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{"version":3,"file":"polyfill.es2018.min.js","sources":["../src/stub/symbol.ts","../src/utils.ts","../src/lib/helpers/miscellaneous.ts","../src/lib/helpers/webidl.ts","../src/lib/simple-queue.ts","../src/lib/readable-stream/generic-reader.ts","../src/lib/abstract-ops/internal-methods.ts","../src/stub/number-isfinite.ts","../src/stub/math-trunc.ts","../src/lib/validators/basic.ts","../src/lib/validators/readable-stream.ts","../src/lib/readable-stream/default-reader.ts","../src/target/es2018/stub/async-iterator-prototype.ts","../src/lib/readable-stream/async-iterator.ts","../src/stub/number-isnan.ts","../src/lib/abstract-ops/ecmascript.ts","../src/lib/abstract-ops/miscellaneous.ts","../src/lib/abstract-ops/queue-with-sizes.ts","../src/lib/readable-stream/byte-stream-controller.ts","../src/lib/readable-stream/byob-reader.ts","../src/lib/abstract-ops/queuing-strategy.ts","../src/lib/validators/queuing-strategy.ts","../src/lib/validators/underlying-sink.ts","../src/lib/validators/writable-stream.ts","../src/lib/abort-signal.ts","../src/lib/writable-stream.ts","../src/stub/native.ts","../src/stub/dom-exception.ts","../src/lib/readable-stream/pipe.ts","../src/lib/readable-stream/default-controller.ts","../src/lib/readable-stream/tee.ts","../src/lib/validators/underlying-source.ts","../src/lib/validators/reader-options.ts","../src/lib/validators/pipe-options.ts","../src/lib/readable-stream.ts","../src/lib/validators/readable-writable-pair.ts","../src/lib/validators/iterator-options.ts","../src/lib/validators/queuing-strategy-init.ts","../src/lib/byte-length-queuing-strategy.ts","../src/lib/count-queuing-strategy.ts","../src/lib/validators/transformer.ts","../src/lib/transform-stream.ts","../src/polyfill.ts"],"sourcesContent":["/// <reference lib=\"es2015.symbol\" />\n\nconst SymbolPolyfill: (description?: string) => symbol =\n typeof Symbol === 'function' && typeof Symbol.iterator === 'symbol' ?\n Symbol :\n description => `Symbol(${description})` as any as symbol;\n\nexport default SymbolPolyfill;\n","/// <reference lib=\"dom\" />\n\nexport function noop(): undefined {\n return undefined;\n}\n\nfunction getGlobals() {\n if (typeof self !== 'undefined') {\n return self;\n } else if (typeof window !== 'undefined') {\n return window;\n } else if (typeof global !== 'undefined') {\n return global;\n }\n return undefined;\n}\n\nexport const globals = getGlobals();\n","import { noop } from '../../utils';\nimport { AssertionError } from '../../stub/assert';\n\nexport function typeIsObject(x: any): x is object {\n return (typeof x === 'object' && x !== null) || typeof x === 'function';\n}\n\nexport const rethrowAssertionErrorRejection: (e: any) => void =\n DEBUG ? e => {\n // Used throughout the reference implementation, as `.catch(rethrowAssertionErrorRejection)`, to ensure any errors\n // get shown. There are places in the spec where we do promise transformations and purposefully ignore or don't\n // expect any errors, but assertion errors are always problematic.\n if (e && e instanceof AssertionError) {\n setTimeout(() => {\n throw e;\n }, 0);\n }\n } : noop;\n","import { globals } from '../../utils';\nimport { rethrowAssertionErrorRejection } from './miscellaneous';\nimport assert from '../../stub/assert';\n\nconst originalPromise = Promise;\nconst originalPromiseThen = Promise.prototype.then;\nconst originalPromiseResolve = Promise.resolve.bind(originalPromise);\nconst originalPromiseReject = Promise.reject.bind(originalPromise);\n\nexport function newPromise<T>(executor: (\n resolve: (value: T | PromiseLike<T>) => void,\n reject: (reason?: any) => void\n) => void): Promise<T> {\n return new originalPromise(executor);\n}\n\nexport function promiseResolvedWith<T>(value: T | PromiseLike<T>): Promise<T> {\n return originalPromiseResolve(value);\n}\n\nexport function promiseRejectedWith<T = never>(reason: any): Promise<T> {\n return originalPromiseReject(reason);\n}\n\nexport function PerformPromiseThen<T, TResult1 = T, TResult2 = never>(\n promise: Promise<T>,\n onFulfilled?: (value: T) => TResult1 | PromiseLike<TResult1>,\n onRejected?: (reason: any) => TResult2 | PromiseLike<TResult2>): Promise<TResult1 | TResult2> {\n // There doesn't appear to be any way to correctly emulate the behaviour from JavaScript, so this is just an\n // approximation.\n return originalPromiseThen.call(promise, onFulfilled, onRejected) as Promise<TResult1 | TResult2>;\n}\n\nexport function uponPromise<T>(\n promise: Promise<T>,\n onFulfilled?: (value: T) => void | PromiseLike<void>,\n onRejected?: (reason: any) => void | PromiseLike<void>): void {\n PerformPromiseThen(\n PerformPromiseThen(promise, onFulfilled, onRejected),\n undefined,\n rethrowAssertionErrorRejection\n );\n}\n\nexport function uponFulfillment<T>(promise: Promise<T>, onFulfilled: (value: T) => void | PromiseLike<void>): void {\n uponPromise(promise, onFulfilled);\n}\n\nexport function uponRejection(promise: Promise<unknown>, onRejected: (reason: any) => void | PromiseLike<void>): void {\n uponPromise(promise, undefined, onRejected);\n}\n\nexport function transformPromiseWith<T, TResult1 = T, TResult2 = never>(\n promise: Promise<T>,\n fulfillmentHandler?: (value: T) => TResult1 | PromiseLike<TResult1>,\n rejectionHandler?: (reason: any) => TResult2 | PromiseLike<TResult2>): Promise<TResult1 | TResult2> {\n return PerformPromiseThen(promise, fulfillmentHandler, rejectionHandler);\n}\n\nexport function setPromiseIsHandledToTrue(promise: Promise<unknown>): void {\n PerformPromiseThen(promise, undefined, rethrowAssertionErrorRejection);\n}\n\nexport const queueMicrotask: (fn: () => void) => void = (() => {\n const globalQueueMicrotask = globals && globals.queueMicrotask;\n if (typeof globalQueueMicrotask === 'function') {\n return globalQueueMicrotask;\n }\n\n const resolvedPromise = promiseResolvedWith(undefined);\n return (fn: () => void) => PerformPromiseThen(resolvedPromise, fn);\n})();\n\nexport function reflectCall<T, A extends any[], R>(F: (this: T, ...fnArgs: A) => R, V: T, args: A): R {\n if (typeof F !== 'function') {\n throw new TypeError('Argument is not a function');\n }\n return Function.prototype.apply.call(F, V, args);\n}\n\nexport function promiseCall<T, A extends any[], R>(F: (this: T, ...fnArgs: A) => R | PromiseLike<R>,\n V: T,\n args: A): Promise<R> {\n assert(typeof F === 'function');\n assert(V !== undefined);\n assert(Array.isArray(args));\n try {\n return promiseResolvedWith(reflectCall(F, V, args));\n } catch (value) {\n return promiseRejectedWith(value);\n }\n}\n","import assert from '../stub/assert';\n\n// Original from Chromium\n// https://chromium.googlesource.com/chromium/src/+/0aee4434a4dba42a42abaea9bfbc0cd196a63bc1/third_party/blink/renderer/core/streams/SimpleQueue.js\n\nconst QUEUE_MAX_ARRAY_SIZE = 16384;\n\ninterface Node<T> {\n _elements: T[];\n _next: Node<T> | undefined;\n}\n\n/**\n * Simple queue structure.\n *\n * Avoids scalability issues with using a packed array directly by using\n * multiple arrays in a linked list and keeping the array size bounded.\n */\nexport class SimpleQueue<T> {\n private _front: Node<T>;\n private _back: Node<T>;\n private _cursor = 0;\n private _size = 0;\n\n constructor() {\n // _front and _back are always defined.\n this._front = {\n _elements: [],\n _next: undefined\n };\n this._back = this._front;\n // The cursor is used to avoid calling Array.shift().\n // It contains the index of the front element of the array inside the\n // front-most node. It is always in the range [0, QUEUE_MAX_ARRAY_SIZE).\n this._cursor = 0;\n // When there is only one node, size === elements.length - cursor.\n this._size = 0;\n }\n\n get length(): number {\n return this._size;\n }\n\n // For exception safety, this method is structured in order:\n // 1. Read state\n // 2. Calculate required state mutations\n // 3. Perform state mutations\n push(element: T): void {\n const oldBack = this._back;\n let newBack = oldBack;\n assert(oldBack._next === undefined);\n if (oldBack._elements.length === QUEUE_MAX_ARRAY_SIZE - 1) {\n newBack = {\n _elements: [],\n _next: undefined\n };\n }\n\n // push() is the mutation most likely to throw an exception, so it\n // goes first.\n oldBack._elements.push(element);\n if (newBack !== oldBack) {\n this._back = newBack;\n oldBack._next = newBack;\n }\n ++this._size;\n }\n\n // Like push(), shift() follows the read -> calculate -> mutate pattern for\n // exception safety.\n shift(): T {\n assert(this._size > 0); // must not be called on an empty queue\n\n const oldFront = this._front;\n let newFront = oldFront;\n const oldCursor = this._cursor;\n let newCursor = oldCursor + 1;\n\n const elements = oldFront._elements;\n const element = elements[oldCursor];\n\n if (newCursor === QUEUE_MAX_ARRAY_SIZE) {\n assert(elements.length === QUEUE_MAX_ARRAY_SIZE);\n assert(oldFront._next !== undefined);\n newFront = oldFront._next!;\n newCursor = 0;\n }\n\n // No mutations before this point.\n --this._size;\n this._cursor = newCursor;\n if (oldFront !== newFront) {\n this._front = newFront;\n }\n\n // Permit shifted element to be garbage collected.\n elements[oldCursor] = undefined!;\n\n return element;\n }\n\n // The tricky thing about forEach() is that it can be called\n // re-entrantly. The queue may be mutated inside the callback. It is easy to\n // see that push() within the callback has no negative effects since the end\n // of the queue is checked for on every iteration. If shift() is called\n // repeatedly within the callback then the next iteration may return an\n // element that has been removed. In this case the callback will be called\n // with undefined values until we either \"catch up\" with elements that still\n // exist or reach the back of the queue.\n forEach(callback: (element: T) => void): void {\n let i = this._cursor;\n let node = this._front;\n let elements = node._elements;\n while (i !== elements.length || node._next !== undefined) {\n if (i === elements.length) {\n assert(node._next !== undefined);\n assert(i === QUEUE_MAX_ARRAY_SIZE);\n node = node._next!;\n elements = node._elements;\n i = 0;\n if (elements.length === 0) {\n break;\n }\n }\n callback(elements[i]);\n ++i;\n }\n }\n\n // Return the element that would be returned if shift() was called now,\n // without modifying the queue.\n peek(): T {\n assert(this._size > 0); // must not be called on an empty queue\n\n const front = this._front;\n const cursor = this._cursor;\n return front._elements[cursor];\n }\n}\n","import assert from '../../stub/assert';\nimport { ReadableStream, ReadableStreamCancel, ReadableStreamReader } from '../readable-stream';\nimport { newPromise, setPromiseIsHandledToTrue } from '../helpers/webidl';\n\nexport function ReadableStreamReaderGenericInitialize<R>(reader: ReadableStreamReader<R>, stream: ReadableStream<R>) {\n reader._ownerReadableStream = stream;\n stream._reader = reader;\n\n if (stream._state === 'readable') {\n defaultReaderClosedPromiseInitialize(reader);\n } else if (stream._state === 'closed') {\n defaultReaderClosedPromiseInitializeAsResolved(reader);\n } else {\n assert(stream._state === 'errored');\n\n defaultReaderClosedPromiseInitializeAsRejected(reader, stream._storedError);\n }\n}\n\n// A client of ReadableStreamDefaultReader and ReadableStreamBYOBReader may use these functions directly to bypass state\n// check.\n\nexport function ReadableStreamReaderGenericCancel(reader: ReadableStreamReader<any>, reason: any): Promise<undefined> {\n const stream = reader._ownerReadableStream;\n assert(stream !== undefined);\n return ReadableStreamCancel(stream, reason);\n}\n\nexport function ReadableStreamReaderGenericRelease(reader: ReadableStreamReader<any>) {\n assert(reader._ownerReadableStream !== undefined);\n assert(reader._ownerReadableStream._reader === reader);\n\n if (reader._ownerReadableStream._state === 'readable') {\n defaultReaderClosedPromiseReject(\n reader,\n new TypeError(`Reader was released and can no longer be used to monitor the stream's closedness`));\n } else {\n defaultReaderClosedPromiseResetToRejected(\n reader,\n new TypeError(`Reader was released and can no longer be used to monitor the stream's closedness`));\n }\n\n reader._ownerReadableStream._reader = undefined;\n reader._ownerReadableStream = undefined!;\n}\n\n// Helper functions for the readers.\n\nexport function readerLockException(name: string): TypeError {\n return new TypeError('Cannot ' + name + ' a stream using a released reader');\n}\n\n// Helper functions for the ReadableStreamDefaultReader.\n\nexport function defaultReaderClosedPromiseInitialize(reader: ReadableStreamReader<any>) {\n reader._closedPromise = newPromise((resolve, reject) => {\n reader._closedPromise_resolve = resolve;\n reader._closedPromise_reject = reject;\n });\n}\n\nexport function defaultReaderClosedPromiseInitializeAsRejected(reader: ReadableStreamReader<any>, reason: any) {\n defaultReaderClosedPromiseInitialize(reader);\n defaultReaderClosedPromiseReject(reader, reason);\n}\n\nexport function defaultReaderClosedPromiseInitializeAsResolved(reader: ReadableStreamReader<any>) {\n defaultReaderClosedPromiseInitialize(reader);\n defaultReaderClosedPromiseResolve(reader);\n}\n\nexport function defaultReaderClosedPromiseReject(reader: ReadableStreamReader<any>, reason: any) {\n if (reader._closedPromise_reject === undefined) {\n return;\n }\n\n setPromiseIsHandledToTrue(reader._closedPromise);\n reader._closedPromise_reject(reason);\n reader._closedPromise_resolve = undefined;\n reader._closedPromise_reject = undefined;\n}\n\nexport function defaultReaderClosedPromiseResetToRejected(reader: ReadableStreamReader<any>, reason: any) {\n assert(reader._closedPromise_resolve === undefined);\n assert(reader._closedPromise_reject === undefined);\n\n defaultReaderClosedPromiseInitializeAsRejected(reader, reason);\n}\n\nexport function defaultReaderClosedPromiseResolve(reader: ReadableStreamReader<any>) {\n if (reader._closedPromise_resolve === undefined) {\n return;\n }\n\n reader._closedPromise_resolve(undefined);\n reader._closedPromise_resolve = undefined;\n reader._closedPromise_reject = undefined;\n}\n","export const AbortSteps = Symbol('[[AbortSteps]]');\nexport const ErrorSteps = Symbol('[[ErrorSteps]]');\nexport const CancelSteps = Symbol('[[CancelSteps]]');\nexport const PullSteps = Symbol('[[PullSteps]]');\n","/// <reference lib=\"es2015.core\" />\n\n// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Number/isFinite#Polyfill\nconst NumberIsFinite: typeof Number.isFinite = Number.isFinite || function (x) {\n return typeof x === 'number' && isFinite(x);\n};\n\nexport default NumberIsFinite;\n","/// <reference lib=\"es2015.core\" />\n\n// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Math/trunc#Polyfill\nconst MathTrunc: typeof Math.trunc = Math.trunc || function (v) {\n return v < 0 ? Math.ceil(v) : Math.floor(v);\n};\n\nexport default MathTrunc;\n","import NumberIsFinite from '../../stub/number-isfinite';\nimport MathTrunc from '../../stub/math-trunc';\n\n// https://heycam.github.io/webidl/#idl-dictionaries\nexport function isDictionary(x: any): x is object | null {\n return typeof x === 'object' || typeof x === 'function';\n}\n\nexport function assertDictionary(obj: unknown,\n context: string): asserts obj is object | null | undefined {\n if (obj !== undefined && !isDictionary(obj)) {\n throw new TypeError(`${context} is not an object.`);\n }\n}\n\nexport type AnyFunction = (...args: any[]) => any;\n\n// https://heycam.github.io/webidl/#idl-callback-functions\nexport function assertFunction(x: unknown, context: string): asserts x is AnyFunction {\n if (typeof x !== 'function') {\n throw new TypeError(`${context} is not a function.`);\n }\n}\n\n// https://heycam.github.io/webidl/#idl-object\nexport function isObject(x: any): x is object {\n return (typeof x === 'object' && x !== null) || typeof x === 'function';\n}\n\nexport function assertObject(x: unknown,\n context: string): asserts x is object {\n if (!isObject(x)) {\n throw new TypeError(`${context} is not an object.`);\n }\n}\n\nexport function assertRequiredArgument<T extends any>(x: T | undefined,\n position: number,\n context: string): asserts x is T {\n if (x === undefined) {\n throw new TypeError(`Parameter ${position} is required in '${context}'.`);\n }\n}\n\nexport function assertRequiredField<T extends any>(x: T | undefined,\n field: string,\n context: string): asserts x is T {\n if (x === undefined) {\n throw new TypeError(`${field} is required in '${context}'.`);\n }\n}\n\n// https://heycam.github.io/webidl/#idl-unrestricted-double\nexport function convertUnrestrictedDouble(value: unknown): number {\n return Number(value);\n}\n\nfunction censorNegativeZero(x: number): number {\n return x === 0 ? 0 : x;\n}\n\nfunction integerPart(x: number): number {\n return censorNegativeZero(MathTrunc(x));\n}\n\n// https://heycam.github.io/webidl/#idl-unsigned-long-long\nexport function convertUnsignedLongLongWithEnforceRange(value: unknown, context: string): number {\n const lowerBound = 0;\n const upperBound = Number.MAX_SAFE_INTEGER;\n\n let x = Number(value);\n x = censorNegativeZero(x);\n\n if (!NumberIsFinite(x)) {\n throw new TypeError(`${context} is not a finite number`);\n }\n\n x = integerPart(x);\n\n if (x < lowerBound || x > upperBound) {\n throw new TypeError(`${context} is outside the accepted range of ${lowerBound} to ${upperBound}, inclusive`);\n }\n\n if (!NumberIsFinite(x) || x === 0) {\n return 0;\n }\n\n // TODO Use BigInt if supported?\n // let xBigInt = BigInt(integerPart(x));\n // xBigInt = BigInt.asUintN(64, xBigInt);\n // return Number(xBigInt);\n\n return x;\n}\n","import { IsReadableStream, ReadableStream } from '../readable-stream';\n\nexport function assertReadableStream(x: unknown, context: string): asserts x is ReadableStream {\n if (!IsReadableStream(x)) {\n throw new TypeError(`${context} is not a ReadableStream.`);\n }\n}\n","import assert from '../../stub/assert';\nimport { SimpleQueue } from '../simple-queue';\nimport {\n ReadableStreamReaderGenericCancel,\n ReadableStreamReaderGenericInitialize,\n ReadableStreamReaderGenericRelease,\n readerLockException\n} from './generic-reader';\nimport { IsReadableStreamLocked, ReadableStream } from '../readable-stream';\nimport { typeIsObject } from '../helpers/miscellaneous';\nimport { PullSteps } from '../abstract-ops/internal-methods';\nimport { newPromise, promiseRejectedWith } from '../helpers/webidl';\nimport { assertRequiredArgument } from '../validators/basic';\nimport { assertReadableStream } from '../validators/readable-stream';\n\n/**\n * A result returned by {@link ReadableStreamDefaultReader.read}.\n *\n * @public\n */\nexport type ReadableStreamDefaultReadResult<T> = {\n done: false;\n value: T;\n} | {\n done: true;\n value?: undefined;\n}\n\n// Abstract operations for the ReadableStream.\n\nexport function AcquireReadableStreamDefaultReader<R>(stream: ReadableStream): ReadableStreamDefaultReader<R> {\n return new ReadableStreamDefaultReader(stream);\n}\n\n// ReadableStream API exposed for controllers.\n\nexport function ReadableStreamAddReadRequest<R>(stream: ReadableStream<R>,\n readRequest: ReadRequest<R>): void {\n assert(IsReadableStreamDefaultReader(stream._reader));\n assert(stream._state === 'readable');\n\n (stream._reader! as ReadableStreamDefaultReader<R>)._readRequests.push(readRequest);\n}\n\nexport function ReadableStreamFulfillReadRequest<R>(stream: ReadableStream<R>, chunk: R | undefined, done: boolean) {\n const reader = stream._reader as ReadableStreamDefaultReader<R>;\n\n assert(reader._readRequests.length > 0);\n\n const readRequest = reader._readRequests.shift()!;\n if (done) {\n readRequest._closeSteps();\n } else {\n readRequest._chunkSteps(chunk!);\n }\n}\n\nexport function ReadableStreamGetNumReadRequests<R>(stream: ReadableStream<R>): number {\n return (stream._reader as ReadableStreamDefaultReader<R>)._readRequests.length;\n}\n\nexport function ReadableStreamHasDefaultReader(stream: ReadableStream): boolean {\n const reader = stream._reader;\n\n if (reader === undefined) {\n return false;\n }\n\n if (!IsReadableStreamDefaultReader(reader)) {\n return false;\n }\n\n return true;\n}\n\n// Readers\n\nexport interface ReadRequest<R> {\n _chunkSteps(chunk: R): void;\n\n _closeSteps(): void;\n\n _errorSteps(e: any): void;\n}\n\n/**\n * A default reader vended by a {@link ReadableStream}.\n *\n * @public\n */\nexport class ReadableStreamDefaultReader<R = any> {\n /** @internal */\n _ownerReadableStream!: ReadableStream<R>;\n /** @internal */\n _closedPromise!: Promise<undefined>;\n /** @internal */\n _closedPromise_resolve?: (value?: undefined) => void;\n /** @internal */\n _closedPromise_reject?: (reason: any) => void;\n /** @internal */\n _readRequests: SimpleQueue<ReadRequest<R>>;\n\n constructor(stream: ReadableStream<R>) {\n assertRequiredArgument(stream, 1, 'ReadableStreamDefaultReader');\n assertReadableStream(stream, 'First parameter');\n\n if (IsReadableStreamLocked(stream)) {\n throw new TypeError('This stream has already been locked for exclusive reading by another reader');\n }\n\n ReadableStreamReaderGenericInitialize(this, stream);\n\n this._readRequests = new SimpleQueue();\n }\n\n /**\n * Returns a promise that will be fulfilled when the stream becomes closed,\n * or rejected if the stream ever errors or the reader's lock is released before the stream finishes closing.\n */\n get closed(): Promise<undefined> {\n if (!IsReadableStreamDefaultReader(this)) {\n return promiseRejectedWith(defaultReaderBrandCheckException('closed'));\n }\n\n return this._closedPromise;\n }\n\n /**\n * If the reader is active, behaves the same as {@link ReadableStream.cancel | stream.cancel(reason)}.\n */\n cancel(reason: any = undefined): Promise<void> {\n if (!IsReadableStreamDefaultReader(this)) {\n return promiseRejectedWith(defaultReaderBrandCheckException('cancel'));\n }\n\n if (this._ownerReadableStream === undefined) {\n return promiseRejectedWith(readerLockException('cancel'));\n }\n\n return ReadableStreamReaderGenericCancel(this, reason);\n }\n\n /**\n * Returns a promise that allows access to the next chunk from the stream's internal queue, if available.\n *\n * If reading a chunk causes the queue to become empty, more data will be pulled from the underlying source.\n */\n read(): Promise<ReadableStreamDefaultReadResult<R>> {\n if (!IsReadableStreamDefaultReader(this)) {\n return promiseRejectedWith(defaultReaderBrandCheckException('read'));\n }\n\n if (this._ownerReadableStream === undefined) {\n return promiseRejectedWith(readerLockException('read from'));\n }\n\n let resolvePromise!: (result: ReadableStreamDefaultReadResult<R>) => void;\n let rejectPromise!: (reason: any) => void;\n const promise = newPromise<ReadableStreamDefaultReadResult<R>>((resolve, reject) => {\n resolvePromise = resolve;\n rejectPromise = reject;\n });\n const readRequest: ReadRequest<R> = {\n _chunkSteps: chunk => resolvePromise({ value: chunk, done: false }),\n _closeSteps: () => resolvePromise({ value: undefined, done: true }),\n _errorSteps: e => rejectPromise(e)\n };\n ReadableStreamDefaultReaderRead(this, readRequest);\n return promise;\n }\n\n /**\n * Releases the reader's lock on the corresponding stream. After the lock is released, the reader is no longer active.\n * If the associated stream is errored when the lock is released, the reader will appear errored in the same way\n * from now on; otherwise, the reader will appear closed.\n *\n * A reader's lock cannot be released while it still has a pending read request, i.e., if a promise returned by\n * the reader's {@link ReadableStreamDefaultReader.read | read()} method has not yet been settled. Attempting to\n * do so will throw a `TypeError` and leave the reader locked to the stream.\n */\n releaseLock(): void {\n if (!IsReadableStreamDefaultReader(this)) {\n throw defaultReaderBrandCheckException('releaseLock');\n }\n\n if (this._ownerReadableStream === undefined) {\n return;\n }\n\n if (this._readRequests.length > 0) {\n throw new TypeError('Tried to release a reader lock when that reader has pending read() calls un-settled');\n }\n\n ReadableStreamReaderGenericRelease(this);\n }\n}\n\nObject.defineProperties(ReadableStreamDefaultReader.prototype, {\n cancel: { enumerable: true },\n read: { enumerable: true },\n releaseLock: { enumerable: true },\n closed: { enumerable: true }\n});\nif (typeof Symbol.toStringTag === 'symbol') {\n Object.defineProperty(ReadableStreamDefaultReader.prototype, Symbol.toStringTag, {\n value: 'ReadableStreamDefaultReader',\n configurable: true\n });\n}\n\n// Abstract operations for the readers.\n\nexport function IsReadableStreamDefaultReader<R = any>(x: any): x is ReadableStreamDefaultReader<R> {\n if (!typeIsObject(x)) {\n return false;\n }\n\n if (!Object.prototype.hasOwnProperty.call(x, '_readRequests')) {\n return false;\n }\n\n return x instanceof ReadableStreamDefaultReader;\n}\n\nexport function ReadableStreamDefaultReaderRead<R>(reader: ReadableStreamDefaultReader<R>,\n readRequest: ReadRequest<R>): void {\n const stream = reader._ownerReadableStream;\n\n assert(stream !== undefined);\n\n stream._disturbed = true;\n\n if (stream._state === 'closed') {\n readRequest._closeSteps();\n } else if (stream._state === 'errored') {\n readRequest._errorSteps(stream._storedError);\n } else {\n assert(stream._state === 'readable');\n stream._readableStreamController[PullSteps](readRequest as ReadRequest<any>);\n }\n}\n\n// Helper functions for the ReadableStreamDefaultReader.\n\nfunction defaultReaderBrandCheckException(name: string): TypeError {\n return new TypeError(\n `ReadableStreamDefaultReader.prototype.${name} can only be used on a ReadableStreamDefaultReader`);\n}\n","/// <reference lib=\"es2018.asynciterable\" />\n\n/* eslint-disable @typescript-eslint/no-empty-function */\nexport const AsyncIteratorPrototype: AsyncIterable<any> | undefined =\n Object.getPrototypeOf(Object.getPrototypeOf(async function* (): AsyncIterableIterator<any> {}).prototype);\n","/// <reference lib=\"es2018.asynciterable\" />\n\nimport { ReadableStream } from '../readable-stream';\nimport {\n AcquireReadableStreamDefaultReader,\n ReadableStreamDefaultReader,\n ReadableStreamDefaultReaderRead,\n ReadableStreamDefaultReadResult,\n ReadRequest\n} from './default-reader';\nimport {\n ReadableStreamReaderGenericCancel,\n ReadableStreamReaderGenericRelease,\n readerLockException\n} from './generic-reader';\nimport assert from '../../stub/assert';\nimport { AsyncIteratorPrototype } from '@@target/stub/async-iterator-prototype';\nimport { typeIsObject } from '../helpers/miscellaneous';\nimport {\n newPromise,\n promiseRejectedWith,\n promiseResolvedWith,\n queueMicrotask,\n transformPromiseWith\n} from '../helpers/webidl';\n\n/**\n * An async iterator returned by {@link ReadableStream.values}.\n *\n * @public\n */\nexport interface ReadableStreamAsyncIterator<R> extends AsyncIterator<R> {\n next(): Promise<IteratorResult<R, undefined>>;\n\n return(value?: any): Promise<IteratorResult<any>>;\n}\n\nexport class ReadableStreamAsyncIteratorImpl<R> {\n private readonly _reader: ReadableStreamDefaultReader<R>;\n private readonly _preventCancel: boolean;\n private _ongoingPromise: Promise<ReadableStreamDefaultReadResult<R>> | undefined = undefined;\n private _isFinished = false;\n\n constructor(reader: ReadableStreamDefaultReader<R>, preventCancel: boolean) {\n this._reader = reader;\n this._preventCancel = preventCancel;\n }\n\n next(): Promise<ReadableStreamDefaultReadResult<R>> {\n const nextSteps = () => this._nextSteps();\n this._ongoingPromise = this._ongoingPromise ?\n transformPromiseWith(this._ongoingPromise, nextSteps, nextSteps) :\n nextSteps();\n return this._ongoingPromise;\n }\n\n return(value: any): Promise<ReadableStreamDefaultReadResult<any>> {\n const returnSteps = () => this._returnSteps(value);\n return this._ongoingPromise ?\n transformPromiseWith(this._ongoingPromise, returnSteps, returnSteps) :\n returnSteps();\n }\n\n private _nextSteps(): Promise<ReadableStreamDefaultReadResult<R>> {\n if (this._isFinished) {\n return Promise.resolve({ value: undefined, done: true });\n }\n\n const reader = this._reader;\n if (reader._ownerReadableStream === undefined) {\n return promiseRejectedWith(readerLockException('iterate'));\n }\n\n let resolvePromise!: (result: ReadableStreamDefaultReadResult<R>) => void;\n let rejectPromise!: (reason: any) => void;\n const promise = newPromise<ReadableStreamDefaultReadResult<R>>((resolve, reject) => {\n resolvePromise = resolve;\n rejectPromise = reject;\n });\n const readRequest: ReadRequest<R> = {\n _chunkSteps: chunk => {\n this._ongoingPromise = undefined;\n // This needs to be delayed by one microtask, otherwise we stop pulling too early which breaks a test.\n // FIXME Is this a bug in the specification, or in the test?\n queueMicrotask(() => resolvePromise({ value: chunk, done: false }));\n },\n _closeSteps: () => {\n this._ongoingPromise = undefined;\n this._isFinished = true;\n ReadableStreamReaderGenericRelease(reader);\n resolvePromise({ value: undefined, done: true });\n },\n _errorSteps: reason => {\n this._ongoingPromise = undefined;\n this._isFinished = true;\n ReadableStreamReaderGenericRelease(reader);\n rejectPromise(reason);\n }\n };\n ReadableStreamDefaultReaderRead(reader, readRequest);\n return promise;\n }\n\n private _returnSteps(value: any): Promise<ReadableStreamDefaultReadResult<any>> {\n if (this._isFinished) {\n return Promise.resolve({ value, done: true });\n }\n this._isFinished = true;\n\n const reader = this._reader;\n if (reader._ownerReadableStream === undefined) {\n return promiseRejectedWith(readerLockException('finish iterating'));\n }\n\n assert(reader._readRequests.length === 0);\n\n if (!this._preventCancel) {\n const result = ReadableStreamReaderGenericCancel(reader, value);\n ReadableStreamReaderGenericRelease(reader);\n return transformPromiseWith(result, () => ({ value, done: true }));\n }\n\n ReadableStreamReaderGenericRelease(reader);\n return promiseResolvedWith({ value, done: true });\n }\n}\n\ndeclare class ReadableStreamAsyncIteratorInstance<R> implements ReadableStreamAsyncIterator<R> {\n /** @interal */\n _asyncIteratorImpl: ReadableStreamAsyncIteratorImpl<R>;\n\n next(): Promise<IteratorResult<R, undefined>>;\n\n return(value?: any): Promise<IteratorResult<any>>;\n}\n\nconst ReadableStreamAsyncIteratorPrototype: ReadableStreamAsyncIteratorInstance<any> = {\n next(this: ReadableStreamAsyncIteratorInstance<any>): Promise<ReadableStreamDefaultReadResult<any>> {\n if (!IsReadableStreamAsyncIterator(this)) {\n return promiseRejectedWith(streamAsyncIteratorBrandCheckException('next'));\n }\n return this._asyncIteratorImpl.next();\n },\n\n return(this: ReadableStreamAsyncIteratorInstance<any>, value: any): Promise<ReadableStreamDefaultReadResult<any>> {\n if (!IsReadableStreamAsyncIterator(this)) {\n return promiseRejectedWith(streamAsyncIteratorBrandCheckException('return'));\n }\n return this._asyncIteratorImpl.return(value);\n }\n} as any;\nif (AsyncIteratorPrototype !== undefined) {\n Object.setPrototypeOf(ReadableStreamAsyncIteratorPrototype, AsyncIteratorPrototype);\n}\n\n// Abstract operations for the ReadableStream.\n\nexport function AcquireReadableStreamAsyncIterator<R>(stream: ReadableStream<R>,\n preventCancel: boolean): ReadableStreamAsyncIterator<R> {\n const reader = AcquireReadableStreamDefaultReader<R>(stream);\n const impl = new ReadableStreamAsyncIteratorImpl(reader, preventCancel);\n const iterator: ReadableStreamAsyncIteratorInstance<R> = Object.create(ReadableStreamAsyncIteratorPrototype);\n iterator._asyncIteratorImpl = impl;\n return iterator;\n}\n\nfunction IsReadableStreamAsyncIterator<R = any>(x: any): x is ReadableStreamAsyncIterator<R> {\n if (!typeIsObject(x)) {\n return false;\n }\n\n if (!Object.prototype.hasOwnProperty.call(x, '_asyncIteratorImpl')) {\n return false;\n }\n\n try {\n // noinspection SuspiciousTypeOfGuard\n return (x as ReadableStreamAsyncIteratorInstance<any>)._asyncIteratorImpl instanceof\n ReadableStreamAsyncIteratorImpl;\n } catch {\n return false;\n }\n}\n\n// Helper functions for the ReadableStream.\n\nfunction streamAsyncIteratorBrandCheckException(name: string): TypeError {\n return new TypeError(`ReadableStreamAsyncIterator.${name} can only be used on a ReadableSteamAsyncIterator`);\n}\n","/// <reference lib=\"es2015.core\" />\n\n// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Number/isNaN#Polyfill\nconst NumberIsNaN: typeof Number.isNaN = Number.isNaN || function (x) {\n // eslint-disable-next-line no-self-compare\n return x !== x;\n};\n\nexport default NumberIsNaN;\n","export function CreateArrayFromList<T extends any[]>(elements: T): T {\n // We use arrays to represent lists, so this is basically a no-op.\n // Do a slice though just in case we happen to depend on the unique-ness.\n return elements.slice() as T;\n}\n\nexport function CopyDataBlockBytes(dest: ArrayBuffer,\n destOffset: number,\n src: ArrayBuffer,\n srcOffset: number,\n n: number) {\n new Uint8Array(dest).set(new Uint8Array(src, srcOffset, n), destOffset);\n}\n\n// Not implemented correctly\nexport function TransferArrayBuffer<T extends ArrayBufferLike>(O: T): T {\n return O;\n}\n\n// Not implemented correctly\n// eslint-disable-next-line @typescript-eslint/no-unused-vars\nexport function CanTransferArrayBuffer(O: ArrayBufferLike): boolean {\n return true;\n}\n\n// Not implemented correctly\n// eslint-disable-next-line @typescript-eslint/no-unused-vars\nexport function IsDetachedBuffer(O: ArrayBufferLike): boolean {\n return false;\n}\n\nexport function ArrayBufferSlice(buffer: ArrayBufferLike, begin: number, end: number): ArrayBufferLike {\n // ArrayBuffer.prototype.slice is not available on IE10\n // https://www.caniuse.com/mdn-javascript_builtins_arraybuffer_slice\n if (buffer.slice) {\n return buffer.slice(begin, end);\n }\n const length = end - begin;\n const slice = new ArrayBuffer(length);\n CopyDataBlockBytes(slice, 0, buffer, begin, length);\n return slice;\n}\n","import NumberIsNaN from '../../stub/number-isnan';\nimport { ArrayBufferSlice } from './ecmascript';\n\nexport function IsNonNegativeNumber(v: number): boolean {\n if (typeof v !== 'number') {\n return false;\n }\n\n if (NumberIsNaN(v)) {\n return false;\n }\n\n if (v < 0) {\n return false;\n }\n\n return true;\n}\n\nexport function CloneAsUint8Array(O: ArrayBufferView): Uint8Array {\n const buffer = ArrayBufferSlice(O.buffer, O.byteOffset, O.byteOffset + O.byteLength);\n return new Uint8Array(buffer);\n}\n","import assert from '../../stub/assert';\nimport { SimpleQueue } from '../simple-queue';\nimport { IsNonNegativeNumber } from './miscellaneous';\n\nexport interface QueueContainer<T> {\n _queue: SimpleQueue<T>;\n _queueTotalSize: number;\n}\n\nexport interface QueuePair<T> {\n value: T;\n size: number;\n}\n\nexport function DequeueValue<T>(container: QueueContainer<QueuePair<T>>): T {\n assert('_queue' in container && '_queueTotalSize' in container);\n assert(container._queue.length > 0);\n\n const pair = container._queue.shift()!;\n container._queueTotalSize -= pair.size;\n if (container._queueTotalSize < 0) {\n container._queueTotalSize = 0;\n }\n\n return pair.value;\n}\n\nexport function EnqueueValueWithSize<T>(container: QueueContainer<QueuePair<T>>, value: T, size: number) {\n assert('_queue' in container && '_queueTotalSize' in container);\n\n if (!IsNonNegativeNumber(size) || size === Infinity) {\n throw new RangeError('Size must be a finite, non-NaN, non-negative number.');\n }\n\n container._queue.push({ value, size });\n container._queueTotalSize += size;\n}\n\nexport function PeekQueueValue<T>(container: QueueContainer<QueuePair<T>>): T {\n assert('_queue' in container && '_queueTotalSize' in container);\n assert(container._queue.length > 0);\n\n const pair = container._queue.peek();\n return pair.value;\n}\n\nexport function ResetQueue<T>(container: QueueContainer<T>) {\n assert('_queue' in container && '_queueTotalSize' in container);\n\n container._queue = new SimpleQueue<T>();\n container._queueTotalSize = 0;\n}\n","import assert from '../../stub/assert';\nimport { SimpleQueue } from '../simple-queue';\nimport { ResetQueue } from '../abstract-ops/queue-with-sizes';\nimport {\n ReadableStreamAddReadRequest,\n ReadableStreamFulfillReadRequest,\n ReadableStreamGetNumReadRequests,\n ReadableStreamHasDefaultReader,\n ReadRequest\n} from './default-reader';\nimport {\n ReadableStreamAddReadIntoRequest,\n ReadableStreamFulfillReadIntoRequest,\n ReadableStreamGetNumReadIntoRequests,\n ReadableStreamHasBYOBReader,\n ReadIntoRequest\n} from './byob-reader';\nimport NumberIsInteger from '../../stub/number-isinteger';\nimport {\n IsReadableStreamLocked,\n ReadableByteStream,\n ReadableStreamClose,\n ReadableStreamError\n} from '../readable-stream';\nimport { ValidatedUnderlyingByteSource } from './underlying-source';\nimport { typeIsObject } from '../helpers/miscellaneous';\nimport {\n ArrayBufferSlice,\n CanTransferArrayBuffer,\n CopyDataBlockBytes,\n IsDetachedBuffer,\n TransferArrayBuffer\n} from '../abstract-ops/ecmascript';\nimport { CancelSteps, PullSteps } from '../abstract-ops/internal-methods';\nimport { promiseResolvedWith, uponPromise } from '../helpers/webidl';\nimport { assertRequiredArgument, convertUnsignedLongLongWithEnforceRange } from '../validators/basic';\n\n/**\n * A pull-into request in a {@link ReadableByteStreamController}.\n *\n * @public\n */\nexport class ReadableStreamBYOBRequest {\n /** @internal */\n _associatedReadableByteStreamController!: ReadableByteStreamController;\n /** @internal */\n _view!: ArrayBufferView | null;\n\n private constructor() {\n throw new TypeError('Illegal constructor');\n }\n\n /**\n * Returns the view for writing in to, or `null` if the BYOB request has already been responded to.\n */\n get view(): ArrayBufferView | null {\n if (!IsReadableStreamBYOBRequest(this)) {\n throw byobRequestBrandCheckException('view');\n }\n\n return this._view;\n }\n\n /**\n * Indicates to the associated readable byte stream that `bytesWritten` bytes were written into\n * {@link ReadableStreamBYOBRequest.view | view}, causing the result be surfaced to the consumer.\n *\n * After this method is called, {@link ReadableStreamBYOBRequest.view | view} will be transferred and no longer\n * modifiable.\n */\n respond(bytesWritten: number): void;\n respond(bytesWritten: number | undefined): void {\n if (!IsReadableStreamBYOBRequest(this)) {\n throw byobRequestBrandCheckException('respond');\n }\n assertRequiredArgument(bytesWritten, 1, 'respond');\n bytesWritten = convertUnsignedLongLongWithEnforceRange(bytesWritten, 'First parameter');\n\n if (this._associatedReadableByteStreamController === undefined) {\n throw new TypeError('This BYOB request has been invalidated');\n }\n\n if (IsDetachedBuffer(this._view!.buffer)) {\n throw new TypeError(`The BYOB request's buffer has been detached and so cannot be used as a response`);\n }\n\n assert(this._view!.byteLength > 0);\n assert(this._view!.buffer.byteLength > 0);\n\n ReadableByteStreamControllerRespond(this._associatedReadableByteStreamController, bytesWritten);\n }\n\n /**\n * Indicates to the associated readable byte stream that instead of writing into\n * {@link ReadableStreamBYOBRequest.view | view}, the underlying byte source is providing a new `ArrayBufferView`,\n * which will be given to the consumer of the readable byte stream.\n *\n * After this method is called, `view` will be transferred and no longer modifiable.\n */\n respondWithNewView(view: ArrayBufferView): void;\n respondWithNewView(view: ArrayBufferView | undefined): void {\n if (!IsReadableStreamBYOBRequest(this)) {\n throw byobRequestBrandCheckException('respondWithNewView');\n }\n assertRequiredArgument(view, 1, 'respondWithNewView');\n\n if (!ArrayBuffer.isView(view)) {\n throw new TypeError('You can only respond with array buffer views');\n }\n\n if (this._associatedReadableByteStreamController === undefined) {\n throw new TypeError('This BYOB request has been invalidated');\n }\n\n if (IsDetachedBuffer(view.buffer)) {\n throw new TypeError('The given view\\'s buffer has been detached and so cannot be used as a response');\n }\n\n ReadableByteStreamControllerRespondWithNewView(this._associatedReadableByteStreamController, view);\n }\n}\n\nObject.defineProperties(ReadableStreamBYOBRequest.prototype, {\n respond: { enumerable: true },\n respondWithNewView: { enumerable: true },\n view: { enumerable: true }\n});\nif (typeof Symbol.toStringTag === 'symbol') {\n Object.defineProperty(ReadableStreamBYOBRequest.prototype, Symbol.toStringTag, {\n value: 'ReadableStreamBYOBRequest',\n configurable: true\n });\n}\n\ninterface ArrayBufferViewConstructor<T extends ArrayBufferView = ArrayBufferView> {\n new(buffer: ArrayBufferLike, byteOffset: number, length?: number): T;\n\n readonly prototype: T;\n readonly BYTES_PER_ELEMENT: number;\n}\n\ninterface ByteQueueElement {\n buffer: ArrayBufferLike;\n byteOffset: number;\n byteLength: number;\n}\n\ntype PullIntoDescriptor<T extends ArrayBufferView = ArrayBufferView> =\n DefaultPullIntoDescriptor\n | BYOBPullIntoDescriptor<T>;\n\ninterface DefaultPullIntoDescriptor {\n buffer: ArrayBufferLike;\n bufferByteLength: number;\n byteOffset: number;\n byteLength: number;\n bytesFilled: number;\n elementSize: number;\n viewConstructor: ArrayBufferViewConstructor<Uint8Array>;\n readerType: 'default';\n}\n\ninterface BYOBPullIntoDescriptor<T extends ArrayBufferView = ArrayBufferView> {\n buffer: ArrayBufferLike;\n bufferByteLength: number;\n byteOffset: number;\n byteLength: number;\n bytesFilled: number;\n elementSize: number;\n viewConstructor: ArrayBufferViewConstructor<T>;\n readerType: 'byob';\n}\n\n/**\n * Allows control of a {@link ReadableStream | readable byte stream}'s state and internal queue.\n *\n * @public\n */\nexport class ReadableByteStreamController {\n /** @internal */\n _controlledReadableByteStream!: ReadableByteStream;\n /** @internal */\n _queue!: SimpleQueue<ByteQueueElement>;\n /** @internal */\n _queueTotalSize!: number;\n /** @internal */\n _started!: boolean;\n /** @internal */\n _closeRequested!: boolean;\n /** @internal */\n _pullAgain!: boolean;\n /** @internal */\n _pulling !: boolean;\n /** @internal */\n _strategyHWM!: number;\n /** @internal */\n _pullAlgorithm!: () => Promise<void>;\n /** @internal */\n _cancelAlgorithm!: (reason: any) => Promise<void>;\n /** @internal */\n _autoAllocateChunkSize: number | undefined;\n /** @internal */\n _byobRequest: ReadableStreamBYOBRequest | null;\n /** @internal */\n _pendingPullIntos!: SimpleQueue<PullIntoDescriptor>;\n\n private constructor() {\n throw new TypeError('Illegal constructor');\n }\n\n /**\n * Returns the current BYOB pull request, or `null` if there isn't one.\n */\n get byobRequest(): ReadableStreamBYOBRequest | null {\n if (!IsReadableByteStreamController(this)) {\n throw byteStreamControllerBrandCheckException('byobRequest');\n }\n\n return ReadableByteStreamControllerGetBYOBRequest(this);\n }\n\n /**\n * Returns the desired size to fill the controlled stream's internal queue. It can be negative, if the queue is\n * over-full. An underlying byte source ought to use this information to determine when and how to apply backpressure.\n */\n get desiredSize(): number | null {\n if (!IsReadableByteStreamController(this)) {\n throw byteStreamControllerBrandCheckException('desiredSize');\n }\n\n return ReadableByteStreamControllerGetDesiredSize(this);\n }\n\n /**\n * Closes the controlled readable stream. Consumers will still be able to read any previously-enqueued chunks from\n * the stream, but once those are read, the stream will become closed.\n */\n close(): void {\n if (!IsReadableByteStreamController(this)) {\n throw byteStreamControllerBrandCheckException('close');\n }\n\n if (this._closeRequested) {\n throw new TypeError('The stream has already been closed; do not close it again!');\n }\n\n const state = this._controlledReadableByteStream._state;\n if (state !== 'readable') {\n throw new TypeError(`The stream (in ${state} state) is not in the readable state and cannot be closed`);\n }\n\n ReadableByteStreamControllerClose(this);\n }\n\n /**\n * Enqueues the given chunk chunk in the controlled readable stream.\n * The chunk has to be an `ArrayBufferView` instance, or else a `TypeError` will be thrown.\n */\n enqueue(chunk: ArrayBufferView): void;\n enqueue(chunk: ArrayBufferView | undefined): void {\n if (!IsReadableByteStreamController(this)) {\n throw byteStreamControllerBrandCheckException('enqueue');\n }\n\n assertRequiredArgument(chunk, 1, 'enqueue');\n if (!ArrayBuffer.isView(chunk)) {\n throw new TypeError('chunk must be an array buffer view');\n }\n if (chunk.byteLength === 0) {\n throw new TypeError('chunk must have non-zero byteLength');\n }\n if (chunk.buffer.byteLength === 0) {\n throw new TypeError(`chunk's buffer must have non-zero byteLength`);\n }\n\n if (this._closeRequested) {\n throw new TypeError('stream is closed or draining');\n }\n\n const state = this._controlledReadableByteStream._state;\n if (state !== 'readable') {\n throw new TypeError(`The stream (in ${state} state) is not in the readable state and cannot be enqueued to`);\n }\n\n ReadableByteStreamControllerEnqueue(this, chunk);\n }\n\n /**\n * Errors the controlled readable stream, making all future interactions with it fail with the given error `e`.\n */\n error(e: any = undefined): void {\n if (!IsReadableByteStreamController(this)) {\n throw byteStreamControllerBrandCheckException('error');\n }\n\n ReadableByteStreamControllerError(this, e);\n }\n\n /** @internal */\n [CancelSteps](reason: any): Promise<void> {\n ReadableByteStreamControllerClearPendingPullIntos(this);\n\n ResetQueue(this);\n\n const result = this._cancelAlgorithm(reason);\n ReadableByteStreamControllerClearAlgorithms(this);\n return result;\n }\n\n /** @internal */\n [PullSteps](readRequest: ReadRequest<Uint8Array>): void {\n const stream = this._controlledReadableByteStream;\n assert(ReadableStreamHasDefaultReader(stream));\n\n if (this._queueTotalSize > 0) {\n assert(ReadableStreamGetNumReadRequests(stream) === 0);\n\n const entry = this._queue.shift()!;\n this._queueTotalSize -= entry.byteLength;\n\n ReadableByteStreamControllerHandleQueueDrain(this);\n\n const view = new Uint8Array(entry.buffer, entry.byteOffset, entry.byteLength);\n\n readRequest._chunkSteps(view);\n return;\n }\n\n const autoAllocateChunkSize = this._autoAllocateChunkSize;\n if (autoAllocateChunkSize !== undefined) {\n let buffer: ArrayBuffer;\n try {\n buffer = new ArrayBuffer(autoAllocateChunkSize);\n } catch (bufferE) {\n readRequest._errorSteps(bufferE);\n return;\n }\n\n const pullIntoDescriptor: DefaultPullIntoDescriptor = {\n buffer,\n bufferByteLength: autoAllocateChunkSize,\n byteOffset: 0,\n byteLength: autoAllocateChunkSize,\n bytesFilled: 0,\n elementSize: 1,\n viewConstructor: Uint8Array,\n readerType: 'default'\n };\n\n this._pendingPullIntos.push(pullIntoDescriptor);\n }\n\n ReadableStreamAddReadRequest(stream, readRequest);\n ReadableByteStreamControllerCallPullIfNeeded(this);\n }\n}\n\nObject.defineProperties(ReadableByteStreamController.prototype, {\n close: { enumerable: true },\n enqueue: { enumerable: true },\n error: { enumerable: true },\n byobRequest: { enumerable: true },\n desiredSize: { enumerable: true }\n});\nif (typeof Symbol.toStringTag === 'symbol') {\n Object.defineProperty(ReadableByteStreamController.prototype, Symbol.toStringTag, {\n value: 'ReadableByteStreamController',\n configurable: true\n });\n}\n\n// Abstract operations for the ReadableByteStreamController.\n\nexport function IsReadableByteStreamController(x: any): x is ReadableByteStreamController {\n if (!typeIsObject(x)) {\n return false;\n }\n\n if (!Object.prototype.hasOwnProperty.call(x, '_controlledReadableByteStream')) {\n return false;\n }\n\n return x instanceof ReadableByteStreamController;\n}\n\nfunction IsReadableStreamBYOBRequest(x: any): x is ReadableStreamBYOBRequest {\n if (!typeIsObject(x)) {\n return false;\n }\n\n if (!Object.prototype.hasOwnProperty.call(x, '_associatedReadableByteStreamController')) {\n return false;\n }\n\n return x instanceof ReadableStreamBYOBRequest;\n}\n\nfunction ReadableByteStreamControllerCallPullIfNeeded(controller: ReadableByteStreamController): void {\n const shouldPull = ReadableByteStreamControllerShouldCallPull(controller);\n if (!shouldPull) {\n return;\n }\n\n if (controller._pulling) {\n controller._pullAgain = true;\n return;\n }\n\n assert(!controller._pullAgain);\n\n controller._pulling = true;\n\n // TODO: Test controller argument\n const pullPromise = controller._pullAlgorithm();\n uponPromise(\n pullPromise,\n () => {\n controller._pulling = false;\n\n if (controller._pullAgain) {\n controller._pullAgain = false;\n ReadableByteStreamControllerCallPullIfNeeded(controller);\n }\n },\n e => {\n ReadableByteStreamControllerError(controller, e);\n }\n );\n}\n\nfunction ReadableByteStreamControllerClearPendingPullIntos(controller: ReadableByteStreamController) {\n ReadableByteStreamControllerInvalidateBYOBRequest(controller);\n controller._pendingPullIntos = new SimpleQueue();\n}\n\nfunction ReadableByteStreamControllerCommitPullIntoDescriptor<T extends ArrayBufferView>(\n stream: ReadableByteStream,\n pullIntoDescriptor: PullIntoDescriptor<T>\n) {\n assert(stream._state !== 'errored');\n\n let done = false;\n if (stream._state === 'closed') {\n assert(pullIntoDescriptor.bytesFilled === 0);\n done = true;\n }\n\n const filledView = ReadableByteStreamControllerConvertPullIntoDescriptor<T>(pullIntoDescriptor);\n if (pullIntoDescriptor.readerType === 'default') {\n ReadableStreamFulfillReadRequest(stream, filledView as unknown as Uint8Array, done);\n } else {\n assert(pullIntoDescriptor.readerType === 'byob');\n ReadableStreamFulfillReadIntoRequest(stream, filledView, done);\n }\n}\n\nfunction ReadableByteStreamControllerConvertPullIntoDescriptor<T extends ArrayBufferView>(\n pullIntoDescriptor: PullIntoDescriptor<T>\n): T {\n const bytesFilled = pullIntoDescriptor.bytesFilled;\n const elementSize = pullIntoDescriptor.elementSize;\n\n assert(bytesFilled <= pullIntoDescriptor.byteLength);\n assert(bytesFilled % elementSize === 0);\n\n return new pullIntoDescriptor.viewConstructor(\n pullIntoDescriptor.buffer, pullIntoDescriptor.byteOffset, bytesFilled / elementSize) as T;\n}\n\nfunction ReadableByteStreamControllerEnqueueChunkToQueue(controller: ReadableByteStreamController,\n buffer: ArrayBufferLike,\n byteOffset: number,\n byteLength: number) {\n controller._queue.push({ buffer, byteOffset, byteLength });\n controller._queueTotalSize += byteLength;\n}\n\nfunction ReadableByteStreamControllerFillPullIntoDescriptorFromQueue(controller: ReadableByteStreamController,\n pullIntoDescriptor: PullIntoDescriptor) {\n const elementSize = pullIntoDescriptor.elementSize;\n\n const currentAlignedBytes = pullIntoDescriptor.bytesFilled - pullIntoDescriptor.bytesFilled % elementSize;\n\n const maxBytesToCopy = Math.min(controller._queueTotalSize,\n pullIntoDescriptor.byteLength - pullIntoDescriptor.bytesFilled);\n const maxBytesFilled = pullIntoDescriptor.bytesFilled + maxBytesToCopy;\n const maxAlignedBytes = maxBytesFilled - maxBytesFilled % elementSize;\n\n let totalBytesToCopyRemaining = maxBytesToCopy;\n let ready = false;\n if (maxAlignedBytes > currentAlignedBytes) {\n totalBytesToCopyRemaining = maxAlignedBytes - pullIntoDescriptor.bytesFilled;\n ready = true;\n }\n\n const queue = controller._queue;\n\n while (totalBytesToCopyRemaining > 0) {\n const headOfQueue = queue.peek();\n\n const bytesToCopy = Math.min(totalBytesToCopyRemaining, headOfQueue.byteLength);\n\n const destStart = pullIntoDescriptor.byteOffset + pullIntoDescriptor.bytesFilled;\n CopyDataBlockBytes(pullIntoDescriptor.buffer, destStart, headOfQueue.buffer, headOfQueue.byteOffset, bytesToCopy);\n\n if (headOfQueue.byteLength === bytesToCopy) {\n queue.shift();\n } else {\n headOfQueue.byteOffset += bytesToCopy;\n headOfQueue.byteLength -= bytesToCopy;\n }\n controller._queueTotalSize -= bytesToCopy;\n\n ReadableByteStreamControllerFillHeadPullIntoDescriptor(controller, bytesToCopy, pullIntoDescriptor);\n\n totalBytesToCopyRemaining -= bytesToCopy;\n }\n\n if (!ready) {\n assert(controller._queueTotalSize === 0);\n assert(pullIntoDescriptor.bytesFilled > 0);\n assert(pullIntoDescriptor.bytesFilled < pullIntoDescriptor.elementSize);\n }\n\n return ready;\n}\n\nfunction ReadableByteStreamControllerFillHeadPullIntoDescriptor(controller: ReadableByteStreamController,\n size: number,\n pullIntoDescriptor: PullIntoDescriptor) {\n assert(controller._pendingPullIntos.length === 0 || controller._pendingPullIntos.peek() === pullIntoDescriptor);\n assert(controller._byobRequest === null);\n pullIntoDescriptor.bytesFilled += size;\n}\n\nfunction ReadableByteStreamControllerHandleQueueDrain(controller: ReadableByteStreamController) {\n assert(controller._controlledReadableByteStream._state === 'readable');\n\n if (controller._queueTotalSize === 0 && controller._closeRequested) {\n ReadableByteStreamControllerClearAlgorithms(controller);\n ReadableStreamClose(controller._controlledReadableByteStream);\n } else {\n ReadableByteStreamControllerCallPullIfNeeded(controller);\n }\n}\n\nfunction ReadableByteStreamControllerInvalidateBYOBRequest(controller: ReadableByteStreamController) {\n if (controller._byobRequest === null) {\n return;\n }\n\n controller._byobRequest._associatedReadableByteStreamController = undefined!;\n controller._byobRequest._view = null!;\n controller._byobRequest = null;\n}\n\nfunction ReadableByteStreamControllerProcessPullIntoDescriptorsUsingQueue(controller: ReadableByteStreamController) {\n assert(!controller._closeRequested);\n\n while (controller._pendingPullIntos.length > 0) {\n if (controller._queueTotalSize === 0) {\n return;\n }\n\n const pullIntoDescriptor = controller._pendingPullIntos.peek();\n\n if (ReadableByteStreamControllerFillPullIntoDescriptorFromQueue(controller, pullIntoDescriptor)) {\n ReadableByteStreamControllerShiftPendingPullInto(controller);\n\n ReadableByteStreamControllerCommitPullIntoDescriptor(\n controller._controlledReadableByteStream,\n pullIntoDescriptor\n );\n }\n }\n}\n\nexport function ReadableByteStreamControllerPullInto<T extends ArrayBufferView>(\n controller: ReadableByteStreamController,\n view: T,\n readIntoRequest: ReadIntoRequest<T>\n): void {\n const stream = controller._controlledReadableByteStream;\n\n let elementSize = 1;\n if (view.constructor !== DataView) {\n elementSize = (view.constructor as ArrayBufferViewConstructor<T>).BYTES_PER_ELEMENT;\n }\n\n const ctor = view.constructor as ArrayBufferViewConstructor<T>;\n\n // try {\n const buffer = TransferArrayBuffer(view.buffer);\n // } catch (e) {\n // readIntoRequest._errorSteps(e);\n // return;\n // }\n\n const pullIntoDescriptor: BYOBPullIntoDescriptor<T> = {\n buffer,\n bufferByteLength: buffer.byteLength,\n byteOffset: view.byteOffset,\n byteLength: view.byteLength,\n bytesFilled: 0,\n elementSize,\n viewConstructor: ctor,\n readerType: 'byob'\n };\n\n if (controller._pendingPullIntos.length > 0) {\n controller._pendingPullIntos.push(pullIntoDescriptor);\n\n // No ReadableByteStreamControllerCallPullIfNeeded() call since:\n // - No change happens on desiredSize\n // - The source has already been notified of that there's at least 1 pending read(view)\n\n ReadableStreamAddReadIntoRequest(stream, readIntoRequest);\n return;\n }\n\n if (stream._state === 'closed') {\n const emptyView = new ctor(pullIntoDescriptor.buffer, pullIntoDescriptor.byteOffset, 0);\n readIntoRequest._closeSteps(emptyView);\n return;\n }\n\n if (controller._queueTotalSize > 0) {\n if (ReadableByteStreamControllerFillPullIntoDescriptorFromQueue(controller, pullIntoDescriptor)) {\n const filledView = ReadableByteStreamControllerConvertPullIntoDescriptor<T>(pullIntoDescriptor);\n\n ReadableByteStreamControllerHandleQueueDrain(controller);\n\n readIntoRequest._chunkSteps(filledView);\n return;\n }\n\n if (controller._closeRequested) {\n const e = new TypeError('Insufficient bytes to fill elements in the given buffer');\n ReadableByteStreamControllerError(controller, e);\n\n readIntoRequest._errorSteps(e);\n return;\n }\n }\n\n controller._pendingPullIntos.push(pullIntoDescriptor);\n\n ReadableStreamAddReadIntoRequest<T>(stream, readIntoRequest);\n ReadableByteStreamControllerCallPullIfNeeded(controller);\n}\n\nfunction ReadableByteStreamControllerRespondInClosedState(controller: ReadableByteStreamController,\n firstDescriptor: PullIntoDescriptor) {\n assert(firstDescriptor.bytesFilled === 0);\n\n const stream = controller._controlledReadableByteStream;\n if (ReadableStreamHasBYOBReader(stream)) {\n while (ReadableStreamGetNumReadIntoRequests(stream) > 0) {\n const pullIntoDescriptor = ReadableByteStreamControllerShiftPendingPullInto(controller);\n ReadableByteStreamControllerCommitPullIntoDescriptor(stream, pullIntoDescriptor);\n }\n }\n}\n\nfunction ReadableByteStreamControllerRespondInReadableState(controller: ReadableByteStreamController,\n bytesWritten: number,\n pullIntoDescriptor: PullIntoDescriptor) {\n assert(pullIntoDescriptor.bytesFilled + bytesWritten <= pullIntoDescriptor.byteLength);\n\n ReadableByteStreamControllerFillHeadPullIntoDescriptor(controller, bytesWritten, pullIntoDescriptor);\n\n if (pullIntoDescriptor.bytesFilled < pullIntoDescriptor.elementSize) {\n return;\n }\n\n ReadableByteStreamControllerShiftPendingPullInto(controller);\n\n const remainderSize = pullIntoDescriptor.bytesFilled % pullIntoDescriptor.elementSize;\n if (remainderSize > 0) {\n const end = pullIntoDescriptor.byteOffset + pullIntoDescriptor.bytesFilled;\n const remainder = ArrayBufferSlice(pullIntoDescriptor.buffer, end - remainderSize, end);\n ReadableByteStreamControllerEnqueueChunkToQueue(controller, remainder, 0, remainder.byteLength);\n }\n\n pullIntoDescriptor.bytesFilled -= remainderSize;\n ReadableByteStreamControllerCommitPullIntoDescriptor(controller._controlledReadableByteStream, pullIntoDescriptor);\n\n ReadableByteStreamControllerProcessPullIntoDescriptorsUsingQueue(controller);\n}\n\nfunction ReadableByteStreamControllerRespondInternal(controller: ReadableByteStreamController, bytesWritten: number) {\n const firstDescriptor = controller._pendingPullIntos.peek();\n assert(CanTransferArrayBuffer(firstDescriptor.buffer));\n\n ReadableByteStreamControllerInvalidateBYOBRequest(controller);\n\n const state = controller._controlledReadableByteStream._state;\n if (state === 'closed') {\n assert(bytesWritten === 0);\n ReadableByteStreamControllerRespondInClosedState(controller, firstDescriptor);\n } else {\n assert(state === 'readable');\n assert(bytesWritten > 0);\n ReadableByteStreamControllerRespondInReadableState(controller, bytesWritten, firstDescriptor);\n }\n\n ReadableByteStreamControllerCallPullIfNeeded(controller);\n}\n\nfunction ReadableByteStreamControllerShiftPendingPullInto(\n controller: ReadableByteStreamController\n): PullIntoDescriptor {\n assert(controller._byobRequest === null);\n const descriptor = controller._pendingPullIntos.shift()!;\n return descriptor;\n}\n\nfunction ReadableByteStreamControllerShouldCallPull(controller: ReadableByteStreamController): boolean {\n const stream = controller._controlledReadableByteStream;\n\n if (stream._state !== 'readable') {\n return false;\n }\n\n if (controller._closeRequested) {\n return false;\n }\n\n if (!controller._started) {\n return false;\n }\n\n if (ReadableStreamHasDefaultReader(stream) && ReadableStreamGetNumReadRequests(stream) > 0) {\n return true;\n }\n\n if (ReadableStreamHasBYOBReader(stream) && ReadableStreamGetNumReadIntoRequests(stream) > 0) {\n return true;\n }\n\n const desiredSize = ReadableByteStreamControllerGetDesiredSize(controller);\n assert(desiredSize !== null);\n if (desiredSize! > 0) {\n return true;\n }\n\n return false;\n}\n\nfunction ReadableByteStreamControllerClearAlgorithms(controller: ReadableByteStreamController) {\n controller._pullAlgorithm = undefined!;\n controller._cancelAlgorithm = undefined!;\n}\n\n// A client of ReadableByteStreamController may use these functions directly to bypass state check.\n\nexport function ReadableByteStreamControllerClose(controller: ReadableByteStreamController) {\n const stream = controller._controlledReadableByteStream;\n\n if (controller._closeRequested || stream._state !== 'readable') {\n return;\n }\n\n if (controller._queueTotalSize > 0) {\n controller._closeRequested = true;\n\n return;\n }\n\n if (controller._pendingPullIntos.length > 0) {\n const firstPendingPullInto = controller._pendingPullIntos.peek();\n if (firstPendingPullInto.bytesFilled > 0) {\n const e = new TypeError('Insufficient bytes to fill elements in the given buffer');\n ReadableByteStreamControllerError(controller, e);\n\n throw e;\n }\n }\n\n ReadableByteStreamControllerClearAlgorithms(controller);\n ReadableStreamClose(stream);\n}\n\nexport function ReadableByteStreamControllerEnqueue(controller: ReadableByteStreamController, chunk: ArrayBufferView) {\n const stream = controller._controlledReadableByteStream;\n\n if (controller._closeRequested || stream._state !== 'readable') {\n return;\n }\n\n const buffer = chunk.buffer;\n const byteOffset = chunk.byteOffset;\n const byteLength = chunk.byteLength;\n if (IsDetachedBuffer(buffer)) {\n throw new TypeError('chunk\\'s buffer is detached and so cannot be enqueued');\n }\n const transferredBuffer = TransferArrayBuffer(buffer);\n\n if (controller._pendingPullIntos.length > 0) {\n const firstPendingPullInto = controller._pendingPullIntos.peek();\n if (IsDetachedBuffer(firstPendingPullInto.buffer)) {\n throw new TypeError(\n 'The BYOB request\\'s buffer has been detached and so cannot be filled with an enqueued chunk'\n );\n }\n firstPendingPullInto.buffer = TransferArrayBuffer(firstPendingPullInto.buffer);\n }\n\n ReadableByteStreamControllerInvalidateBYOBRequest(controller);\n\n if (ReadableStreamHasDefaultReader(stream)) {\n if (ReadableStreamGetNumReadRequests(stream) === 0) {\n assert(controller._pendingPullIntos.length === 0);\n ReadableByteStreamControllerEnqueueChunkToQueue(controller, transferredBuffer, byteOffset, byteLength);\n } else {\n assert(controller._queue.length === 0);\n if (controller._pendingPullIntos.length > 0) {\n assert(controller._pendingPullIntos.peek().readerType === 'default');\n ReadableByteStreamControllerShiftPendingPullInto(controller);\n }\n const transferredView = new Uint8Array(transferredBuffer, byteOffset, byteLength);\n ReadableStreamFulfillReadRequest(stream, transferredView, false);\n }\n } else if (ReadableStreamHasBYOBReader(stream)) {\n // TODO: Ideally in this branch detaching should happen only if the buffer is not consumed fully.\n ReadableByteStreamControllerEnqueueChunkToQueue(controller, transferredBuffer, byteOffset, byteLength);\n ReadableByteStreamControllerProcessPullIntoDescriptorsUsingQueue(controller);\n } else {\n assert(!IsReadableStreamLocked(stream));\n ReadableByteStreamControllerEnqueueChunkToQueue(controller, transferredBuffer, byteOffset, byteLength);\n }\n\n ReadableByteStreamControllerCallPullIfNeeded(controller);\n}\n\nexport function ReadableByteStreamControllerError(controller: ReadableByteStreamController, e: any) {\n const stream = controller._controlledReadableByteStream;\n\n if (stream._state !== 'readable') {\n return;\n }\n\n ReadableByteStreamControllerClearPendingPullIntos(controller);\n\n ResetQueue(controller);\n ReadableByteStreamControllerClearAlgorithms(controller);\n ReadableStreamError(stream, e);\n}\n\nexport function ReadableByteStreamControllerGetBYOBRequest(\n controller: ReadableByteStreamController\n): ReadableStreamBYOBRequest | null {\n if (controller._byobRequest === null && controller._pendingPullIntos.length > 0) {\n const firstDescriptor = controller._pendingPullIntos.peek();\n const view = new Uint8Array(firstDescriptor.buffer,\n firstDescriptor.byteOffset + firstDescriptor.bytesFilled,\n firstDescriptor.byteLength - firstDescriptor.bytesFilled);\n\n const byobRequest: ReadableStreamBYOBRequest = Object.create(ReadableStreamBYOBRequest.prototype);\n SetUpReadableStreamBYOBRequest(byobRequest, controller, view);\n controller._byobRequest = byobRequest;\n }\n return controller._byobRequest;\n}\n\nfunction ReadableByteStreamControllerGetDesiredSize(controller: ReadableByteStreamController): number | null {\n const state = controller._controlledReadableByteStream._state;\n\n if (state === 'errored') {\n return null;\n }\n if (state === 'closed') {\n return 0;\n }\n\n return controller._strategyHWM - controller._queueTotalSize;\n}\n\nexport function ReadableByteStreamControllerRespond(controller: ReadableByteStreamController, bytesWritten: number) {\n assert(controller._pendingPullIntos.length > 0);\n\n const firstDescriptor = controller._pendingPullIntos.peek();\n const state = controller._controlledReadableByteStream._state;\n\n if (state === 'closed') {\n if (bytesWritten !== 0) {\n throw new TypeError('bytesWritten must be 0 when calling respond() on a closed stream');\n }\n } else {\n assert(state === 'readable');\n if (bytesWritten === 0) {\n throw new TypeError('bytesWritten must be greater than 0 when calling respond() on a readable stream');\n }\n if (firstDescriptor.bytesFilled + bytesWritten > firstDescriptor.byteLength) {\n throw new RangeError('bytesWritten out of range');\n }\n }\n\n firstDescriptor.buffer = TransferArrayBuffer(firstDescriptor.buffer);\n\n ReadableByteStreamControllerRespondInternal(controller, bytesWritten);\n}\n\nexport function ReadableByteStreamControllerRespondWithNewView(controller: ReadableByteStreamController,\n view: ArrayBufferView) {\n assert(controller._pendingPullIntos.length > 0);\n assert(!IsDetachedBuffer(view.buffer));\n\n const firstDescriptor = controller._pendingPullIntos.peek();\n const state = controller._controlledReadableByteStream._state;\n\n if (state === 'closed') {\n if (view.byteLength !== 0) {\n throw new TypeError('The view\\'s length must be 0 when calling respondWithNewView() on a closed stream');\n }\n } else {\n assert(state === 'readable');\n if (view.byteLength === 0) {\n throw new TypeError(\n 'The view\\'s length must be greater than 0 when calling respondWithNewView() on a readable stream'\n );\n }\n }\n\n if (firstDescriptor.byteOffset + firstDescriptor.bytesFilled !== view.byteOffset) {\n throw new RangeError('The region specified by view does not match byobRequest');\n }\n if (firstDescriptor.bufferByteLength !== view.buffer.byteLength) {\n throw new RangeError('The buffer of view has different capacity than byobRequest');\n }\n if (firstDescriptor.bytesFilled + view.byteLength > firstDescriptor.byteLength) {\n throw new RangeError('The region specified by view is larger than byobRequest');\n }\n\n const viewByteLength = view.byteLength;\n firstDescriptor.buffer = TransferArrayBuffer(view.buffer);\n ReadableByteStreamControllerRespondInternal(controller, viewByteLength);\n}\n\nexport function SetUpReadableByteStreamController(stream: ReadableByteStream,\n controller: ReadableByteStreamController,\n startAlgorithm: () => void | PromiseLike<void>,\n pullAlgorithm: () => Promise<void>,\n cancelAlgorithm: (reason: any) => Promise<void>,\n highWaterMark: number,\n autoAllocateChunkSize: number | undefined) {\n assert(stream._readableStreamController === undefined);\n if (autoAllocateChunkSize !== undefined) {\n assert(NumberIsInteger(autoAllocateChunkSize));\n assert(autoAllocateChunkSize > 0);\n }\n\n controller._controlledReadableByteStream = stream;\n\n controller._pullAgain = false;\n controller._pulling = false;\n\n controller._byobRequest = null;\n\n // Need to set the slots so that the assert doesn't fire. In the spec the slots already exist implicitly.\n controller._queue = controller._queueTotalSize = undefined!;\n ResetQueue(controller);\n\n controller._closeRequested = false;\n controller._started = false;\n\n controller._strategyHWM = highWaterMark;\n\n controller._pullAlgorithm = pullAlgorithm;\n controller._cancelAlgorithm = cancelAlgorithm;\n\n controller._autoAllocateChunkSize = autoAllocateChunkSize;\n\n controller._pendingPullIntos = new SimpleQueue();\n\n stream._readableStreamController = controller;\n\n const startResult = startAlgorithm();\n uponPromise(\n promiseResolvedWith(startResult),\n () => {\n controller._started = true;\n\n assert(!controller._pulling);\n assert(!controller._pullAgain);\n\n ReadableByteStreamControllerCallPullIfNeeded(controller);\n },\n r => {\n ReadableByteStreamControllerError(controller, r);\n }\n );\n}\n\nexport function SetUpReadableByteStreamControllerFromUnderlyingSource(\n stream: ReadableByteStream,\n underlyingByteSource: ValidatedUnderlyingByteSource,\n highWaterMark: number\n) {\n const controller: ReadableByteStreamController = Object.create(ReadableByteStreamController.prototype);\n\n let startAlgorithm: () => void | PromiseLike<void> = () => undefined;\n let pullAlgorithm: () => Promise<void> = () => promiseResolvedWith(undefined);\n let cancelAlgorithm: (reason: any) => Promise<void> = () => promiseResolvedWith(undefined);\n\n if (underlyingByteSource.start !== undefined) {\n startAlgorithm = () => underlyingByteSource.start!(controller);\n }\n if (underlyingByteSource.pull !== undefined) {\n pullAlgorithm = () => underlyingByteSource.pull!(controller);\n }\n if (underlyingByteSource.cancel !== undefined) {\n cancelAlgorithm = reason => underlyingByteSource.cancel!(reason);\n }\n\n const autoAllocateChunkSize = underlyingByteSource.autoAllocateChunkSize;\n if (autoAllocateChunkSize === 0) {\n throw new TypeError('autoAllocateChunkSize must be greater than 0');\n }\n\n SetUpReadableByteStreamController(\n stream, controller, startAlgorithm, pullAlgorithm, cancelAlgorithm, highWaterMark, autoAllocateChunkSize\n );\n}\n\nfunction SetUpReadableStreamBYOBRequest(request: ReadableStreamBYOBRequest,\n controller: ReadableByteStreamController,\n view: ArrayBufferView) {\n assert(IsReadableByteStreamController(controller));\n assert(typeof view === 'object');\n assert(ArrayBuffer.isView(view));\n assert(!IsDetachedBuffer(view.buffer));\n request._associatedReadableByteStreamController = controller;\n request._view = view;\n}\n\n// Helper functions for the ReadableStreamBYOBRequest.\n\nfunction byobRequestBrandCheckException(name: string): TypeError {\n return new TypeError(\n `ReadableStreamBYOBRequest.prototype.${name} can only be used on a ReadableStreamBYOBRequest`);\n}\n\n// Helper functions for the ReadableByteStreamController.\n\nfunction byteStreamControllerBrandCheckException(name: string): TypeError {\n return new TypeError(\n `ReadableByteStreamController.prototype.${name} can only be used on a ReadableByteStreamController`);\n}\n","import assert from '../../stub/assert';\nimport { SimpleQueue } from '../simple-queue';\nimport {\n ReadableStreamReaderGenericCancel,\n ReadableStreamReaderGenericInitialize,\n ReadableStreamReaderGenericRelease,\n readerLockException\n} from './generic-reader';\nimport { IsReadableStreamLocked, ReadableByteStream, ReadableStream } from '../readable-stream';\nimport {\n IsReadableByteStreamController,\n ReadableByteStreamController,\n ReadableByteStreamControllerPullInto\n} from './byte-stream-controller';\nimport { typeIsObject } from '../helpers/miscellaneous';\nimport { newPromise, promiseRejectedWith } from '../helpers/webidl';\nimport { assertRequiredArgument } from '../validators/basic';\nimport { assertReadableStream } from '../validators/readable-stream';\nimport { IsDetachedBuffer } from '../abstract-ops/ecmascript';\n\n/**\n * A result returned by {@link ReadableStreamBYOBReader.read}.\n *\n * @public\n */\nexport type ReadableStreamBYOBReadResult<T extends ArrayBufferView> = {\n done: false;\n value: T;\n} | {\n done: true;\n value: T | undefined;\n};\n\n// Abstract operations for the ReadableStream.\n\nexport function AcquireReadableStreamBYOBReader(stream: ReadableByteStream): ReadableStreamBYOBReader {\n return new ReadableStreamBYOBReader(stream);\n}\n\n// ReadableStream API exposed for controllers.\n\nexport function ReadableStreamAddReadIntoRequest<T extends ArrayBufferView>(stream: ReadableByteStream,\n readIntoRequest: ReadIntoRequest<T>): void {\n assert(IsReadableStreamBYOBReader(stream._reader));\n assert(stream._state === 'readable' || stream._state === 'closed');\n\n (stream._reader! as ReadableStreamBYOBReader)._readIntoRequests.push(readIntoRequest);\n}\n\nexport function ReadableStreamFulfillReadIntoRequest(stream: ReadableByteStream,\n chunk: ArrayBufferView,\n done: boolean) {\n const reader = stream._reader as ReadableStreamBYOBReader;\n\n assert(reader._readIntoRequests.length > 0);\n\n const readIntoRequest = reader._readIntoRequests.shift()!;\n if (done) {\n readIntoRequest._closeSteps(chunk);\n } else {\n readIntoRequest._chunkSteps(chunk);\n }\n}\n\nexport function ReadableStreamGetNumReadIntoRequests(stream: ReadableByteStream): number {\n return (stream._reader as ReadableStreamBYOBReader)._readIntoRequests.length;\n}\n\nexport function ReadableStreamHasBYOBReader(stream: ReadableByteStream): boolean {\n const reader = stream._reader;\n\n if (reader === undefined) {\n return false;\n }\n\n if (!IsReadableStreamBYOBReader(reader)) {\n return false;\n }\n\n return true;\n}\n\n// Readers\n\nexport interface ReadIntoRequest<T extends ArrayBufferView> {\n _chunkSteps(chunk: T): void;\n\n _closeSteps(chunk: T | undefined): void;\n\n _errorSteps(e: any): void;\n}\n\n/**\n * A BYOB reader vended by a {@link ReadableStream}.\n *\n * @public\n */\nexport class ReadableStreamBYOBReader {\n /** @internal */\n _ownerReadableStream!: ReadableByteStream;\n /** @internal */\n _closedPromise!: Promise<undefined>;\n /** @internal */\n _closedPromise_resolve?: (value?: undefined) => void;\n /** @internal */\n _closedPromise_reject?: (reason: any) => void;\n /** @internal */\n _readIntoRequests: SimpleQueue<ReadIntoRequest<any>>;\n\n constructor(stream: ReadableByteStream) {\n assertRequiredArgument(stream, 1, 'ReadableStreamBYOBReader');\n assertReadableStream(stream, 'First parameter');\n\n if (IsReadableStreamLocked(stream)) {\n throw new TypeError('This stream has already been locked for exclusive reading by another reader');\n }\n\n if (!IsReadableByteStreamController(stream._readableStreamController)) {\n throw new TypeError('Cannot construct a ReadableStreamBYOBReader for a stream not constructed with a byte ' +\n 'source');\n }\n\n ReadableStreamReaderGenericInitialize(this, stream);\n\n this._readIntoRequests = new SimpleQueue();\n }\n\n /**\n * Returns a promise that will be fulfilled when the stream becomes closed, or rejected if the stream ever errors or\n * the reader's lock is released before the stream finishes closing.\n */\n get closed(): Promise<undefined> {\n if (!IsReadableStreamBYOBReader(this)) {\n return promiseRejectedWith(byobReaderBrandCheckException('closed'));\n }\n\n return this._closedPromise;\n }\n\n /**\n * If the reader is active, behaves the same as {@link ReadableStream.cancel | stream.cancel(reason)}.\n */\n cancel(reason: any = undefined): Promise<void> {\n if (!IsReadableStreamBYOBReader(this)) {\n return promiseRejectedWith(byobReaderBrandCheckException('cancel'));\n }\n\n if (this._ownerReadableStream === undefined) {\n return promiseRejectedWith(readerLockException('cancel'));\n }\n\n return ReadableStreamReaderGenericCancel(this, reason);\n }\n\n /**\n * Attempts to reads bytes into view, and returns a promise resolved with the result.\n *\n * If reading a chunk causes the queue to become empty, more data will be pulled from the underlying source.\n */\n read<T extends ArrayBufferView>(view: T): Promise<ReadableStreamBYOBReadResult<T>> {\n if (!IsReadableStreamBYOBReader(this)) {\n return promiseRejectedWith(byobReaderBrandCheckException('read'));\n }\n\n if (!ArrayBuffer.isView(view)) {\n return promiseRejectedWith(new TypeError('view must be an array buffer view'));\n }\n if (view.byteLength === 0) {\n return promiseRejectedWith(new TypeError('view must have non-zero byteLength'));\n }\n if (view.buffer.byteLength === 0) {\n return promiseRejectedWith(new TypeError(`view's buffer must have non-zero byteLength`));\n }\n if (IsDetachedBuffer(view.buffer)) {\n return promiseRejectedWith(new TypeError('view\\'s buffer has been detached'));\n }\n\n if (this._ownerReadableStream === undefined) {\n return promiseRejectedWith(readerLockException('read from'));\n }\n\n let resolvePromise!: (result: ReadableStreamBYOBReadResult<T>) => void;\n let rejectPromise!: (reason: any) => void;\n const promise = newPromise<ReadableStreamBYOBReadResult<T>>((resolve, reject) => {\n resolvePromise = resolve;\n rejectPromise = reject;\n });\n const readIntoRequest: ReadIntoRequest<T> = {\n _chunkSteps: chunk => resolvePromise({ value: chunk, done: false }),\n _closeSteps: chunk => resolvePromise({ value: chunk, done: true }),\n _errorSteps: e => rejectPromise(e)\n };\n ReadableStreamBYOBReaderRead(this, view, readIntoRequest);\n return promise;\n }\n\n /**\n * Releases the reader's lock on the corresponding stream. After the lock is released, the reader is no longer active.\n * If the associated stream is errored when the lock is released, the reader will appear errored in the same way\n * from now on; otherwise, the reader will appear closed.\n *\n * A reader's lock cannot be released while it still has a pending read request, i.e., if a promise returned by\n * the reader's {@link ReadableStreamBYOBReader.read | read()} method has not yet been settled. Attempting to\n * do so will throw a `TypeError` and leave the reader locked to the stream.\n */\n releaseLock(): void {\n if (!IsReadableStreamBYOBReader(this)) {\n throw byobReaderBrandCheckException('releaseLock');\n }\n\n if (this._ownerReadableStream === undefined) {\n return;\n }\n\n if (this._readIntoRequests.length > 0) {\n throw new TypeError('Tried to release a reader lock when that reader has pending read() calls un-settled');\n }\n\n ReadableStreamReaderGenericRelease(this);\n }\n}\n\nObject.defineProperties(ReadableStreamBYOBReader.prototype, {\n cancel: { enumerable: true },\n read: { enumerable: true },\n releaseLock: { enumerable: true },\n closed: { enumerable: true }\n});\nif (typeof Symbol.toStringTag === 'symbol') {\n Object.defineProperty(ReadableStreamBYOBReader.prototype, Symbol.toStringTag, {\n value: 'ReadableStreamBYOBReader',\n configurable: true\n });\n}\n\n// Abstract operations for the readers.\n\nexport function IsReadableStreamBYOBReader(x: any): x is ReadableStreamBYOBReader {\n if (!typeIsObject(x)) {\n return false;\n }\n\n if (!Object.prototype.hasOwnProperty.call(x, '_readIntoRequests')) {\n return false;\n }\n\n return x instanceof ReadableStreamBYOBReader;\n}\n\nexport function ReadableStreamBYOBReaderRead<T extends ArrayBufferView>(\n reader: ReadableStreamBYOBReader,\n view: T,\n readIntoRequest: ReadIntoRequest<T>\n): void {\n const stream = reader._ownerReadableStream;\n\n assert(stream !== undefined);\n\n stream._disturbed = true;\n\n if (stream._state === 'errored') {\n readIntoRequest._errorSteps(stream._storedError);\n } else {\n ReadableByteStreamControllerPullInto(\n stream._readableStreamController as ReadableByteStreamController,\n view,\n readIntoRequest\n );\n }\n}\n\n// Helper functions for the ReadableStreamBYOBReader.\n\nfunction byobReaderBrandCheckException(name: string): TypeError {\n return new TypeError(\n `ReadableStreamBYOBReader.prototype.${name} can only be used on a ReadableStreamBYOBReader`);\n}\n","import { QueuingStrategy, QueuingStrategySizeCallback } from '../queuing-strategy';\nimport NumberIsNaN from '../../stub/number-isnan';\n\nexport function ExtractHighWaterMark(strategy: QueuingStrategy, defaultHWM: number): number {\n const { highWaterMark } = strategy;\n\n if (highWaterMark === undefined) {\n return defaultHWM;\n }\n\n if (NumberIsNaN(highWaterMark) || highWaterMark < 0) {\n throw new RangeError('Invalid highWaterMark');\n }\n\n return highWaterMark;\n}\n\nexport function ExtractSizeAlgorithm<T>(strategy: QueuingStrategy<T>): QueuingStrategySizeCallback<T> {\n const { size } = strategy;\n\n if (!size) {\n return () => 1;\n }\n\n return size;\n}\n","import { QueuingStrategy, QueuingStrategySizeCallback } from '../queuing-strategy';\nimport { assertDictionary, assertFunction, convertUnrestrictedDouble } from './basic';\n\nexport function convertQueuingStrategy<T>(init: QueuingStrategy<T> | null | undefined,\n context: string): QueuingStrategy<T> {\n assertDictionary(init, context);\n const highWaterMark = init?.highWaterMark;\n const size = init?.size;\n return {\n highWaterMark: highWaterMark === undefined ? undefined : convertUnrestrictedDouble(highWaterMark),\n size: size === undefined ? undefined : convertQueuingStrategySize(size, `${context} has member 'size' that`)\n };\n}\n\nfunction convertQueuingStrategySize<T>(fn: QueuingStrategySizeCallback<T>,\n context: string): QueuingStrategySizeCallback<T> {\n assertFunction(fn, context);\n return chunk => convertUnrestrictedDouble(fn(chunk));\n}\n","import { assertDictionary, assertFunction } from './basic';\nimport { promiseCall, reflectCall } from '../helpers/webidl';\nimport {\n UnderlyingSink,\n UnderlyingSinkAbortCallback,\n UnderlyingSinkCloseCallback,\n UnderlyingSinkStartCallback,\n UnderlyingSinkWriteCallback,\n ValidatedUnderlyingSink\n} from '../writable-stream/underlying-sink';\nimport { WritableStreamDefaultController } from '../writable-stream';\n\nexport function convertUnderlyingSink<W>(original: UnderlyingSink<W> | null,\n context: string): ValidatedUnderlyingSink<W> {\n assertDictionary(original, context);\n const abort = original?.abort;\n const close = original?.close;\n const start = original?.start;\n const type = original?.type;\n const write = original?.write;\n return {\n abort: abort === undefined ?\n undefined :\n convertUnderlyingSinkAbortCallback(abort, original!, `${context} has member 'abort' that`),\n close: close === undefined ?\n undefined :\n convertUnderlyingSinkCloseCallback(close, original!, `${context} has member 'close' that`),\n start: start === undefined ?\n undefined :\n convertUnderlyingSinkStartCallback(start, original!, `${context} has member 'start' that`),\n write: write === undefined ?\n undefined :\n convertUnderlyingSinkWriteCallback(write, original!, `${context} has member 'write' that`),\n type\n };\n}\n\nfunction convertUnderlyingSinkAbortCallback(\n fn: UnderlyingSinkAbortCallback,\n original: UnderlyingSink,\n context: string\n): (reason: any) => Promise<void> {\n assertFunction(fn, context);\n return (reason: any) => promiseCall(fn, original, [reason]);\n}\n\nfunction convertUnderlyingSinkCloseCallback(\n fn: UnderlyingSinkCloseCallback,\n original: UnderlyingSink,\n context: string\n): () => Promise<void> {\n assertFunction(fn, context);\n return () => promiseCall(fn, original, []);\n}\n\nfunction convertUnderlyingSinkStartCallback(\n fn: UnderlyingSinkStartCallback,\n original: UnderlyingSink,\n context: string\n): UnderlyingSinkStartCallback {\n assertFunction(fn, context);\n return (controller: WritableStreamDefaultController) => reflectCall(fn, original, [controller]);\n}\n\nfunction convertUnderlyingSinkWriteCallback<W>(\n fn: UnderlyingSinkWriteCallback<W>,\n original: UnderlyingSink<W>,\n context: string\n): (chunk: W, controller: WritableStreamDefaultController) => Promise<void> {\n assertFunction(fn, context);\n return (chunk: W, controller: WritableStreamDefaultController) => promiseCall(fn, original, [chunk, controller]);\n}\n","import { IsWritableStream, WritableStream } from '../writable-stream';\n\nexport function assertWritableStream(x: unknown, context: string): asserts x is WritableStream {\n if (!IsWritableStream(x)) {\n throw new TypeError(`${context} is not a WritableStream.`);\n }\n}\n","/**\n * A signal object that allows you to communicate with a request and abort it if required\n * via its associated `AbortController` object.\n *\n * @remarks\n * This interface is compatible with the `AbortSignal` interface defined in TypeScript's DOM types.\n * It is redefined here, so it can be polyfilled without a DOM, for example with\n * {@link https://www.npmjs.com/package/abortcontroller-polyfill | abortcontroller-polyfill} in a Node environment.\n *\n * @public\n */\nexport interface AbortSignal {\n /**\n * Whether the request is aborted.\n */\n readonly aborted: boolean;\n\n /**\n * Add an event listener to be triggered when this signal becomes aborted.\n */\n addEventListener(type: 'abort', listener: () => void): void;\n\n /**\n * Remove an event listener that was previously added with {@link AbortSignal.addEventListener}.\n */\n removeEventListener(type: 'abort', listener: () => void): void;\n}\n\nexport function isAbortSignal(value: unknown): value is AbortSignal {\n if (typeof value !== 'object' || value === null) {\n return false;\n }\n try {\n return typeof (value as AbortSignal).aborted === 'boolean';\n } catch {\n // AbortSignal.prototype.aborted throws if its brand check fails\n return false;\n }\n}\n\n/**\n * A controller object that allows you to abort an `AbortSignal` when desired.\n *\n * @remarks\n * This interface is compatible with the `AbortController` interface defined in TypeScript's DOM types.\n * It is redefined here, so it can be polyfilled without a DOM, for example with\n * {@link https://www.npmjs.com/package/abortcontroller-polyfill | abortcontroller-polyfill} in a Node environment.\n *\n * @internal\n */\nexport interface AbortController {\n readonly signal: AbortSignal;\n\n abort(): void;\n}\n\ninterface AbortControllerConstructor {\n new(): AbortController;\n}\n\nconst supportsAbortController = typeof (AbortController as any) === 'function';\n\n/**\n * Construct a new AbortController, if supported by the platform.\n *\n * @internal\n */\nexport function createAbortController(): AbortController | undefined {\n if (supportsAbortController) {\n return new (AbortController as AbortControllerConstructor)();\n }\n return undefined;\n}\n","import assert from '../stub/assert';\nimport {\n newPromise,\n promiseRejectedWith,\n promiseResolvedWith,\n setPromiseIsHandledToTrue,\n uponPromise\n} from './helpers/webidl';\nimport {\n DequeueValue,\n EnqueueValueWithSize,\n PeekQueueValue,\n QueuePair,\n ResetQueue\n} from './abstract-ops/queue-with-sizes';\nimport { QueuingStrategy, QueuingStrategySizeCallback } from './queuing-strategy';\nimport { SimpleQueue } from './simple-queue';\nimport { typeIsObject } from './helpers/miscellaneous';\nimport { AbortSteps, ErrorSteps } from './abstract-ops/internal-methods';\nimport { IsNonNegativeNumber } from './abstract-ops/miscellaneous';\nimport { ExtractHighWaterMark, ExtractSizeAlgorithm } from './abstract-ops/queuing-strategy';\nimport { convertQueuingStrategy } from './validators/queuing-strategy';\nimport {\n UnderlyingSink,\n UnderlyingSinkAbortCallback,\n UnderlyingSinkCloseCallback,\n UnderlyingSinkStartCallback,\n UnderlyingSinkWriteCallback,\n ValidatedUnderlyingSink\n} from './writable-stream/underlying-sink';\nimport { assertObject, assertRequiredArgument } from './validators/basic';\nimport { convertUnderlyingSink } from './validators/underlying-sink';\nimport { assertWritableStream } from './validators/writable-stream';\nimport { AbortController, AbortSignal, createAbortController } from './abort-signal';\n\ntype WritableStreamState = 'writable' | 'closed' | 'erroring' | 'errored';\n\ninterface WriteOrCloseRequest {\n _resolve: (value?: undefined) => void;\n _reject: (reason: any) => void;\n}\n\ntype WriteRequest = WriteOrCloseRequest;\ntype CloseRequest = WriteOrCloseRequest;\n\ninterface PendingAbortRequest {\n _promise: Promise<undefined>;\n _resolve: (value?: undefined) => void;\n _reject: (reason: any) => void;\n _reason: any;\n _wasAlreadyErroring: boolean;\n}\n\n/**\n * A writable stream represents a destination for data, into which you can write.\n *\n * @public\n */\nclass WritableStream<W = any> {\n /** @internal */\n _state!: WritableStreamState;\n /** @internal */\n _storedError: any;\n /** @internal */\n _writer: WritableStreamDefaultWriter<W> | undefined;\n /** @internal */\n _writableStreamController!: WritableStreamDefaultController<W>;\n /** @internal */\n _writeRequests!: SimpleQueue<WriteRequest>;\n /** @internal */\n _inFlightWriteRequest: WriteRequest | undefined;\n /** @internal */\n _closeRequest: CloseRequest | undefined;\n /** @internal */\n _inFlightCloseRequest: CloseRequest | undefined;\n /** @internal */\n _pendingAbortRequest: PendingAbortRequest | undefined;\n /** @internal */\n _backpressure!: boolean;\n\n constructor(underlyingSink?: UnderlyingSink<W>, strategy?: QueuingStrategy<W>);\n constructor(rawUnderlyingSink: UnderlyingSink<W> | null | undefined = {},\n rawStrategy: QueuingStrategy<W> | null | undefined = {}) {\n if (rawUnderlyingSink === undefined) {\n rawUnderlyingSink = null;\n } else {\n assertObject(rawUnderlyingSink, 'First parameter');\n }\n\n const strategy = convertQueuingStrategy(rawStrategy, 'Second parameter');\n const underlyingSink = convertUnderlyingSink(rawUnderlyingSink, 'First parameter');\n\n InitializeWritableStream(this);\n\n const type = underlyingSink.type;\n if (type !== undefined) {\n throw new RangeError('Invalid type is specified');\n }\n\n const sizeAlgorithm = ExtractSizeAlgorithm(strategy);\n const highWaterMark = ExtractHighWaterMark(strategy, 1);\n\n SetUpWritableStreamDefaultControllerFromUnderlyingSink(this, underlyingSink, highWaterMark, sizeAlgorithm);\n }\n\n /**\n * Returns whether or not the writable stream is locked to a writer.\n */\n get locked(): boolean {\n if (!IsWritableStream(this)) {\n throw streamBrandCheckException('locked');\n }\n\n return IsWritableStreamLocked(this);\n }\n\n /**\n * Aborts the stream, signaling that the producer can no longer successfully write to the stream and it is to be\n * immediately moved to an errored state, with any queued-up writes discarded. This will also execute any abort\n * mechanism of the underlying sink.\n *\n * The returned promise will fulfill if the stream shuts down successfully, or reject if the underlying sink signaled\n * that there was an error doing so. Additionally, it will reject with a `TypeError` (without attempting to cancel\n * the stream) if the stream is currently locked.\n */\n abort(reason: any = undefined): Promise<void> {\n if (!IsWritableStream(this)) {\n return promiseRejectedWith(streamBrandCheckException('abort'));\n }\n\n if (IsWritableStreamLocked(this)) {\n return promiseRejectedWith(new TypeError('Cannot abort a stream that already has a writer'));\n }\n\n return WritableStreamAbort(this, reason);\n }\n\n /**\n * Closes the stream. The underlying sink will finish processing any previously-written chunks, before invoking its\n * close behavior. During this time any further attempts to write will fail (without erroring the stream).\n *\n * The method returns a promise that will fulfill if all remaining chunks are successfully written and the stream\n * successfully closes, or rejects if an error is encountered during this process. Additionally, it will reject with\n * a `TypeError` (without attempting to cancel the stream) if the stream is currently locked.\n */\n close() {\n if (!IsWritableStream(this)) {\n return promiseRejectedWith(streamBrandCheckException('close'));\n }\n\n if (IsWritableStreamLocked(this)) {\n return promiseRejectedWith(new TypeError('Cannot close a stream that already has a writer'));\n }\n\n if (WritableStreamCloseQueuedOrInFlight(this)) {\n return promiseRejectedWith(new TypeError('Cannot close an already-closing stream'));\n }\n\n return WritableStreamClose(this);\n }\n\n /**\n * Creates a {@link WritableStreamDefaultWriter | writer} and locks the stream to the new writer. While the stream\n * is locked, no other writer can be acquired until this one is released.\n *\n * This functionality is especially useful for creating abstractions that desire the ability to write to a stream\n * without interruption or interleaving. By getting a writer for the stream, you can ensure nobody else can write at\n * the same time, which would cause the resulting written data to be unpredictable and probably useless.\n */\n getWriter(): WritableStreamDefaultWriter<W> {\n if (!IsWritableStream(this)) {\n throw streamBrandCheckException('getWriter');\n }\n\n return AcquireWritableStreamDefaultWriter(this);\n }\n}\n\nObject.defineProperties(WritableStream.prototype, {\n abort: { enumerable: true },\n close: { enumerable: true },\n getWriter: { enumerable: true },\n locked: { enumerable: true }\n});\nif (typeof Symbol.toStringTag === 'symbol') {\n Object.defineProperty(WritableStream.prototype, Symbol.toStringTag, {\n value: 'WritableStream',\n configurable: true\n });\n}\n\nexport {\n AcquireWritableStreamDefaultWriter,\n CreateWritableStream,\n IsWritableStream,\n IsWritableStreamLocked,\n WritableStream,\n WritableStreamAbort,\n WritableStreamDefaultControllerErrorIfNeeded,\n WritableStreamDefaultWriterCloseWithErrorPropagation,\n WritableStreamDefaultWriterRelease,\n WritableStreamDefaultWriterWrite,\n WritableStreamCloseQueuedOrInFlight,\n UnderlyingSink,\n UnderlyingSinkStartCallback,\n UnderlyingSinkWriteCallback,\n UnderlyingSinkCloseCallback,\n UnderlyingSinkAbortCallback\n};\n\n// Abstract operations for the WritableStream.\n\nfunction AcquireWritableStreamDefaultWriter<W>(stream: WritableStream<W>): WritableStreamDefaultWriter<W> {\n return new WritableStreamDefaultWriter(stream);\n}\n\n// Throws if and only if startAlgorithm throws.\nfunction CreateWritableStream<W>(startAlgorithm: () => void | PromiseLike<void>,\n writeAlgorithm: (chunk: W) => Promise<void>,\n closeAlgorithm: () => Promise<void>,\n abortAlgorithm: (reason: any) => Promise<void>,\n highWaterMark = 1,\n sizeAlgorithm: QueuingStrategySizeCallback<W> = () => 1) {\n assert(IsNonNegativeNumber(highWaterMark));\n\n const stream: WritableStream<W> = Object.create(WritableStream.prototype);\n InitializeWritableStream(stream);\n\n const controller: WritableStreamDefaultController<W> = Object.create(WritableStreamDefaultController.prototype);\n\n SetUpWritableStreamDefaultController(stream, controller, startAlgorithm, writeAlgorithm, closeAlgorithm,\n abortAlgorithm, highWaterMark, sizeAlgorithm);\n return stream;\n}\n\nfunction InitializeWritableStream<W>(stream: WritableStream<W>) {\n stream._state = 'writable';\n\n // The error that will be reported by new method calls once the state becomes errored. Only set when [[state]] is\n // 'erroring' or 'errored'. May be set to an undefined value.\n stream._storedError = undefined;\n\n stream._writer = undefined;\n\n // Initialize to undefined first because the constructor of the controller checks this\n // variable to validate the caller.\n stream._writableStreamController = undefined!;\n\n // This queue is placed here instead of the writer class in order to allow for passing a writer to the next data\n // producer without waiting for the queued writes to finish.\n stream._writeRequests = new SimpleQueue();\n\n // Write requests are removed from _writeRequests when write() is called on the underlying sink. This prevents\n // them from being erroneously rejected on error. If a write() call is in-flight, the request is stored here.\n stream._inFlightWriteRequest = undefined;\n\n // The promise that was returned from writer.close(). Stored here because it may be fulfilled after the writer\n // has been detached.\n stream._closeRequest = undefined;\n\n // Close request is removed from _closeRequest when close() is called on the underlying sink. This prevents it\n // from being erroneously rejected on error. If a close() call is in-flight, the request is stored here.\n stream._inFlightCloseRequest = undefined;\n\n // The promise that was returned from writer.abort(). This may also be fulfilled after the writer has detached.\n stream._pendingAbortRequest = undefined;\n\n // The backpressure signal set by the controller.\n stream._backpressure = false;\n}\n\nfunction IsWritableStream(x: unknown): x is WritableStream {\n if (!typeIsObject(x)) {\n return false;\n }\n\n if (!Object.prototype.hasOwnProperty.call(x, '_writableStreamController')) {\n return false;\n }\n\n return x instanceof WritableStream;\n}\n\nfunction IsWritableStreamLocked(stream: WritableStream): boolean {\n assert(IsWritableStream(stream));\n\n if (stream._writer === undefined) {\n return false;\n }\n\n return true;\n}\n\nfunction WritableStreamAbort(stream: WritableStream, reason: any): Promise<undefined> {\n if (stream._state === 'closed' || stream._state === 'errored') {\n return promiseResolvedWith(undefined);\n }\n stream._writableStreamController._abortReason = reason;\n stream._writableStreamController._abortController?.abort();\n\n // TypeScript narrows the type of `stream._state` down to 'writable' | 'erroring',\n // but it doesn't know that signaling abort runs author code that might have changed the state.\n // Widen the type again by casting to WritableStreamState.\n const state = stream._state as WritableStreamState;\n\n if (state === 'closed' || state === 'errored') {\n return promiseResolvedWith(undefined);\n }\n if (stream._pendingAbortRequest !== undefined) {\n return stream._pendingAbortRequest._promise;\n }\n\n assert(state === 'writable' || state === 'erroring');\n\n let wasAlreadyErroring = false;\n if (state === 'erroring') {\n wasAlreadyErroring = true;\n // reason will not be used, so don't keep a reference to it.\n reason = undefined;\n }\n\n const promise = newPromise<undefined>((resolve, reject) => {\n stream._pendingAbortRequest = {\n _promise: undefined!,\n _resolve: resolve,\n _reject: reject,\n _reason: reason,\n _wasAlreadyErroring: wasAlreadyErroring\n };\n });\n stream._pendingAbortRequest!._promise = promise;\n\n if (!wasAlreadyErroring) {\n WritableStreamStartErroring(stream, reason);\n }\n\n return promise;\n}\n\nfunction WritableStreamClose(stream: WritableStream<any>): Promise<undefined> {\n const state = stream._state;\n if (state === 'closed' || state === 'errored') {\n return promiseRejectedWith(new TypeError(\n `The stream (in ${state} state) is not in the writable state and cannot be closed`));\n }\n\n assert(state === 'writable' || state === 'erroring');\n assert(!WritableStreamCloseQueuedOrInFlight(stream));\n\n const promise = newPromise<undefined>((resolve, reject) => {\n const closeRequest: CloseRequest = {\n _resolve: resolve,\n _reject: reject\n };\n\n stream._closeRequest = closeRequest;\n });\n\n const writer = stream._writer;\n if (writer !== undefined && stream._backpressure && state === 'writable') {\n defaultWriterReadyPromiseResolve(writer);\n }\n\n WritableStreamDefaultControllerClose(stream._writableStreamController);\n\n return promise;\n}\n\n// WritableStream API exposed for controllers.\n\nfunction WritableStreamAddWriteRequest(stream: WritableStream): Promise<undefined> {\n assert(IsWritableStreamLocked(stream));\n assert(stream._state === 'writable');\n\n const promise = newPromise<undefined>((resolve, reject) => {\n const writeRequest: WriteRequest = {\n _resolve: resolve,\n _reject: reject\n };\n\n stream._writeRequests.push(writeRequest);\n });\n\n return promise;\n}\n\nfunction WritableStreamDealWithRejection(stream: WritableStream, error: any) {\n const state = stream._state;\n\n if (state === 'writable') {\n WritableStreamStartErroring(stream, error);\n return;\n }\n\n assert(state === 'erroring');\n WritableStreamFinishErroring(stream);\n}\n\nfunction WritableStreamStartErroring(stream: WritableStream, reason: any) {\n assert(stream._storedError === undefined);\n assert(stream._state === 'writable');\n\n const controller = stream._writableStreamController;\n assert(controller !== undefined);\n\n stream._state = 'erroring';\n stream._storedError = reason;\n const writer = stream._writer;\n if (writer !== undefined) {\n WritableStreamDefaultWriterEnsureReadyPromiseRejected(writer, reason);\n }\n\n if (!WritableStreamHasOperationMarkedInFlight(stream) && controller._started) {\n WritableStreamFinishErroring(stream);\n }\n}\n\nfunction WritableStreamFinishErroring(stream: WritableStream) {\n assert(stream._state === 'erroring');\n assert(!WritableStreamHasOperationMarkedInFlight(stream));\n stream._state = 'errored';\n stream._writableStreamController[ErrorSteps]();\n\n const storedError = stream._storedError;\n stream._writeRequests.forEach(writeRequest => {\n writeRequest._reject(storedError);\n });\n stream._writeRequests = new SimpleQueue();\n\n if (stream._pendingAbortRequest === undefined) {\n WritableStreamRejectCloseAndClosedPromiseIfNeeded(stream);\n return;\n }\n\n const abortRequest = stream._pendingAbortRequest;\n stream._pendingAbortRequest = undefined;\n\n if (abortRequest._wasAlreadyErroring) {\n abortRequest._reject(storedError);\n WritableStreamRejectCloseAndClosedPromiseIfNeeded(stream);\n return;\n }\n\n const promise = stream._writableStreamController[AbortSteps](abortRequest._reason);\n uponPromise(\n promise,\n () => {\n abortRequest._resolve();\n WritableStreamRejectCloseAndClosedPromiseIfNeeded(stream);\n },\n (reason: any) => {\n abortRequest._reject(reason);\n WritableStreamRejectCloseAndClosedPromiseIfNeeded(stream);\n });\n}\n\nfunction WritableStreamFinishInFlightWrite(stream: WritableStream) {\n assert(stream._inFlightWriteRequest !== undefined);\n stream._inFlightWriteRequest!._resolve(undefined);\n stream._inFlightWriteRequest = undefined;\n}\n\nfunction WritableStreamFinishInFlightWriteWithError(stream: WritableStream, error: any) {\n assert(stream._inFlightWriteRequest !== undefined);\n stream._inFlightWriteRequest!._reject(error);\n stream._inFlightWriteRequest = undefined;\n\n assert(stream._state === 'writable' || stream._state === 'erroring');\n\n WritableStreamDealWithRejection(stream, error);\n}\n\nfunction WritableStreamFinishInFlightClose(stream: WritableStream) {\n assert(stream._inFlightCloseRequest !== undefined);\n stream._inFlightCloseRequest!._resolve(undefined);\n stream._inFlightCloseRequest = undefined;\n\n const state = stream._state;\n\n assert(state === 'writable' || state === 'erroring');\n\n if (state === 'erroring') {\n // The error was too late to do anything, so it is ignored.\n stream._storedError = undefined;\n if (stream._pendingAbortRequest !== undefined) {\n stream._pendingAbortRequest._resolve();\n stream._pendingAbortRequest = undefined;\n }\n }\n\n stream._state = 'closed';\n\n const writer = stream._writer;\n if (writer !== undefined) {\n defaultWriterClosedPromiseResolve(writer);\n }\n\n assert(stream._pendingAbortRequest === undefined);\n assert(stream._storedError === undefined);\n}\n\nfunction WritableStreamFinishInFlightCloseWithError(stream: WritableStream, error: any) {\n assert(stream._inFlightCloseRequest !== undefined);\n stream._inFlightCloseRequest!._reject(error);\n stream._inFlightCloseRequest = undefined;\n\n assert(stream._state === 'writable' || stream._state === 'erroring');\n\n // Never execute sink abort() after sink close().\n if (stream._pendingAbortRequest !== undefined) {\n stream._pendingAbortRequest._reject(error);\n stream._pendingAbortRequest = undefined;\n }\n WritableStreamDealWithRejection(stream, error);\n}\n\n// TODO(ricea): Fix alphabetical order.\nfunction WritableStreamCloseQueuedOrInFlight(stream: WritableStream): boolean {\n if (stream._closeRequest === undefined && stream._inFlightCloseRequest === undefined) {\n return false;\n }\n\n return true;\n}\n\nfunction WritableStreamHasOperationMarkedInFlight(stream: WritableStream): boolean {\n if (stream._inFlightWriteRequest === undefined && stream._inFlightCloseRequest === undefined) {\n return false;\n }\n\n return true;\n}\n\nfunction WritableStreamMarkCloseRequestInFlight(stream: WritableStream) {\n assert(stream._inFlightCloseRequest === undefined);\n assert(stream._closeRequest !== undefined);\n stream._inFlightCloseRequest = stream._closeRequest;\n stream._closeRequest = undefined;\n}\n\nfunction WritableStreamMarkFirstWriteRequestInFlight(stream: WritableStream) {\n assert(stream._inFlightWriteRequest === undefined);\n assert(stream._writeRequests.length !== 0);\n stream._inFlightWriteRequest = stream._writeRequests.shift();\n}\n\nfunction WritableStreamRejectCloseAndClosedPromiseIfNeeded(stream: WritableStream) {\n assert(stream._state === 'errored');\n if (stream._closeRequest !== undefined) {\n assert(stream._inFlightCloseRequest === undefined);\n\n stream._closeRequest._reject(stream._storedError);\n stream._closeRequest = undefined;\n }\n const writer = stream._writer;\n if (writer !== undefined) {\n defaultWriterClosedPromiseReject(writer, stream._storedError);\n }\n}\n\nfunction WritableStreamUpdateBackpressure(stream: WritableStream, backpressure: boolean) {\n assert(stream._state === 'writable');\n assert(!WritableStreamCloseQueuedOrInFlight(stream));\n\n const writer = stream._writer;\n if (writer !== undefined && backpressure !== stream._backpressure) {\n if (backpressure) {\n defaultWriterReadyPromiseReset(writer);\n } else {\n assert(!backpressure);\n\n defaultWriterReadyPromiseResolve(writer);\n }\n }\n\n stream._backpressure = backpressure;\n}\n\n/**\n * A default writer vended by a {@link WritableStream}.\n *\n * @public\n */\nexport class WritableStreamDefaultWriter<W = any> {\n /** @internal */\n _ownerWritableStream: WritableStream<W>;\n /** @internal */\n _closedPromise!: Promise<undefined>;\n /** @internal */\n _closedPromise_resolve?: (value?: undefined) => void;\n /** @internal */\n _closedPromise_reject?: (reason: any) => void;\n /** @internal */\n _closedPromiseState!: 'pending' | 'resolved' | 'rejected';\n /** @internal */\n _readyPromise!: Promise<undefined>;\n /** @internal */\n _readyPromise_resolve?: (value?: undefined) => void;\n /** @internal */\n _readyPromise_reject?: (reason: any) => void;\n /** @internal */\n _readyPromiseState!: 'pending' | 'fulfilled' | 'rejected';\n\n constructor(stream: WritableStream<W>) {\n assertRequiredArgument(stream, 1, 'WritableStreamDefaultWriter');\n assertWritableStream(stream, 'First parameter');\n\n if (IsWritableStreamLocked(stream)) {\n throw new TypeError('This stream has already been locked for exclusive writing by another writer');\n }\n\n this._ownerWritableStream = stream;\n stream._writer = this;\n\n const state = stream._state;\n\n if (state === 'writable') {\n if (!WritableStreamCloseQueuedOrInFlight(stream) && stream._backpressure) {\n defaultWriterReadyPromiseInitialize(this);\n } else {\n defaultWriterReadyPromiseInitializeAsResolved(this);\n }\n\n defaultWriterClosedPromiseInitialize(this);\n } else if (state === 'erroring') {\n defaultWriterReadyPromiseInitializeAsRejected(this, stream._storedError);\n defaultWriterClosedPromiseInitialize(this);\n } else if (state === 'closed') {\n defaultWriterReadyPromiseInitializeAsResolved(this);\n defaultWriterClosedPromiseInitializeAsResolved(this);\n } else {\n assert(state === 'errored');\n\n const storedError = stream._storedError;\n defaultWriterReadyPromiseInitializeAsRejected(this, storedError);\n defaultWriterClosedPromiseInitializeAsRejected(this, storedError);\n }\n }\n\n /**\n * Returns a promise that will be fulfilled when the stream becomes closed, or rejected if the stream ever errors or\n * the writer’s lock is released before the stream finishes closing.\n */\n get closed(): Promise<undefined> {\n if (!IsWritableStreamDefaultWriter(this)) {\n return promiseRejectedWith(defaultWriterBrandCheckException('closed'));\n }\n\n return this._closedPromise;\n }\n\n /**\n * Returns the desired size to fill the stream’s internal queue. It can be negative, if the queue is over-full.\n * A producer can use this information to determine the right amount of data to write.\n *\n * It will be `null` if the stream cannot be successfully written to (due to either being errored, or having an abort\n * queued up). It will return zero if the stream is closed. And the getter will throw an exception if invoked when\n * the writer’s lock is released.\n */\n get desiredSize(): number | null {\n if (!IsWritableStreamDefaultWriter(this)) {\n throw defaultWriterBrandCheckException('desiredSize');\n }\n\n if (this._ownerWritableStream === undefined) {\n throw defaultWriterLockException('desiredSize');\n }\n\n return WritableStreamDefaultWriterGetDesiredSize(this);\n }\n\n /**\n * Returns a promise that will be fulfilled when the desired size to fill the stream’s internal queue transitions\n * from non-positive to positive, signaling that it is no longer applying backpressure. Once the desired size dips\n * back to zero or below, the getter will return a new promise that stays pending until the next transition.\n *\n * If the stream becomes errored or aborted, or the writer’s lock is released, the returned promise will become\n * rejected.\n */\n get ready(): Promise<undefined> {\n if (!IsWritableStreamDefaultWriter(this)) {\n return promiseRejectedWith(defaultWriterBrandCheckException('ready'));\n }\n\n return this._readyPromise;\n }\n\n /**\n * If the reader is active, behaves the same as {@link WritableStream.abort | stream.abort(reason)}.\n */\n abort(reason: any = undefined): Promise<void> {\n if (!IsWritableStreamDefaultWriter(this)) {\n return promiseRejectedWith(defaultWriterBrandCheckException('abort'));\n }\n\n if (this._ownerWritableStream === undefined) {\n return promiseRejectedWith(defaultWriterLockException('abort'));\n }\n\n return WritableStreamDefaultWriterAbort(this, reason);\n }\n\n /**\n * If the reader is active, behaves the same as {@link WritableStream.close | stream.close()}.\n */\n close(): Promise<void> {\n if (!IsWritableStreamDefaultWriter(this)) {\n return promiseRejectedWith(defaultWriterBrandCheckException('close'));\n }\n\n const stream = this._ownerWritableStream;\n\n if (stream === undefined) {\n return promiseRejectedWith(defaultWriterLockException('close'));\n }\n\n if (WritableStreamCloseQueuedOrInFlight(stream)) {\n return promiseRejectedWith(new TypeError('Cannot close an already-closing stream'));\n }\n\n return WritableStreamDefaultWriterClose(this);\n }\n\n /**\n * Releases the writer’s lock on the corresponding stream. After the lock is released, the writer is no longer active.\n * If the associated stream is errored when the lock is released, the writer will appear errored in the same way from\n * now on; otherwise, the writer will appear closed.\n *\n * Note that the lock can still be released even if some ongoing writes have not yet finished (i.e. even if the\n * promises returned from previous calls to {@link WritableStreamDefaultWriter.write | write()} have not yet settled).\n * It’s not necessary to hold the lock on the writer for the duration of the write; the lock instead simply prevents\n * other producers from writing in an interleaved manner.\n */\n releaseLock(): void {\n if (!IsWritableStreamDefaultWriter(this)) {\n throw defaultWriterBrandCheckException('releaseLock');\n }\n\n const stream = this._ownerWritableStream;\n\n if (stream === undefined) {\n return;\n }\n\n assert(stream._writer !== undefined);\n\n WritableStreamDefaultWriterRelease(this);\n }\n\n /**\n * Writes the given chunk to the writable stream, by waiting until any previous writes have finished successfully,\n * and then sending the chunk to the underlying sink's {@link UnderlyingSink.write | write()} method. It will return\n * a promise that fulfills with undefined upon a successful write, or rejects if the write fails or stream becomes\n * errored before the writing process is initiated.\n *\n * Note that what \"success\" means is up to the underlying sink; it might indicate simply that the chunk has been\n * accepted, and not necessarily that it is safely saved to its ultimate destination.\n */\n write(chunk: W): Promise<void>;\n write(chunk: W = undefined!): Promise<void> {\n if (!IsWritableStreamDefaultWriter(this)) {\n return promiseRejectedWith(defaultWriterBrandCheckException('write'));\n }\n\n if (this._ownerWritableStream === undefined) {\n return promiseRejectedWith(defaultWriterLockException('write to'));\n }\n\n return WritableStreamDefaultWriterWrite(this, chunk);\n }\n}\n\nObject.defineProperties(WritableStreamDefaultWriter.prototype, {\n abort: { enumerable: true },\n close: { enumerable: true },\n releaseLock: { enumerable: true },\n write: { enumerable: true },\n closed: { enumerable: true },\n desiredSize: { enumerable: true },\n ready: { enumerable: true }\n});\nif (typeof Symbol.toStringTag === 'symbol') {\n Object.defineProperty(WritableStreamDefaultWriter.prototype, Symbol.toStringTag, {\n value: 'WritableStreamDefaultWriter',\n configurable: true\n });\n}\n\n// Abstract operations for the WritableStreamDefaultWriter.\n\nfunction IsWritableStreamDefaultWriter<W = any>(x: any): x is WritableStreamDefaultWriter<W> {\n if (!typeIsObject(x)) {\n return false;\n }\n\n if (!Object.prototype.hasOwnProperty.call(x, '_ownerWritableStream')) {\n return false;\n }\n\n return x instanceof WritableStreamDefaultWriter;\n}\n\n// A client of WritableStreamDefaultWriter may use these functions directly to bypass state check.\n\nfunction WritableStreamDefaultWriterAbort(writer: WritableStreamDefaultWriter, reason: any) {\n const stream = writer._ownerWritableStream;\n\n assert(stream !== undefined);\n\n return WritableStreamAbort(stream, reason);\n}\n\nfunction WritableStreamDefaultWriterClose(writer: WritableStreamDefaultWriter): Promise<undefined> {\n const stream = writer._ownerWritableStream;\n\n assert(stream !== undefined);\n\n return WritableStreamClose(stream);\n}\n\nfunction WritableStreamDefaultWriterCloseWithErrorPropagation(writer: WritableStreamDefaultWriter): Promise<undefined> {\n const stream = writer._ownerWritableStream;\n\n assert(stream !== undefined);\n\n const state = stream._state;\n if (WritableStreamCloseQueuedOrInFlight(stream) || state === 'closed') {\n return promiseResolvedWith(undefined);\n }\n\n if (state === 'errored') {\n return promiseRejectedWith(stream._storedError);\n }\n\n assert(state === 'writable' || state === 'erroring');\n\n return WritableStreamDefaultWriterClose(writer);\n}\n\nfunction WritableStreamDefaultWriterEnsureClosedPromiseRejected(writer: WritableStreamDefaultWriter, error: any) {\n if (writer._closedPromiseState === 'pending') {\n defaultWriterClosedPromiseReject(writer, error);\n } else {\n defaultWriterClosedPromiseResetToRejected(writer, error);\n }\n}\n\nfunction WritableStreamDefaultWriterEnsureReadyPromiseRejected(writer: WritableStreamDefaultWriter, error: any) {\n if (writer._readyPromiseState === 'pending') {\n defaultWriterReadyPromiseReject(writer, error);\n } else {\n defaultWriterReadyPromiseResetToRejected(writer, error);\n }\n}\n\nfunction WritableStreamDefaultWriterGetDesiredSize(writer: WritableStreamDefaultWriter): number | null {\n const stream = writer._ownerWritableStream;\n const state = stream._state;\n\n if (state === 'errored' || state === 'erroring') {\n return null;\n }\n\n if (state === 'closed') {\n return 0;\n }\n\n return WritableStreamDefaultControllerGetDesiredSize(stream._writableStreamController);\n}\n\nfunction WritableStreamDefaultWriterRelease(writer: WritableStreamDefaultWriter) {\n const stream = writer._ownerWritableStream;\n assert(stream !== undefined);\n assert(stream._writer === writer);\n\n const releasedError = new TypeError(\n `Writer was released and can no longer be used to monitor the stream's closedness`);\n\n WritableStreamDefaultWriterEnsureReadyPromiseRejected(writer, releasedError);\n\n // The state transitions to \"errored\" before the sink abort() method runs, but the writer.closed promise is not\n // rejected until afterwards. This means that simply testing state will not work.\n WritableStreamDefaultWriterEnsureClosedPromiseRejected(writer, releasedError);\n\n stream._writer = undefined;\n writer._ownerWritableStream = undefined!;\n}\n\nfunction WritableStreamDefaultWriterWrite<W>(writer: WritableStreamDefaultWriter<W>, chunk: W): Promise<undefined> {\n const stream = writer._ownerWritableStream;\n\n assert(stream !== undefined);\n\n const controller = stream._writableStreamController;\n\n const chunkSize = WritableStreamDefaultControllerGetChunkSize(controller, chunk);\n\n if (stream !== writer._ownerWritableStream) {\n return promiseRejectedWith(defaultWriterLockException('write to'));\n }\n\n const state = stream._state;\n if (state === 'errored') {\n return promiseRejectedWith(stream._storedError);\n }\n if (WritableStreamCloseQueuedOrInFlight(stream) || state === 'closed') {\n return promiseRejectedWith(new TypeError('The stream is closing or closed and cannot be written to'));\n }\n if (state === 'erroring') {\n return promiseRejectedWith(stream._storedError);\n }\n\n assert(state === 'writable');\n\n const promise = WritableStreamAddWriteRequest(stream);\n\n WritableStreamDefaultControllerWrite(controller, chunk, chunkSize);\n\n return promise;\n}\n\nconst closeSentinel: unique symbol = {} as any;\n\ntype QueueRecord<W> = W | typeof closeSentinel;\n\n/**\n * Allows control of a {@link WritableStream | writable stream}'s state and internal queue.\n *\n * @public\n */\nexport class WritableStreamDefaultController<W = any> {\n /** @internal */\n _controlledWritableStream!: WritableStream<W>;\n /** @internal */\n _queue!: SimpleQueue<QueuePair<QueueRecord<W>>>;\n /** @internal */\n _queueTotalSize!: number;\n /** @internal */\n _abortReason: any;\n /** @internal */\n _abortController: AbortController | undefined;\n /** @internal */\n _started!: boolean;\n /** @internal */\n _strategySizeAlgorithm!: QueuingStrategySizeCallback<W>;\n /** @internal */\n _strategyHWM!: number;\n /** @internal */\n _writeAlgorithm!: (chunk: W) => Promise<void>;\n /** @internal */\n _closeAlgorithm!: () => Promise<void>;\n /** @internal */\n _abortAlgorithm!: (reason: any) => Promise<void>;\n\n private constructor() {\n throw new TypeError('Illegal constructor');\n }\n\n /**\n * The reason which was passed to `WritableStream.abort(reason)` when the stream was aborted.\n *\n * @deprecated\n * This property has been removed from the specification, see https://github.com/whatwg/streams/pull/1177.\n * Use {@link WritableStreamDefaultController.signal}'s `reason` instead.\n */\n get abortReason(): any {\n if (!IsWritableStreamDefaultController(this)) {\n throw defaultControllerBrandCheckException('abortReason');\n }\n return this._abortReason;\n }\n\n /**\n * An `AbortSignal` that can be used to abort the pending write or close operation when the stream is aborted.\n */\n get signal(): AbortSignal {\n if (!IsWritableStreamDefaultController(this)) {\n throw defaultControllerBrandCheckException('signal');\n }\n if (this._abortController === undefined) {\n // Older browsers or older Node versions may not support `AbortController` or `AbortSignal`.\n // We don't want to bundle and ship an `AbortController` polyfill together with our polyfill,\n // so instead we only implement support for `signal` if we find a global `AbortController` constructor.\n throw new TypeError('WritableStreamDefaultController.prototype.signal is not supported');\n }\n return this._abortController.signal;\n }\n\n /**\n * Closes the controlled writable stream, making all future interactions with it fail with the given error `e`.\n *\n * This method is rarely used, since usually it suffices to return a rejected promise from one of the underlying\n * sink's methods. However, it can be useful for suddenly shutting down a stream in response to an event outside the\n * normal lifecycle of interactions with the underlying sink.\n */\n error(e: any = undefined): void {\n if (!IsWritableStreamDefaultController(this)) {\n throw defaultControllerBrandCheckException('error');\n }\n const state = this._controlledWritableStream._state;\n if (state !== 'writable') {\n // The stream is closed, errored or will be soon. The sink can't do anything useful if it gets an error here, so\n // just treat it as a no-op.\n return;\n }\n\n WritableStreamDefaultControllerError(this, e);\n }\n\n /** @internal */\n [AbortSteps](reason: any): Promise<void> {\n const result = this._abortAlgorithm(reason);\n WritableStreamDefaultControllerClearAlgorithms(this);\n return result;\n }\n\n /** @internal */\n [ErrorSteps]() {\n ResetQueue(this);\n }\n}\n\nObject.defineProperties(WritableStreamDefaultController.prototype, {\n abortReason: { enumerable: true },\n signal: { enumerable: true },\n error: { enumerable: true }\n});\nif (typeof Symbol.toStringTag === 'symbol') {\n Object.defineProperty(WritableStreamDefaultController.prototype, Symbol.toStringTag, {\n value: 'WritableStreamDefaultController',\n configurable: true\n });\n}\n\n// Abstract operations implementing interface required by the WritableStream.\n\nfunction IsWritableStreamDefaultController(x: any): x is WritableStreamDefaultController<any> {\n if (!typeIsObject(x)) {\n return false;\n }\n\n if (!Object.prototype.hasOwnProperty.call(x, '_controlledWritableStream')) {\n return false;\n }\n\n return x instanceof WritableStreamDefaultController;\n}\n\nfunction SetUpWritableStreamDefaultController<W>(stream: WritableStream<W>,\n controller: WritableStreamDefaultController<W>,\n startAlgorithm: () => void | PromiseLike<void>,\n writeAlgorithm: (chunk: W) => Promise<void>,\n closeAlgorithm: () => Promise<void>,\n abortAlgorithm: (reason: any) => Promise<void>,\n highWaterMark: number,\n sizeAlgorithm: QueuingStrategySizeCallback<W>) {\n assert(IsWritableStream(stream));\n assert(stream._writableStreamController === undefined);\n\n controller._controlledWritableStream = stream;\n stream._writableStreamController = controller;\n\n // Need to set the slots so that the assert doesn't fire. In the spec the slots already exist implicitly.\n controller._queue = undefined!;\n controller._queueTotalSize = undefined!;\n ResetQueue(controller);\n\n controller._abortReason = undefined;\n controller._abortController = createAbortController();\n controller._started = false;\n\n controller._strategySizeAlgorithm = sizeAlgorithm;\n controller._strategyHWM = highWaterMark;\n\n controller._writeAlgorithm = writeAlgorithm;\n controller._closeAlgorithm = closeAlgorithm;\n controller._abortAlgorithm = abortAlgorithm;\n\n const backpressure = WritableStreamDefaultControllerGetBackpressure(controller);\n WritableStreamUpdateBackpressure(stream, backpressure);\n\n const startResult = startAlgorithm();\n const startPromise = promiseResolvedWith(startResult);\n uponPromise(\n startPromise,\n () => {\n assert(stream._state === 'writable' || stream._state === 'erroring');\n controller._started = true;\n WritableStreamDefaultControllerAdvanceQueueIfNeeded(controller);\n },\n r => {\n assert(stream._state === 'writable' || stream._state === 'erroring');\n controller._started = true;\n WritableStreamDealWithRejection(stream, r);\n }\n );\n}\n\nfunction SetUpWritableStreamDefaultControllerFromUnderlyingSink<W>(stream: WritableStream<W>,\n underlyingSink: ValidatedUnderlyingSink<W>,\n highWaterMark: number,\n sizeAlgorithm: QueuingStrategySizeCallback<W>) {\n const controller = Object.create(WritableStreamDefaultController.prototype);\n\n let startAlgorithm: () => void | PromiseLike<void> = () => undefined;\n let writeAlgorithm: (chunk: W) => Promise<void> = () => promiseResolvedWith(undefined);\n let closeAlgorithm: () => Promise<void> = () => promiseResolvedWith(undefined);\n let abortAlgorithm: (reason: any) => Promise<void> = () => promiseResolvedWith(undefined);\n\n if (underlyingSink.start !== undefined) {\n startAlgorithm = () => underlyingSink.start!(controller);\n }\n if (underlyingSink.write !== undefined) {\n writeAlgorithm = chunk => underlyingSink.write!(chunk, controller);\n }\n if (underlyingSink.close !== undefined) {\n closeAlgorithm = () => underlyingSink.close!();\n }\n if (underlyingSink.abort !== undefined) {\n abortAlgorithm = reason => underlyingSink.abort!(reason);\n }\n\n SetUpWritableStreamDefaultController(\n stream, controller, startAlgorithm, writeAlgorithm, closeAlgorithm, abortAlgorithm, highWaterMark, sizeAlgorithm\n );\n}\n\n// ClearAlgorithms may be called twice. Erroring the same stream in multiple ways will often result in redundant calls.\nfunction WritableStreamDefaultControllerClearAlgorithms(controller: WritableStreamDefaultController<any>) {\n controller._writeAlgorithm = undefined!;\n controller._closeAlgorithm = undefined!;\n controller._abortAlgorithm = undefined!;\n controller._strategySizeAlgorithm = undefined!;\n}\n\nfunction WritableStreamDefaultControllerClose<W>(controller: WritableStreamDefaultController<W>) {\n EnqueueValueWithSize(controller, closeSentinel, 0);\n WritableStreamDefaultControllerAdvanceQueueIfNeeded(controller);\n}\n\nfunction WritableStreamDefaultControllerGetChunkSize<W>(controller: WritableStreamDefaultController<W>,\n chunk: W): number {\n try {\n return controller._strategySizeAlgorithm(chunk);\n } catch (chunkSizeE) {\n WritableStreamDefaultControllerErrorIfNeeded(controller, chunkSizeE);\n return 1;\n }\n}\n\nfunction WritableStreamDefaultControllerGetDesiredSize(controller: WritableStreamDefaultController<any>): number {\n return controller._strategyHWM - controller._queueTotalSize;\n}\n\nfunction WritableStreamDefaultControllerWrite<W>(controller: WritableStreamDefaultController<W>,\n chunk: W,\n chunkSize: number) {\n try {\n EnqueueValueWithSize(controller, chunk, chunkSize);\n } catch (enqueueE) {\n WritableStreamDefaultControllerErrorIfNeeded(controller, enqueueE);\n return;\n }\n\n const stream = controller._controlledWritableStream;\n if (!WritableStreamCloseQueuedOrInFlight(stream) && stream._state === 'writable') {\n const backpressure = WritableStreamDefaultControllerGetBackpressure(controller);\n WritableStreamUpdateBackpressure(stream, backpressure);\n }\n\n WritableStreamDefaultControllerAdvanceQueueIfNeeded(controller);\n}\n\n// Abstract operations for the WritableStreamDefaultController.\n\nfunction WritableStreamDefaultControllerAdvanceQueueIfNeeded<W>(controller: WritableStreamDefaultController<W>) {\n const stream = controller._controlledWritableStream;\n\n if (!controller._started) {\n return;\n }\n\n if (stream._inFlightWriteRequest !== undefined) {\n return;\n }\n\n const state = stream._state;\n assert(state !== 'closed' && state !== 'errored');\n if (state === 'erroring') {\n WritableStreamFinishErroring(stream);\n return;\n }\n\n if (controller._queue.length === 0) {\n return;\n }\n\n const value = PeekQueueValue(controller);\n if (value === closeSentinel) {\n WritableStreamDefaultControllerProcessClose(controller);\n } else {\n WritableStreamDefaultControllerProcessWrite(controller, value);\n }\n}\n\nfunction WritableStreamDefaultControllerErrorIfNeeded(controller: WritableStreamDefaultController<any>, error: any) {\n if (controller._controlledWritableStream._state === 'writable') {\n WritableStreamDefaultControllerError(controller, error);\n }\n}\n\nfunction WritableStreamDefaultControllerProcessClose(controller: WritableStreamDefaultController<any>) {\n const stream = controller._controlledWritableStream;\n\n WritableStreamMarkCloseRequestInFlight(stream);\n\n DequeueValue(controller);\n assert(controller._queue.length === 0);\n\n const sinkClosePromise = controller._closeAlgorithm();\n WritableStreamDefaultControllerClearAlgorithms(controller);\n uponPromise(\n sinkClosePromise,\n () => {\n WritableStreamFinishInFlightClose(stream);\n },\n reason => {\n WritableStreamFinishInFlightCloseWithError(stream, reason);\n }\n );\n}\n\nfunction WritableStreamDefaultControllerProcessWrite<W>(controller: WritableStreamDefaultController<W>, chunk: W) {\n const stream = controller._controlledWritableStream;\n\n WritableStreamMarkFirstWriteRequestInFlight(stream);\n\n const sinkWritePromise = controller._writeAlgorithm(chunk);\n uponPromise(\n sinkWritePromise,\n () => {\n WritableStreamFinishInFlightWrite(stream);\n\n const state = stream._state;\n assert(state === 'writable' || state === 'erroring');\n\n DequeueValue(controller);\n\n if (!WritableStreamCloseQueuedOrInFlight(stream) && state === 'writable') {\n const backpressure = WritableStreamDefaultControllerGetBackpressure(controller);\n WritableStreamUpdateBackpressure(stream, backpressure);\n }\n\n WritableStreamDefaultControllerAdvanceQueueIfNeeded(controller);\n },\n reason => {\n if (stream._state === 'writable') {\n WritableStreamDefaultControllerClearAlgorithms(controller);\n }\n WritableStreamFinishInFlightWriteWithError(stream, reason);\n }\n );\n}\n\nfunction WritableStreamDefaultControllerGetBackpressure(controller: WritableStreamDefaultController<any>): boolean {\n const desiredSize = WritableStreamDefaultControllerGetDesiredSize(controller);\n return desiredSize <= 0;\n}\n\n// A client of WritableStreamDefaultController may use these functions directly to bypass state check.\n\nfunction WritableStreamDefaultControllerError(controller: WritableStreamDefaultController<any>, error: any) {\n const stream = controller._controlledWritableStream;\n\n assert(stream._state === 'writable');\n\n WritableStreamDefaultControllerClearAlgorithms(controller);\n WritableStreamStartErroring(stream, error);\n}\n\n// Helper functions for the WritableStream.\n\nfunction streamBrandCheckException(name: string): TypeError {\n return new TypeError(`WritableStream.prototype.${name} can only be used on a WritableStream`);\n}\n\n// Helper functions for the WritableStreamDefaultController.\n\nfunction defaultControllerBrandCheckException(name: string): TypeError {\n return new TypeError(\n `WritableStreamDefaultController.prototype.${name} can only be used on a WritableStreamDefaultController`);\n}\n\n\n// Helper functions for the WritableStreamDefaultWriter.\n\nfunction defaultWriterBrandCheckException(name: string): TypeError {\n return new TypeError(\n `WritableStreamDefaultWriter.prototype.${name} can only be used on a WritableStreamDefaultWriter`);\n}\n\nfunction defaultWriterLockException(name: string): TypeError {\n return new TypeError('Cannot ' + name + ' a stream using a released writer');\n}\n\nfunction defaultWriterClosedPromiseInitialize(writer: WritableStreamDefaultWriter) {\n writer._closedPromise = newPromise((resolve, reject) => {\n writer._closedPromise_resolve = resolve;\n writer._closedPromise_reject = reject;\n writer._closedPromiseState = 'pending';\n });\n}\n\nfunction defaultWriterClosedPromiseInitializeAsRejected(writer: WritableStreamDefaultWriter, reason: any) {\n defaultWriterClosedPromiseInitialize(writer);\n defaultWriterClosedPromiseReject(writer, reason);\n}\n\nfunction defaultWriterClosedPromiseInitializeAsResolved(writer: WritableStreamDefaultWriter) {\n defaultWriterClosedPromiseInitialize(writer);\n defaultWriterClosedPromiseResolve(writer);\n}\n\nfunction defaultWriterClosedPromiseReject(writer: WritableStreamDefaultWriter, reason: any) {\n if (writer._closedPromise_reject === undefined) {\n return;\n }\n assert(writer._closedPromiseState === 'pending');\n\n setPromiseIsHandledToTrue(writer._closedPromise);\n writer._closedPromise_reject(reason);\n writer._closedPromise_resolve = undefined;\n writer._closedPromise_reject = undefined;\n writer._closedPromiseState = 'rejected';\n}\n\nfunction defaultWriterClosedPromiseResetToRejected(writer: WritableStreamDefaultWriter, reason: any) {\n assert(writer._closedPromise_resolve === undefined);\n assert(writer._closedPromise_reject === undefined);\n assert(writer._closedPromiseState !== 'pending');\n\n defaultWriterClosedPromiseInitializeAsRejected(writer, reason);\n}\n\nfunction defaultWriterClosedPromiseResolve(writer: WritableStreamDefaultWriter) {\n if (writer._closedPromise_resolve === undefined) {\n return;\n }\n assert(writer._closedPromiseState === 'pending');\n\n writer._closedPromise_resolve(undefined);\n writer._closedPromise_resolve = undefined;\n writer._closedPromise_reject = undefined;\n writer._closedPromiseState = 'resolved';\n}\n\nfunction defaultWriterReadyPromiseInitialize(writer: WritableStreamDefaultWriter) {\n writer._readyPromise = newPromise((resolve, reject) => {\n writer._readyPromise_resolve = resolve;\n writer._readyPromise_reject = reject;\n });\n writer._readyPromiseState = 'pending';\n}\n\nfunction defaultWriterReadyPromiseInitializeAsRejected(writer: WritableStreamDefaultWriter, reason: any) {\n defaultWriterReadyPromiseInitialize(writer);\n defaultWriterReadyPromiseReject(writer, reason);\n}\n\nfunction defaultWriterReadyPromiseInitializeAsResolved(writer: WritableStreamDefaultWriter) {\n defaultWriterReadyPromiseInitialize(writer);\n defaultWriterReadyPromiseResolve(writer);\n}\n\nfunction defaultWriterReadyPromiseReject(writer: WritableStreamDefaultWriter, reason: any) {\n if (writer._readyPromise_reject === undefined) {\n return;\n }\n\n setPromiseIsHandledToTrue(writer._readyPromise);\n writer._readyPromise_reject(reason);\n writer._readyPromise_resolve = undefined;\n writer._readyPromise_reject = undefined;\n writer._readyPromiseState = 'rejected';\n}\n\nfunction defaultWriterReadyPromiseReset(writer: WritableStreamDefaultWriter) {\n assert(writer._readyPromise_resolve === undefined);\n assert(writer._readyPromise_reject === undefined);\n\n defaultWriterReadyPromiseInitialize(writer);\n}\n\nfunction defaultWriterReadyPromiseResetToRejected(writer: WritableStreamDefaultWriter, reason: any) {\n assert(writer._readyPromise_resolve === undefined);\n assert(writer._readyPromise_reject === undefined);\n\n defaultWriterReadyPromiseInitializeAsRejected(writer, reason);\n}\n\nfunction defaultWriterReadyPromiseResolve(writer: WritableStreamDefaultWriter) {\n if (writer._readyPromise_resolve === undefined) {\n return;\n }\n\n writer._readyPromise_resolve(undefined);\n writer._readyPromise_resolve = undefined;\n writer._readyPromise_reject = undefined;\n writer._readyPromiseState = 'fulfilled';\n}\n","/// <reference lib=\"dom\" />\nexport const NativeDOMException: typeof DOMException | undefined =\n typeof DOMException !== 'undefined' ? DOMException : undefined;\n","/// <reference types=\"node\" />\nimport { NativeDOMException } from './native';\n\ndeclare class DOMExceptionClass extends Error {\n constructor(message?: string, name?: string);\n\n name: string;\n message: string;\n}\n\ntype DOMException = DOMExceptionClass;\ntype DOMExceptionConstructor = typeof DOMExceptionClass;\n\nfunction isDOMExceptionConstructor(ctor: unknown): ctor is DOMExceptionConstructor {\n if (!(typeof ctor === 'function' || typeof ctor === 'object')) {\n return false;\n }\n try {\n new (ctor as DOMExceptionConstructor)();\n return true;\n } catch {\n return false;\n }\n}\n\nfunction createDOMExceptionPolyfill(): DOMExceptionConstructor {\n // eslint-disable-next-line no-shadow\n const ctor = function DOMException(this: DOMException, message?: string, name?: string) {\n this.message = message || '';\n this.name = name || 'Error';\n if (Error.captureStackTrace) {\n Error.captureStackTrace(this, this.constructor);\n }\n } as any;\n ctor.prototype = Object.create(Error.prototype);\n Object.defineProperty(ctor.prototype, 'constructor', { value: ctor, writable: true, configurable: true });\n return ctor;\n}\n\n// eslint-disable-next-line no-redeclare\nconst DOMException: DOMExceptionConstructor =\n isDOMExceptionConstructor(NativeDOMException) ? NativeDOMException : createDOMExceptionPolyfill();\n\nexport { DOMException };\n","import { IsReadableStream, IsReadableStreamLocked, ReadableStream, ReadableStreamCancel } from '../readable-stream';\nimport { AcquireReadableStreamDefaultReader, ReadableStreamDefaultReaderRead } from './default-reader';\nimport { ReadableStreamReaderGenericRelease } from './generic-reader';\nimport {\n AcquireWritableStreamDefaultWriter,\n IsWritableStream,\n IsWritableStreamLocked,\n WritableStream,\n WritableStreamAbort,\n WritableStreamCloseQueuedOrInFlight,\n WritableStreamDefaultWriterCloseWithErrorPropagation,\n WritableStreamDefaultWriterRelease,\n WritableStreamDefaultWriterWrite\n} from '../writable-stream';\nimport assert from '../../stub/assert';\nimport {\n newPromise,\n PerformPromiseThen,\n promiseResolvedWith,\n setPromiseIsHandledToTrue,\n uponFulfillment,\n uponPromise,\n uponRejection\n} from '../helpers/webidl';\nimport { noop } from '../../utils';\nimport { AbortSignal, isAbortSignal } from '../abort-signal';\nimport { DOMException } from '../../stub/dom-exception';\n\nexport function ReadableStreamPipeTo<T>(source: ReadableStream<T>,\n dest: WritableStream<T>,\n preventClose: boolean,\n preventAbort: boolean,\n preventCancel: boolean,\n signal: AbortSignal | undefined): Promise<undefined> {\n assert(IsReadableStream(source));\n assert(IsWritableStream(dest));\n assert(typeof preventClose === 'boolean');\n assert(typeof preventAbort === 'boolean');\n assert(typeof preventCancel === 'boolean');\n assert(signal === undefined || isAbortSignal(signal));\n assert(!IsReadableStreamLocked(source));\n assert(!IsWritableStreamLocked(dest));\n\n const reader = AcquireReadableStreamDefaultReader<T>(source);\n const writer = AcquireWritableStreamDefaultWriter<T>(dest);\n\n source._disturbed = true;\n\n let shuttingDown = false;\n\n // This is used to keep track of the spec's requirement that we wait for ongoing writes during shutdown.\n let currentWrite = promiseResolvedWith<void>(undefined);\n\n return newPromise((resolve, reject) => {\n let abortAlgorithm: () => void;\n if (signal !== undefined) {\n abortAlgorithm = () => {\n const error = new DOMException('Aborted', 'AbortError');\n const actions: Array<() => Promise<void>> = [];\n if (!preventAbort) {\n actions.push(() => {\n if (dest._state === 'writable') {\n return WritableStreamAbort(dest, error);\n }\n return promiseResolvedWith(undefined);\n });\n }\n if (!preventCancel) {\n actions.push(() => {\n if (source._state === 'readable') {\n return ReadableStreamCancel(source, error);\n }\n return promiseResolvedWith(undefined);\n });\n }\n shutdownWithAction(() => Promise.all(actions.map(action => action())), true, error);\n };\n\n if (signal.aborted) {\n abortAlgorithm();\n return;\n }\n\n signal.addEventListener('abort', abortAlgorithm);\n }\n\n // Using reader and writer, read all chunks from this and write them to dest\n // - Backpressure must be enforced\n // - Shutdown must stop all activity\n function pipeLoop() {\n return newPromise<void>((resolveLoop, rejectLoop) => {\n function next(done: boolean) {\n if (done) {\n resolveLoop();\n } else {\n // Use `PerformPromiseThen` instead of `uponPromise` to avoid\n // adding unnecessary `.catch(rethrowAssertionErrorRejection)` handlers\n PerformPromiseThen(pipeStep(), next, rejectLoop);\n }\n }\n\n next(false);\n });\n }\n\n function pipeStep(): Promise<boolean> {\n if (shuttingDown) {\n return promiseResolvedWith(true);\n }\n\n return PerformPromiseThen(writer._readyPromise, () => {\n return newPromise<boolean>((resolveRead, rejectRead) => {\n ReadableStreamDefaultReaderRead(\n reader,\n {\n _chunkSteps: chunk => {\n currentWrite = PerformPromiseThen(WritableStreamDefaultWriterWrite(writer, chunk), undefined, noop);\n resolveRead(false);\n },\n _closeSteps: () => resolveRead(true),\n _errorSteps: rejectRead\n }\n );\n });\n });\n }\n\n // Errors must be propagated forward\n isOrBecomesErrored(source, reader._closedPromise, storedError => {\n if (!preventAbort) {\n shutdownWithAction(() => WritableStreamAbort(dest, storedError), true, storedError);\n } else {\n shutdown(true, storedError);\n }\n });\n\n // Errors must be propagated backward\n isOrBecomesErrored(dest, writer._closedPromise, storedError => {\n if (!preventCancel) {\n shutdownWithAction(() => ReadableStreamCancel(source, storedError), true, storedError);\n } else {\n shutdown(true, storedError);\n }\n });\n\n // Closing must be propagated forward\n isOrBecomesClosed(source, reader._closedPromise, () => {\n if (!preventClose) {\n shutdownWithAction(() => WritableStreamDefaultWriterCloseWithErrorPropagation(writer));\n } else {\n shutdown();\n }\n });\n\n // Closing must be propagated backward\n if (WritableStreamCloseQueuedOrInFlight(dest) || dest._state === 'closed') {\n const destClosed = new TypeError('the destination writable stream closed before all data could be piped to it');\n\n if (!preventCancel) {\n shutdownWithAction(() => ReadableStreamCancel(source, destClosed), true, destClosed);\n } else {\n shutdown(true, destClosed);\n }\n }\n\n setPromiseIsHandledToTrue(pipeLoop());\n\n function waitForWritesToFinish(): Promise<void> {\n // Another write may have started while we were waiting on this currentWrite, so we have to be sure to wait\n // for that too.\n const oldCurrentWrite = currentWrite;\n return PerformPromiseThen(\n currentWrite,\n () => oldCurrentWrite !== currentWrite ? waitForWritesToFinish() : undefined\n );\n }\n\n function isOrBecomesErrored(stream: ReadableStream | WritableStream,\n promise: Promise<void>,\n action: (reason: any) => void) {\n if (stream._state === 'errored') {\n action(stream._storedError);\n } else {\n uponRejection(promise, action);\n }\n }\n\n function isOrBecomesClosed(stream: ReadableStream | WritableStream, promise: Promise<void>, action: () => void) {\n if (stream._state === 'closed') {\n action();\n } else {\n uponFulfillment(promise, action);\n }\n }\n\n function shutdownWithAction(action: () => Promise<unknown>, originalIsError?: boolean, originalError?: any) {\n if (shuttingDown) {\n return;\n }\n shuttingDown = true;\n\n if (dest._state === 'writable' && !WritableStreamCloseQueuedOrInFlight(dest)) {\n uponFulfillment(waitForWritesToFinish(), doTheRest);\n } else {\n doTheRest();\n }\n\n function doTheRest() {\n uponPromise(\n action(),\n () => finalize(originalIsError, originalError),\n newError => finalize(true, newError)\n );\n }\n }\n\n function shutdown(isError?: boolean, error?: any) {\n if (shuttingDown) {\n return;\n }\n shuttingDown = true;\n\n if (dest._state === 'writable' && !WritableStreamCloseQueuedOrInFlight(dest)) {\n uponFulfillment(waitForWritesToFinish(), () => finalize(isError, error));\n } else {\n finalize(isError, error);\n }\n }\n\n function finalize(isError?: boolean, error?: any) {\n WritableStreamDefaultWriterRelease(writer);\n ReadableStreamReaderGenericRelease(reader);\n\n if (signal !== undefined) {\n signal.removeEventListener('abort', abortAlgorithm);\n }\n if (isError) {\n reject(error);\n } else {\n resolve(undefined);\n }\n }\n });\n}\n","import { QueuingStrategySizeCallback } from '../queuing-strategy';\nimport assert from '../../stub/assert';\nimport { DequeueValue, EnqueueValueWithSize, QueuePair, ResetQueue } from '../abstract-ops/queue-with-sizes';\nimport {\n ReadableStreamAddReadRequest,\n ReadableStreamFulfillReadRequest,\n ReadableStreamGetNumReadRequests,\n ReadRequest\n} from './default-reader';\nimport { SimpleQueue } from '../simple-queue';\nimport { IsReadableStreamLocked, ReadableStream, ReadableStreamClose, ReadableStreamError } from '../readable-stream';\nimport { ValidatedUnderlyingSource } from './underlying-source';\nimport { typeIsObject } from '../helpers/miscellaneous';\nimport { CancelSteps, PullSteps } from '../abstract-ops/internal-methods';\nimport { promiseResolvedWith, uponPromise } from '../helpers/webidl';\n\n/**\n * Allows control of a {@link ReadableStream | readable stream}'s state and internal queue.\n *\n * @public\n */\nexport class ReadableStreamDefaultController<R> {\n /** @internal */\n _controlledReadableStream!: ReadableStream<R>;\n /** @internal */\n _queue!: SimpleQueue<QueuePair<R>>;\n /** @internal */\n _queueTotalSize!: number;\n /** @internal */\n _started!: boolean;\n /** @internal */\n _closeRequested!: boolean;\n /** @internal */\n _pullAgain!: boolean;\n /** @internal */\n _pulling !: boolean;\n /** @internal */\n _strategySizeAlgorithm!: QueuingStrategySizeCallback<R>;\n /** @internal */\n _strategyHWM!: number;\n /** @internal */\n _pullAlgorithm!: () => Promise<void>;\n /** @internal */\n _cancelAlgorithm!: (reason: any) => Promise<void>;\n\n private constructor() {\n throw new TypeError('Illegal constructor');\n }\n\n /**\n * Returns the desired size to fill the controlled stream's internal queue. It can be negative, if the queue is\n * over-full. An underlying source ought to use this information to determine when and how to apply backpressure.\n */\n get desiredSize(): number | null {\n if (!IsReadableStreamDefaultController(this)) {\n throw defaultControllerBrandCheckException('desiredSize');\n }\n\n return ReadableStreamDefaultControllerGetDesiredSize(this);\n }\n\n /**\n * Closes the controlled readable stream. Consumers will still be able to read any previously-enqueued chunks from\n * the stream, but once those are read, the stream will become closed.\n */\n close(): void {\n if (!IsReadableStreamDefaultController(this)) {\n throw defaultControllerBrandCheckException('close');\n }\n\n if (!ReadableStreamDefaultControllerCanCloseOrEnqueue(this)) {\n throw new TypeError('The stream is not in a state that permits close');\n }\n\n ReadableStreamDefaultControllerClose(this);\n }\n\n /**\n * Enqueues the given chunk `chunk` in the controlled readable stream.\n */\n enqueue(chunk: R): void;\n enqueue(chunk: R = undefined!): void {\n if (!IsReadableStreamDefaultController(this)) {\n throw defaultControllerBrandCheckException('enqueue');\n }\n\n if (!ReadableStreamDefaultControllerCanCloseOrEnqueue(this)) {\n throw new TypeError('The stream is not in a state that permits enqueue');\n }\n\n return ReadableStreamDefaultControllerEnqueue(this, chunk);\n }\n\n /**\n * Errors the controlled readable stream, making all future interactions with it fail with the given error `e`.\n */\n error(e: any = undefined): void {\n if (!IsReadableStreamDefaultController(this)) {\n throw defaultControllerBrandCheckException('error');\n }\n\n ReadableStreamDefaultControllerError(this, e);\n }\n\n /** @internal */\n [CancelSteps](reason: any): Promise<void> {\n ResetQueue(this);\n const result = this._cancelAlgorithm(reason);\n ReadableStreamDefaultControllerClearAlgorithms(this);\n return result;\n }\n\n /** @internal */\n [PullSteps](readRequest: ReadRequest<R>): void {\n const stream = this._controlledReadableStream;\n\n if (this._queue.length > 0) {\n const chunk = DequeueValue(this);\n\n if (this._closeRequested && this._queue.length === 0) {\n ReadableStreamDefaultControllerClearAlgorithms(this);\n ReadableStreamClose(stream);\n } else {\n ReadableStreamDefaultControllerCallPullIfNeeded(this);\n }\n\n readRequest._chunkSteps(chunk);\n } else {\n ReadableStreamAddReadRequest(stream, readRequest);\n ReadableStreamDefaultControllerCallPullIfNeeded(this);\n }\n }\n}\n\nObject.defineProperties(ReadableStreamDefaultController.prototype, {\n close: { enumerable: true },\n enqueue: { enumerable: true },\n error: { enumerable: true },\n desiredSize: { enumerable: true }\n});\nif (typeof Symbol.toStringTag === 'symbol') {\n Object.defineProperty(ReadableStreamDefaultController.prototype, Symbol.toStringTag, {\n value: 'ReadableStreamDefaultController',\n configurable: true\n });\n}\n\n// Abstract operations for the ReadableStreamDefaultController.\n\nfunction IsReadableStreamDefaultController<R = any>(x: any): x is ReadableStreamDefaultController<R> {\n if (!typeIsObject(x)) {\n return false;\n }\n\n if (!Object.prototype.hasOwnProperty.call(x, '_controlledReadableStream')) {\n return false;\n }\n\n return x instanceof ReadableStreamDefaultController;\n}\n\nfunction ReadableStreamDefaultControllerCallPullIfNeeded(controller: ReadableStreamDefaultController<any>): void {\n const shouldPull = ReadableStreamDefaultControllerShouldCallPull(controller);\n if (!shouldPull) {\n return;\n }\n\n if (controller._pulling) {\n controller._pullAgain = true;\n return;\n }\n\n assert(!controller._pullAgain);\n\n controller._pulling = true;\n\n const pullPromise = controller._pullAlgorithm();\n uponPromise(\n pullPromise,\n () => {\n controller._pulling = false;\n\n if (controller._pullAgain) {\n controller._pullAgain = false;\n ReadableStreamDefaultControllerCallPullIfNeeded(controller);\n }\n },\n e => {\n ReadableStreamDefaultControllerError(controller, e);\n }\n );\n}\n\nfunction ReadableStreamDefaultControllerShouldCallPull(controller: ReadableStreamDefaultController<any>): boolean {\n const stream = controller._controlledReadableStream;\n\n if (!ReadableStreamDefaultControllerCanCloseOrEnqueue(controller)) {\n return false;\n }\n\n if (!controller._started) {\n return false;\n }\n\n if (IsReadableStreamLocked(stream) && ReadableStreamGetNumReadRequests(stream) > 0) {\n return true;\n }\n\n const desiredSize = ReadableStreamDefaultControllerGetDesiredSize(controller);\n assert(desiredSize !== null);\n if (desiredSize! > 0) {\n return true;\n }\n\n return false;\n}\n\nfunction ReadableStreamDefaultControllerClearAlgorithms(controller: ReadableStreamDefaultController<any>) {\n controller._pullAlgorithm = undefined!;\n controller._cancelAlgorithm = undefined!;\n controller._strategySizeAlgorithm = undefined!;\n}\n\n// A client of ReadableStreamDefaultController may use these functions directly to bypass state check.\n\nexport function ReadableStreamDefaultControllerClose(controller: ReadableStreamDefaultController<any>) {\n if (!ReadableStreamDefaultControllerCanCloseOrEnqueue(controller)) {\n return;\n }\n\n const stream = controller._controlledReadableStream;\n\n controller._closeRequested = true;\n\n if (controller._queue.length === 0) {\n ReadableStreamDefaultControllerClearAlgorithms(controller);\n ReadableStreamClose(stream);\n }\n}\n\nexport function ReadableStreamDefaultControllerEnqueue<R>(\n controller: ReadableStreamDefaultController<R>,\n chunk: R\n): void {\n if (!ReadableStreamDefaultControllerCanCloseOrEnqueue(controller)) {\n return;\n }\n\n const stream = controller._controlledReadableStream;\n\n if (IsReadableStreamLocked(stream) && ReadableStreamGetNumReadRequests(stream) > 0) {\n ReadableStreamFulfillReadRequest(stream, chunk, false);\n } else {\n let chunkSize;\n try {\n chunkSize = controller._strategySizeAlgorithm(chunk);\n } catch (chunkSizeE) {\n ReadableStreamDefaultControllerError(controller, chunkSizeE);\n throw chunkSizeE;\n }\n\n try {\n EnqueueValueWithSize(controller, chunk, chunkSize);\n } catch (enqueueE) {\n ReadableStreamDefaultControllerError(controller, enqueueE);\n throw enqueueE;\n }\n }\n\n ReadableStreamDefaultControllerCallPullIfNeeded(controller);\n}\n\nexport function ReadableStreamDefaultControllerError(controller: ReadableStreamDefaultController<any>, e: any) {\n const stream = controller._controlledReadableStream;\n\n if (stream._state !== 'readable') {\n return;\n }\n\n ResetQueue(controller);\n\n ReadableStreamDefaultControllerClearAlgorithms(controller);\n ReadableStreamError(stream, e);\n}\n\nexport function ReadableStreamDefaultControllerGetDesiredSize(\n controller: ReadableStreamDefaultController<any>\n): number | null {\n const state = controller._controlledReadableStream._state;\n\n if (state === 'errored') {\n return null;\n }\n if (state === 'closed') {\n return 0;\n }\n\n return controller._strategyHWM - controller._queueTotalSize;\n}\n\n// This is used in the implementation of TransformStream.\nexport function ReadableStreamDefaultControllerHasBackpressure(\n controller: ReadableStreamDefaultController<any>\n): boolean {\n if (ReadableStreamDefaultControllerShouldCallPull(controller)) {\n return false;\n }\n\n return true;\n}\n\nexport function ReadableStreamDefaultControllerCanCloseOrEnqueue(\n controller: ReadableStreamDefaultController<any>\n): boolean {\n const state = controller._controlledReadableStream._state;\n\n if (!controller._closeRequested && state === 'readable') {\n return true;\n }\n\n return false;\n}\n\nexport function SetUpReadableStreamDefaultController<R>(stream: ReadableStream<R>,\n controller: ReadableStreamDefaultController<R>,\n startAlgorithm: () => void | PromiseLike<void>,\n pullAlgorithm: () => Promise<void>,\n cancelAlgorithm: (reason: any) => Promise<void>,\n highWaterMark: number,\n sizeAlgorithm: QueuingStrategySizeCallback<R>) {\n assert(stream._readableStreamController === undefined);\n\n controller._controlledReadableStream = stream;\n\n controller._queue = undefined!;\n controller._queueTotalSize = undefined!;\n ResetQueue(controller);\n\n controller._started = false;\n controller._closeRequested = false;\n controller._pullAgain = false;\n controller._pulling = false;\n\n controller._strategySizeAlgorithm = sizeAlgorithm;\n controller._strategyHWM = highWaterMark;\n\n controller._pullAlgorithm = pullAlgorithm;\n controller._cancelAlgorithm = cancelAlgorithm;\n\n stream._readableStreamController = controller;\n\n const startResult = startAlgorithm();\n uponPromise(\n promiseResolvedWith(startResult),\n () => {\n controller._started = true;\n\n assert(!controller._pulling);\n assert(!controller._pullAgain);\n\n ReadableStreamDefaultControllerCallPullIfNeeded(controller);\n },\n r => {\n ReadableStreamDefaultControllerError(controller, r);\n }\n );\n}\n\nexport function SetUpReadableStreamDefaultControllerFromUnderlyingSource<R>(\n stream: ReadableStream<R>,\n underlyingSource: ValidatedUnderlyingSource<R>,\n highWaterMark: number,\n sizeAlgorithm: QueuingStrategySizeCallback<R>\n) {\n const controller: ReadableStreamDefaultController<R> = Object.create(ReadableStreamDefaultController.prototype);\n\n let startAlgorithm: () => void | PromiseLike<void> = () => undefined;\n let pullAlgorithm: () => Promise<void> = () => promiseResolvedWith(undefined);\n let cancelAlgorithm: (reason: any) => Promise<void> = () => promiseResolvedWith(undefined);\n\n if (underlyingSource.start !== undefined) {\n startAlgorithm = () => underlyingSource.start!(controller);\n }\n if (underlyingSource.pull !== undefined) {\n pullAlgorithm = () => underlyingSource.pull!(controller);\n }\n if (underlyingSource.cancel !== undefined) {\n cancelAlgorithm = reason => underlyingSource.cancel!(reason);\n }\n\n SetUpReadableStreamDefaultController(\n stream, controller, startAlgorithm, pullAlgorithm, cancelAlgorithm, highWaterMark, sizeAlgorithm\n );\n}\n\n// Helper functions for the ReadableStreamDefaultController.\n\nfunction defaultControllerBrandCheckException(name: string): TypeError {\n return new TypeError(\n `ReadableStreamDefaultController.prototype.${name} can only be used on a ReadableStreamDefaultController`);\n}\n","import {\n CreateReadableByteStream,\n CreateReadableStream,\n IsReadableStream,\n ReadableByteStream,\n ReadableStream,\n ReadableStreamCancel,\n ReadableStreamReader\n} from '../readable-stream';\nimport { ReadableStreamReaderGenericRelease } from './generic-reader';\nimport {\n AcquireReadableStreamDefaultReader,\n IsReadableStreamDefaultReader,\n ReadableStreamDefaultReaderRead,\n ReadRequest\n} from './default-reader';\nimport {\n AcquireReadableStreamBYOBReader,\n IsReadableStreamBYOBReader,\n ReadableStreamBYOBReaderRead,\n ReadIntoRequest\n} from './byob-reader';\nimport assert from '../../stub/assert';\nimport { newPromise, promiseResolvedWith, queueMicrotask, uponRejection } from '../helpers/webidl';\nimport {\n ReadableStreamDefaultController,\n ReadableStreamDefaultControllerClose,\n ReadableStreamDefaultControllerEnqueue,\n ReadableStreamDefaultControllerError\n} from './default-controller';\nimport {\n IsReadableByteStreamController,\n ReadableByteStreamControllerClose,\n ReadableByteStreamControllerEnqueue,\n ReadableByteStreamControllerError,\n ReadableByteStreamControllerGetBYOBRequest,\n ReadableByteStreamControllerRespond,\n ReadableByteStreamControllerRespondWithNewView\n} from './byte-stream-controller';\nimport { CreateArrayFromList } from '../abstract-ops/ecmascript';\nimport { CloneAsUint8Array } from '../abstract-ops/miscellaneous';\n\nexport function ReadableStreamTee<R>(stream: ReadableStream<R>,\n cloneForBranch2: boolean): [ReadableStream<R>, ReadableStream<R>] {\n assert(IsReadableStream(stream));\n assert(typeof cloneForBranch2 === 'boolean');\n if (IsReadableByteStreamController(stream._readableStreamController)) {\n return ReadableByteStreamTee(stream as unknown as ReadableByteStream) as\n unknown as [ReadableStream<R>, ReadableStream<R>];\n }\n return ReadableStreamDefaultTee(stream, cloneForBranch2);\n}\n\nexport function ReadableStreamDefaultTee<R>(stream: ReadableStream<R>,\n cloneForBranch2: boolean): [ReadableStream<R>, ReadableStream<R>] {\n assert(IsReadableStream(stream));\n assert(typeof cloneForBranch2 === 'boolean');\n\n const reader = AcquireReadableStreamDefaultReader<R>(stream);\n\n let reading = false;\n let readAgain = false;\n let canceled1 = false;\n let canceled2 = false;\n let reason1: any;\n let reason2: any;\n let branch1: ReadableStream<R>;\n let branch2: ReadableStream<R>;\n\n let resolveCancelPromise: (value: undefined | Promise<undefined>) => void;\n const cancelPromise = newPromise<undefined>(resolve => {\n resolveCancelPromise = resolve;\n });\n\n function pullAlgorithm(): Promise<void> {\n if (reading) {\n readAgain = true;\n return promiseResolvedWith(undefined);\n }\n\n reading = true;\n\n const readRequest: ReadRequest<R> = {\n _chunkSteps: chunk => {\n // This needs to be delayed a microtask because it takes at least a microtask to detect errors (using\n // reader._closedPromise below), and we want errors in stream to error both branches immediately. We cannot let\n // successful synchronously-available reads get ahead of asynchronously-available errors.\n queueMicrotask(() => {\n readAgain = false;\n const chunk1 = chunk;\n const chunk2 = chunk;\n\n // There is no way to access the cloning code right now in the reference implementation.\n // If we add one then we'll need an implementation for serializable objects.\n // if (!canceled2 && cloneForBranch2) {\n // chunk2 = StructuredDeserialize(StructuredSerialize(chunk2));\n // }\n\n if (!canceled1) {\n ReadableStreamDefaultControllerEnqueue(\n branch1._readableStreamController as ReadableStreamDefaultController<R>,\n chunk1\n );\n }\n if (!canceled2) {\n ReadableStreamDefaultControllerEnqueue(\n branch2._readableStreamController as ReadableStreamDefaultController<R>,\n chunk2\n );\n }\n\n reading = false;\n if (readAgain) {\n pullAlgorithm();\n }\n });\n },\n _closeSteps: () => {\n reading = false;\n if (!canceled1) {\n ReadableStreamDefaultControllerClose(branch1._readableStreamController as ReadableStreamDefaultController<R>);\n }\n if (!canceled2) {\n ReadableStreamDefaultControllerClose(branch2._readableStreamController as ReadableStreamDefaultController<R>);\n }\n\n if (!canceled1 || !canceled2) {\n resolveCancelPromise(undefined);\n }\n },\n _errorSteps: () => {\n reading = false;\n }\n };\n ReadableStreamDefaultReaderRead(reader, readRequest);\n\n return promiseResolvedWith(undefined);\n }\n\n function cancel1Algorithm(reason: any): Promise<void> {\n canceled1 = true;\n reason1 = reason;\n if (canceled2) {\n const compositeReason = CreateArrayFromList([reason1, reason2]);\n const cancelResult = ReadableStreamCancel(stream, compositeReason);\n resolveCancelPromise(cancelResult);\n }\n return cancelPromise;\n }\n\n function cancel2Algorithm(reason: any): Promise<void> {\n canceled2 = true;\n reason2 = reason;\n if (canceled1) {\n const compositeReason = CreateArrayFromList([reason1, reason2]);\n const cancelResult = ReadableStreamCancel(stream, compositeReason);\n resolveCancelPromise(cancelResult);\n }\n return cancelPromise;\n }\n\n function startAlgorithm() {\n // do nothing\n }\n\n branch1 = CreateReadableStream(startAlgorithm, pullAlgorithm, cancel1Algorithm);\n branch2 = CreateReadableStream(startAlgorithm, pullAlgorithm, cancel2Algorithm);\n\n uponRejection(reader._closedPromise, (r: any) => {\n ReadableStreamDefaultControllerError(branch1._readableStreamController as ReadableStreamDefaultController<R>, r);\n ReadableStreamDefaultControllerError(branch2._readableStreamController as ReadableStreamDefaultController<R>, r);\n if (!canceled1 || !canceled2) {\n resolveCancelPromise(undefined);\n }\n });\n\n return [branch1, branch2];\n}\n\nexport function ReadableByteStreamTee(stream: ReadableByteStream): [ReadableByteStream, ReadableByteStream] {\n assert(IsReadableStream(stream));\n assert(IsReadableByteStreamController(stream._readableStreamController));\n\n let reader: ReadableStreamReader<Uint8Array> = AcquireReadableStreamDefaultReader(stream);\n let reading = false;\n let readAgainForBranch1 = false;\n let readAgainForBranch2 = false;\n let canceled1 = false;\n let canceled2 = false;\n let reason1: any;\n let reason2: any;\n let branch1: ReadableByteStream;\n let branch2: ReadableByteStream;\n\n let resolveCancelPromise: (value: undefined | Promise<undefined>) => void;\n const cancelPromise = newPromise<void>(resolve => {\n resolveCancelPromise = resolve;\n });\n\n function forwardReaderError(thisReader: ReadableStreamReader<Uint8Array>) {\n uponRejection(thisReader._closedPromise, r => {\n if (thisReader !== reader) {\n return;\n }\n ReadableByteStreamControllerError(branch1._readableStreamController, r);\n ReadableByteStreamControllerError(branch2._readableStreamController, r);\n if (!canceled1 || !canceled2) {\n resolveCancelPromise(undefined);\n }\n });\n }\n\n function pullWithDefaultReader() {\n if (IsReadableStreamBYOBReader(reader)) {\n assert(reader._readIntoRequests.length === 0);\n ReadableStreamReaderGenericRelease(reader);\n\n reader = AcquireReadableStreamDefaultReader(stream);\n forwardReaderError(reader);\n }\n\n const readRequest: ReadRequest<Uint8Array> = {\n _chunkSteps: chunk => {\n // This needs to be delayed a microtask because it takes at least a microtask to detect errors (using\n // reader._closedPromise below), and we want errors in stream to error both branches immediately. We cannot let\n // successful synchronously-available reads get ahead of asynchronously-available errors.\n queueMicrotask(() => {\n readAgainForBranch1 = false;\n readAgainForBranch2 = false;\n\n const chunk1 = chunk;\n let chunk2 = chunk;\n if (!canceled1 && !canceled2) {\n try {\n chunk2 = CloneAsUint8Array(chunk);\n } catch (cloneE) {\n ReadableByteStreamControllerError(branch1._readableStreamController, cloneE);\n ReadableByteStreamControllerError(branch2._readableStreamController, cloneE);\n resolveCancelPromise(ReadableStreamCancel(stream, cloneE));\n return;\n }\n }\n\n if (!canceled1) {\n ReadableByteStreamControllerEnqueue(branch1._readableStreamController, chunk1);\n }\n if (!canceled2) {\n ReadableByteStreamControllerEnqueue(branch2._readableStreamController, chunk2);\n }\n\n reading = false;\n if (readAgainForBranch1) {\n pull1Algorithm();\n } else if (readAgainForBranch2) {\n pull2Algorithm();\n }\n });\n },\n _closeSteps: () => {\n reading = false;\n if (!canceled1) {\n ReadableByteStreamControllerClose(branch1._readableStreamController);\n }\n if (!canceled2) {\n ReadableByteStreamControllerClose(branch2._readableStreamController);\n }\n if (branch1._readableStreamController._pendingPullIntos.length > 0) {\n ReadableByteStreamControllerRespond(branch1._readableStreamController, 0);\n }\n if (branch2._readableStreamController._pendingPullIntos.length > 0) {\n ReadableByteStreamControllerRespond(branch2._readableStreamController, 0);\n }\n if (!canceled1 || !canceled2) {\n resolveCancelPromise(undefined);\n }\n },\n _errorSteps: () => {\n reading = false;\n }\n };\n ReadableStreamDefaultReaderRead(reader, readRequest);\n }\n\n function pullWithBYOBReader(view: ArrayBufferView, forBranch2: boolean) {\n if (IsReadableStreamDefaultReader<Uint8Array>(reader)) {\n assert(reader._readRequests.length === 0);\n ReadableStreamReaderGenericRelease(reader);\n\n reader = AcquireReadableStreamBYOBReader(stream);\n forwardReaderError(reader);\n }\n\n const byobBranch = forBranch2 ? branch2 : branch1;\n const otherBranch = forBranch2 ? branch1 : branch2;\n\n const readIntoRequest: ReadIntoRequest<ArrayBufferView> = {\n _chunkSteps: chunk => {\n // This needs to be delayed a microtask because it takes at least a microtask to detect errors (using\n // reader._closedPromise below), and we want errors in stream to error both branches immediately. We cannot let\n // successful synchronously-available reads get ahead of asynchronously-available errors.\n queueMicrotask(() => {\n readAgainForBranch1 = false;\n readAgainForBranch2 = false;\n\n const byobCanceled = forBranch2 ? canceled2 : canceled1;\n const otherCanceled = forBranch2 ? canceled1 : canceled2;\n\n if (!otherCanceled) {\n let clonedChunk;\n try {\n clonedChunk = CloneAsUint8Array(chunk);\n } catch (cloneE) {\n ReadableByteStreamControllerError(byobBranch._readableStreamController, cloneE);\n ReadableByteStreamControllerError(otherBranch._readableStreamController, cloneE);\n resolveCancelPromise(ReadableStreamCancel(stream, cloneE));\n return;\n }\n if (!byobCanceled) {\n ReadableByteStreamControllerRespondWithNewView(byobBranch._readableStreamController, chunk);\n }\n ReadableByteStreamControllerEnqueue(otherBranch._readableStreamController, clonedChunk);\n } else if (!byobCanceled) {\n ReadableByteStreamControllerRespondWithNewView(byobBranch._readableStreamController, chunk);\n }\n\n reading = false;\n if (readAgainForBranch1) {\n pull1Algorithm();\n } else if (readAgainForBranch2) {\n pull2Algorithm();\n }\n });\n },\n _closeSteps: chunk => {\n reading = false;\n\n const byobCanceled = forBranch2 ? canceled2 : canceled1;\n const otherCanceled = forBranch2 ? canceled1 : canceled2;\n\n if (!byobCanceled) {\n ReadableByteStreamControllerClose(byobBranch._readableStreamController);\n }\n if (!otherCanceled) {\n ReadableByteStreamControllerClose(otherBranch._readableStreamController);\n }\n\n if (chunk !== undefined) {\n assert(chunk.byteLength === 0);\n\n if (!byobCanceled) {\n ReadableByteStreamControllerRespondWithNewView(byobBranch._readableStreamController, chunk);\n }\n if (!otherCanceled && otherBranch._readableStreamController._pendingPullIntos.length > 0) {\n ReadableByteStreamControllerRespond(otherBranch._readableStreamController, 0);\n }\n }\n\n if (!byobCanceled || !otherCanceled) {\n resolveCancelPromise(undefined);\n }\n },\n _errorSteps: () => {\n reading = false;\n }\n };\n ReadableStreamBYOBReaderRead(reader, view, readIntoRequest);\n }\n\n function pull1Algorithm(): Promise<void> {\n if (reading) {\n readAgainForBranch1 = true;\n return promiseResolvedWith(undefined);\n }\n\n reading = true;\n\n const byobRequest = ReadableByteStreamControllerGetBYOBRequest(branch1._readableStreamController);\n if (byobRequest === null) {\n pullWithDefaultReader();\n } else {\n pullWithBYOBReader(byobRequest._view!, false);\n }\n\n return promiseResolvedWith(undefined);\n }\n\n function pull2Algorithm(): Promise<void> {\n if (reading) {\n readAgainForBranch2 = true;\n return promiseResolvedWith(undefined);\n }\n\n reading = true;\n\n const byobRequest = ReadableByteStreamControllerGetBYOBRequest(branch2._readableStreamController);\n if (byobRequest === null) {\n pullWithDefaultReader();\n } else {\n pullWithBYOBReader(byobRequest._view!, true);\n }\n\n return promiseResolvedWith(undefined);\n }\n\n function cancel1Algorithm(reason: any): Promise<void> {\n canceled1 = true;\n reason1 = reason;\n if (canceled2) {\n const compositeReason = CreateArrayFromList([reason1, reason2]);\n const cancelResult = ReadableStreamCancel(stream, compositeReason);\n resolveCancelPromise(cancelResult);\n }\n return cancelPromise;\n }\n\n function cancel2Algorithm(reason: any): Promise<void> {\n canceled2 = true;\n reason2 = reason;\n if (canceled1) {\n const compositeReason = CreateArrayFromList([reason1, reason2]);\n const cancelResult = ReadableStreamCancel(stream, compositeReason);\n resolveCancelPromise(cancelResult);\n }\n return cancelPromise;\n }\n\n function startAlgorithm(): void {\n return;\n }\n\n branch1 = CreateReadableByteStream(startAlgorithm, pull1Algorithm, cancel1Algorithm);\n branch2 = CreateReadableByteStream(startAlgorithm, pull2Algorithm, cancel2Algorithm);\n\n forwardReaderError(reader);\n\n return [branch1, branch2];\n}\n","import { assertDictionary, assertFunction, convertUnsignedLongLongWithEnforceRange } from './basic';\nimport {\n ReadableStreamController,\n UnderlyingByteSource,\n UnderlyingDefaultOrByteSource,\n UnderlyingDefaultOrByteSourcePullCallback,\n UnderlyingDefaultOrByteSourceStartCallback,\n UnderlyingSource,\n UnderlyingSourceCancelCallback,\n ValidatedUnderlyingDefaultOrByteSource\n} from '../readable-stream/underlying-source';\nimport { promiseCall, reflectCall } from '../helpers/webidl';\n\nexport function convertUnderlyingDefaultOrByteSource<R>(\n source: UnderlyingSource<R> | UnderlyingByteSource | null,\n context: string\n): ValidatedUnderlyingDefaultOrByteSource<R> {\n assertDictionary(source, context);\n const original = source as (UnderlyingDefaultOrByteSource<R> | null);\n const autoAllocateChunkSize = original?.autoAllocateChunkSize;\n const cancel = original?.cancel;\n const pull = original?.pull;\n const start = original?.start;\n const type = original?.type;\n return {\n autoAllocateChunkSize: autoAllocateChunkSize === undefined ?\n undefined :\n convertUnsignedLongLongWithEnforceRange(\n autoAllocateChunkSize,\n `${context} has member 'autoAllocateChunkSize' that`\n ),\n cancel: cancel === undefined ?\n undefined :\n convertUnderlyingSourceCancelCallback(cancel, original!, `${context} has member 'cancel' that`),\n pull: pull === undefined ?\n undefined :\n convertUnderlyingSourcePullCallback(pull, original!, `${context} has member 'pull' that`),\n start: start === undefined ?\n undefined :\n convertUnderlyingSourceStartCallback(start, original!, `${context} has member 'start' that`),\n type: type === undefined ? undefined : convertReadableStreamType(type, `${context} has member 'type' that`)\n };\n}\n\nfunction convertUnderlyingSourceCancelCallback(\n fn: UnderlyingSourceCancelCallback,\n original: UnderlyingDefaultOrByteSource,\n context: string\n): (reason: any) => Promise<void> {\n assertFunction(fn, context);\n return (reason: any) => promiseCall(fn, original, [reason]);\n}\n\nfunction convertUnderlyingSourcePullCallback<R>(\n fn: UnderlyingDefaultOrByteSourcePullCallback<R>,\n original: UnderlyingDefaultOrByteSource<R>,\n context: string\n): (controller: ReadableStreamController<R>) => Promise<void> {\n assertFunction(fn, context);\n return (controller: ReadableStreamController<R>) => promiseCall(fn, original, [controller]);\n}\n\nfunction convertUnderlyingSourceStartCallback<R>(\n fn: UnderlyingDefaultOrByteSourceStartCallback<R>,\n original: UnderlyingDefaultOrByteSource<R>,\n context: string\n): UnderlyingDefaultOrByteSourceStartCallback<R> {\n assertFunction(fn, context);\n return (controller: ReadableStreamController<R>) => reflectCall(fn, original, [controller]);\n}\n\nfunction convertReadableStreamType(type: string, context: string): 'bytes' {\n type = `${type}`;\n if (type !== 'bytes') {\n throw new TypeError(`${context} '${type}' is not a valid enumeration value for ReadableStreamType`);\n }\n return type;\n}\n","import { assertDictionary } from './basic';\nimport { ReadableStreamGetReaderOptions } from '../readable-stream/reader-options';\n\nexport function convertReaderOptions(options: ReadableStreamGetReaderOptions | null | undefined,\n context: string): ReadableStreamGetReaderOptions {\n assertDictionary(options, context);\n const mode = options?.mode;\n return {\n mode: mode === undefined ? undefined : convertReadableStreamReaderMode(mode, `${context} has member 'mode' that`)\n };\n}\n\nfunction convertReadableStreamReaderMode(mode: string, context: string): 'byob' {\n mode = `${mode}`;\n if (mode !== 'byob') {\n throw new TypeError(`${context} '${mode}' is not a valid enumeration value for ReadableStreamReaderMode`);\n }\n return mode;\n}\n","import { assertDictionary } from './basic';\nimport { StreamPipeOptions, ValidatedStreamPipeOptions } from '../readable-stream/pipe-options';\nimport { AbortSignal, isAbortSignal } from '../abort-signal';\n\nexport function convertPipeOptions(options: StreamPipeOptions | null | undefined,\n context: string): ValidatedStreamPipeOptions {\n assertDictionary(options, context);\n const preventAbort = options?.preventAbort;\n const preventCancel = options?.preventCancel;\n const preventClose = options?.preventClose;\n const signal = options?.signal;\n if (signal !== undefined) {\n assertAbortSignal(signal, `${context} has member 'signal' that`);\n }\n return {\n preventAbort: Boolean(preventAbort),\n preventCancel: Boolean(preventCancel),\n preventClose: Boolean(preventClose),\n signal\n };\n}\n\nfunction assertAbortSignal(signal: unknown, context: string): asserts signal is AbortSignal {\n if (!isAbortSignal(signal)) {\n throw new TypeError(`${context} is not an AbortSignal.`);\n }\n}\n","import assert from '../stub/assert';\nimport {\n promiseRejectedWith,\n promiseResolvedWith,\n setPromiseIsHandledToTrue,\n transformPromiseWith\n} from './helpers/webidl';\nimport { QueuingStrategy, QueuingStrategySizeCallback } from './queuing-strategy';\nimport { AcquireReadableStreamAsyncIterator, ReadableStreamAsyncIterator } from './readable-stream/async-iterator';\nimport { defaultReaderClosedPromiseReject, defaultReaderClosedPromiseResolve } from './readable-stream/generic-reader';\nimport {\n AcquireReadableStreamDefaultReader,\n IsReadableStreamDefaultReader,\n ReadableStreamDefaultReader,\n ReadableStreamDefaultReadResult\n} from './readable-stream/default-reader';\nimport {\n AcquireReadableStreamBYOBReader,\n IsReadableStreamBYOBReader,\n ReadableStreamBYOBReader,\n ReadableStreamBYOBReadResult\n} from './readable-stream/byob-reader';\nimport { ReadableStreamPipeTo } from './readable-stream/pipe';\nimport { ReadableStreamTee } from './readable-stream/tee';\nimport { IsWritableStream, IsWritableStreamLocked, WritableStream } from './writable-stream';\nimport { SimpleQueue } from './simple-queue';\nimport {\n ReadableByteStreamController,\n ReadableStreamBYOBRequest,\n SetUpReadableByteStreamController,\n SetUpReadableByteStreamControllerFromUnderlyingSource\n} from './readable-stream/byte-stream-controller';\nimport {\n ReadableStreamDefaultController,\n SetUpReadableStreamDefaultController,\n SetUpReadableStreamDefaultControllerFromUnderlyingSource\n} from './readable-stream/default-controller';\nimport {\n UnderlyingByteSource,\n UnderlyingByteSourcePullCallback,\n UnderlyingByteSourceStartCallback,\n UnderlyingSource,\n UnderlyingSourceCancelCallback,\n UnderlyingSourcePullCallback,\n UnderlyingSourceStartCallback\n} from './readable-stream/underlying-source';\nimport { noop } from '../utils';\nimport { typeIsObject } from './helpers/miscellaneous';\nimport { CreateArrayFromList } from './abstract-ops/ecmascript';\nimport { CancelSteps } from './abstract-ops/internal-methods';\nimport { IsNonNegativeNumber } from './abstract-ops/miscellaneous';\nimport { assertObject, assertRequiredArgument } from './validators/basic';\nimport { convertQueuingStrategy } from './validators/queuing-strategy';\nimport { ExtractHighWaterMark, ExtractSizeAlgorithm } from './abstract-ops/queuing-strategy';\nimport { convertUnderlyingDefaultOrByteSource } from './validators/underlying-source';\nimport { ReadableStreamGetReaderOptions } from './readable-stream/reader-options';\nimport { convertReaderOptions } from './validators/reader-options';\nimport { StreamPipeOptions, ValidatedStreamPipeOptions } from './readable-stream/pipe-options';\nimport { ReadableStreamIteratorOptions } from './readable-stream/iterator-options';\nimport { convertIteratorOptions } from './validators/iterator-options';\nimport { convertPipeOptions } from './validators/pipe-options';\nimport { ReadableWritablePair } from './readable-stream/readable-writable-pair';\nimport { convertReadableWritablePair } from './validators/readable-writable-pair';\n\nexport type ReadableByteStream = ReadableStream<Uint8Array> & {\n _readableStreamController: ReadableByteStreamController\n};\n\ntype ReadableStreamState = 'readable' | 'closed' | 'errored';\n\n/**\n * A readable stream represents a source of data, from which you can read.\n *\n * @public\n */\nexport class ReadableStream<R = any> {\n /** @internal */\n _state!: ReadableStreamState;\n /** @internal */\n _reader: ReadableStreamReader<R> | undefined;\n /** @internal */\n _storedError: any;\n /** @internal */\n _disturbed!: boolean;\n /** @internal */\n _readableStreamController!: ReadableStreamDefaultController<R> | ReadableByteStreamController;\n\n constructor(underlyingSource: UnderlyingByteSource, strategy?: { highWaterMark?: number; size?: undefined });\n constructor(underlyingSource?: UnderlyingSource<R>, strategy?: QueuingStrategy<R>);\n constructor(rawUnderlyingSource: UnderlyingSource<R> | UnderlyingByteSource | null | undefined = {},\n rawStrategy: QueuingStrategy<R> | null | undefined = {}) {\n if (rawUnderlyingSource === undefined) {\n rawUnderlyingSource = null;\n } else {\n assertObject(rawUnderlyingSource, 'First parameter');\n }\n\n const strategy = convertQueuingStrategy(rawStrategy, 'Second parameter');\n const underlyingSource = convertUnderlyingDefaultOrByteSource(rawUnderlyingSource, 'First parameter');\n\n InitializeReadableStream(this);\n\n if (underlyingSource.type === 'bytes') {\n if (strategy.size !== undefined) {\n throw new RangeError('The strategy for a byte stream cannot have a size function');\n }\n const highWaterMark = ExtractHighWaterMark(strategy, 0);\n SetUpReadableByteStreamControllerFromUnderlyingSource(\n this as unknown as ReadableByteStream,\n underlyingSource,\n highWaterMark\n );\n } else {\n assert(underlyingSource.type === undefined);\n const sizeAlgorithm = ExtractSizeAlgorithm(strategy);\n const highWaterMark = ExtractHighWaterMark(strategy, 1);\n SetUpReadableStreamDefaultControllerFromUnderlyingSource(\n this,\n underlyingSource,\n highWaterMark,\n sizeAlgorithm\n );\n }\n }\n\n /**\n * Whether or not the readable stream is locked to a {@link ReadableStreamDefaultReader | reader}.\n */\n get locked(): boolean {\n if (!IsReadableStream(this)) {\n throw streamBrandCheckException('locked');\n }\n\n return IsReadableStreamLocked(this);\n }\n\n /**\n * Cancels the stream, signaling a loss of interest in the stream by a consumer.\n *\n * The supplied `reason` argument will be given to the underlying source's {@link UnderlyingSource.cancel | cancel()}\n * method, which might or might not use it.\n */\n cancel(reason: any = undefined): Promise<void> {\n if (!IsReadableStream(this)) {\n return promiseRejectedWith(streamBrandCheckException('cancel'));\n }\n\n if (IsReadableStreamLocked(this)) {\n return promiseRejectedWith(new TypeError('Cannot cancel a stream that already has a reader'));\n }\n\n return ReadableStreamCancel(this, reason);\n }\n\n /**\n * Creates a {@link ReadableStreamBYOBReader} and locks the stream to the new reader.\n *\n * This call behaves the same way as the no-argument variant, except that it only works on readable byte streams,\n * i.e. streams which were constructed specifically with the ability to handle \"bring your own buffer\" reading.\n * The returned BYOB reader provides the ability to directly read individual chunks from the stream via its\n * {@link ReadableStreamBYOBReader.read | read()} method, into developer-supplied buffers, allowing more precise\n * control over allocation.\n */\n getReader({ mode }: { mode: 'byob' }): ReadableStreamBYOBReader;\n /**\n * Creates a {@link ReadableStreamDefaultReader} and locks the stream to the new reader.\n * While the stream is locked, no other reader can be acquired until this one is released.\n *\n * This functionality is especially useful for creating abstractions that desire the ability to consume a stream\n * in its entirety. By getting a reader for the stream, you can ensure nobody else can interleave reads with yours\n * or cancel the stream, which would interfere with your abstraction.\n */\n getReader(): ReadableStreamDefaultReader<R>;\n getReader(\n rawOptions: ReadableStreamGetReaderOptions | null | undefined = undefined\n ): ReadableStreamDefaultReader<R> | ReadableStreamBYOBReader {\n if (!IsReadableStream(this)) {\n throw streamBrandCheckException('getReader');\n }\n\n const options = convertReaderOptions(rawOptions, 'First parameter');\n\n if (options.mode === undefined) {\n return AcquireReadableStreamDefaultReader(this);\n }\n\n assert(options.mode === 'byob');\n return AcquireReadableStreamBYOBReader(this as unknown as ReadableByteStream);\n }\n\n /**\n * Provides a convenient, chainable way of piping this readable stream through a transform stream\n * (or any other `{ writable, readable }` pair). It simply {@link ReadableStream.pipeTo | pipes} the stream\n * into the writable side of the supplied pair, and returns the readable side for further use.\n *\n * Piping a stream will lock it for the duration of the pipe, preventing any other consumer from acquiring a reader.\n */\n pipeThrough<RS extends ReadableStream>(\n transform: { readable: RS; writable: WritableStream<R> },\n options?: StreamPipeOptions\n ): RS;\n pipeThrough<RS extends ReadableStream>(\n rawTransform: { readable: RS; writable: WritableStream<R> } | null | undefined,\n rawOptions: StreamPipeOptions | null | undefined = {}\n ): RS {\n if (!IsReadableStream(this)) {\n throw streamBrandCheckException('pipeThrough');\n }\n assertRequiredArgument(rawTransform, 1, 'pipeThrough');\n\n const transform = convertReadableWritablePair(rawTransform, 'First parameter');\n const options = convertPipeOptions(rawOptions, 'Second parameter');\n\n if (IsReadableStreamLocked(this)) {\n throw new TypeError('ReadableStream.prototype.pipeThrough cannot be used on a locked ReadableStream');\n }\n if (IsWritableStreamLocked(transform.writable)) {\n throw new TypeError('ReadableStream.prototype.pipeThrough cannot be used on a locked WritableStream');\n }\n\n const promise = ReadableStreamPipeTo(\n this, transform.writable, options.preventClose, options.preventAbort, options.preventCancel, options.signal\n );\n\n setPromiseIsHandledToTrue(promise);\n\n return transform.readable;\n }\n\n /**\n * Pipes this readable stream to a given writable stream. The way in which the piping process behaves under\n * various error conditions can be customized with a number of passed options. It returns a promise that fulfills\n * when the piping process completes successfully, or rejects if any errors were encountered.\n *\n * Piping a stream will lock it for the duration of the pipe, preventing any other consumer from acquiring a reader.\n */\n pipeTo(destination: WritableStream<R>, options?: StreamPipeOptions): Promise<void>;\n pipeTo(destination: WritableStream<R> | null | undefined,\n rawOptions: StreamPipeOptions | null | undefined = {}): Promise<void> {\n if (!IsReadableStream(this)) {\n return promiseRejectedWith(streamBrandCheckException('pipeTo'));\n }\n\n if (destination === undefined) {\n return promiseRejectedWith(`Parameter 1 is required in 'pipeTo'.`);\n }\n if (!IsWritableStream(destination)) {\n return promiseRejectedWith(\n new TypeError(`ReadableStream.prototype.pipeTo's first argument must be a WritableStream`)\n );\n }\n\n let options: ValidatedStreamPipeOptions;\n try {\n options = convertPipeOptions(rawOptions, 'Second parameter');\n } catch (e) {\n return promiseRejectedWith(e);\n }\n\n if (IsReadableStreamLocked(this)) {\n return promiseRejectedWith(\n new TypeError('ReadableStream.prototype.pipeTo cannot be used on a locked ReadableStream')\n );\n }\n if (IsWritableStreamLocked(destination)) {\n return promiseRejectedWith(\n new TypeError('ReadableStream.prototype.pipeTo cannot be used on a locked WritableStream')\n );\n }\n\n return ReadableStreamPipeTo<R>(\n this, destination, options.preventClose, options.preventAbort, options.preventCancel, options.signal\n );\n }\n\n /**\n * Tees this readable stream, returning a two-element array containing the two resulting branches as\n * new {@link ReadableStream} instances.\n *\n * Teeing a stream will lock it, preventing any other consumer from acquiring a reader.\n * To cancel the stream, cancel both of the resulting branches; a composite cancellation reason will then be\n * propagated to the stream's underlying source.\n *\n * Note that the chunks seen in each branch will be the same object. If the chunks are not immutable,\n * this could allow interference between the two branches.\n */\n tee(): [ReadableStream<R>, ReadableStream<R>] {\n if (!IsReadableStream(this)) {\n throw streamBrandCheckException('tee');\n }\n\n const branches = ReadableStreamTee(this, false);\n return CreateArrayFromList(branches);\n }\n\n /**\n * Asynchronously iterates over the chunks in the stream's internal queue.\n *\n * Asynchronously iterating over the stream will lock it, preventing any other consumer from acquiring a reader.\n * The lock will be released if the async iterator's {@link ReadableStreamAsyncIterator.return | return()} method\n * is called, e.g. by breaking out of the loop.\n *\n * By default, calling the async iterator's {@link ReadableStreamAsyncIterator.return | return()} method will also\n * cancel the stream. To prevent this, use the stream's {@link ReadableStream.values | values()} method, passing\n * `true` for the `preventCancel` option.\n */\n values(options?: ReadableStreamIteratorOptions): ReadableStreamAsyncIterator<R>;\n values(rawOptions: ReadableStreamIteratorOptions | null | undefined = undefined): ReadableStreamAsyncIterator<R> {\n if (!IsReadableStream(this)) {\n throw streamBrandCheckException('values');\n }\n\n const options = convertIteratorOptions(rawOptions, 'First parameter');\n return AcquireReadableStreamAsyncIterator<R>(this, options.preventCancel);\n }\n\n /**\n * {@inheritDoc ReadableStream.values}\n */\n [Symbol.asyncIterator]: (options?: ReadableStreamIteratorOptions) => ReadableStreamAsyncIterator<R>;\n}\n\nObject.defineProperties(ReadableStream.prototype, {\n cancel: { enumerable: true },\n getReader: { enumerable: true },\n pipeThrough: { enumerable: true },\n pipeTo: { enumerable: true },\n tee: { enumerable: true },\n values: { enumerable: true },\n locked: { enumerable: true }\n});\nif (typeof Symbol.toStringTag === 'symbol') {\n Object.defineProperty(ReadableStream.prototype, Symbol.toStringTag, {\n value: 'ReadableStream',\n configurable: true\n });\n}\nif (typeof Symbol.asyncIterator === 'symbol') {\n Object.defineProperty(ReadableStream.prototype, Symbol.asyncIterator, {\n value: ReadableStream.prototype.values,\n writable: true,\n configurable: true\n });\n}\n\nexport {\n ReadableStreamAsyncIterator,\n ReadableStreamDefaultReadResult,\n ReadableStreamBYOBReadResult,\n UnderlyingByteSource,\n UnderlyingSource,\n UnderlyingSourceStartCallback,\n UnderlyingSourcePullCallback,\n UnderlyingSourceCancelCallback,\n UnderlyingByteSourceStartCallback,\n UnderlyingByteSourcePullCallback,\n StreamPipeOptions,\n ReadableWritablePair,\n ReadableStreamIteratorOptions\n};\n\n// Abstract operations for the ReadableStream.\n\n// Throws if and only if startAlgorithm throws.\nexport function CreateReadableStream<R>(startAlgorithm: () => void | PromiseLike<void>,\n pullAlgorithm: () => Promise<void>,\n cancelAlgorithm: (reason: any) => Promise<void>,\n highWaterMark = 1,\n sizeAlgorithm: QueuingStrategySizeCallback<R> = () => 1): ReadableStream<R> {\n assert(IsNonNegativeNumber(highWaterMark));\n\n const stream: ReadableStream<R> = Object.create(ReadableStream.prototype);\n InitializeReadableStream(stream);\n\n const controller: ReadableStreamDefaultController<R> = Object.create(ReadableStreamDefaultController.prototype);\n SetUpReadableStreamDefaultController(\n stream, controller, startAlgorithm, pullAlgorithm, cancelAlgorithm, highWaterMark, sizeAlgorithm\n );\n\n return stream;\n}\n\n// Throws if and only if startAlgorithm throws.\nexport function CreateReadableByteStream(\n startAlgorithm: () => void | PromiseLike<void>,\n pullAlgorithm: () => Promise<void>,\n cancelAlgorithm: (reason: any) => Promise<void>\n): ReadableByteStream {\n const stream: ReadableByteStream = Object.create(ReadableStream.prototype);\n InitializeReadableStream(stream);\n\n const controller: ReadableByteStreamController = Object.create(ReadableByteStreamController.prototype);\n SetUpReadableByteStreamController(stream, controller, startAlgorithm, pullAlgorithm, cancelAlgorithm, 0, undefined);\n\n return stream;\n}\n\nfunction InitializeReadableStream(stream: ReadableStream) {\n stream._state = 'readable';\n stream._reader = undefined;\n stream._storedError = undefined;\n stream._disturbed = false;\n}\n\nexport function IsReadableStream(x: unknown): x is ReadableStream {\n if (!typeIsObject(x)) {\n return false;\n }\n\n if (!Object.prototype.hasOwnProperty.call(x, '_readableStreamController')) {\n return false;\n }\n\n return x instanceof ReadableStream;\n}\n\nexport function IsReadableStreamDisturbed(stream: ReadableStream): boolean {\n assert(IsReadableStream(stream));\n\n return stream._disturbed;\n}\n\nexport function IsReadableStreamLocked(stream: ReadableStream): boolean {\n assert(IsReadableStream(stream));\n\n if (stream._reader === undefined) {\n return false;\n }\n\n return true;\n}\n\n// ReadableStream API exposed for controllers.\n\nexport function ReadableStreamCancel<R>(stream: ReadableStream<R>, reason: any): Promise<undefined> {\n stream._disturbed = true;\n\n if (stream._state === 'closed') {\n return promiseResolvedWith(undefined);\n }\n if (stream._state === 'errored') {\n return promiseRejectedWith(stream._storedError);\n }\n\n ReadableStreamClose(stream);\n\n const reader = stream._reader;\n if (reader !== undefined && IsReadableStreamBYOBReader(reader)) {\n reader._readIntoRequests.forEach(readIntoRequest => {\n readIntoRequest._closeSteps(undefined);\n });\n reader._readIntoRequests = new SimpleQueue();\n }\n\n const sourceCancelPromise = stream._readableStreamController[CancelSteps](reason);\n return transformPromiseWith(sourceCancelPromise, noop);\n}\n\nexport function ReadableStreamClose<R>(stream: ReadableStream<R>): void {\n assert(stream._state === 'readable');\n\n stream._state = 'closed';\n\n const reader = stream._reader;\n\n if (reader === undefined) {\n return;\n }\n\n defaultReaderClosedPromiseResolve(reader);\n\n if (IsReadableStreamDefaultReader<R>(reader)) {\n reader._readRequests.forEach(readRequest => {\n readRequest._closeSteps();\n });\n reader._readRequests = new SimpleQueue();\n }\n}\n\nexport function ReadableStreamError<R>(stream: ReadableStream<R>, e: any): void {\n assert(IsReadableStream(stream));\n assert(stream._state === 'readable');\n\n stream._state = 'errored';\n stream._storedError = e;\n\n const reader = stream._reader;\n\n if (reader === undefined) {\n return;\n }\n\n defaultReaderClosedPromiseReject(reader, e);\n\n if (IsReadableStreamDefaultReader<R>(reader)) {\n reader._readRequests.forEach(readRequest => {\n readRequest._errorSteps(e);\n });\n\n reader._readRequests = new SimpleQueue();\n } else {\n assert(IsReadableStreamBYOBReader(reader));\n\n reader._readIntoRequests.forEach(readIntoRequest => {\n readIntoRequest._errorSteps(e);\n });\n\n reader._readIntoRequests = new SimpleQueue();\n }\n}\n\n// Readers\n\nexport type ReadableStreamReader<R> = ReadableStreamDefaultReader<R> | ReadableStreamBYOBReader;\n\nexport {\n ReadableStreamDefaultReader,\n ReadableStreamBYOBReader\n};\n\n// Controllers\n\nexport {\n ReadableStreamDefaultController,\n ReadableStreamBYOBRequest,\n ReadableByteStreamController\n};\n\n// Helper functions for the ReadableStream.\n\nfunction streamBrandCheckException(name: string): TypeError {\n return new TypeError(`ReadableStream.prototype.${name} can only be used on a ReadableStream`);\n}\n","import { assertDictionary, assertRequiredField } from './basic';\nimport { ReadableStream } from '../readable-stream';\nimport { WritableStream } from '../writable-stream';\nimport { assertReadableStream } from './readable-stream';\nimport { assertWritableStream } from './writable-stream';\n\nexport function convertReadableWritablePair<RS extends ReadableStream, WS extends WritableStream>(\n pair: { readable: RS; writable: WS } | null | undefined,\n context: string\n): { readable: RS; writable: WS } {\n assertDictionary(pair, context);\n\n const readable = pair?.readable;\n assertRequiredField(readable, 'readable', 'ReadableWritablePair');\n assertReadableStream(readable, `${context} has member 'readable' that`);\n\n const writable = pair?.writable;\n assertRequiredField(writable, 'writable', 'ReadableWritablePair');\n assertWritableStream(writable, `${context} has member 'writable' that`);\n\n return { readable, writable };\n}\n","import { assertDictionary } from './basic';\nimport {\n ReadableStreamIteratorOptions,\n ValidatedReadableStreamIteratorOptions\n} from '../readable-stream/iterator-options';\n\nexport function convertIteratorOptions(options: ReadableStreamIteratorOptions | null | undefined,\n context: string): ValidatedReadableStreamIteratorOptions {\n assertDictionary(options, context);\n const preventCancel = options?.preventCancel;\n return { preventCancel: Boolean(preventCancel) };\n}\n","import { QueuingStrategyInit } from '../queuing-strategy';\nimport { assertDictionary, assertRequiredField, convertUnrestrictedDouble } from './basic';\n\nexport function convertQueuingStrategyInit(init: QueuingStrategyInit | null | undefined,\n context: string): QueuingStrategyInit {\n assertDictionary(init, context);\n const highWaterMark = init?.highWaterMark;\n assertRequiredField(highWaterMark, 'highWaterMark', 'QueuingStrategyInit');\n return {\n highWaterMark: convertUnrestrictedDouble(highWaterMark)\n };\n}\n","import { QueuingStrategy, QueuingStrategyInit } from './queuing-strategy';\nimport { typeIsObject } from './helpers/miscellaneous';\nimport { assertRequiredArgument } from './validators/basic';\nimport { convertQueuingStrategyInit } from './validators/queuing-strategy-init';\n\n// The size function must not have a prototype property nor be a constructor\nconst byteLengthSizeFunction = (chunk: ArrayBufferView): number => {\n return chunk.byteLength;\n};\ntry {\n Object.defineProperty(byteLengthSizeFunction, 'name', {\n value: 'size',\n configurable: true\n });\n} catch {\n // This property is non-configurable in older browsers, so ignore if this throws.\n // https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Function/name#browser_compatibility\n}\n\n/**\n * A queuing strategy that counts the number of bytes in each chunk.\n *\n * @public\n */\nexport default class ByteLengthQueuingStrategy implements QueuingStrategy<ArrayBufferView> {\n /** @internal */\n readonly _byteLengthQueuingStrategyHighWaterMark: number;\n\n constructor(options: QueuingStrategyInit) {\n assertRequiredArgument(options, 1, 'ByteLengthQueuingStrategy');\n options = convertQueuingStrategyInit(options, 'First parameter');\n this._byteLengthQueuingStrategyHighWaterMark = options.highWaterMark;\n }\n\n /**\n * Returns the high water mark provided to the constructor.\n */\n get highWaterMark(): number {\n if (!IsByteLengthQueuingStrategy(this)) {\n throw byteLengthBrandCheckException('highWaterMark');\n }\n return this._byteLengthQueuingStrategyHighWaterMark;\n }\n\n /**\n * Measures the size of `chunk` by returning the value of its `byteLength` property.\n */\n get size(): (chunk: ArrayBufferView) => number {\n if (!IsByteLengthQueuingStrategy(this)) {\n throw byteLengthBrandCheckException('size');\n }\n return byteLengthSizeFunction;\n }\n}\n\nObject.defineProperties(ByteLengthQueuingStrategy.prototype, {\n highWaterMark: { enumerable: true },\n size: { enumerable: true }\n});\nif (typeof Symbol.toStringTag === 'symbol') {\n Object.defineProperty(ByteLengthQueuingStrategy.prototype, Symbol.toStringTag, {\n value: 'ByteLengthQueuingStrategy',\n configurable: true\n });\n}\n\n// Helper functions for the ByteLengthQueuingStrategy.\n\nfunction byteLengthBrandCheckException(name: string): TypeError {\n return new TypeError(`ByteLengthQueuingStrategy.prototype.${name} can only be used on a ByteLengthQueuingStrategy`);\n}\n\nexport function IsByteLengthQueuingStrategy(x: any): x is ByteLengthQueuingStrategy {\n if (!typeIsObject(x)) {\n return false;\n }\n\n if (!Object.prototype.hasOwnProperty.call(x, '_byteLengthQueuingStrategyHighWaterMark')) {\n return false;\n }\n\n return x instanceof ByteLengthQueuingStrategy;\n}\n","import { QueuingStrategy, QueuingStrategyInit } from './queuing-strategy';\nimport { typeIsObject } from './helpers/miscellaneous';\nimport { assertRequiredArgument } from './validators/basic';\nimport { convertQueuingStrategyInit } from './validators/queuing-strategy-init';\n\n// The size function must not have a prototype property nor be a constructor\nconst countSizeFunction = (): 1 => {\n return 1;\n};\ntry {\n Object.defineProperty(countSizeFunction, 'name', {\n value: 'size',\n configurable: true\n });\n} catch {\n // This property is non-configurable in older browsers, so ignore if this throws.\n // https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Function/name#browser_compatibility\n}\n\n/**\n * A queuing strategy that counts the number of chunks.\n *\n * @public\n */\nexport default class CountQueuingStrategy implements QueuingStrategy<any> {\n /** @internal */\n readonly _countQueuingStrategyHighWaterMark!: number;\n\n constructor(options: QueuingStrategyInit) {\n assertRequiredArgument(options, 1, 'CountQueuingStrategy');\n options = convertQueuingStrategyInit(options, 'First parameter');\n this._countQueuingStrategyHighWaterMark = options.highWaterMark;\n }\n\n /**\n * Returns the high water mark provided to the constructor.\n */\n get highWaterMark(): number {\n if (!IsCountQueuingStrategy(this)) {\n throw countBrandCheckException('highWaterMark');\n }\n return this._countQueuingStrategyHighWaterMark;\n }\n\n /**\n * Measures the size of `chunk` by always returning 1.\n * This ensures that the total queue size is a count of the number of chunks in the queue.\n */\n get size(): (chunk: any) => 1 {\n if (!IsCountQueuingStrategy(this)) {\n throw countBrandCheckException('size');\n }\n return countSizeFunction;\n }\n}\n\nObject.defineProperties(CountQueuingStrategy.prototype, {\n highWaterMark: { enumerable: true },\n size: { enumerable: true }\n});\nif (typeof Symbol.toStringTag === 'symbol') {\n Object.defineProperty(CountQueuingStrategy.prototype, Symbol.toStringTag, {\n value: 'CountQueuingStrategy',\n configurable: true\n });\n}\n\n// Helper functions for the CountQueuingStrategy.\n\nfunction countBrandCheckException(name: string): TypeError {\n return new TypeError(`CountQueuingStrategy.prototype.${name} can only be used on a CountQueuingStrategy`);\n}\n\nexport function IsCountQueuingStrategy(x: any): x is CountQueuingStrategy {\n if (!typeIsObject(x)) {\n return false;\n }\n\n if (!Object.prototype.hasOwnProperty.call(x, '_countQueuingStrategyHighWaterMark')) {\n return false;\n }\n\n return x instanceof CountQueuingStrategy;\n}\n","import { assertDictionary, assertFunction } from './basic';\nimport { promiseCall, reflectCall } from '../helpers/webidl';\nimport {\n Transformer,\n TransformerFlushCallback,\n TransformerStartCallback,\n TransformerTransformCallback,\n ValidatedTransformer\n} from '../transform-stream/transformer';\nimport { TransformStreamDefaultController } from '../transform-stream';\n\nexport function convertTransformer<I, O>(original: Transformer<I, O> | null,\n context: string): ValidatedTransformer<I, O> {\n assertDictionary(original, context);\n const flush = original?.flush;\n const readableType = original?.readableType;\n const start = original?.start;\n const transform = original?.transform;\n const writableType = original?.writableType;\n return {\n flush: flush === undefined ?\n undefined :\n convertTransformerFlushCallback(flush, original!, `${context} has member 'flush' that`),\n readableType,\n start: start === undefined ?\n undefined :\n convertTransformerStartCallback(start, original!, `${context} has member 'start' that`),\n transform: transform === undefined ?\n undefined :\n convertTransformerTransformCallback(transform, original!, `${context} has member 'transform' that`),\n writableType\n };\n}\n\nfunction convertTransformerFlushCallback<I, O>(\n fn: TransformerFlushCallback<O>,\n original: Transformer<I, O>,\n context: string\n): (controller: TransformStreamDefaultController<O>) => Promise<void> {\n assertFunction(fn, context);\n return (controller: TransformStreamDefaultController<O>) => promiseCall(fn, original, [controller]);\n}\n\nfunction convertTransformerStartCallback<I, O>(\n fn: TransformerStartCallback<O>,\n original: Transformer<I, O>,\n context: string\n): TransformerStartCallback<O> {\n assertFunction(fn, context);\n return (controller: TransformStreamDefaultController<O>) => reflectCall(fn, original, [controller]);\n}\n\nfunction convertTransformerTransformCallback<I, O>(\n fn: TransformerTransformCallback<I, O>,\n original: Transformer<I, O>,\n context: string\n): (chunk: I, controller: TransformStreamDefaultController<O>) => Promise<void> {\n assertFunction(fn, context);\n return (chunk: I, controller: TransformStreamDefaultController<O>) => promiseCall(fn, original, [chunk, controller]);\n}\n","import assert from '../stub/assert';\nimport { newPromise, promiseRejectedWith, promiseResolvedWith, transformPromiseWith } from './helpers/webidl';\nimport { CreateReadableStream, ReadableStream, ReadableStreamDefaultController } from './readable-stream';\nimport {\n ReadableStreamDefaultControllerCanCloseOrEnqueue,\n ReadableStreamDefaultControllerClose,\n ReadableStreamDefaultControllerEnqueue,\n ReadableStreamDefaultControllerError,\n ReadableStreamDefaultControllerGetDesiredSize,\n ReadableStreamDefaultControllerHasBackpressure\n} from './readable-stream/default-controller';\nimport { QueuingStrategy, QueuingStrategySizeCallback } from './queuing-strategy';\nimport { CreateWritableStream, WritableStream, WritableStreamDefaultControllerErrorIfNeeded } from './writable-stream';\nimport { typeIsObject } from './helpers/miscellaneous';\nimport { IsNonNegativeNumber } from './abstract-ops/miscellaneous';\nimport { convertQueuingStrategy } from './validators/queuing-strategy';\nimport { ExtractHighWaterMark, ExtractSizeAlgorithm } from './abstract-ops/queuing-strategy';\nimport {\n Transformer,\n TransformerFlushCallback,\n TransformerStartCallback,\n TransformerTransformCallback,\n ValidatedTransformer\n} from './transform-stream/transformer';\nimport { convertTransformer } from './validators/transformer';\n\n// Class TransformStream\n\n/**\n * A transform stream consists of a pair of streams: a {@link WritableStream | writable stream},\n * known as its writable side, and a {@link ReadableStream | readable stream}, known as its readable side.\n * In a manner specific to the transform stream in question, writes to the writable side result in new data being\n * made available for reading from the readable side.\n *\n * @public\n */\nexport class TransformStream<I = any, O = any> {\n /** @internal */\n _writable!: WritableStream<I>;\n /** @internal */\n _readable!: ReadableStream<O>;\n /** @internal */\n _backpressure!: boolean;\n /** @internal */\n _backpressureChangePromise!: Promise<void>;\n /** @internal */\n _backpressureChangePromise_resolve!: () => void;\n /** @internal */\n _transformStreamController!: TransformStreamDefaultController<O>;\n\n constructor(\n transformer?: Transformer<I, O>,\n writableStrategy?: QueuingStrategy<I>,\n readableStrategy?: QueuingStrategy<O>\n );\n constructor(rawTransformer: Transformer<I, O> | null | undefined = {},\n rawWritableStrategy: QueuingStrategy<I> | null | undefined = {},\n rawReadableStrategy: QueuingStrategy<O> | null | undefined = {}) {\n if (rawTransformer === undefined) {\n rawTransformer = null;\n }\n\n const writableStrategy = convertQueuingStrategy(rawWritableStrategy, 'Second parameter');\n const readableStrategy = convertQueuingStrategy(rawReadableStrategy, 'Third parameter');\n\n const transformer = convertTransformer(rawTransformer, 'First parameter');\n if (transformer.readableType !== undefined) {\n throw new RangeError('Invalid readableType specified');\n }\n if (transformer.writableType !== undefined) {\n throw new RangeError('Invalid writableType specified');\n }\n\n const readableHighWaterMark = ExtractHighWaterMark(readableStrategy, 0);\n const readableSizeAlgorithm = ExtractSizeAlgorithm(readableStrategy);\n const writableHighWaterMark = ExtractHighWaterMark(writableStrategy, 1);\n const writableSizeAlgorithm = ExtractSizeAlgorithm(writableStrategy);\n\n let startPromise_resolve!: (value: void | PromiseLike<void>) => void;\n const startPromise = newPromise<void>(resolve => {\n startPromise_resolve = resolve;\n });\n\n InitializeTransformStream(\n this, startPromise, writableHighWaterMark, writableSizeAlgorithm, readableHighWaterMark, readableSizeAlgorithm\n );\n SetUpTransformStreamDefaultControllerFromTransformer(this, transformer);\n\n if (transformer.start !== undefined) {\n startPromise_resolve(transformer.start(this._transformStreamController));\n } else {\n startPromise_resolve(undefined);\n }\n }\n\n /**\n * The readable side of the transform stream.\n */\n get readable(): ReadableStream<O> {\n if (!IsTransformStream(this)) {\n throw streamBrandCheckException('readable');\n }\n\n return this._readable;\n }\n\n /**\n * The writable side of the transform stream.\n */\n get writable(): WritableStream<I> {\n if (!IsTransformStream(this)) {\n throw streamBrandCheckException('writable');\n }\n\n return this._writable;\n }\n}\n\nObject.defineProperties(TransformStream.prototype, {\n readable: { enumerable: true },\n writable: { enumerable: true }\n});\nif (typeof Symbol.toStringTag === 'symbol') {\n Object.defineProperty(TransformStream.prototype, Symbol.toStringTag, {\n value: 'TransformStream',\n configurable: true\n });\n}\n\nexport {\n Transformer,\n TransformerStartCallback,\n TransformerFlushCallback,\n TransformerTransformCallback\n};\n\n// Transform Stream Abstract Operations\n\nexport function CreateTransformStream<I, O>(startAlgorithm: () => void | PromiseLike<void>,\n transformAlgorithm: (chunk: I) => Promise<void>,\n flushAlgorithm: () => Promise<void>,\n writableHighWaterMark = 1,\n writableSizeAlgorithm: QueuingStrategySizeCallback<I> = () => 1,\n readableHighWaterMark = 0,\n readableSizeAlgorithm: QueuingStrategySizeCallback<O> = () => 1) {\n assert(IsNonNegativeNumber(writableHighWaterMark));\n assert(IsNonNegativeNumber(readableHighWaterMark));\n\n const stream: TransformStream<I, O> = Object.create(TransformStream.prototype);\n\n let startPromise_resolve!: (value: void | PromiseLike<void>) => void;\n const startPromise = newPromise<void>(resolve => {\n startPromise_resolve = resolve;\n });\n\n InitializeTransformStream(stream, startPromise, writableHighWaterMark, writableSizeAlgorithm, readableHighWaterMark,\n readableSizeAlgorithm);\n\n const controller: TransformStreamDefaultController<O> = Object.create(TransformStreamDefaultController.prototype);\n\n SetUpTransformStreamDefaultController(stream, controller, transformAlgorithm, flushAlgorithm);\n\n const startResult = startAlgorithm();\n startPromise_resolve(startResult);\n return stream;\n}\n\nfunction InitializeTransformStream<I, O>(stream: TransformStream<I, O>,\n startPromise: Promise<void>,\n writableHighWaterMark: number,\n writableSizeAlgorithm: QueuingStrategySizeCallback<I>,\n readableHighWaterMark: number,\n readableSizeAlgorithm: QueuingStrategySizeCallback<O>) {\n function startAlgorithm(): Promise<void> {\n return startPromise;\n }\n\n function writeAlgorithm(chunk: I): Promise<void> {\n return TransformStreamDefaultSinkWriteAlgorithm(stream, chunk);\n }\n\n function abortAlgorithm(reason: any): Promise<void> {\n return TransformStreamDefaultSinkAbortAlgorithm(stream, reason);\n }\n\n function closeAlgorithm(): Promise<void> {\n return TransformStreamDefaultSinkCloseAlgorithm(stream);\n }\n\n stream._writable = CreateWritableStream(startAlgorithm, writeAlgorithm, closeAlgorithm, abortAlgorithm,\n writableHighWaterMark, writableSizeAlgorithm);\n\n function pullAlgorithm(): Promise<void> {\n return TransformStreamDefaultSourcePullAlgorithm(stream);\n }\n\n function cancelAlgorithm(reason: any): Promise<void> {\n TransformStreamErrorWritableAndUnblockWrite(stream, reason);\n return promiseResolvedWith(undefined);\n }\n\n stream._readable = CreateReadableStream(startAlgorithm, pullAlgorithm, cancelAlgorithm, readableHighWaterMark,\n readableSizeAlgorithm);\n\n // The [[backpressure]] slot is set to undefined so that it can be initialised by TransformStreamSetBackpressure.\n stream._backpressure = undefined!;\n stream._backpressureChangePromise = undefined!;\n stream._backpressureChangePromise_resolve = undefined!;\n TransformStreamSetBackpressure(stream, true);\n\n stream._transformStreamController = undefined!;\n}\n\nfunction IsTransformStream(x: unknown): x is TransformStream {\n if (!typeIsObject(x)) {\n return false;\n }\n\n if (!Object.prototype.hasOwnProperty.call(x, '_transformStreamController')) {\n return false;\n }\n\n return x instanceof TransformStream;\n}\n\n// This is a no-op if both sides are already errored.\nfunction TransformStreamError(stream: TransformStream, e: any) {\n ReadableStreamDefaultControllerError(\n stream._readable._readableStreamController as ReadableStreamDefaultController<any>,\n e\n );\n TransformStreamErrorWritableAndUnblockWrite(stream, e);\n}\n\nfunction TransformStreamErrorWritableAndUnblockWrite(stream: TransformStream, e: any) {\n TransformStreamDefaultControllerClearAlgorithms(stream._transformStreamController);\n WritableStreamDefaultControllerErrorIfNeeded(stream._writable._writableStreamController, e);\n if (stream._backpressure) {\n // Pretend that pull() was called to permit any pending write() calls to complete. TransformStreamSetBackpressure()\n // cannot be called from enqueue() or pull() once the ReadableStream is errored, so this will will be the final time\n // _backpressure is set.\n TransformStreamSetBackpressure(stream, false);\n }\n}\n\nfunction TransformStreamSetBackpressure(stream: TransformStream, backpressure: boolean) {\n // Passes also when called during construction.\n assert(stream._backpressure !== backpressure);\n\n if (stream._backpressureChangePromise !== undefined) {\n stream._backpressureChangePromise_resolve();\n }\n\n stream._backpressureChangePromise = newPromise(resolve => {\n stream._backpressureChangePromise_resolve = resolve;\n });\n\n stream._backpressure = backpressure;\n}\n\n// Class TransformStreamDefaultController\n\n/**\n * Allows control of the {@link ReadableStream} and {@link WritableStream} of the associated {@link TransformStream}.\n *\n * @public\n */\nexport class TransformStreamDefaultController<O> {\n /** @internal */\n _controlledTransformStream: TransformStream<any, O>;\n /** @internal */\n _transformAlgorithm: (chunk: any) => Promise<void>;\n /** @internal */\n _flushAlgorithm: () => Promise<void>;\n\n private constructor() {\n throw new TypeError('Illegal constructor');\n }\n\n /**\n * Returns the desired size to fill the readable side’s internal queue. It can be negative, if the queue is over-full.\n */\n get desiredSize(): number | null {\n if (!IsTransformStreamDefaultController(this)) {\n throw defaultControllerBrandCheckException('desiredSize');\n }\n\n const readableController = this._controlledTransformStream._readable._readableStreamController;\n return ReadableStreamDefaultControllerGetDesiredSize(readableController as ReadableStreamDefaultController<O>);\n }\n\n /**\n * Enqueues the given chunk `chunk` in the readable side of the controlled transform stream.\n */\n enqueue(chunk: O): void;\n enqueue(chunk: O = undefined!): void {\n if (!IsTransformStreamDefaultController(this)) {\n throw defaultControllerBrandCheckException('enqueue');\n }\n\n TransformStreamDefaultControllerEnqueue(this, chunk);\n }\n\n /**\n * Errors both the readable side and the writable side of the controlled transform stream, making all future\n * interactions with it fail with the given error `e`. Any chunks queued for transformation will be discarded.\n */\n error(reason: any = undefined): void {\n if (!IsTransformStreamDefaultController(this)) {\n throw defaultControllerBrandCheckException('error');\n }\n\n TransformStreamDefaultControllerError(this, reason);\n }\n\n /**\n * Closes the readable side and errors the writable side of the controlled transform stream. This is useful when the\n * transformer only needs to consume a portion of the chunks written to the writable side.\n */\n terminate(): void {\n if (!IsTransformStreamDefaultController(this)) {\n throw defaultControllerBrandCheckException('terminate');\n }\n\n TransformStreamDefaultControllerTerminate(this);\n }\n}\n\nObject.defineProperties(TransformStreamDefaultController.prototype, {\n enqueue: { enumerable: true },\n error: { enumerable: true },\n terminate: { enumerable: true },\n desiredSize: { enumerable: true }\n});\nif (typeof Symbol.toStringTag === 'symbol') {\n Object.defineProperty(TransformStreamDefaultController.prototype, Symbol.toStringTag, {\n value: 'TransformStreamDefaultController',\n configurable: true\n });\n}\n\n// Transform Stream Default Controller Abstract Operations\n\nfunction IsTransformStreamDefaultController<O = any>(x: any): x is TransformStreamDefaultController<O> {\n if (!typeIsObject(x)) {\n return false;\n }\n\n if (!Object.prototype.hasOwnProperty.call(x, '_controlledTransformStream')) {\n return false;\n }\n\n return x instanceof TransformStreamDefaultController;\n}\n\nfunction SetUpTransformStreamDefaultController<I, O>(stream: TransformStream<I, O>,\n controller: TransformStreamDefaultController<O>,\n transformAlgorithm: (chunk: I) => Promise<void>,\n flushAlgorithm: () => Promise<void>) {\n assert(IsTransformStream(stream));\n assert(stream._transformStreamController === undefined);\n\n controller._controlledTransformStream = stream;\n stream._transformStreamController = controller;\n\n controller._transformAlgorithm = transformAlgorithm;\n controller._flushAlgorithm = flushAlgorithm;\n}\n\nfunction SetUpTransformStreamDefaultControllerFromTransformer<I, O>(stream: TransformStream<I, O>,\n transformer: ValidatedTransformer<I, O>) {\n const controller: TransformStreamDefaultController<O> = Object.create(TransformStreamDefaultController.prototype);\n\n let transformAlgorithm = (chunk: I): Promise<void> => {\n try {\n TransformStreamDefaultControllerEnqueue(controller, chunk as unknown as O);\n return promiseResolvedWith(undefined);\n } catch (transformResultE) {\n return promiseRejectedWith(transformResultE);\n }\n };\n\n let flushAlgorithm: () => Promise<void> = () => promiseResolvedWith(undefined);\n\n if (transformer.transform !== undefined) {\n transformAlgorithm = chunk => transformer.transform!(chunk, controller);\n }\n if (transformer.flush !== undefined) {\n flushAlgorithm = () => transformer.flush!(controller);\n }\n\n SetUpTransformStreamDefaultController(stream, controller, transformAlgorithm, flushAlgorithm);\n}\n\nfunction TransformStreamDefaultControllerClearAlgorithms(controller: TransformStreamDefaultController<any>) {\n controller._transformAlgorithm = undefined!;\n controller._flushAlgorithm = undefined!;\n}\n\nfunction TransformStreamDefaultControllerEnqueue<O>(controller: TransformStreamDefaultController<O>, chunk: O) {\n const stream = controller._controlledTransformStream;\n const readableController = stream._readable._readableStreamController as ReadableStreamDefaultController<O>;\n if (!ReadableStreamDefaultControllerCanCloseOrEnqueue(readableController)) {\n throw new TypeError('Readable side is not in a state that permits enqueue');\n }\n\n // We throttle transform invocations based on the backpressure of the ReadableStream, but we still\n // accept TransformStreamDefaultControllerEnqueue() calls.\n\n try {\n ReadableStreamDefaultControllerEnqueue(readableController, chunk);\n } catch (e) {\n // This happens when readableStrategy.size() throws.\n TransformStreamErrorWritableAndUnblockWrite(stream, e);\n\n throw stream._readable._storedError;\n }\n\n const backpressure = ReadableStreamDefaultControllerHasBackpressure(readableController);\n if (backpressure !== stream._backpressure) {\n assert(backpressure);\n TransformStreamSetBackpressure(stream, true);\n }\n}\n\nfunction TransformStreamDefaultControllerError(controller: TransformStreamDefaultController<any>, e: any) {\n TransformStreamError(controller._controlledTransformStream, e);\n}\n\nfunction TransformStreamDefaultControllerPerformTransform<I, O>(controller: TransformStreamDefaultController<O>,\n chunk: I) {\n const transformPromise = controller._transformAlgorithm(chunk);\n return transformPromiseWith(transformPromise, undefined, r => {\n TransformStreamError(controller._controlledTransformStream, r);\n throw r;\n });\n}\n\nfunction TransformStreamDefaultControllerTerminate<O>(controller: TransformStreamDefaultController<O>) {\n const stream = controller._controlledTransformStream;\n const readableController = stream._readable._readableStreamController as ReadableStreamDefaultController<O>;\n\n ReadableStreamDefaultControllerClose(readableController);\n\n const error = new TypeError('TransformStream terminated');\n TransformStreamErrorWritableAndUnblockWrite(stream, error);\n}\n\n// TransformStreamDefaultSink Algorithms\n\nfunction TransformStreamDefaultSinkWriteAlgorithm<I, O>(stream: TransformStream<I, O>, chunk: I): Promise<void> {\n assert(stream._writable._state === 'writable');\n\n const controller = stream._transformStreamController;\n\n if (stream._backpressure) {\n const backpressureChangePromise = stream._backpressureChangePromise;\n assert(backpressureChangePromise !== undefined);\n return transformPromiseWith(backpressureChangePromise, () => {\n const writable = stream._writable;\n const state = writable._state;\n if (state === 'erroring') {\n throw writable._storedError;\n }\n assert(state === 'writable');\n return TransformStreamDefaultControllerPerformTransform<I, O>(controller, chunk);\n });\n }\n\n return TransformStreamDefaultControllerPerformTransform<I, O>(controller, chunk);\n}\n\nfunction TransformStreamDefaultSinkAbortAlgorithm(stream: TransformStream, reason: any): Promise<void> {\n // abort() is not called synchronously, so it is possible for abort() to be called when the stream is already\n // errored.\n TransformStreamError(stream, reason);\n return promiseResolvedWith(undefined);\n}\n\nfunction TransformStreamDefaultSinkCloseAlgorithm<I, O>(stream: TransformStream<I, O>): Promise<void> {\n // stream._readable cannot change after construction, so caching it across a call to user code is safe.\n const readable = stream._readable;\n\n const controller = stream._transformStreamController;\n const flushPromise = controller._flushAlgorithm();\n TransformStreamDefaultControllerClearAlgorithms(controller);\n\n // Return a promise that is fulfilled with undefined on success.\n return transformPromiseWith(flushPromise, () => {\n if (readable._state === 'errored') {\n throw readable._storedError;\n }\n ReadableStreamDefaultControllerClose(readable._readableStreamController as ReadableStreamDefaultController<O>);\n }, r => {\n TransformStreamError(stream, r);\n throw readable._storedError;\n });\n}\n\n// TransformStreamDefaultSource Algorithms\n\nfunction TransformStreamDefaultSourcePullAlgorithm(stream: TransformStream): Promise<void> {\n // Invariant. 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