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emitHelpers.ts
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emitHelpers.ts
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/* @internal */
namespace ts {
export interface EmitHelperFactory {
getUnscopedHelperName(name: string): Identifier;
// TypeScript Helpers
createDecorateHelper(decoratorExpressions: readonly Expression[], target: Expression, memberName?: Expression, descriptor?: Expression): Expression;
createMetadataHelper(metadataKey: string, metadataValue: Expression): Expression;
createParamHelper(expression: Expression, parameterOffset: number): Expression;
// ES2018 Helpers
createAssignHelper(attributesSegments: readonly Expression[]): Expression;
createAwaitHelper(expression: Expression): Expression;
createAsyncGeneratorHelper(generatorFunc: FunctionExpression, hasLexicalThis: boolean): Expression;
createAsyncDelegatorHelper(expression: Expression): Expression;
createAsyncValuesHelper(expression: Expression): Expression;
// ES2018 Destructuring Helpers
createRestHelper(value: Expression, elements: readonly BindingOrAssignmentElement[], computedTempVariables: readonly Expression[] | undefined, location: TextRange): Expression;
// ES2017 Helpers
createAwaiterHelper(hasLexicalThis: boolean, hasLexicalArguments: boolean, promiseConstructor: EntityName | Expression | undefined, body: Block): Expression;
// ES2015 Helpers
createExtendsHelper(name: Identifier): Expression;
createTemplateObjectHelper(cooked: ArrayLiteralExpression, raw: ArrayLiteralExpression): Expression;
createSpreadArrayHelper(to: Expression, from: Expression, packFrom: boolean): Expression;
// ES2015 Destructuring Helpers
createValuesHelper(expression: Expression): Expression;
createReadHelper(iteratorRecord: Expression, count: number | undefined): Expression;
// ES2015 Generator Helpers
createGeneratorHelper(body: FunctionExpression): Expression;
// ES Module Helpers
createCreateBindingHelper(module: Expression, inputName: Expression, outputName: Expression | undefined): Expression;
createImportStarHelper(expression: Expression): Expression;
createImportStarCallbackHelper(): Expression;
createImportDefaultHelper(expression: Expression): Expression;
createExportStarHelper(moduleExpression: Expression, exportsExpression?: Expression): Expression;
// Class Fields Helpers
createClassPrivateFieldGetHelper(receiver: Expression, state: Identifier, kind: PrivateIdentifierKind, f: Identifier | undefined): Expression;
createClassPrivateFieldSetHelper(receiver: Expression, state: Identifier, value: Expression, kind: PrivateIdentifierKind, f: Identifier | undefined): Expression;
createClassPrivateFieldInHelper(state: Identifier, receiver: Expression): Expression;
}
export function createEmitHelperFactory(context: TransformationContext): EmitHelperFactory {
const factory = context.factory;
const immutableTrue = memoize(() => setEmitFlags(factory.createTrue(), EmitFlags.Immutable));
const immutableFalse = memoize(() => setEmitFlags(factory.createFalse(), EmitFlags.Immutable));
return {
getUnscopedHelperName,
// TypeScript Helpers
createDecorateHelper,
createMetadataHelper,
createParamHelper,
// ES2018 Helpers
createAssignHelper,
createAwaitHelper,
createAsyncGeneratorHelper,
createAsyncDelegatorHelper,
createAsyncValuesHelper,
// ES2018 Destructuring Helpers
createRestHelper,
// ES2017 Helpers
createAwaiterHelper,
// ES2015 Helpers
createExtendsHelper,
createTemplateObjectHelper,
createSpreadArrayHelper,
// ES2015 Destructuring Helpers
createValuesHelper,
createReadHelper,
// ES2015 Generator Helpers
createGeneratorHelper,
// ES Module Helpers
createCreateBindingHelper,
createImportStarHelper,
createImportStarCallbackHelper,
createImportDefaultHelper,
createExportStarHelper,
// Class Fields Helpers
createClassPrivateFieldGetHelper,
createClassPrivateFieldSetHelper,
createClassPrivateFieldInHelper
};
/**
* Gets an identifier for the name of an *unscoped* emit helper.
*/
function getUnscopedHelperName(name: string) {
return setEmitFlags(factory.createIdentifier(name), EmitFlags.HelperName | EmitFlags.AdviseOnEmitNode);
}
// TypeScript Helpers
function createDecorateHelper(decoratorExpressions: Expression[], target: Expression, memberName?: Expression, descriptor?: Expression) {
context.requestEmitHelper(decorateHelper);
const argumentsArray: Expression[] = [];
argumentsArray.push(factory.createArrayLiteralExpression(decoratorExpressions, /*multiLine*/ true));
argumentsArray.push(target);
if (memberName) {
argumentsArray.push(memberName);
if (descriptor) {
argumentsArray.push(descriptor);
}
}
return factory.createCallExpression(
getUnscopedHelperName("__decorate"),
/*typeArguments*/ undefined,
argumentsArray
);
}
function createMetadataHelper(metadataKey: string, metadataValue: Expression) {
context.requestEmitHelper(metadataHelper);
return factory.createCallExpression(
getUnscopedHelperName("__metadata"),
/*typeArguments*/ undefined,
[
factory.createStringLiteral(metadataKey),
metadataValue
]
);
}
function createParamHelper(expression: Expression, parameterOffset: number, location?: TextRange) {
context.requestEmitHelper(paramHelper);
return setTextRange(
factory.createCallExpression(
getUnscopedHelperName("__param"),
/*typeArguments*/ undefined,
[
factory.createNumericLiteral(parameterOffset + ""),
expression
]
),
location
);
}
// ES2018 Helpers
function createAssignHelper(attributesSegments: Expression[]) {
if (getEmitScriptTarget(context.getCompilerOptions()) >= ScriptTarget.ES2015) {
return factory.createCallExpression(factory.createPropertyAccessExpression(factory.createIdentifier("Object"), "assign"),
/*typeArguments*/ undefined,
attributesSegments);
}
context.requestEmitHelper(assignHelper);
return factory.createCallExpression(
getUnscopedHelperName("__assign"),
/*typeArguments*/ undefined,
attributesSegments
);
}
function createAwaitHelper(expression: Expression) {
context.requestEmitHelper(awaitHelper);
return factory.createCallExpression(getUnscopedHelperName("__await"), /*typeArguments*/ undefined, [expression]);
}
function createAsyncGeneratorHelper(generatorFunc: FunctionExpression, hasLexicalThis: boolean) {
context.requestEmitHelper(awaitHelper);
context.requestEmitHelper(asyncGeneratorHelper);
// Mark this node as originally an async function
(generatorFunc.emitNode || (generatorFunc.emitNode = {} as EmitNode)).flags |= EmitFlags.AsyncFunctionBody | EmitFlags.ReuseTempVariableScope;
return factory.createCallExpression(
getUnscopedHelperName("__asyncGenerator"),
/*typeArguments*/ undefined,
[
hasLexicalThis ? factory.createThis() : factory.createVoidZero(),
factory.createIdentifier("arguments"),
generatorFunc
]
);
}
function createAsyncDelegatorHelper(expression: Expression) {
context.requestEmitHelper(awaitHelper);
context.requestEmitHelper(asyncDelegator);
return factory.createCallExpression(
getUnscopedHelperName("__asyncDelegator"),
/*typeArguments*/ undefined,
[expression]
);
}
function createAsyncValuesHelper(expression: Expression) {
context.requestEmitHelper(asyncValues);
return factory.createCallExpression(
getUnscopedHelperName("__asyncValues"),
/*typeArguments*/ undefined,
[expression]
);
}
// ES2018 Destructuring Helpers
/** Given value: o, propName: p, pattern: { a, b, ...p } from the original statement
* `{ a, b, ...p } = o`, create `p = __rest(o, ["a", "b"]);`
*/
function createRestHelper(value: Expression, elements: readonly BindingOrAssignmentElement[], computedTempVariables: readonly Expression[] | undefined, location: TextRange): Expression {
context.requestEmitHelper(restHelper);
const propertyNames: Expression[] = [];
let computedTempVariableOffset = 0;
for (let i = 0; i < elements.length - 1; i++) {
const propertyName = getPropertyNameOfBindingOrAssignmentElement(elements[i]);
if (propertyName) {
if (isComputedPropertyName(propertyName)) {
Debug.assertIsDefined(computedTempVariables, "Encountered computed property name but 'computedTempVariables' argument was not provided.");
const temp = computedTempVariables[computedTempVariableOffset];
computedTempVariableOffset++;
// typeof _tmp === "symbol" ? _tmp : _tmp + ""
propertyNames.push(
factory.createConditionalExpression(
factory.createTypeCheck(temp, "symbol"),
/*questionToken*/ undefined,
temp,
/*colonToken*/ undefined,
factory.createAdd(temp, factory.createStringLiteral(""))
)
);
}
else {
propertyNames.push(factory.createStringLiteralFromNode(propertyName));
}
}
}
return factory.createCallExpression(
getUnscopedHelperName("__rest"),
/*typeArguments*/ undefined,
[
value,
setTextRange(
factory.createArrayLiteralExpression(propertyNames),
location
)]
);
}
// ES2017 Helpers
function createAwaiterHelper(hasLexicalThis: boolean, hasLexicalArguments: boolean, promiseConstructor: EntityName | Expression | undefined, body: Block) {
context.requestEmitHelper(awaiterHelper);
const generatorFunc = factory.createFunctionExpression(
/*modifiers*/ undefined,
factory.createToken(SyntaxKind.AsteriskToken),
/*name*/ undefined,
/*typeParameters*/ undefined,
/*parameters*/ [],
/*type*/ undefined,
body
);
// Mark this node as originally an async function
(generatorFunc.emitNode || (generatorFunc.emitNode = {} as EmitNode)).flags |= EmitFlags.AsyncFunctionBody | EmitFlags.ReuseTempVariableScope;
return factory.createCallExpression(
getUnscopedHelperName("__awaiter"),
/*typeArguments*/ undefined,
[
hasLexicalThis ? factory.createThis() : factory.createVoidZero(),
hasLexicalArguments ? factory.createIdentifier("arguments") : factory.createVoidZero(),
promiseConstructor ? createExpressionFromEntityName(factory, promiseConstructor) : factory.createVoidZero(),
generatorFunc
]
);
}
// ES2015 Helpers
function createExtendsHelper(name: Identifier) {
context.requestEmitHelper(extendsHelper);
return factory.createCallExpression(
getUnscopedHelperName("__extends"),
/*typeArguments*/ undefined,
[name, factory.createUniqueName("_super", GeneratedIdentifierFlags.Optimistic | GeneratedIdentifierFlags.FileLevel)]
);
}
function createTemplateObjectHelper(cooked: ArrayLiteralExpression, raw: ArrayLiteralExpression) {
context.requestEmitHelper(templateObjectHelper);
return factory.createCallExpression(
getUnscopedHelperName("__makeTemplateObject"),
/*typeArguments*/ undefined,
[cooked, raw]
);
}
function createSpreadArrayHelper(to: Expression, from: Expression, packFrom: boolean) {
context.requestEmitHelper(spreadArrayHelper);
return factory.createCallExpression(
getUnscopedHelperName("__spreadArray"),
/*typeArguments*/ undefined,
[to, from, packFrom ? immutableTrue() : immutableFalse()]
);
}
// ES2015 Destructuring Helpers
function createValuesHelper(expression: Expression) {
context.requestEmitHelper(valuesHelper);
return factory.createCallExpression(
getUnscopedHelperName("__values"),
/*typeArguments*/ undefined,
[expression]
);
}
function createReadHelper(iteratorRecord: Expression, count: number | undefined) {
context.requestEmitHelper(readHelper);
return factory.createCallExpression(
getUnscopedHelperName("__read"),
/*typeArguments*/ undefined,
count !== undefined
? [iteratorRecord, factory.createNumericLiteral(count + "")]
: [iteratorRecord]
);
}
// ES2015 Generator Helpers
function createGeneratorHelper(body: FunctionExpression) {
context.requestEmitHelper(generatorHelper);
return factory.createCallExpression(
getUnscopedHelperName("__generator"),
/*typeArguments*/ undefined,
[factory.createThis(), body]);
}
// ES Module Helpers
function createCreateBindingHelper(module: Expression, inputName: Expression, outputName: Expression | undefined) {
context.requestEmitHelper(createBindingHelper);
return factory.createCallExpression(
getUnscopedHelperName("__createBinding"),
/*typeArguments*/ undefined,
[factory.createIdentifier("exports"), module, inputName, ...(outputName ? [outputName] : [])]);
}
function createImportStarHelper(expression: Expression) {
context.requestEmitHelper(importStarHelper);
return factory.createCallExpression(
getUnscopedHelperName("__importStar"),
/*typeArguments*/ undefined,
[expression]
);
}
function createImportStarCallbackHelper() {
context.requestEmitHelper(importStarHelper);
return getUnscopedHelperName("__importStar");
}
function createImportDefaultHelper(expression: Expression) {
context.requestEmitHelper(importDefaultHelper);
return factory.createCallExpression(
getUnscopedHelperName("__importDefault"),
/*typeArguments*/ undefined,
[expression]
);
}
function createExportStarHelper(moduleExpression: Expression, exportsExpression: Expression = factory.createIdentifier("exports")) {
context.requestEmitHelper(exportStarHelper);
context.requestEmitHelper(createBindingHelper);
return factory.createCallExpression(
getUnscopedHelperName("__exportStar"),
/*typeArguments*/ undefined,
[moduleExpression, exportsExpression]
);
}
// Class Fields Helpers
function createClassPrivateFieldGetHelper(receiver: Expression, state: Identifier, kind: PrivateIdentifierKind, f: Identifier | undefined) {
context.requestEmitHelper(classPrivateFieldGetHelper);
let args;
if (!f) {
args = [receiver, state, factory.createStringLiteral(kind)];
}
else {
args = [receiver, state, factory.createStringLiteral(kind), f];
}
return factory.createCallExpression(getUnscopedHelperName("__classPrivateFieldGet"), /*typeArguments*/ undefined, args);
}
function createClassPrivateFieldSetHelper(receiver: Expression, state: Identifier, value: Expression, kind: PrivateIdentifierKind, f: Identifier | undefined) {
context.requestEmitHelper(classPrivateFieldSetHelper);
let args;
if (!f) {
args = [receiver, state, value, factory.createStringLiteral(kind)];
}
else {
args = [receiver, state, value, factory.createStringLiteral(kind), f];
}
return factory.createCallExpression(getUnscopedHelperName("__classPrivateFieldSet"), /*typeArguments*/ undefined, args);
}
function createClassPrivateFieldInHelper(state: Identifier, receiver: Expression) {
context.requestEmitHelper(classPrivateFieldInHelper);
return factory.createCallExpression(getUnscopedHelperName("__classPrivateFieldIn"), /* typeArguments*/ undefined, [state, receiver]);
}
}
/* @internal */
export function compareEmitHelpers(x: EmitHelper, y: EmitHelper) {
if (x === y) return Comparison.EqualTo;
if (x.priority === y.priority) return Comparison.EqualTo;
if (x.priority === undefined) return Comparison.GreaterThan;
if (y.priority === undefined) return Comparison.LessThan;
return compareValues(x.priority, y.priority);
}
/**
* @param input Template string input strings
* @param args Names which need to be made file-level unique
*/
export function helperString(input: TemplateStringsArray, ...args: string[]) {
return (uniqueName: EmitHelperUniqueNameCallback) => {
let result = "";
for (let i = 0; i < args.length; i++) {
result += input[i];
result += uniqueName(args[i]);
}
result += input[input.length - 1];
return result;
};
}
// TypeScript Helpers
export const decorateHelper: UnscopedEmitHelper = {
name: "typescript:decorate",
importName: "__decorate",
scoped: false,
priority: 2,
text: `
var __decorate = (this && this.__decorate) || function (decorators, target, key, desc) {
var c = arguments.length, r = c < 3 ? target : desc === null ? desc = Object.getOwnPropertyDescriptor(target, key) : desc, d;
if (typeof Reflect === "object" && typeof Reflect.decorate === "function") r = Reflect.decorate(decorators, target, key, desc);
else for (var i = decorators.length - 1; i >= 0; i--) if (d = decorators[i]) r = (c < 3 ? d(r) : c > 3 ? d(target, key, r) : d(target, key)) || r;
return c > 3 && r && Object.defineProperty(target, key, r), r;
};`
};
export const metadataHelper: UnscopedEmitHelper = {
name: "typescript:metadata",
importName: "__metadata",
scoped: false,
priority: 3,
text: `
var __metadata = (this && this.__metadata) || function (k, v) {
if (typeof Reflect === "object" && typeof Reflect.metadata === "function") return Reflect.metadata(k, v);
};`
};
export const paramHelper: UnscopedEmitHelper = {
name: "typescript:param",
importName: "__param",
scoped: false,
priority: 4,
text: `
var __param = (this && this.__param) || function (paramIndex, decorator) {
return function (target, key) { decorator(target, key, paramIndex); }
};`
};
// ES2018 Helpers
export const assignHelper: UnscopedEmitHelper = {
name: "typescript:assign",
importName: "__assign",
scoped: false,
priority: 1,
text: `
var __assign = (this && this.__assign) || function () {
__assign = Object.assign || function(t) {
for (var s, i = 1, n = arguments.length; i < n; i++) {
s = arguments[i];
for (var p in s) if (Object.prototype.hasOwnProperty.call(s, p))
t[p] = s[p];
}
return t;
};
return __assign.apply(this, arguments);
};`
};
export const awaitHelper: UnscopedEmitHelper = {
name: "typescript:await",
importName: "__await",
scoped: false,
text: `
var __await = (this && this.__await) || function (v) { return this instanceof __await ? (this.v = v, this) : new __await(v); }`
};
export const asyncGeneratorHelper: UnscopedEmitHelper = {
name: "typescript:asyncGenerator",
importName: "__asyncGenerator",
scoped: false,
dependencies: [awaitHelper],
text: `
var __asyncGenerator = (this && this.__asyncGenerator) || function (thisArg, _arguments, generator) {
if (!Symbol.asyncIterator) throw new TypeError("Symbol.asyncIterator is not defined.");
var g = generator.apply(thisArg, _arguments || []), i, q = [];
return i = {}, verb("next"), verb("throw"), verb("return"), i[Symbol.asyncIterator] = function () { return this; }, i;
function verb(n) { if (g[n]) i[n] = function (v) { return new Promise(function (a, b) { q.push([n, v, a, b]) > 1 || resume(n, v); }); }; }
function resume(n, v) { try { step(g[n](v)); } catch (e) { settle(q[0][3], e); } }
function step(r) { r.value instanceof __await ? Promise.resolve(r.value.v).then(fulfill, reject) : settle(q[0][2], r); }
function fulfill(value) { resume("next", value); }
function reject(value) { resume("throw", value); }
function settle(f, v) { if (f(v), q.shift(), q.length) resume(q[0][0], q[0][1]); }
};`
};
export const asyncDelegator: UnscopedEmitHelper = {
name: "typescript:asyncDelegator",
importName: "__asyncDelegator",
scoped: false,
dependencies: [awaitHelper],
text: `
var __asyncDelegator = (this && this.__asyncDelegator) || function (o) {
var i, p;
return i = {}, verb("next"), verb("throw", function (e) { throw e; }), verb("return"), i[Symbol.iterator] = function () { return this; }, i;
function verb(n, f) { i[n] = o[n] ? function (v) { return (p = !p) ? { value: __await(o[n](v)), done: n === "return" } : f ? f(v) : v; } : f; }
};`
};
export const asyncValues: UnscopedEmitHelper = {
name: "typescript:asyncValues",
importName: "__asyncValues",
scoped: false,
text: `
var __asyncValues = (this && this.__asyncValues) || function (o) {
if (!Symbol.asyncIterator) throw new TypeError("Symbol.asyncIterator is not defined.");
var m = o[Symbol.asyncIterator], i;
return m ? m.call(o) : (o = typeof __values === "function" ? __values(o) : o[Symbol.iterator](), i = {}, verb("next"), verb("throw"), verb("return"), i[Symbol.asyncIterator] = function () { return this; }, i);
function verb(n) { i[n] = o[n] && function (v) { return new Promise(function (resolve, reject) { v = o[n](v), settle(resolve, reject, v.done, v.value); }); }; }
function settle(resolve, reject, d, v) { Promise.resolve(v).then(function(v) { resolve({ value: v, done: d }); }, reject); }
};`
};
// ES2018 Destructuring Helpers
export const restHelper: UnscopedEmitHelper = {
name: "typescript:rest",
importName: "__rest",
scoped: false,
text: `
var __rest = (this && this.__rest) || function (s, e) {
var t = {};
for (var p in s) if (Object.prototype.hasOwnProperty.call(s, p) && e.indexOf(p) < 0)
t[p] = s[p];
if (s != null && typeof Object.getOwnPropertySymbols === "function")
for (var i = 0, p = Object.getOwnPropertySymbols(s); i < p.length; i++) {
if (e.indexOf(p[i]) < 0 && Object.prototype.propertyIsEnumerable.call(s, p[i]))
t[p[i]] = s[p[i]];
}
return t;
};`
};
// ES2017 Helpers
export const awaiterHelper: UnscopedEmitHelper = {
name: "typescript:awaiter",
importName: "__awaiter",
scoped: false,
priority: 5,
text: `
var __awaiter = (this && this.__awaiter) || function (thisArg, _arguments, P, generator) {
function adopt(value) { return value instanceof P ? value : new P(function (resolve) { resolve(value); }); }
return new (P || (P = Promise))(function (resolve, reject) {
function fulfilled(value) { try { step(generator.next(value)); } catch (e) { reject(e); } }
function rejected(value) { try { step(generator["throw"](value)); } catch (e) { reject(e); } }
function step(result) { result.done ? resolve(result.value) : adopt(result.value).then(fulfilled, rejected); }
step((generator = generator.apply(thisArg, _arguments || [])).next());
});
};`
};
// ES2015 Helpers
export const extendsHelper: UnscopedEmitHelper = {
name: "typescript:extends",
importName: "__extends",
scoped: false,
priority: 0,
text: `
var __extends = (this && this.__extends) || (function () {
var extendStatics = function (d, b) {
extendStatics = Object.setPrototypeOf ||
({ __proto__: [] } instanceof Array && function (d, b) { d.__proto__ = b; }) ||
function (d, b) { for (var p in b) if (Object.prototype.hasOwnProperty.call(b, p)) d[p] = b[p]; };
return extendStatics(d, b);
};
return function (d, b) {
if (typeof b !== "function" && b !== null)
throw new TypeError("Class extends value " + String(b) + " is not a constructor or null");
extendStatics(d, b);
function __() { this.constructor = d; }
d.prototype = b === null ? Object.create(b) : (__.prototype = b.prototype, new __());
};
})();`
};
export const templateObjectHelper: UnscopedEmitHelper = {
name: "typescript:makeTemplateObject",
importName: "__makeTemplateObject",
scoped: false,
priority: 0,
text: `
var __makeTemplateObject = (this && this.__makeTemplateObject) || function (cooked, raw) {
if (Object.defineProperty) { Object.defineProperty(cooked, "raw", { value: raw }); } else { cooked.raw = raw; }
return cooked;
};`
};
export const readHelper: UnscopedEmitHelper = {
name: "typescript:read",
importName: "__read",
scoped: false,
text: `
var __read = (this && this.__read) || function (o, n) {
var m = typeof Symbol === "function" && o[Symbol.iterator];
if (!m) return o;
var i = m.call(o), r, ar = [], e;
try {
while ((n === void 0 || n-- > 0) && !(r = i.next()).done) ar.push(r.value);
}
catch (error) { e = { error: error }; }
finally {
try {
if (r && !r.done && (m = i["return"])) m.call(i);
}
finally { if (e) throw e.error; }
}
return ar;
};`
};
export const spreadArrayHelper: UnscopedEmitHelper = {
name: "typescript:spreadArray",
importName: "__spreadArray",
scoped: false,
text: `
var __spreadArray = (this && this.__spreadArray) || function (to, from, pack) {
if (pack || arguments.length === 2) for (var i = 0, l = from.length, ar; i < l; i++) {
if (ar || !(i in from)) {
if (!ar) ar = Array.prototype.slice.call(from, 0, i);
ar[i] = from[i];
}
}
return to.concat(ar || Array.prototype.slice.call(from));
};`
};
// ES2015 Destructuring Helpers
export const valuesHelper: UnscopedEmitHelper = {
name: "typescript:values",
importName: "__values",
scoped: false,
text: `
var __values = (this && this.__values) || function(o) {
var s = typeof Symbol === "function" && Symbol.iterator, m = s && o[s], i = 0;
if (m) return m.call(o);
if (o && typeof o.length === "number") return {
next: function () {
if (o && i >= o.length) o = void 0;
return { value: o && o[i++], done: !o };
}
};
throw new TypeError(s ? "Object is not iterable." : "Symbol.iterator is not defined.");
};`
};
// ES2015 Generator Helpers
// The __generator helper is used by down-level transformations to emulate the runtime
// semantics of an ES2015 generator function. When called, this helper returns an
// object that implements the Iterator protocol, in that it has `next`, `return`, and
// `throw` methods that step through the generator when invoked.
//
// parameters:
// @param thisArg The value to use as the `this` binding for the transformed generator body.
// @param body A function that acts as the transformed generator body.
//
// variables:
// _ Persistent state for the generator that is shared between the helper and the
// generator body. The state object has the following members:
// sent() - A method that returns or throws the current completion value.
// label - The next point at which to resume evaluation of the generator body.
// trys - A stack of protected regions (try/catch/finally blocks).
// ops - A stack of pending instructions when inside of a finally block.
// f A value indicating whether the generator is executing.
// y An iterator to delegate for a yield*.
// t A temporary variable that holds one of the following values (note that these
// cases do not overlap):
// - The completion value when resuming from a `yield` or `yield*`.
// - The error value for a catch block.
// - The current protected region (array of try/catch/finally/end labels).
// - The verb (`next`, `throw`, or `return` method) to delegate to the expression
// of a `yield*`.
// - The result of evaluating the verb delegated to the expression of a `yield*`.
//
// functions:
// verb(n) Creates a bound callback to the `step` function for opcode `n`.
// step(op) Evaluates opcodes in a generator body until execution is suspended or
// completed.
//
// The __generator helper understands a limited set of instructions:
// 0: next(value?) - Start or resume the generator with the specified value.
// 1: throw(error) - Resume the generator with an exception. If the generator is
// suspended inside of one or more protected regions, evaluates
// any intervening finally blocks between the current label and
// the nearest catch block or function boundary. If uncaught, the
// exception is thrown to the caller.
// 2: return(value?) - Resume the generator as if with a return. If the generator is
// suspended inside of one or more protected regions, evaluates any
// intervening finally blocks.
// 3: break(label) - Jump to the specified label. If the label is outside of the
// current protected region, evaluates any intervening finally
// blocks.
// 4: yield(value?) - Yield execution to the caller with an optional value. When
// resumed, the generator will continue at the next label.
// 5: yield*(value) - Delegates evaluation to the supplied iterator. When
// delegation completes, the generator will continue at the next
// label.
// 6: catch(error) - Handles an exception thrown from within the generator body. If
// the current label is inside of one or more protected regions,
// evaluates any intervening finally blocks between the current
// label and the nearest catch block or function boundary. If
// uncaught, the exception is thrown to the caller.
// 7: endfinally - Ends a finally block, resuming the last instruction prior to
// entering a finally block.
//
// For examples of how these are used, see the comments in ./transformers/generators.ts
export const generatorHelper: UnscopedEmitHelper = {
name: "typescript:generator",
importName: "__generator",
scoped: false,
priority: 6,
text: `
var __generator = (this && this.__generator) || function (thisArg, body) {
var _ = { label: 0, sent: function() { if (t[0] & 1) throw t[1]; return t[1]; }, trys: [], ops: [] }, f, y, t, g;
return g = { next: verb(0), "throw": verb(1), "return": verb(2) }, typeof Symbol === "function" && (g[Symbol.iterator] = function() { return this; }), g;
function verb(n) { return function (v) { return step([n, v]); }; }
function step(op) {
if (f) throw new TypeError("Generator is already executing.");
while (_) try {
if (f = 1, y && (t = op[0] & 2 ? y["return"] : op[0] ? y["throw"] || ((t = y["return"]) && t.call(y), 0) : y.next) && !(t = t.call(y, op[1])).done) return t;
if (y = 0, t) op = [op[0] & 2, t.value];
switch (op[0]) {
case 0: case 1: t = op; break;
case 4: _.label++; return { value: op[1], done: false };
case 5: _.label++; y = op[1]; op = [0]; continue;
case 7: op = _.ops.pop(); _.trys.pop(); continue;
default:
if (!(t = _.trys, t = t.length > 0 && t[t.length - 1]) && (op[0] === 6 || op[0] === 2)) { _ = 0; continue; }
if (op[0] === 3 && (!t || (op[1] > t[0] && op[1] < t[3]))) { _.label = op[1]; break; }
if (op[0] === 6 && _.label < t[1]) { _.label = t[1]; t = op; break; }
if (t && _.label < t[2]) { _.label = t[2]; _.ops.push(op); break; }
if (t[2]) _.ops.pop();
_.trys.pop(); continue;
}
op = body.call(thisArg, _);
} catch (e) { op = [6, e]; y = 0; } finally { f = t = 0; }
if (op[0] & 5) throw op[1]; return { value: op[0] ? op[1] : void 0, done: true };
}
};`
};
// ES Module Helpers
export const createBindingHelper: UnscopedEmitHelper = {
name: "typescript:commonjscreatebinding",
importName: "__createBinding",
scoped: false,
priority: 1,
text: `
var __createBinding = (this && this.__createBinding) || (Object.create ? (function(o, m, k, k2) {
if (k2 === undefined) k2 = k;
var desc = Object.getOwnPropertyDescriptor(m, k);
if (!desc || ("get" in desc ? !m.__esModule : desc.writable || desc.configurable)) {
desc = { enumerable: true, get: function() { return m[k]; } };
}
Object.defineProperty(o, k2, desc);
}) : (function(o, m, k, k2) {
if (k2 === undefined) k2 = k;
o[k2] = m[k];
}));`
};
export const setModuleDefaultHelper: UnscopedEmitHelper = {
name: "typescript:commonjscreatevalue",
importName: "__setModuleDefault",
scoped: false,
priority: 1,
text: `
var __setModuleDefault = (this && this.__setModuleDefault) || (Object.create ? (function(o, v) {
Object.defineProperty(o, "default", { enumerable: true, value: v });
}) : function(o, v) {
o["default"] = v;
});`
};
// emit helper for `import * as Name from "foo"`
export const importStarHelper: UnscopedEmitHelper = {
name: "typescript:commonjsimportstar",
importName: "__importStar",
scoped: false,
dependencies: [createBindingHelper, setModuleDefaultHelper],
priority: 2,
text: `
var __importStar = (this && this.__importStar) || function (mod) {
if (mod && mod.__esModule) return mod;
var result = {};
if (mod != null) for (var k in mod) if (k !== "default" && Object.prototype.hasOwnProperty.call(mod, k)) __createBinding(result, mod, k);
__setModuleDefault(result, mod);
return result;
};`
};
// emit helper for `import Name from "foo"`
export const importDefaultHelper: UnscopedEmitHelper = {
name: "typescript:commonjsimportdefault",
importName: "__importDefault",
scoped: false,
text: `
var __importDefault = (this && this.__importDefault) || function (mod) {
return (mod && mod.__esModule) ? mod : { "default": mod };
};`
};
export const exportStarHelper: UnscopedEmitHelper = {
name: "typescript:export-star",
importName: "__exportStar",
scoped: false,
dependencies: [createBindingHelper],
priority: 2,
text: `
var __exportStar = (this && this.__exportStar) || function(m, exports) {
for (var p in m) if (p !== "default" && !Object.prototype.hasOwnProperty.call(exports, p)) __createBinding(exports, m, p);
};`
};
/**
* Parameters:
* @param receiver — The object from which the private member will be read.
* @param state — One of the following:
* - A WeakMap used to read a private instance field.
* - A WeakSet used as an instance brand for private instance methods and accessors.
* - A function value that should be the undecorated class constructor used to brand check private static fields, methods, and accessors.
* @param kind — (optional pre TS 4.3, required for TS 4.3+) One of the following values:
* - undefined — Indicates a private instance field (pre TS 4.3).
* - "f" — Indicates a private field (instance or static).
* - "m" — Indicates a private method (instance or static).
* - "a" — Indicates a private accessor (instance or static).
* @param f — (optional pre TS 4.3) Depends on the arguments for state and kind:
* - If kind is "m", this should be the function corresponding to the static or instance method.
* - If kind is "a", this should be the function corresponding to the getter method, or undefined if the getter was not defined.
* - If kind is "f" and state is a function, this should be an object holding the value of a static field, or undefined if the static field declaration has not yet been evaluated.
* Usage:
* This helper will only ever be used by the compiler in the following ways:
*
* Reading from a private instance field (pre TS 4.3):
* __classPrivateFieldGet(<any>, <WeakMap>)
*
* Reading from a private instance field (TS 4.3+):
* __classPrivateFieldGet(<any>, <WeakMap>, "f")
*
* Reading from a private instance get accessor (when defined, TS 4.3+):
* __classPrivateFieldGet(<any>, <WeakSet>, "a", <function>)
*
* Reading from a private instance get accessor (when not defined, TS 4.3+):
* __classPrivateFieldGet(<any>, <WeakSet>, "a", void 0)
* NOTE: This always results in a runtime error.
*
* Reading from a private instance method (TS 4.3+):
* __classPrivateFieldGet(<any>, <WeakSet>, "m", <function>)
*
* Reading from a private static field (TS 4.3+):
* __classPrivateFieldGet(<any>, <constructor>, "f", <{ value: any }>)
*
* Reading from a private static get accessor (when defined, TS 4.3+):
* __classPrivateFieldGet(<any>, <constructor>, "a", <function>)
*
* Reading from a private static get accessor (when not defined, TS 4.3+):
* __classPrivateFieldGet(<any>, <constructor>, "a", void 0)
* NOTE: This always results in a runtime error.
*
* Reading from a private static method (TS 4.3+):
* __classPrivateFieldGet(<any>, <constructor>, "m", <function>)
*/
export const classPrivateFieldGetHelper: UnscopedEmitHelper = {
name: "typescript:classPrivateFieldGet",
importName: "__classPrivateFieldGet",
scoped: false,
text: `
var __classPrivateFieldGet = (this && this.__classPrivateFieldGet) || function (receiver, state, kind, f) {
if (kind === "a" && !f) throw new TypeError("Private accessor was defined without a getter");
if (typeof state === "function" ? receiver !== state || !f : !state.has(receiver)) throw new TypeError("Cannot read private member from an object whose class did not declare it");
return kind === "m" ? f : kind === "a" ? f.call(receiver) : f ? f.value : state.get(receiver);
};`
};
/**
* Parameters:
* @param receiver — The object on which the private member will be set.
* @param state — One of the following:
* - A WeakMap used to store a private instance field.
* - A WeakSet used as an instance brand for private instance methods and accessors.
* - A function value that should be the undecorated class constructor used to brand check private static fields, methods, and accessors.
* @param value — The value to set.
* @param kind — (optional pre TS 4.3, required for TS 4.3+) One of the following values:
* - undefined — Indicates a private instance field (pre TS 4.3).
* - "f" — Indicates a private field (instance or static).
* - "m" — Indicates a private method (instance or static).
* - "a" — Indicates a private accessor (instance or static).
* @param f — (optional pre TS 4.3) Depends on the arguments for state and kind:
* - If kind is "m", this should be the function corresponding to the static or instance method.
* - If kind is "a", this should be the function corresponding to the setter method, or undefined if the setter was not defined.
* - If kind is "f" and state is a function, this should be an object holding the value of a static field, or undefined if the static field declaration has not yet been evaluated.
* Usage:
* This helper will only ever be used by the compiler in the following ways:
*
* Writing to a private instance field (pre TS 4.3):
* __classPrivateFieldSet(<any>, <WeakMap>, <any>)
*
* Writing to a private instance field (TS 4.3+):
* __classPrivateFieldSet(<any>, <WeakMap>, <any>, "f")
*
* Writing to a private instance set accessor (when defined, TS 4.3+):
* __classPrivateFieldSet(<any>, <WeakSet>, <any>, "a", <function>)
*
* Writing to a private instance set accessor (when not defined, TS 4.3+):
* __classPrivateFieldSet(<any>, <WeakSet>, <any>, "a", void 0)
* NOTE: This always results in a runtime error.
*
* Writing to a private instance method (TS 4.3+):
* __classPrivateFieldSet(<any>, <WeakSet>, <any>, "m", <function>)
* NOTE: This always results in a runtime error.
*
* Writing to a private static field (TS 4.3+):
* __classPrivateFieldSet(<any>, <constructor>, <any>, "f", <{ value: any }>)
*
* Writing to a private static set accessor (when defined, TS 4.3+):
* __classPrivateFieldSet(<any>, <constructor>, <any>, "a", <function>)
*
* Writing to a private static set accessor (when not defined, TS 4.3+):
* __classPrivateFieldSet(<any>, <constructor>, <any>, "a", void 0)
* NOTE: This always results in a runtime error.
*
* Writing to a private static method (TS 4.3+):
* __classPrivateFieldSet(<any>, <constructor>, <any>, "m", <function>)
* NOTE: This always results in a runtime error.
*/
export const classPrivateFieldSetHelper: UnscopedEmitHelper = {
name: "typescript:classPrivateFieldSet",
importName: "__classPrivateFieldSet",
scoped: false,
text: `
var __classPrivateFieldSet = (this && this.__classPrivateFieldSet) || function (receiver, state, value, kind, f) {
if (kind === "m") throw new TypeError("Private method is not writable");
if (kind === "a" && !f) throw new TypeError("Private accessor was defined without a setter");
if (typeof state === "function" ? receiver !== state || !f : !state.has(receiver)) throw new TypeError("Cannot write private member to an object whose class did not declare it");
return (kind === "a" ? f.call(receiver, value) : f ? f.value = value : state.set(receiver, value)), value;
};`
};
/**
* Parameters:
* @param state — One of the following:
* - A WeakMap when the member is a private instance field.
* - A WeakSet when the member is a private instance method or accessor.
* - A function value that should be the undecorated class constructor when the member is a private static field, method, or accessor.
* @param receiver — The object being checked if it has the private member.
*
* Usage:
* This helper is used to transform `#field in expression` to
* `__classPrivateFieldIn(<weakMap/weakSet/constructor>, expression)`
*/
export const classPrivateFieldInHelper: UnscopedEmitHelper = {
name: "typescript:classPrivateFieldIn",
importName: "__classPrivateFieldIn",
scoped: false,
text: `
var __classPrivateFieldIn = (this && this.__classPrivateFieldIn) || function(state, receiver) {
if (receiver === null || (typeof receiver !== "object" && typeof receiver !== "function")) throw new TypeError("Cannot use 'in' operator on non-object");
return typeof state === "function" ? receiver === state : state.has(receiver);
};`
};
let allUnscopedEmitHelpers: ReadonlyESMap<string, UnscopedEmitHelper> | undefined;
export function getAllUnscopedEmitHelpers() {
return allUnscopedEmitHelpers || (allUnscopedEmitHelpers = arrayToMap([