Correctly delegate .return() in async generator

packages/babel-helpers/src/helpers.js

@@ -136,7 +136,7 @@ helpers.AsyncGenerator = helper("7.0.0-beta.0")`
         Promise.resolve(wrappedAwait ? value.wrapped : value).then(
           function (arg) {
             if (wrappedAwait) {
-              resume("next", arg);
+              resume(key === "return" ? "return" : "next", arg);
               return
             }
 
@@ -238,6 +238,10 @@ helpers.asyncGeneratorDelegate = helper("7.0.0-beta.0")`
 
     if (typeof inner.return === "function") {
       iter.return = function (value) {
+        if (waiting) {
+          waiting = false;
+          return value;
+        }
         return pump("return", value);
       };
     }

packages/babel-plugin-proposal-async-generator-functions/test/fixtures/yield-star/issue-9905/exec.js

@@ -0,0 +1,20 @@
+const log = [];
+
+async function* func1() {
+  log.push(1);
+  yield "a";
+  log.push(2);
+}
+
+async function* func2() {
+  yield* func1();
+  log.push(3);
+}
+
+return (async () => {
+  const iterator = func2();
+  await iterator.next();
+  await iterator.return();
+
+  expect(log).toEqual([1]);
+})();

packages/babel-plugin-proposal-async-generator-functions/test/fixtures/yield-star/issue-9905/options.json

@@ -0,0 +1,3 @@
+{
+  "minNodeVersion": "8.0.0"
+}

packages/babel-plugin-proposal-async-generator-functions/test/fixtures/yield-star/options.json

@@ -0,0 +1,10 @@
+{
+  "parserOpts": {
+    "allowReturnOutsideFunction": true
+  },
+  "plugins": [
+    "external-helpers",
+    "transform-async-to-generator",
+    "proposal-async-generator-functions"
+  ]
+}

packages/babel-plugin-proposal-async-generator-functions/test/fixtures/yield-star/return-method-with-finally-multiple-parallel/exec.js

@@ -0,0 +1,34 @@
+const log = [];
+
+async function* inner() {
+  try {
+    log.push(1);
+    yield "a";
+    log.push(2);
+    yield "b";
+    log.push(3);
+  } finally {
+    log.push(4);
+    yield "c";
+    log.push(5);
+  }
+}
+
+async function* outer() {
+  log.push(6);
+  yield* inner();
+  log.push(7);
+}
+
+return (async () => {
+  const iterator = outer();
+
+  let res = await iterator.next();
+  expect(res).toEqual({ value: "a", done: false });
+  expect(log).toEqual([6, 1]);
+
+  const [res1, res2] = await Promise.all([ iterator.return("x"), iterator.return("y") ]);
+  expect(res1).toEqual({ value: "c", done: false });
+  expect(res2).toEqual({ value: "y", done: true });
+  expect(log).toEqual([6, 1, 4]);
+})();

packages/babel-plugin-proposal-async-generator-functions/test/fixtures/yield-star/return-method-with-finally-multiple-parallel/options.json

@@ -0,0 +1,3 @@
+{
+  "minNodeVersion": "8.0.0"
+}

packages/babel-plugin-proposal-async-generator-functions/test/fixtures/yield-star/return-method-with-finally-multiple-serial/exec.js

@@ -0,0 +1,37 @@
+const log = [];
+
+async function* inner() {
+  try {
+    log.push(1);
+    yield "a";
+    log.push(2);
+    yield "b";
+    log.push(3);
+  } finally {
+    log.push(4);
+    yield "c";
+    log.push(5);
+  }
+}
+
+async function* outer() {
+  log.push(6);
+  yield* inner();
+  log.push(7);
+}
+
+return (async () => {
+  const iterator = outer();
+
+  let res = await iterator.next();
+  expect(res).toEqual({ value: "a", done: false });
+  expect(log).toEqual([6, 1]);
+
+  res = await iterator.return("x");
+  expect(res).toEqual({ value: "c", done: false });
+  expect(log).toEqual([6, 1, 4]);
+
+  res = await iterator.return("y");
+  expect(res).toEqual({ value: "y", done: true });
+  expect(log).toEqual([6, 1, 4]);
+})();

packages/babel-plugin-proposal-async-generator-functions/test/fixtures/yield-star/return-method-with-finally-multiple-serial/options.json

@@ -0,0 +1,3 @@
+{
+  "minNodeVersion": "8.0.0"
+}

packages/babel-plugin-proposal-async-generator-functions/test/fixtures/yield-star/return-method-with-finally/exec.js

@@ -0,0 +1,37 @@
+const log = [];
+
+async function* inner() {
+  try {
+    log.push(1);
+    yield "a";
+    log.push(2);
+    yield "b";
+    log.push(3);
+  } finally {
+    log.push(4);
+    yield "c";
+    log.push(5);
+  }
+}
+
+async function* outer() {
+  log.push(6);
+  yield* inner();
+  log.push(7);
+}
+
+return (async () => {
+  const iterator = outer();
+
+  let res = await iterator.next();
+  expect(res).toEqual({ value: "a", done: false });
+  expect(log).toEqual([6, 1]);
+
+  res = await iterator.return();
+  expect(res).toEqual({ value: "c", done: false });
+  expect(log).toEqual([6, 1, 4]);
+
+  res = await iterator.next();
+  expect(res).toEqual({ value: undefined, done: true });
+  expect(log).toEqual([6, 1, 4, 5, 7]);
+})();

packages/babel-plugin-proposal-async-generator-functions/test/fixtures/yield-star/return-method/exec.js

@@ -0,0 +1,31 @@
+const log = [];
+
+async function* inner() {
+  log.push(1);
+  yield "a";
+  log.push(2);
+  yield "b";
+  log.push(3);
+}
+
+async function* outer() {
+  log.push(4);
+  yield* inner();
+  log.push(5);
+}
+
+return (async () => {
+  const iterator = outer();
+
+  let res = await iterator.next();
+  expect(res).toEqual({ value: "a", done: false });
+  expect(log).toEqual([4, 1]);
+
+  res = await iterator.return();
+  expect(res).toEqual({ value: undefined, done: true });
+  expect(log).toEqual([4, 1]);
+
+  res = await iterator.next();
+  expect(res).toEqual({ value: undefined, done: true });
+  expect(log).toEqual([4, 1]);
+})();

packages/babel-plugin-proposal-async-generator-functions/test/fixtures/yield-star/return-method/options.json

@@ -0,0 +1,3 @@
+{
+  "minNodeVersion": "8.0.0"
+}

packages/babel-plugin-proposal-async-generator-functions/test/fixtures/yield-star/throw-method-with-catch/exec.js

@@ -0,0 +1,37 @@
+const log = [];
+
+async function* inner() {
+  try {
+    log.push(1);
+    yield "a";
+    log.push(2);
+    yield "b";
+    log.push(3);
+  } catch (e) {
+    log.push(4);
+    yield "c";
+    log.push(5);
+  }
+}
+
+async function* outer() {
+  log.push(6);
+  yield* inner();
+  log.push(7);
+}
+
+return (async () => {
+  const iterator = outer();
+
+  let res = await iterator.next();
+  expect(res).toEqual({ value: "a", done: false });
+  expect(log).toEqual([6, 1]);
+
+  res = await iterator.throw(new Error("TEST"));
+  expect(res).toEqual({ value: "c", done: false });
+  expect(log).toEqual([6, 1, 4]);
+
+  res = await iterator.next();
+  expect(res).toEqual({ value: undefined, done: true });
+  expect(log).toEqual([6, 1, 4, 5, 7]);
+})();

packages/babel-plugin-proposal-async-generator-functions/test/fixtures/yield-star/throw-method-with-finally/exec.js

@@ -0,0 +1,37 @@
+const log = [];
+
+async function* inner() {
+  try {
+    log.push(1);
+    yield "a";
+    log.push(2);
+    yield "b";
+    log.push(3);
+  } finally {
+    log.push(4);
+    yield "c";
+    log.push(5);
+  }
+}
+
+async function* outer() {
+  log.push(6);
+  yield* inner();
+  log.push(7);
+}
+
+return (async () => {
+  const iterator = outer();
+
+  let res = await iterator.next();
+  expect(res).toEqual({ value: "a", done: false });
+  expect(log).toEqual([6, 1]);
+
+  res = await iterator.throw(new Error("TEST"));
+  expect(res).toEqual({ value: "c", done: false });
+  expect(log).toEqual([6, 1, 4]);
+
+  // "yield" in finally suspended the exception for one turn
+  await expect(iterator.next()).rejects.toThrow(/TEST/);
+  expect(log).toEqual([6, 1, 4, 5]);
+})();

packages/babel-plugin-proposal-function-sent/test/fixtures/generator-kinds/async-generator/output.js

@@ -4,7 +4,7 @@ function _awaitAsyncGenerator(value) { return new _AwaitValue(value); }
 
 function _wrapAsyncGenerator(fn) { return function () { return new _AsyncGenerator(fn.apply(this, arguments)); }; }
 
-function _AsyncGenerator(gen) { var front, back; function send(key, arg) { return new Promise(function (resolve, reject) { var request = { key: key, arg: arg, resolve: resolve, reject: reject, next: null }; if (back) { back = back.next = request; } else { front = back = request; resume(key, arg); } }); } function resume(key, arg) { try { var result = gen[key](arg); var value = result.value; var wrappedAwait = value instanceof _AwaitValue; Promise.resolve(wrappedAwait ? value.wrapped : value).then(function (arg) { if (wrappedAwait) { resume("next", arg); return; } settle(result.done ? "return" : "normal", arg); }, function (err) { resume("throw", err); }); } catch (err) { settle("throw", err); } } function settle(type, value) { switch (type) { case "return": front.resolve({ value: value, done: true }); break; case "throw": front.reject(value); break; default: front.resolve({ value: value, done: false }); break; } front = front.next; if (front) { resume(front.key, front.arg); } else { back = null; } } this._invoke = send; if (typeof gen.return !== "function") { this.return = undefined; } }
+function _AsyncGenerator(gen) { var front, back; function send(key, arg) { return new Promise(function (resolve, reject) { var request = { key: key, arg: arg, resolve: resolve, reject: reject, next: null }; if (back) { back = back.next = request; } else { front = back = request; resume(key, arg); } }); } function resume(key, arg) { try { var result = gen[key](arg); var value = result.value; var wrappedAwait = value instanceof _AwaitValue; Promise.resolve(wrappedAwait ? value.wrapped : value).then(function (arg) { if (wrappedAwait) { resume(key === "return" ? "return" : "next", arg); return; } settle(result.done ? "return" : "normal", arg); }, function (err) { resume("throw", err); }); } catch (err) { settle("throw", err); } } function settle(type, value) { switch (type) { case "return": front.resolve({ value: value, done: true }); break; case "throw": front.reject(value); break; default: front.resolve({ value: value, done: false }); break; } front = front.next; if (front) { resume(front.key, front.arg); } else { back = null; } } this._invoke = send; if (typeof gen.return !== "function") { this.return = undefined; } }
 
 if (typeof Symbol === "function" && Symbol.asyncIterator) { _AsyncGenerator.prototype[Symbol.asyncIterator] = function () { return this; }; }
 

packages/babel-preset-env/test/fixtures/corejs2/entry-shippedProposals/output.js

@@ -310,7 +310,7 @@ function _awaitAsyncGenerator(value) { return new _AwaitValue(value); }
 
 function _wrapAsyncGenerator(fn) { return function () { return new _AsyncGenerator(fn.apply(this, arguments)); }; }
 
-function _AsyncGenerator(gen) { var front, back; function send(key, arg) { return new Promise(function (resolve, reject) { var request = { key: key, arg: arg, resolve: resolve, reject: reject, next: null }; if (back) { back = back.next = request; } else { front = back = request; resume(key, arg); } }); } function resume(key, arg) { try { var result = gen[key](arg); var value = result.value; var wrappedAwait = value instanceof _AwaitValue; Promise.resolve(wrappedAwait ? value.wrapped : value).then(function (arg) { if (wrappedAwait) { resume("next", arg); return; } settle(result.done ? "return" : "normal", arg); }, function (err) { resume("throw", err); }); } catch (err) { settle("throw", err); } } function settle(type, value) { switch (type) { case "return": front.resolve({ value: value, done: true }); break; case "throw": front.reject(value); break; default: front.resolve({ value: value, done: false }); break; } front = front.next; if (front) { resume(front.key, front.arg); } else { back = null; } } this._invoke = send; if (typeof gen["return"] !== "function") { this["return"] = undefined; } }
+function _AsyncGenerator(gen) { var front, back; function send(key, arg) { return new Promise(function (resolve, reject) { var request = { key: key, arg: arg, resolve: resolve, reject: reject, next: null }; if (back) { back = back.next = request; } else { front = back = request; resume(key, arg); } }); } function resume(key, arg) { try { var result = gen[key](arg); var value = result.value; var wrappedAwait = value instanceof _AwaitValue; Promise.resolve(wrappedAwait ? value.wrapped : value).then(function (arg) { if (wrappedAwait) { resume(key === "return" ? "return" : "next", arg); return; } settle(result.done ? "return" : "normal", arg); }, function (err) { resume("throw", err); }); } catch (err) { settle("throw", err); } } function settle(type, value) { switch (type) { case "return": front.resolve({ value: value, done: true }); break; case "throw": front.reject(value); break; default: front.resolve({ value: value, done: false }); break; } front = front.next; if (front) { resume(front.key, front.arg); } else { back = null; } } this._invoke = send; if (typeof gen["return"] !== "function") { this["return"] = undefined; } }
 
 if (typeof Symbol === "function" && Symbol.asyncIterator) { _AsyncGenerator.prototype[Symbol.asyncIterator] = function () { return this; }; }
 

packages/babel-preset-env/test/fixtures/corejs2/usage-shippedProposals/output.js

@@ -42,7 +42,7 @@ function _awaitAsyncGenerator(value) { return new _AwaitValue(value); }
 
 function _wrapAsyncGenerator(fn) { return function () { return new _AsyncGenerator(fn.apply(this, arguments)); }; }
 
-function _AsyncGenerator(gen) { var front, back; function send(key, arg) { return new Promise(function (resolve, reject) { var request = { key: key, arg: arg, resolve: resolve, reject: reject, next: null }; if (back) { back = back.next = request; } else { front = back = request; resume(key, arg); } }); } function resume(key, arg) { try { var result = gen[key](arg); var value = result.value; var wrappedAwait = value instanceof _AwaitValue; Promise.resolve(wrappedAwait ? value.wrapped : value).then(function (arg) { if (wrappedAwait) { resume("next", arg); return; } settle(result.done ? "return" : "normal", arg); }, function (err) { resume("throw", err); }); } catch (err) { settle("throw", err); } } function settle(type, value) { switch (type) { case "return": front.resolve({ value: value, done: true }); break; case "throw": front.reject(value); break; default: front.resolve({ value: value, done: false }); break; } front = front.next; if (front) { resume(front.key, front.arg); } else { back = null; } } this._invoke = send; if (typeof gen["return"] !== "function") { this["return"] = undefined; } }
+function _AsyncGenerator(gen) { var front, back; function send(key, arg) { return new Promise(function (resolve, reject) { var request = { key: key, arg: arg, resolve: resolve, reject: reject, next: null }; if (back) { back = back.next = request; } else { front = back = request; resume(key, arg); } }); } function resume(key, arg) { try { var result = gen[key](arg); var value = result.value; var wrappedAwait = value instanceof _AwaitValue; Promise.resolve(wrappedAwait ? value.wrapped : value).then(function (arg) { if (wrappedAwait) { resume(key === "return" ? "return" : "next", arg); return; } settle(result.done ? "return" : "normal", arg); }, function (err) { resume("throw", err); }); } catch (err) { settle("throw", err); } } function settle(type, value) { switch (type) { case "return": front.resolve({ value: value, done: true }); break; case "throw": front.reject(value); break; default: front.resolve({ value: value, done: false }); break; } front = front.next; if (front) { resume(front.key, front.arg); } else { back = null; } } this._invoke = send; if (typeof gen["return"] !== "function") { this["return"] = undefined; } }
 
 if (typeof Symbol === "function" && Symbol.asyncIterator) { _AsyncGenerator.prototype[Symbol.asyncIterator] = function () { return this; }; }
 

packages/babel-preset-env/test/fixtures/preset-options/shippedProposals/output.js

@@ -12,7 +12,7 @@ function _awaitAsyncGenerator(value) { return new _AwaitValue(value); }
 
 function _wrapAsyncGenerator(fn) { return function () { return new _AsyncGenerator(fn.apply(this, arguments)); }; }
 
-function _AsyncGenerator(gen) { var front, back; function send(key, arg) { return new Promise(function (resolve, reject) { var request = { key: key, arg: arg, resolve: resolve, reject: reject, next: null }; if (back) { back = back.next = request; } else { front = back = request; resume(key, arg); } }); } function resume(key, arg) { try { var result = gen[key](arg); var value = result.value; var wrappedAwait = value instanceof _AwaitValue; Promise.resolve(wrappedAwait ? value.wrapped : value).then(function (arg) { if (wrappedAwait) { resume("next", arg); return; } settle(result.done ? "return" : "normal", arg); }, function (err) { resume("throw", err); }); } catch (err) { settle("throw", err); } } function settle(type, value) { switch (type) { case "return": front.resolve({ value: value, done: true }); break; case "throw": front.reject(value); break; default: front.resolve({ value: value, done: false }); break; } front = front.next; if (front) { resume(front.key, front.arg); } else { back = null; } } this._invoke = send; if (typeof gen["return"] !== "function") { this["return"] = undefined; } }
+function _AsyncGenerator(gen) { var front, back; function send(key, arg) { return new Promise(function (resolve, reject) { var request = { key: key, arg: arg, resolve: resolve, reject: reject, next: null }; if (back) { back = back.next = request; } else { front = back = request; resume(key, arg); } }); } function resume(key, arg) { try { var result = gen[key](arg); var value = result.value; var wrappedAwait = value instanceof _AwaitValue; Promise.resolve(wrappedAwait ? value.wrapped : value).then(function (arg) { if (wrappedAwait) { resume(key === "return" ? "return" : "next", arg); return; } settle(result.done ? "return" : "normal", arg); }, function (err) { resume("throw", err); }); } catch (err) { settle("throw", err); } } function settle(type, value) { switch (type) { case "return": front.resolve({ value: value, done: true }); break; case "throw": front.reject(value); break; default: front.resolve({ value: value, done: false }); break; } front = front.next; if (front) { resume(front.key, front.arg); } else { back = null; } } this._invoke = send; if (typeof gen["return"] !== "function") { this["return"] = undefined; } }
 
 if (typeof Symbol === "function" && Symbol.asyncIterator) { _AsyncGenerator.prototype[Symbol.asyncIterator] = function () { return this; }; }