient.trace.json b/tests/baselines/reference/typesVersionsDeclarationEmit.ambient.trace.json
index d1db5bcce72c1..f1bf85fcff11b 100644
--- a/tests/baselines/reference/typesVersionsDeclarationEmit.ambient.trace.json
+++ b/tests/baselines/reference/typesVersionsDeclarationEmit.ambient.trace.json
@@ -1058,6 +1058,20 @@
     "======== Module name '@typescript/lib-esnext/regexp' was not resolved. ========",
     "File '/.ts/package.json' does not exist according to earlier cached lookups.",
     "File '/package.json' does not exist according to earlier cached lookups.",
+    "======== Resolving module '@typescript/lib-esnext/iterator' from '/.src/__lib_node_modules_lookup_lib.esnext.iterator.d.ts__.ts'. ========",
+    "Explicitly specified module resolution kind: 'Node10'.",
+    "Loading module '@typescript/lib-esnext/iterator' from 'node_modules' folder, target file types: TypeScript, Declaration.",
+    "Searching all ancestor node_modules directories for preferred extensions: TypeScript, Declaration.",
+    "Directory '/.src/node_modules/@types' does not exist, skipping all lookups in it.",
+    "Scoped package detected, looking in 'typescript__lib-esnext/iterator'",
+    "Directory '/node_modules' does not exist, skipping all lookups in it.",
+    "Scoped package detected, looking in 'typescript__lib-esnext/iterator'",
+    "Loading module '@typescript/lib-esnext/iterator' from 'node_modules' folder, target file types: JavaScript.",
+    "Searching all ancestor node_modules directories for fallback extensions: JavaScript.",
+    "Directory '/node_modules' does not exist, skipping all lookups in it.",
+    "======== Module name '@typescript/lib-esnext/iterator' was not resolved. ========",
+    "File '/.ts/package.json' does not exist according to earlier cached lookups.",
+    "File '/package.json' does not exist according to earlier cached lookups.",
     "======== Resolving module '@typescript/lib-dom' from '/.src/__lib_node_modules_lookup_lib.dom.d.ts__.ts'. ========",
     "Explicitly specified module resolution kind: 'Node10'.",
     "Loading module '@typescript/lib-dom' from 'node_modules' folder, target file types: TypeScript, Declaration.",
diff --git a/tests/baselines/reference/typesVersionsDeclarationEmit.multiFile.trace.json b/tests/baselines/reference/typesVersionsDeclarationEmit.multiFile.trace.json
index 42f5b7cbf0fc3..20bc9012a3f4e 100644
--- a/tests/baselines/reference/typesVersionsDeclarationEmit.multiFile.trace.json
+++ b/tests/baselines/reference/typesVersionsDeclarationEmit.multiFile.trace.json
@@ -1021,6 +1021,20 @@
     "======== Module name '@typescript/lib-esnext/regexp' was not resolved. ========",
     "File '/.ts/package.json' does not exist according to earlier cached lookups.",
     "File '/package.json' does not exist according to earlier cached lookups.",
+    "======== Resolving module '@typescript/lib-esnext/iterator' from '/.src/__lib_node_modules_lookup_lib.esnext.iterator.d.ts__.ts'. ========",
+    "Explicitly specified module resolution kind: 'Node10'.",
+    "Loading module '@typescript/lib-esnext/iterator' from 'node_modules' folder, target file types: TypeScript, Declaration.",
+    "Searching all ancestor node_modules directories for preferred extensions: TypeScript, Declaration.",
+    "Directory '/.src/node_modules/@types' does not exist, skipping all lookups in it.",
+    "Scoped package detected, looking in 'typescript__lib-esnext/iterator'",
+    "Directory '/node_modules' does not exist, skipping all lookups in it.",
+    "Scoped package detected, looking in 'typescript__lib-esnext/iterator'",
+    "Loading module '@typescript/lib-esnext/iterator' from 'node_modules' folder, target file types: JavaScript.",
+    "Searching all ancestor node_modules directories for fallback extensions: JavaScript.",
+    "Directory '/node_modules' does not exist, skipping all lookups in it.",
+    "======== Module name '@typescript/lib-esnext/iterator' was not resolved. ========",
+    "File '/.ts/package.json' does not exist according to earlier cached lookups.",
+    "File '/package.json' does not exist according to earlier cached lookups.",
     "======== Resolving module '@typescript/lib-dom' from '/.src/__lib_node_modules_lookup_lib.dom.d.ts__.ts'. ========",
     "Explicitly specified module resolution kind: 'Node10'.",
     "Loading module '@typescript/lib-dom' from 'node_modules' folder, target file types: TypeScript, Declaration.",
diff --git a/tests/baselines/reference/typesVersionsDeclarationEmit.multiFileBackReferenceToSelf.trace.json b/tests/baselines/reference/typesVersionsDeclarationEmit.multiFileBackReferenceToSelf.trace.json
index 774007ccd8a66..8e21e27a4469f 100644
--- a/tests/baselines/reference/typesVersionsDeclarationEmit.multiFileBackReferenceToSelf.trace.json
+++ b/tests/baselines/reference/typesVersionsDeclarationEmit.multiFileBackReferenceToSelf.trace.json
@@ -1044,6 +1044,20 @@
     "======== Module name '@typescript/lib-esnext/regexp' was not resolved. ========",
     "File '/.ts/package.json' does not exist according to earlier cached lookups.",
     "File '/package.json' does not exist according to earlier cached lookups.",
+    "======== Resolving module '@typescript/lib-esnext/iterator' from '/.src/__lib_node_modules_lookup_lib.esnext.iterator.d.ts__.ts'. ========",
+    "Explicitly specified module resolution kind: 'Node10'.",
+    "Loading module '@typescript/lib-esnext/iterator' from 'node_modules' folder, target file types: TypeScript, Declaration.",
+    "Searching all ancestor node_modules directories for preferred extensions: TypeScript, Declaration.",
+    "Directory '/.src/node_modules/@types' does not exist, skipping all lookups in it.",
+    "Scoped package detected, looking in 'typescript__lib-esnext/iterator'",
+    "Directory '/node_modules' does not exist, skipping all lookups in it.",
+    "Scoped package detected, looking in 'typescript__lib-esnext/iterator'",
+    "Loading module '@typescript/lib-esnext/iterator' from 'node_modules' folder, target file types: JavaScript.",
+    "Searching all ancestor node_modules directories for fallback extensions: JavaScript.",
+    "Directory '/node_modules' does not exist, skipping all lookups in it.",
+    "======== Module name '@typescript/lib-esnext/iterator' was not resolved. ========",
+    "File '/.ts/package.json' does not exist according to earlier cached lookups.",
+    "File '/package.json' does not exist according to earlier cached lookups.",
     "======== Resolving module '@typescript/lib-dom' from '/.src/__lib_node_modules_lookup_lib.dom.d.ts__.ts'. ========",
     "Explicitly specified module resolution kind: 'Node10'.",
     "Loading module '@typescript/lib-dom' from 'node_modules' folder, target file types: TypeScript, Declaration.",
diff --git a/tests/baselines/reference/typesVersionsDeclarationEmit.multiFileBackReferenceToUnmapped.trace.json b/tests/baselines/reference/typesVersionsDeclarationEmit.multiFileBackReferenceToUnmapped.trace.json
index 74258268ae864..a6f48a6af4e0a 100644
--- a/tests/baselines/reference/typesVersionsDeclarationEmit.multiFileBackReferenceToUnmapped.trace.json
+++ b/tests/baselines/reference/typesVersionsDeclarationEmit.multiFileBackReferenceToUnmapped.trace.json
@@ -1026,6 +1026,20 @@
     "======== Module name '@typescript/lib-esnext/regexp' was not resolved. ========",
     "File '/.ts/package.json' does not exist according to earlier cached lookups.",
     "File '/package.json' does not exist according to earlier cached lookups.",
+    "======== Resolving module '@typescript/lib-esnext/iterator' from '/.src/__lib_node_modules_lookup_lib.esnext.iterator.d.ts__.ts'. ========",
+    "Explicitly specified module resolution kind: 'Node10'.",
+    "Loading module '@typescript/lib-esnext/iterator' from 'node_modules' folder, target file types: TypeScript, Declaration.",
+    "Searching all ancestor node_modules directories for preferred extensions: TypeScript, Declaration.",
+    "Directory '/.src/node_modules/@types' does not exist, skipping all lookups in it.",
+    "Scoped package detected, looking in 'typescript__lib-esnext/iterator'",
+    "Directory '/node_modules' does not exist, skipping all lookups in it.",
+    "Scoped package detected, looking in 'typescript__lib-esnext/iterator'",
+    "Loading module '@typescript/lib-esnext/iterator' from 'node_modules' folder, target file types: JavaScript.",
+    "Searching all ancestor node_modules directories for fallback extensions: JavaScript.",
+    "Directory '/node_modules' does not exist, skipping all lookups in it.",
+    "======== Module name '@typescript/lib-esnext/iterator' was not resolved. ========",
+    "File '/.ts/package.json' does not exist according to earlier cached lookups.",
+    "File '/package.json' does not exist according to earlier cached lookups.",
     "======== Resolving module '@typescript/lib-dom' from '/.src/__lib_node_modules_lookup_lib.dom.d.ts__.ts'. ========",
     "Explicitly specified module resolution kind: 'Node10'.",
     "Loading module '@typescript/lib-dom' from 'node_modules' folder, target file types: TypeScript, Declaration.",
diff --git a/tests/baselines/reference/unionAndIntersectionInference3.symbols b/tests/baselines/reference/unionAndIntersectionInference3.symbols
index e84536ec7cc72..41531386e789d 100644
--- a/tests/baselines/reference/unionAndIntersectionInference3.symbols
+++ b/tests/baselines/reference/unionAndIntersectionInference3.symbols
@@ -29,7 +29,7 @@ const g: <U, R, S>(com: () => Iterator<S, U, R> | AsyncIterator<S, U, R>) => Pro
 >R : Symbol(R, Decl(unionAndIntersectionInference3.ts, 8, 12))
 >S : Symbol(S, Decl(unionAndIntersectionInference3.ts, 8, 15))
 >com : Symbol(com, Decl(unionAndIntersectionInference3.ts, 8, 19))
->Iterator : Symbol(Iterator, Decl(lib.es2015.iterable.d.ts, --, --))
+>Iterator : Symbol(Iterator, Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.esnext.iterator.d.ts, --, --))
 >S : Symbol(S, Decl(unionAndIntersectionInference3.ts, 8, 15))
 >U : Symbol(U, Decl(unionAndIntersectionInference3.ts, 8, 10))
 >R : Symbol(R, Decl(unionAndIntersectionInference3.ts, 8, 12))
@@ -43,7 +43,7 @@ const g: <U, R, S>(com: () => Iterator<S, U, R> | AsyncIterator<S, U, R>) => Pro
 >R : Symbol(R, Decl(unionAndIntersectionInference3.ts, 8, 99))
 >S : Symbol(S, Decl(unionAndIntersectionInference3.ts, 8, 102))
 >com : Symbol(com, Decl(unionAndIntersectionInference3.ts, 8, 106))
->Iterator : Symbol(Iterator, Decl(lib.es2015.iterable.d.ts, --, --))
+>Iterator : Symbol(Iterator, Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.esnext.iterator.d.ts, --, --))
 >S : Symbol(S, Decl(unionAndIntersectionInference3.ts, 8, 102))
 >U : Symbol(U, Decl(unionAndIntersectionInference3.ts, 8, 97))
 >R : Symbol(R, Decl(unionAndIntersectionInference3.ts, 8, 99))