/**
* web-streams-polyfill v3.2.1
*/
(function (global, factory) {
typeof exports === 'object' && typeof module !== 'undefined' ? factory(exports) :
typeof define === 'function' && define.amd ? define(['exports'], factory) :
(global = typeof globalThis !== 'undefined' ? globalThis : global || self, factory(global.WebStreamsPolyfill = {}));
}(this, (function (exports) { 'use strict';
///
const SymbolPolyfill = typeof Symbol === 'function' && typeof Symbol.iterator === 'symbol' ?
Symbol :
description => `Symbol(${description})`;
///
function noop() {
return undefined;
}
function getGlobals() {
if (typeof self !== 'undefined') {
return self;
}
else if (typeof window !== 'undefined') {
return window;
}
else if (typeof global !== 'undefined') {
return global;
}
return undefined;
}
const globals = getGlobals();
function typeIsObject(x) {
return (typeof x === 'object' && x !== null) || typeof x === 'function';
}
const rethrowAssertionErrorRejection = noop;
const originalPromise = Promise;
const originalPromiseThen = Promise.prototype.then;
const originalPromiseResolve = Promise.resolve.bind(originalPromise);
const originalPromiseReject = Promise.reject.bind(originalPromise);
function newPromise(executor) {
return new originalPromise(executor);
}
function promiseResolvedWith(value) {
return originalPromiseResolve(value);
}
function promiseRejectedWith(reason) {
return originalPromiseReject(reason);
}
function PerformPromiseThen(promise, onFulfilled, onRejected) {
// There doesn't appear to be any way to correctly emulate the behaviour from JavaScript, so this is just an
// approximation.
return originalPromiseThen.call(promise, onFulfilled, onRejected);
}
function uponPromise(promise, onFulfilled, onRejected) {
PerformPromiseThen(PerformPromiseThen(promise, onFulfilled, onRejected), undefined, rethrowAssertionErrorRejection);
}
function uponFulfillment(promise, onFulfilled) {
uponPromise(promise, onFulfilled);
}
function uponRejection(promise, onRejected) {
uponPromise(promise, undefined, onRejected);
}
function transformPromiseWith(promise, fulfillmentHandler, rejectionHandler) {
return PerformPromiseThen(promise, fulfillmentHandler, rejectionHandler);
}
function setPromiseIsHandledToTrue(promise) {
PerformPromiseThen(promise, undefined, rethrowAssertionErrorRejection);
}
const queueMicrotask = (() => {
const globalQueueMicrotask = globals && globals.queueMicrotask;
if (typeof globalQueueMicrotask === 'function') {
return globalQueueMicrotask;
}
const resolvedPromise = promiseResolvedWith(undefined);
return (fn) => PerformPromiseThen(resolvedPromise, fn);
})();
function reflectCall(F, V, args) {
if (typeof F !== 'function') {
throw new TypeError('Argument is not a function');
}
return Function.prototype.apply.call(F, V, args);
}
function promiseCall(F, V, args) {
try {
return promiseResolvedWith(reflectCall(F, V, args));
}
catch (value) {
return promiseRejectedWith(value);
}
}
// Original from Chromium
// https://chromium.googlesource.com/chromium/src/+/0aee4434a4dba42a42abaea9bfbc0cd196a63bc1/third_party/blink/renderer/core/streams/SimpleQueue.js
const QUEUE_MAX_ARRAY_SIZE = 16384;
/**
* Simple queue structure.
*
* Avoids scalability issues with using a packed array directly by using
* multiple arrays in a linked list and keeping the array size bounded.
*/
class SimpleQueue {
constructor() {
this._cursor = 0;
this._size = 0;
// _front and _back are always defined.
this._front = {
_elements: [],
_next: undefined
};
this._back = this._front;
// The cursor is used to avoid calling Array.shift().
// It contains the index of the front element of the array inside the
// front-most node. It is always in the range [0, QUEUE_MAX_ARRAY_SIZE).
this._cursor = 0;
// When there is only one node, size === elements.length - cursor.
this._size = 0;
}
get length() {
return this._size;
}
// For exception safety, this method is structured in order:
// 1. Read state
// 2. Calculate required state mutations
// 3. Perform state mutations
push(element) {
const oldBack = this._back;
let newBack = oldBack;
if (oldBack._elements.length === QUEUE_MAX_ARRAY_SIZE - 1) {
newBack = {
_elements: [],
_next: undefined
};
}
// push() is the mutation most likely to throw an exception, so it
// goes first.
oldBack._elements.push(element);
if (newBack !== oldBack) {
this._back = newBack;
oldBack._next = newBack;
}
++this._size;
}
// Like push(), shift() follows the read -> calculate -> mutate pattern for
// exception safety.
shift() { // must not be called on an empty queue
const oldFront = this._front;
let newFront = oldFront;
const oldCursor = this._cursor;
let newCursor = oldCursor + 1;
const elements = oldFront._elements;
const element = elements[oldCursor];
if (newCursor === QUEUE_MAX_ARRAY_SIZE) {
newFront = oldFront._next;
newCursor = 0;
}
// No mutations before this point.
--this._size;
this._cursor = newCursor;
if (oldFront !== newFront) {
this._front = newFront;
}
// Permit shifted element to be garbage collected.
elements[oldCursor] = undefined;
return element;
}
// The tricky thing about forEach() is that it can be called
// re-entrantly. The queue may be mutated inside the callback. It is easy to
// see that push() within the callback has no negative effects since the end
// of the queue is checked for on every iteration. If shift() is called
// repeatedly within the callback then the next iteration may return an
// element that has been removed. In this case the callback will be called
// with undefined values until we either "catch up" with elements that still
// exist or reach the back of the queue.
forEach(callback) {
let i = this._cursor;
let node = this._front;
let elements = node._elements;
while (i !== elements.length || node._next !== undefined) {
if (i === elements.length) {
node = node._next;
elements = node._elements;
i = 0;
if (elements.length === 0) {
break;
}
}
callback(elements[i]);
++i;
}
}
// Return the element that would be returned if shift() was called now,
// without modifying the queue.
peek() { // must not be called on an empty queue
const front = this._front;
const cursor = this._cursor;
return front._elements[cursor];
}
}
function ReadableStreamReaderGenericInitialize(reader, stream) {
reader._ownerReadableStream = stream;
stream._reader = reader;
if (stream._state === 'readable') {
defaultReaderClosedPromiseInitialize(reader);
}
else if (stream._state === 'closed') {
defaultReaderClosedPromiseInitializeAsResolved(reader);
}
else {
defaultReaderClosedPromiseInitializeAsRejected(reader, stream._storedError);
}
}
// A client of ReadableStreamDefaultReader and ReadableStreamBYOBReader may use these functions directly to bypass state
// check.
function ReadableStreamReaderGenericCancel(reader, reason) {
const stream = reader._ownerReadableStream;
return ReadableStreamCancel(stream, reason);
}
function ReadableStreamReaderGenericRelease(reader) {
if (reader._ownerReadableStream._state === 'readable') {
defaultReaderClosedPromiseReject(reader, new TypeError(`Reader was released and can no longer be used to monitor the stream's closedness`));
}
else {
defaultReaderClosedPromiseResetToRejected(reader, new TypeError(`Reader was released and can no longer be used to monitor the stream's closedness`));
}
reader._ownerReadableStream._reader = undefined;
reader._ownerReadableStream = undefined;
}
// Helper functions for the readers.
function readerLockException(name) {
return new TypeError('Cannot ' + name + ' a stream using a released reader');
}
// Helper functions for the ReadableStreamDefaultReader.
function defaultReaderClosedPromiseInitialize(reader) {
reader._closedPromise = newPromise((resolve, reject) => {
reader._closedPromise_resolve = resolve;
reader._closedPromise_reject = reject;
});
}
function defaultReaderClosedPromiseInitializeAsRejected(reader, reason) {
defaultReaderClosedPromiseInitialize(reader);
defaultReaderClosedPromiseReject(reader, reason);
}
function defaultReaderClosedPromiseInitializeAsResolved(reader) {
defaultReaderClosedPromiseInitialize(reader);
defaultReaderClosedPromiseResolve(reader);
}
function defaultReaderClosedPromiseReject(reader, reason) {
if (reader._closedPromise_reject === undefined) {
return;
}
setPromiseIsHandledToTrue(reader._closedPromise);
reader._closedPromise_reject(reason);
reader._closedPromise_resolve = undefined;
reader._closedPromise_reject = undefined;
}
function defaultReaderClosedPromiseResetToRejected(reader, reason) {
defaultReaderClosedPromiseInitializeAsRejected(reader, reason);
}
function defaultReaderClosedPromiseResolve(reader) {
if (reader._closedPromise_resolve === undefined) {
return;
}
reader._closedPromise_resolve(undefined);
reader._closedPromise_resolve = undefined;
reader._closedPromise_reject = undefined;
}
const AbortSteps = SymbolPolyfill('[[AbortSteps]]');
const ErrorSteps = SymbolPolyfill('[[ErrorSteps]]');
const CancelSteps = SymbolPolyfill('[[CancelSteps]]');
const PullSteps = SymbolPolyfill('[[PullSteps]]');
///
// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Number/isFinite#Polyfill
const NumberIsFinite = Number.isFinite || function (x) {
return typeof x === 'number' && isFinite(x);
};
///
// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Math/trunc#Polyfill
const MathTrunc = Math.trunc || function (v) {
return v < 0 ? Math.ceil(v) : Math.floor(v);
};
// https://heycam.github.io/webidl/#idl-dictionaries
function isDictionary(x) {
return typeof x === 'object' || typeof x === 'function';
}
function assertDictionary(obj, context) {
if (obj !== undefined && !isDictionary(obj)) {
throw new TypeError(`${context} is not an object.`);
}
}
// https://heycam.github.io/webidl/#idl-callback-functions
function assertFunction(x, context) {
if (typeof x !== 'function') {
throw new TypeError(`${context} is not a function.`);
}
}
// https://heycam.github.io/webidl/#idl-object
function isObject(x) {
return (typeof x === 'object' && x !== null) || typeof x === 'function';
}
function assertObject(x, context) {
if (!isObject(x)) {
throw new TypeError(`${context} is not an object.`);
}
}
function assertRequiredArgument(x, position, context) {
if (x === undefined) {
throw new TypeError(`Parameter ${position} is required in '${context}'.`);
}
}
function assertRequiredField(x, field, context) {
if (x === undefined) {
throw new TypeError(`${field} is required in '${context}'.`);
}
}
// https://heycam.github.io/webidl/#idl-unrestricted-double
function convertUnrestrictedDouble(value) {
return Number(value);
}
function censorNegativeZero(x) {
return x === 0 ? 0 : x;
}
function integerPart(x) {
return censorNegativeZero(MathTrunc(x));
}
// https://heycam.github.io/webidl/#idl-unsigned-long-long
function convertUnsignedLongLongWithEnforceRange(value, context) {
const lowerBound = 0;
const upperBound = Number.MAX_SAFE_INTEGER;
let x = Number(value);
x = censorNegativeZero(x);
if (!NumberIsFinite(x)) {
throw new TypeError(`${context} is not a finite number`);
}
x = integerPart(x);
if (x < lowerBound || x > upperBound) {
throw new TypeError(`${context} is outside the accepted range of ${lowerBound} to ${upperBound}, inclusive`);
}
if (!NumberIsFinite(x) || x === 0) {
return 0;
}
// TODO Use BigInt if supported?
// let xBigInt = BigInt(integerPart(x));
// xBigInt = BigInt.asUintN(64, xBigInt);
// return Number(xBigInt);
return x;
}
function assertReadableStream(x, context) {
if (!IsReadableStream(x)) {
throw new TypeError(`${context} is not a ReadableStream.`);
}
}
// Abstract operations for the ReadableStream.
function AcquireReadableStreamDefaultReader(stream) {
return new ReadableStreamDefaultReader(stream);
}
// ReadableStream API exposed for controllers.
function ReadableStreamAddReadRequest(stream, readRequest) {
stream._reader._readRequests.push(readRequest);
}
function ReadableStreamFulfillReadRequest(stream, chunk, done) {
const reader = stream._reader;
const readRequest = reader._readRequests.shift();
if (done) {
readRequest._closeSteps();
}
else {
readRequest._chunkSteps(chunk);
}
}
function ReadableStreamGetNumReadRequests(stream) {
return stream._reader._readRequests.length;
}
function ReadableStreamHasDefaultReader(stream) {
const reader = stream._reader;
if (reader === undefined) {
return false;
}
if (!IsReadableStreamDefaultReader(reader)) {
return false;
}
return true;
}
/**
* A default reader vended by a {@link ReadableStream}.
*
* @public
*/
class ReadableStreamDefaultReader {
constructor(stream) {
assertRequiredArgument(stream, 1, 'ReadableStreamDefaultReader');
assertReadableStream(stream, 'First parameter');
if (IsReadableStreamLocked(stream)) {
throw new TypeError('This stream has already been locked for exclusive reading by another reader');
}
ReadableStreamReaderGenericInitialize(this, stream);
this._readRequests = new SimpleQueue();
}
/**
* Returns a promise that will be fulfilled when the stream becomes closed,
* or rejected if the stream ever errors or the reader's lock is released before the stream finishes closing.
*/
get closed() {
if (!IsReadableStreamDefaultReader(this)) {
return promiseRejectedWith(defaultReaderBrandCheckException('closed'));
}
return this._closedPromise;
}
/**
* If the reader is active, behaves the same as {@link ReadableStream.cancel | stream.cancel(reason)}.
*/
cancel(reason = undefined) {
if (!IsReadableStreamDefaultReader(this)) {
return promiseRejectedWith(defaultReaderBrandCheckException('cancel'));
}
if (this._ownerReadableStream === undefined) {
return promiseRejectedWith(readerLockException('cancel'));
}
return ReadableStreamReaderGenericCancel(this, reason);
}
/**
* Returns a promise that allows access to the next chunk from the stream's internal queue, if available.
*
* If reading a chunk causes the queue to become empty, more data will be pulled from the underlying source.
*/
read() {
if (!IsReadableStreamDefaultReader(this)) {
return promiseRejectedWith(defaultReaderBrandCheckException('read'));
}
if (this._ownerReadableStream === undefined) {
return promiseRejectedWith(readerLockException('read from'));
}
let resolvePromise;
let rejectPromise;
const promise = newPromise((resolve, reject) => {
resolvePromise = resolve;
rejectPromise = reject;
});
const readRequest = {
_chunkSteps: chunk => resolvePromise({ value: chunk, done: false }),
_closeSteps: () => resolvePromise({ value: undefined, done: true }),
_errorSteps: e => rejectPromise(e)
};
ReadableStreamDefaultReaderRead(this, readRequest);
return promise;
}
/**
* Releases the reader's lock on the corresponding stream. After the lock is released, the reader is no longer active.
* If the associated stream is errored when the lock is released, the reader will appear errored in the same way
* from now on; otherwise, the reader will appear closed.
*
* A reader's lock cannot be released while it still has a pending read request, i.e., if a promise returned by
* the reader's {@link ReadableStreamDefaultReader.read | read()} method has not yet been settled. Attempting to
* do so will throw a `TypeError` and leave the reader locked to the stream.
*/
releaseLock() {
if (!IsReadableStreamDefaultReader(this)) {
throw defaultReaderBrandCheckException('releaseLock');
}
if (this._ownerReadableStream === undefined) {
return;
}
if (this._readRequests.length > 0) {
throw new TypeError('Tried to release a reader lock when that reader has pending read() calls un-settled');
}
ReadableStreamReaderGenericRelease(this);
}
}
Object.defineProperties(ReadableStreamDefaultReader.prototype, {
cancel: { enumerable: true },
read: { enumerable: true },
releaseLock: { enumerable: true },
closed: { enumerable: true }
});
if (typeof SymbolPolyfill.toStringTag === 'symbol') {
Object.defineProperty(ReadableStreamDefaultReader.prototype, SymbolPolyfill.toStringTag, {
value: 'ReadableStreamDefaultReader',
configurable: true
});
}
// Abstract operations for the readers.
function IsReadableStreamDefaultReader(x) {
if (!typeIsObject(x)) {
return false;
}
if (!Object.prototype.hasOwnProperty.call(x, '_readRequests')) {
return false;
}
return x instanceof ReadableStreamDefaultReader;
}
function ReadableStreamDefaultReaderRead(reader, readRequest) {
const stream = reader._ownerReadableStream;
stream._disturbed = true;
if (stream._state === 'closed') {
readRequest._closeSteps();
}
else if (stream._state === 'errored') {
readRequest._errorSteps(stream._storedError);
}
else {
stream._readableStreamController[PullSteps](readRequest);
}
}
// Helper functions for the ReadableStreamDefaultReader.
function defaultReaderBrandCheckException(name) {
return new TypeError(`ReadableStreamDefaultReader.prototype.${name} can only be used on a ReadableStreamDefaultReader`);
}
///
/* eslint-disable @typescript-eslint/no-empty-function */
const AsyncIteratorPrototype = Object.getPrototypeOf(Object.getPrototypeOf(async function* () { }).prototype);
///
class ReadableStreamAsyncIteratorImpl {
constructor(reader, preventCancel) {
this._ongoingPromise = undefined;
this._isFinished = false;
this._reader = reader;
this._preventCancel = preventCancel;
}
next() {
const nextSteps = () => this._nextSteps();
this._ongoingPromise = this._ongoingPromise ?
transformPromiseWith(this._ongoingPromise, nextSteps, nextSteps) :
nextSteps();
return this._ongoingPromise;
}
return(value) {
const returnSteps = () => this._returnSteps(value);
return this._ongoingPromise ?
transformPromiseWith(this._ongoingPromise, returnSteps, returnSteps) :
returnSteps();
}
_nextSteps() {
if (this._isFinished) {
return Promise.resolve({ value: undefined, done: true });
}
const reader = this._reader;
if (reader._ownerReadableStream === undefined) {
return promiseRejectedWith(readerLockException('iterate'));
}
let resolvePromise;
let rejectPromise;
const promise = newPromise((resolve, reject) => {
resolvePromise = resolve;
rejectPromise = reject;
});
const readRequest = {
_chunkSteps: chunk => {
this._ongoingPromise = undefined;
// This needs to be delayed by one microtask, otherwise we stop pulling too early which breaks a test.
// FIXME Is this a bug in the specification, or in the test?
queueMicrotask(() => resolvePromise({ value: chunk, done: false }));
},
_closeSteps: () => {
this._ongoingPromise = undefined;
this._isFinished = true;
ReadableStreamReaderGenericRelease(reader);
resolvePromise({ value: undefined, done: true });
},
_errorSteps: reason => {
this._ongoingPromise = undefined;
this._isFinished = true;
ReadableStreamReaderGenericRelease(reader);
rejectPromise(reason);
}
};
ReadableStreamDefaultReaderRead(reader, readRequest);
return promise;
}
_returnSteps(value) {
if (this._isFinished) {
return Promise.resolve({ value, done: true });
}
this._isFinished = true;
const reader = this._reader;
if (reader._ownerReadableStream === undefined) {
return promiseRejectedWith(readerLockException('finish iterating'));
}
if (!this._preventCancel) {
const result = ReadableStreamReaderGenericCancel(reader, value);
ReadableStreamReaderGenericRelease(reader);
return transformPromiseWith(result, () => ({ value, done: true }));
}
ReadableStreamReaderGenericRelease(reader);
return promiseResolvedWith({ value, done: true });
}
}
const ReadableStreamAsyncIteratorPrototype = {
next() {
if (!IsReadableStreamAsyncIterator(this)) {
return promiseRejectedWith(streamAsyncIteratorBrandCheckException('next'));
}
return this._asyncIteratorImpl.next();
},
return(value) {
if (!IsReadableStreamAsyncIterator(this)) {
return promiseRejectedWith(streamAsyncIteratorBrandCheckException('return'));
}
return this._asyncIteratorImpl.return(value);
}
};
if (AsyncIteratorPrototype !== undefined) {
Object.setPrototypeOf(ReadableStreamAsyncIteratorPrototype, AsyncIteratorPrototype);
}
// Abstract operations for the ReadableStream.
function AcquireReadableStreamAsyncIterator(stream, preventCancel) {
const reader = AcquireReadableStreamDefaultReader(stream);
const impl = new ReadableStreamAsyncIteratorImpl(reader, preventCancel);
const iterator = Object.create(ReadableStreamAsyncIteratorPrototype);
iterator._asyncIteratorImpl = impl;
return iterator;
}
function IsReadableStreamAsyncIterator(x) {
if (!typeIsObject(x)) {
return false;
}
if (!Object.prototype.hasOwnProperty.call(x, '_asyncIteratorImpl')) {
return false;
}
try {
// noinspection SuspiciousTypeOfGuard
return x._asyncIteratorImpl instanceof
ReadableStreamAsyncIteratorImpl;
}
catch (_a) {
return false;
}
}
// Helper functions for the ReadableStream.
function streamAsyncIteratorBrandCheckException(name) {
return new TypeError(`ReadableStreamAsyncIterator.${name} can only be used on a ReadableSteamAsyncIterator`);
}
///
// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Number/isNaN#Polyfill
const NumberIsNaN = Number.isNaN || function (x) {
// eslint-disable-next-line no-self-compare
return x !== x;
};
function CreateArrayFromList(elements) {
// We use arrays to represent lists, so this is basically a no-op.
// Do a slice though just in case we happen to depend on the unique-ness.
return elements.slice();
}
function CopyDataBlockBytes(dest, destOffset, src, srcOffset, n) {
new Uint8Array(dest).set(new Uint8Array(src, srcOffset, n), destOffset);
}
// Not implemented correctly
function TransferArrayBuffer(O) {
return O;
}
// Not implemented correctly
// eslint-disable-next-line @typescript-eslint/no-unused-vars
function IsDetachedBuffer(O) {
return false;
}
function ArrayBufferSlice(buffer, begin, end) {
// ArrayBuffer.prototype.slice is not available on IE10
// https://www.caniuse.com/mdn-javascript_builtins_arraybuffer_slice
if (buffer.slice) {
return buffer.slice(begin, end);
}
const length = end - begin;
const slice = new ArrayBuffer(length);
CopyDataBlockBytes(slice, 0, buffer, begin, length);
return slice;
}
function IsNonNegativeNumber(v) {
if (typeof v !== 'number') {
return false;
}
if (NumberIsNaN(v)) {
return false;
}
if (v < 0) {
return false;
}
return true;
}
function CloneAsUint8Array(O) {
const buffer = ArrayBufferSlice(O.buffer, O.byteOffset, O.byteOffset + O.byteLength);
return new Uint8Array(buffer);
}
function DequeueValue(container) {
const pair = container._queue.shift();
container._queueTotalSize -= pair.size;
if (container._queueTotalSize < 0) {
container._queueTotalSize = 0;
}
return pair.value;
}
function EnqueueValueWithSize(container, value, size) {
if (!IsNonNegativeNumber(size) || size === Infinity) {
throw new RangeError('Size must be a finite, non-NaN, non-negative number.');
}
container._queue.push({ value, size });
container._queueTotalSize += size;
}
function PeekQueueValue(container) {
const pair = container._queue.peek();
return pair.value;
}
function ResetQueue(container) {
container._queue = new SimpleQueue();
container._queueTotalSize = 0;
}
/**
* A pull-into request in a {@link ReadableByteStreamController}.
*
* @public
*/
class ReadableStreamBYOBRequest {
constructor() {
throw new TypeError('Illegal constructor');
}
/**
* Returns the view for writing in to, or `null` if the BYOB request has already been responded to.
*/
get view() {
if (!IsReadableStreamBYOBRequest(this)) {
throw byobRequestBrandCheckException('view');
}
return this._view;
}
respond(bytesWritten) {
if (!IsReadableStreamBYOBRequest(this)) {
throw byobRequestBrandCheckException('respond');
}
assertRequiredArgument(bytesWritten, 1, 'respond');
bytesWritten = convertUnsignedLongLongWithEnforceRange(bytesWritten, 'First parameter');
if (this._associatedReadableByteStreamController === undefined) {
throw new TypeError('This BYOB request has been invalidated');
}
if (IsDetachedBuffer(this._view.buffer)) ;
ReadableByteStreamControllerRespond(this._associatedReadableByteStreamController, bytesWritten);
}
respondWithNewView(view) {
if (!IsReadableStreamBYOBRequest(this)) {
throw byobRequestBrandCheckException('respondWithNewView');
}
assertRequiredArgument(view, 1, 'respondWithNewView');
if (!ArrayBuffer.isView(view)) {
throw new TypeError('You can only respond with array buffer views');
}
if (this._associatedReadableByteStreamController === undefined) {
throw new TypeError('This BYOB request has been invalidated');
}
if (IsDetachedBuffer(view.buffer)) ;
ReadableByteStreamControllerRespondWithNewView(this._associatedReadableByteStreamController, view);
}
}
Object.defineProperties(ReadableStreamBYOBRequest.prototype, {
respond: { enumerable: true },
respondWithNewView: { enumerable: true },
view: { enumerable: true }
});
if (typeof SymbolPolyfill.toStringTag === 'symbol') {
Object.defineProperty(ReadableStreamBYOBRequest.prototype, SymbolPolyfill.toStringTag, {
value: 'ReadableStreamBYOBRequest',
configurable: true
});
}
/**
* Allows control of a {@link ReadableStream | readable byte stream}'s state and internal queue.
*
* @public
*/
class ReadableByteStreamController {
constructor() {
throw new TypeError('Illegal constructor');
}
/**
* Returns the current BYOB pull request, or `null` if there isn't one.
*/
get byobRequest() {
if (!IsReadableByteStreamController(this)) {
throw byteStreamControllerBrandCheckException('byobRequest');
}
return ReadableByteStreamControllerGetBYOBRequest(this);
}
/**
* Returns the desired size to fill the controlled stream's internal queue. It can be negative, if the queue is
* over-full. An underlying byte source ought to use this information to determine when and how to apply backpressure.
*/
get desiredSize() {
if (!IsReadableByteStreamController(this)) {
throw byteStreamControllerBrandCheckException('desiredSize');
}
return ReadableByteStreamControllerGetDesiredSize(this);
}
/**
* Closes the controlled readable stream. Consumers will still be able to read any previously-enqueued chunks from
* the stream, but once those are read, the stream will become closed.
*/
close() {
if (!IsReadableByteStreamController(this)) {
throw byteStreamControllerBrandCheckException('close');
}
if (this._closeRequested) {
throw new TypeError('The stream has already been closed; do not close it again!');
}
const state = this._controlledReadableByteStream._state;
if (state !== 'readable') {
throw new TypeError(`The stream (in ${state} state) is not in the readable state and cannot be closed`);
}
ReadableByteStreamControllerClose(this);
}
enqueue(chunk) {
if (!IsReadableByteStreamController(this)) {
throw byteStreamControllerBrandCheckException('enqueue');
}
assertRequiredArgument(chunk, 1, 'enqueue');
if (!ArrayBuffer.isView(chunk)) {
throw new TypeError('chunk must be an array buffer view');
}
if (chunk.byteLength === 0) {
throw new TypeError('chunk must have non-zero byteLength');
}
if (chunk.buffer.byteLength === 0) {
throw new TypeError(`chunk's buffer must have non-zero byteLength`);
}
if (this._closeRequested) {
throw new TypeError('stream is closed or draining');
}
const state = this._controlledReadableByteStream._state;
if (state !== 'readable') {
throw new TypeError(`The stream (in ${state} state) is not in the readable state and cannot be enqueued to`);
}
ReadableByteStreamControllerEnqueue(this, chunk);
}
/**
* Errors the controlled readable stream, making all future interactions with it fail with the given error `e`.
*/
error(e = undefined) {
if (!IsReadableByteStreamController(this)) {
throw byteStreamControllerBrandCheckException('error');
}
ReadableByteStreamControllerError(this, e);
}
/** @internal */
[CancelSteps](reason) {
ReadableByteStreamControllerClearPendingPullIntos(this);
ResetQueue(this);
const result = this._cancelAlgorithm(reason);
ReadableByteStreamControllerClearAlgorithms(this);
return result;
}
/** @internal */
[PullSteps](readRequest) {
const stream = this._controlledReadableByteStream;
if (this._queueTotalSize > 0) {
const entry = this._queue.shift();
this._queueTotalSize -= entry.byteLength;
ReadableByteStreamControllerHandleQueueDrain(this);
const view = new Uint8Array(entry.buffer, entry.byteOffset, entry.byteLength);
readRequest._chunkSteps(view);
return;
}
const autoAllocateChunkSize = this._autoAllocateChunkSize;
if (autoAllocateChunkSize !== undefined) {
let buffer;
try {
buffer = new ArrayBuffer(autoAllocateChunkSize);
}
catch (bufferE) {
readRequest._errorSteps(bufferE);
return;
}
const pullIntoDescriptor = {
buffer,
bufferByteLength: autoAllocateChunkSize,
byteOffset: 0,
byteLength: autoAllocateChunkSize,
bytesFilled: 0,
elementSize: 1,
viewConstructor: Uint8Array,
readerType: 'default'
};
this._pendingPullIntos.push(pullIntoDescriptor);
}
ReadableStreamAddReadRequest(stream, readRequest);
ReadableByteStreamControllerCallPullIfNeeded(this);
}
}
Object.defineProperties(ReadableByteStreamController.prototype, {
close: { enumerable: true },
enqueue: { enumerable: true },
error: { enumerable: true },
byobRequest: { enumerable: true },
desiredSize: { enumerable: true }
});
if (typeof SymbolPolyfill.toStringTag === 'symbol') {
Object.defineProperty(ReadableByteStreamController.prototype, SymbolPolyfill.toStringTag, {
value: 'ReadableByteStreamController',
configurable: true
});
}
// Abstract operations for the ReadableByteStreamController.
function IsReadableByteStreamController(x) {
if (!typeIsObject(x)) {
return false;
}
if (!Object.prototype.hasOwnProperty.call(x, '_controlledReadableByteStream')) {
return false;
}
return x instanceof ReadableByteStreamController;
}
function IsReadableStreamBYOBRequest(x) {
if (!typeIsObject(x)) {
return false;
}
if (!Object.prototype.hasOwnProperty.call(x, '_associatedReadableByteStreamController')) {
return false;
}
return x instanceof ReadableStreamBYOBRequest;
}
function ReadableByteStreamControllerCallPullIfNeeded(controller) {
const shouldPull = ReadableByteStreamControllerShouldCallPull(controller);
if (!shouldPull) {
return;
}
if (controller._pulling) {
controller._pullAgain = true;
return;
}
controller._pulling = true;
// TODO: Test controller argument
const pullPromise = controller._pullAlgorithm();
uponPromise(pullPromise, () => {
controller._pulling = false;
if (controller._pullAgain) {
controller._pullAgain = false;
ReadableByteStreamControllerCallPullIfNeeded(controller);
}
}, e => {
ReadableByteStreamControllerError(controller, e);
});
}
function ReadableByteStreamControllerClearPendingPullIntos(controller) {
ReadableByteStreamControllerInvalidateBYOBRequest(controller);
controller._pendingPullIntos = new SimpleQueue();
}
function ReadableByteStreamControllerCommitPullIntoDescriptor(stream, pullIntoDescriptor) {
let done = false;
if (stream._state === 'closed') {
done = true;
}
const filledView = ReadableByteStreamControllerConvertPullIntoDescriptor(pullIntoDescriptor);
if (pullIntoDescriptor.readerType === 'default') {
ReadableStreamFulfillReadRequest(stream, filledView, done);
}
else {
ReadableStreamFulfillReadIntoRequest(stream, filledView, done);
}
}
function ReadableByteStreamControllerConvertPullIntoDescriptor(pullIntoDescriptor) {
const bytesFilled = pullIntoDescriptor.bytesFilled;
const elementSize = pullIntoDescriptor.elementSize;
return new pullIntoDescriptor.viewConstructor(pullIntoDescriptor.buffer, pullIntoDescriptor.byteOffset, bytesFilled / elementSize);
}
function ReadableByteStreamControllerEnqueueChunkToQueue(controller, buffer, byteOffset, byteLength) {
controller._queue.push({ buffer, byteOffset, byteLength });
controller._queueTotalSize += byteLength;
}
function ReadableByteStreamControllerFillPullIntoDescriptorFromQueue(controller, pullIntoDescriptor) {
const elementSize = pullIntoDescriptor.elementSize;
const currentAlignedBytes = pullIntoDescriptor.bytesFilled - pullIntoDescriptor.bytesFilled % elementSize;
const maxBytesToCopy = Math.min(controller._queueTotalSize, pullIntoDescriptor.byteLength - pullIntoDescriptor.bytesFilled);
const maxBytesFilled = pullIntoDescriptor.bytesFilled + maxBytesToCopy;
const maxAlignedBytes = maxBytesFilled - maxBytesFilled % elementSize;
let totalBytesToCopyRemaining = maxBytesToCopy;
let ready = false;
if (maxAlignedBytes > currentAlignedBytes) {
totalBytesToCopyRemaining = maxAlignedBytes - pullIntoDescriptor.bytesFilled;
ready = true;
}
const queue = controller._queue;
while (totalBytesToCopyRemaining > 0) {
const headOfQueue = queue.peek();
const bytesToCopy = Math.min(totalBytesToCopyRemaining, headOfQueue.byteLength);
const destStart = pullIntoDescriptor.byteOffset + pullIntoDescriptor.bytesFilled;
CopyDataBlockBytes(pullIntoDescriptor.buffer, destStart, headOfQueue.buffer, headOfQueue.byteOffset, bytesToCopy);
if (headOfQueue.byteLength === bytesToCopy) {
queue.shift();
}
else {
headOfQueue.byteOffset += bytesToCopy;
headOfQueue.byteLength -= bytesToCopy;
}
controller._queueTotalSize -= bytesToCopy;
ReadableByteStreamControllerFillHeadPullIntoDescriptor(controller, bytesToCopy, pullIntoDescriptor);
totalBytesToCopyRemaining -= bytesToCopy;
}
return ready;
}
function ReadableByteStreamControllerFillHeadPullIntoDescriptor(controller, size, pullIntoDescriptor) {
pullIntoDescriptor.bytesFilled += size;
}
function ReadableByteStreamControllerHandleQueueDrain(controller) {
if (controller._queueTotalSize === 0 && controller._closeRequested) {
ReadableByteStreamControllerClearAlgorithms(controller);
ReadableStreamClose(controller._controlledReadableByteStream);
}
else {
ReadableByteStreamControllerCallPullIfNeeded(controller);
}
}
function ReadableByteStreamControllerInvalidateBYOBRequest(controller) {
if (controller._byobRequest === null) {
return;
}
controller._byobRequest._associatedReadableByteStreamController = undefined;
controller._byobRequest._view = null;
controller._byobRequest = null;
}
function ReadableByteStreamControllerProcessPullIntoDescriptorsUsingQueue(controller) {
while (controller._pendingPullIntos.length > 0) {
if (controller._queueTotalSize === 0) {
return;
}
const pullIntoDescriptor = controller._pendingPullIntos.peek();
if (ReadableByteStreamControllerFillPullIntoDescriptorFromQueue(controller, pullIntoDescriptor)) {
ReadableByteStreamControllerShiftPendingPullInto(controller);
ReadableByteStreamControllerCommitPullIntoDescriptor(controller._controlledReadableByteStream, pullIntoDescriptor);
}
}
}
function ReadableByteStreamControllerPullInto(controller, view, readIntoRequest) {
const stream = controller._controlledReadableByteStream;
let elementSize = 1;
if (view.constructor !== DataView) {
elementSize = view.constructor.BYTES_PER_ELEMENT;
}
const ctor = view.constructor;
// try {
const buffer = TransferArrayBuffer(view.buffer);
// } catch (e) {
// readIntoRequest._errorSteps(e);
// return;
// }
const pullIntoDescriptor = {
buffer,
bufferByteLength: buffer.byteLength,
byteOffset: view.byteOffset,
byteLength: view.byteLength,
bytesFilled: 0,
elementSize,
viewConstructor: ctor,
readerType: 'byob'
};
if (controller._pendingPullIntos.length > 0) {
controller._pendingPullIntos.push(pullIntoDescriptor);
// No ReadableByteStreamControllerCallPullIfNeeded() call since:
// - No change happens on desiredSize
// - The source has already been notified of that there's at least 1 pending read(view)
ReadableStreamAddReadIntoRequest(stream, readIntoRequest);
return;
}
if (stream._state === 'closed') {
const emptyView = new ctor(pullIntoDescriptor.buffer, pullIntoDescriptor.byteOffset, 0);
readIntoRequest._closeSteps(emptyView);
return;
}
if (controller._queueTotalSize > 0) {
if (ReadableByteStreamControllerFillPullIntoDescriptorFromQueue(controller, pullIntoDescriptor)) {
const filledView = ReadableByteStreamControllerConvertPullIntoDescriptor(pullIntoDescriptor);
ReadableByteStreamControllerHandleQueueDrain(controller);
readIntoRequest._chunkSteps(filledView);
return;
}
if (controller._closeRequested) {
const e = new TypeError('Insufficient bytes to fill elements in the given buffer');
ReadableByteStreamControllerError(controller, e);
readIntoRequest._errorSteps(e);
return;
}
}
controller._pendingPullIntos.push(pullIntoDescriptor);
ReadableStreamAddReadIntoRequest(stream, readIntoRequest);
ReadableByteStreamControllerCallPullIfNeeded(controller);
}
function ReadableByteStreamControllerRespondInClosedState(controller, firstDescriptor) {
const stream = controller._controlledReadableByteStream;
if (ReadableStreamHasBYOBReader(stream)) {
while (ReadableStreamGetNumReadIntoRequests(stream) > 0) {
const pullIntoDescriptor = ReadableByteStreamControllerShiftPendingPullInto(controller);
ReadableByteStreamControllerCommitPullIntoDescriptor(stream, pullIntoDescriptor);
}
}
}
function ReadableByteStreamControllerRespondInReadableState(controller, bytesWritten, pullIntoDescriptor) {
ReadableByteStreamControllerFillHeadPullIntoDescriptor(controller, bytesWritten, pullIntoDescriptor);
if (pullIntoDescriptor.bytesFilled < pullIntoDescriptor.elementSize) {
return;
}
ReadableByteStreamControllerShiftPendingPullInto(controller);
const remainderSize = pullIntoDescriptor.bytesFilled % pullIntoDescriptor.elementSize;
if (remainderSize > 0) {
const end = pullIntoDescriptor.byteOffset + pullIntoDescriptor.bytesFilled;
const remainder = ArrayBufferSlice(pullIntoDescriptor.buffer, end - remainderSize, end);
ReadableByteStreamControllerEnqueueChunkToQueue(controller, remainder, 0, remainder.byteLength);
}
pullIntoDescriptor.bytesFilled -= remainderSize;
ReadableByteStreamControllerCommitPullIntoDescriptor(controller._controlledReadableByteStream, pullIntoDescriptor);
ReadableByteStreamControllerProcessPullIntoDescriptorsUsingQueue(controller);
}
function ReadableByteStreamControllerRespondInternal(controller, bytesWritten) {
const firstDescriptor = controller._pendingPullIntos.peek();
ReadableByteStreamControllerInvalidateBYOBRequest(controller);
const state = controller._controlledReadableByteStream._state;
if (state === 'closed') {
ReadableByteStreamControllerRespondInClosedState(controller);
}
else {
ReadableByteStreamControllerRespondInReadableState(controller, bytesWritten, firstDescriptor);
}
ReadableByteStreamControllerCallPullIfNeeded(controller);
}
function ReadableByteStreamControllerShiftPendingPullInto(controller) {
const descriptor = controller._pendingPullIntos.shift();
return descriptor;
}
function ReadableByteStreamControllerShouldCallPull(controller) {
const stream = controller._controlledReadableByteStream;
if (stream._state !== 'readable') {
return false;
}
if (controller._closeRequested) {
return false;
}
if (!controller._started) {
return false;
}
if (ReadableStreamHasDefaultReader(stream) && ReadableStreamGetNumReadRequests(stream) > 0) {
return true;
}
if (ReadableStreamHasBYOBReader(stream) && ReadableStreamGetNumReadIntoRequests(stream) > 0) {
return true;
}
const desiredSize = ReadableByteStreamControllerGetDesiredSize(controller);
if (desiredSize > 0) {
return true;
}
return false;
}
function ReadableByteStreamControllerClearAlgorithms(controller) {
controller._pullAlgorithm = undefined;
controller._cancelAlgorithm = undefined;
}
// A client of ReadableByteStreamController may use these functions directly to bypass state check.
function ReadableByteStreamControllerClose(controller) {
const stream = controller._controlledReadableByteStream;
if (controller._closeRequested || stream._state !== 'readable') {
return;
}
if (controller._queueTotalSize > 0) {
controller._closeRequested = true;
return;
}
if (controller._pendingPullIntos.length > 0) {
const firstPendingPullInto = controller._pendingPullIntos.peek();
if (firstPendingPullInto.bytesFilled > 0) {
const e = new TypeError('Insufficient bytes to fill elements in the given buffer');
ReadableByteStreamControllerError(controller, e);
throw e;
}
}
ReadableByteStreamControllerClearAlgorithms(controller);
ReadableStreamClose(stream);
}
function ReadableByteStreamControllerEnqueue(controller, chunk) {
const stream = controller._controlledReadableByteStream;
if (controller._closeRequested || stream._state !== 'readable') {
return;
}
const buffer = chunk.buffer;
const byteOffset = chunk.byteOffset;
const byteLength = chunk.byteLength;
const transferredBuffer = TransferArrayBuffer(buffer);
if (controller._pendingPullIntos.length > 0) {
const firstPendingPullInto = controller._pendingPullIntos.peek();
if (IsDetachedBuffer(firstPendingPullInto.buffer)) ;
firstPendingPullInto.buffer = TransferArrayBuffer(firstPendingPullInto.buffer);
}
ReadableByteStreamControllerInvalidateBYOBRequest(controller);
if (ReadableStreamHasDefaultReader(stream)) {
if (ReadableStreamGetNumReadRequests(stream) === 0) {
ReadableByteStreamControllerEnqueueChunkToQueue(controller, transferredBuffer, byteOffset, byteLength);
}
else {
if (controller._pendingPullIntos.length > 0) {
ReadableByteStreamControllerShiftPendingPullInto(controller);
}
const transferredView = new Uint8Array(transferredBuffer, byteOffset, byteLength);
ReadableStreamFulfillReadRequest(stream, transferredView, false);
}
}
else if (ReadableStreamHasBYOBReader(stream)) {
// TODO: Ideally in this branch detaching should happen only if the buffer is not consumed fully.
ReadableByteStreamControllerEnqueueChunkToQueue(controller, transferredBuffer, byteOffset, byteLength);
ReadableByteStreamControllerProcessPullIntoDescriptorsUsingQueue(controller);
}
else {
ReadableByteStreamControllerEnqueueChunkToQueue(controller, transferredBuffer, byteOffset, byteLength);
}
ReadableByteStreamControllerCallPullIfNeeded(controller);
}
function ReadableByteStreamControllerError(controller, e) {
const stream = controller._controlledReadableByteStream;
if (stream._state !== 'readable') {
return;
}
ReadableByteStreamControllerClearPendingPullIntos(controller);
ResetQueue(controller);
ReadableByteStreamControllerClearAlgorithms(controller);
ReadableStreamError(stream, e);
}
function ReadableByteStreamControllerGetBYOBRequest(controller) {
if (controller._byobRequest === null && controller._pendingPullIntos.length > 0) {
const firstDescriptor = controller._pendingPullIntos.peek();
const view = new Uint8Array(firstDescriptor.buffer, firstDescriptor.byteOffset + firstDescriptor.bytesFilled, firstDescriptor.byteLength - firstDescriptor.bytesFilled);
const byobRequest = Object.create(ReadableStreamBYOBRequest.prototype);
SetUpReadableStreamBYOBRequest(byobRequest, controller, view);
controller._byobRequest = byobRequest;
}
return controller._byobRequest;
}
function ReadableByteStreamControllerGetDesiredSize(controller) {
const state = controller._controlledReadableByteStream._state;
if (state === 'errored') {
return null;
}
if (state === 'closed') {
return 0;
}
return controller._strategyHWM - controller._queueTotalSize;
}
function ReadableByteStreamControllerRespond(controller, bytesWritten) {
const firstDescriptor = controller._pendingPullIntos.peek();
const state = controller._controlledReadableByteStream._state;
if (state === 'closed') {
if (bytesWritten !== 0) {
throw new TypeError('bytesWritten must be 0 when calling respond() on a closed stream');
}
}
else {
if (bytesWritten === 0) {
throw new TypeError('bytesWritten must be greater than 0 when calling respond() on a readable stream');
}
if (firstDescriptor.bytesFilled + bytesWritten > firstDescriptor.byteLength) {
throw new RangeError('bytesWritten out of range');
}
}
firstDescriptor.buffer = TransferArrayBuffer(firstDescriptor.buffer);
ReadableByteStreamControllerRespondInternal(controller, bytesWritten);
}
function ReadableByteStreamControllerRespondWithNewView(controller, view) {
const firstDescriptor = controller._pendingPullIntos.peek();
const state = controller._controlledReadableByteStream._state;
if (state === 'closed') {
if (view.byteLength !== 0) {
throw new TypeError('The view\'s length must be 0 when calling respondWithNewView() on a closed stream');
}
}
else {
if (view.byteLength === 0) {
throw new TypeError('The view\'s length must be greater than 0 when calling respondWithNewView() on a readable stream');
}
}
if (firstDescriptor.byteOffset + firstDescriptor.bytesFilled !== view.byteOffset) {
throw new RangeError('The region specified by view does not match byobRequest');
}
if (firstDescriptor.bufferByteLength !== view.buffer.byteLength) {
throw new RangeError('The buffer of view has different capacity than byobRequest');
}
if (firstDescriptor.bytesFilled + view.byteLength > firstDescriptor.byteLength) {
throw new RangeError('The region specified by view is larger than byobRequest');
}
const viewByteLength = view.byteLength;
firstDescriptor.buffer = TransferArrayBuffer(view.buffer);
ReadableByteStreamControllerRespondInternal(controller, viewByteLength);
}
function SetUpReadableByteStreamController(stream, controller, startAlgorithm, pullAlgorithm, cancelAlgorithm, highWaterMark, autoAllocateChunkSize) {
controller._controlledReadableByteStream = stream;
controller._pullAgain = false;
controller._pulling = false;
controller._byobRequest = null;
// Need to set the slots so that the assert doesn't fire. In the spec the slots already exist implicitly.
controller._queue = controller._queueTotalSize = undefined;
ResetQueue(controller);
controller._closeRequested = false;
controller._started = false;
controller._strategyHWM = highWaterMark;
controller._pullAlgorithm = pullAlgorithm;
controller._cancelAlgorithm = cancelAlgorithm;
controller._autoAllocateChunkSize = autoAllocateChunkSize;
controller._pendingPullIntos = new SimpleQueue();
stream._readableStreamController = controller;
const startResult = startAlgorithm();
uponPromise(promiseResolvedWith(startResult), () => {
controller._started = true;
ReadableByteStreamControllerCallPullIfNeeded(controller);
}, r => {
ReadableByteStreamControllerError(controller, r);
});
}
function SetUpReadableByteStreamControllerFromUnderlyingSource(stream, underlyingByteSource, highWaterMark) {
const controller = Object.create(ReadableByteStreamController.prototype);
let startAlgorithm = () => undefined;
let pullAlgorithm = () => promiseResolvedWith(undefined);
let cancelAlgorithm = () => promiseResolvedWith(undefined);
if (underlyingByteSource.start !== undefined) {
startAlgorithm = () => underlyingByteSource.start(controller);
}
if (underlyingByteSource.pull !== undefined) {
pullAlgorithm = () => underlyingByteSource.pull(controller);
}
if (underlyingByteSource.cancel !== undefined) {
cancelAlgorithm = reason => underlyingByteSource.cancel(reason);
}
const autoAllocateChunkSize = underlyingByteSource.autoAllocateChunkSize;
if (autoAllocateChunkSize === 0) {
throw new TypeError('autoAllocateChunkSize must be greater than 0');
}
SetUpReadableByteStreamController(stream, controller, startAlgorithm, pullAlgorithm, cancelAlgorithm, highWaterMark, autoAllocateChunkSize);
}
function SetUpReadableStreamBYOBRequest(request, controller, view) {
request._associatedReadableByteStreamController = controller;
request._view = view;
}
// Helper functions for the ReadableStreamBYOBRequest.
function byobRequestBrandCheckException(name) {
return new TypeError(`ReadableStreamBYOBRequest.prototype.${name} can only be used on a ReadableStreamBYOBRequest`);
}
// Helper functions for the ReadableByteStreamController.
function byteStreamControllerBrandCheckException(name) {
return new TypeError(`ReadableByteStreamController.prototype.${name} can only be used on a ReadableByteStreamController`);
}
// Abstract operations for the ReadableStream.
function AcquireReadableStreamBYOBReader(stream) {
return new ReadableStreamBYOBReader(stream);
}
// ReadableStream API exposed for controllers.
function ReadableStreamAddReadIntoRequest(stream, readIntoRequest) {
stream._reader._readIntoRequests.push(readIntoRequest);
}
function ReadableStreamFulfillReadIntoRequest(stream, chunk, done) {
const reader = stream._reader;
const readIntoRequest = reader._readIntoRequests.shift();
if (done) {
readIntoRequest._closeSteps(chunk);
}
else {
readIntoRequest._chunkSteps(chunk);
}
}
function ReadableStreamGetNumReadIntoRequests(stream) {
return stream._reader._readIntoRequests.length;
}
function ReadableStreamHasBYOBReader(stream) {
const reader = stream._reader;
if (reader === undefined) {
return false;
}
if (!IsReadableStreamBYOBReader(reader)) {
return false;
}
return true;
}
/**
* A BYOB reader vended by a {@link ReadableStream}.
*
* @public
*/
class ReadableStreamBYOBReader {
constructor(stream) {
assertRequiredArgument(stream, 1, 'ReadableStreamBYOBReader');
assertReadableStream(stream, 'First parameter');
if (IsReadableStreamLocked(stream)) {
throw new TypeError('This stream has already been locked for exclusive reading by another reader');
}
if (!IsReadableByteStreamController(stream._readableStreamController)) {
throw new TypeError('Cannot construct a ReadableStreamBYOBReader for a stream not constructed with a byte ' +
'source');
}
ReadableStreamReaderGenericInitialize(this, stream);
this._readIntoRequests = new SimpleQueue();
}
/**
* Returns a promise that will be fulfilled when the stream becomes closed, or rejected if the stream ever errors or
* the reader's lock is released before the stream finishes closing.
*/
get closed() {
if (!IsReadableStreamBYOBReader(this)) {
return promiseRejectedWith(byobReaderBrandCheckException('closed'));
}
return this._closedPromise;
}
/**
* If the reader is active, behaves the same as {@link ReadableStream.cancel | stream.cancel(reason)}.
*/
cancel(reason = undefined) {
if (!IsReadableStreamBYOBReader(this)) {
return promiseRejectedWith(byobReaderBrandCheckException('cancel'));
}
if (this._ownerReadableStream === undefined) {
return promiseRejectedWith(readerLockException('cancel'));
}
return ReadableStreamReaderGenericCancel(this, reason);
}
/**
* Attempts to reads bytes into view, and returns a promise resolved with the result.
*
* If reading a chunk causes the queue to become empty, more data will be pulled from the underlying source.
*/
read(view) {
if (!IsReadableStreamBYOBReader(this)) {
return promiseRejectedWith(byobReaderBrandCheckException('read'));
}
if (!ArrayBuffer.isView(view)) {
return promiseRejectedWith(new TypeError('view must be an array buffer view'));
}
if (view.byteLength === 0) {
return promiseRejectedWith(new TypeError('view must have non-zero byteLength'));
}
if (view.buffer.byteLength === 0) {
return promiseRejectedWith(new TypeError(`view's buffer must have non-zero byteLength`));
}
if (IsDetachedBuffer(view.buffer)) ;
if (this._ownerReadableStream === undefined) {
return promiseRejectedWith(readerLockException('read from'));
}
let resolvePromise;
let rejectPromise;
const promise = newPromise((resolve, reject) => {
resolvePromise = resolve;
rejectPromise = reject;
});
const readIntoRequest = {
_chunkSteps: chunk => resolvePromise({ value: chunk, done: false }),
_closeSteps: chunk => resolvePromise({ value: chunk, done: true }),
_errorSteps: e => rejectPromise(e)
};
ReadableStreamBYOBReaderRead(this, view, readIntoRequest);
return promise;
}
/**
* Releases the reader's lock on the corresponding stream. After the lock is released, the reader is no longer active.
* If the associated stream is errored when the lock is released, the reader will appear errored in the same way
* from now on; otherwise, the reader will appear closed.
*
* A reader's lock cannot be released while it still has a pending read request, i.e., if a promise returned by
* the reader's {@link ReadableStreamBYOBReader.read | read()} method has not yet been settled. Attempting to
* do so will throw a `TypeError` and leave the reader locked to the stream.
*/
releaseLock() {
if (!IsReadableStreamBYOBReader(this)) {
throw byobReaderBrandCheckException('releaseLock');
}
if (this._ownerReadableStream === undefined) {
return;
}
if (this._readIntoRequests.length > 0) {
throw new TypeError('Tried to release a reader lock when that reader has pending read() calls un-settled');
}
ReadableStreamReaderGenericRelease(this);
}
}
Object.defineProperties(ReadableStreamBYOBReader.prototype, {
cancel: { enumerable: true },
read: { enumerable: true },
releaseLock: { enumerable: true },
closed: { enumerable: true }
});
if (typeof SymbolPolyfill.toStringTag === 'symbol') {
Object.defineProperty(ReadableStreamBYOBReader.prototype, SymbolPolyfill.toStringTag, {
value: 'ReadableStreamBYOBReader',
configurable: true
});
}
// Abstract operations for the readers.
function IsReadableStreamBYOBReader(x) {
if (!typeIsObject(x)) {
return false;
}
if (!Object.prototype.hasOwnProperty.call(x, '_readIntoRequests')) {
return false;
}
return x instanceof ReadableStreamBYOBReader;
}
function ReadableStreamBYOBReaderRead(reader, view, readIntoRequest) {
const stream = reader._ownerReadableStream;
stream._disturbed = true;
if (stream._state === 'errored') {
readIntoRequest._errorSteps(stream._storedError);
}
else {
ReadableByteStreamControllerPullInto(stream._readableStreamController, view, readIntoRequest);
}
}
// Helper functions for the ReadableStreamBYOBReader.
function byobReaderBrandCheckException(name) {
return new TypeError(`ReadableStreamBYOBReader.prototype.${name} can only be used on a ReadableStreamBYOBReader`);
}
function ExtractHighWaterMark(strategy, defaultHWM) {
const { highWaterMark } = strategy;
if (highWaterMark === undefined) {
return defaultHWM;
}
if (NumberIsNaN(highWaterMark) || highWaterMark < 0) {
throw new RangeError('Invalid highWaterMark');
}
return highWaterMark;
}
function ExtractSizeAlgorithm(strategy) {
const { size } = strategy;
if (!size) {
return () => 1;
}
return size;
}
function convertQueuingStrategy(init, context) {
assertDictionary(init, context);
const highWaterMark = init === null || init === void 0 ? void 0 : init.highWaterMark;
const size = init === null || init === void 0 ? void 0 : init.size;
return {
highWaterMark: highWaterMark === undefined ? undefined : convertUnrestrictedDouble(highWaterMark),
size: size === undefined ? undefined : convertQueuingStrategySize(size, `${context} has member 'size' that`)
};
}
function convertQueuingStrategySize(fn, context) {
assertFunction(fn, context);
return chunk => convertUnrestrictedDouble(fn(chunk));
}
function convertUnderlyingSink(original, context) {
assertDictionary(original, context);
const abort = original === null || original === void 0 ? void 0 : original.abort;
const close = original === null || original === void 0 ? void 0 : original.close;
const start = original === null || original === void 0 ? void 0 : original.start;
const type = original === null || original === void 0 ? void 0 : original.type;
const write = original === null || original === void 0 ? void 0 : original.write;
return {
abort: abort === undefined ?
undefined :
convertUnderlyingSinkAbortCallback(abort, original, `${context} has member 'abort' that`),
close: close === undefined ?
undefined :
convertUnderlyingSinkCloseCallback(close, original, `${context} has member 'close' that`),
start: start === undefined ?
undefined :
convertUnderlyingSinkStartCallback(start, original, `${context} has member 'start' that`),
write: write === undefined ?
undefined :
convertUnderlyingSinkWriteCallback(write, original, `${context} has member 'write' that`),
type
};
}
function convertUnderlyingSinkAbortCallback(fn, original, context) {
assertFunction(fn, context);
return (reason) => promiseCall(fn, original, [reason]);
}
function convertUnderlyingSinkCloseCallback(fn, original, context) {
assertFunction(fn, context);
return () => promiseCall(fn, original, []);
}
function convertUnderlyingSinkStartCallback(fn, original, context) {
assertFunction(fn, context);
return (controller) => reflectCall(fn, original, [controller]);
}
function convertUnderlyingSinkWriteCallback(fn, original, context) {
assertFunction(fn, context);
return (chunk, controller) => promiseCall(fn, original, [chunk, controller]);
}
function assertWritableStream(x, context) {
if (!IsWritableStream(x)) {
throw new TypeError(`${context} is not a WritableStream.`);
}
}
function isAbortSignal(value) {
if (typeof value !== 'object' || value === null) {
return false;
}
try {
return typeof value.aborted === 'boolean';
}
catch (_a) {
// AbortSignal.prototype.aborted throws if its brand check fails
return false;
}
}
const supportsAbortController = typeof AbortController === 'function';
/**
* Construct a new AbortController, if supported by the platform.
*
* @internal
*/
function createAbortController() {
if (supportsAbortController) {
return new AbortController();
}
return undefined;
}
/**
* A writable stream represents a destination for data, into which you can write.
*
* @public
*/
class WritableStream {
constructor(rawUnderlyingSink = {}, rawStrategy = {}) {
if (rawUnderlyingSink === undefined) {
rawUnderlyingSink = null;
}
else {
assertObject(rawUnderlyingSink, 'First parameter');
}
const strategy = convertQueuingStrategy(rawStrategy, 'Second parameter');
const underlyingSink = convertUnderlyingSink(rawUnderlyingSink, 'First parameter');
InitializeWritableStream(this);
const type = underlyingSink.type;
if (type !== undefined) {
throw new RangeError('Invalid type is specified');
}
const sizeAlgorithm = ExtractSizeAlgorithm(strategy);
const highWaterMark = ExtractHighWaterMark(strategy, 1);
SetUpWritableStreamDefaultControllerFromUnderlyingSink(this, underlyingSink, highWaterMark, sizeAlgorithm);
}
/**
* Returns whether or not the writable stream is locked to a writer.
*/
get locked() {
if (!IsWritableStream(this)) {
throw streamBrandCheckException$2('locked');
}
return IsWritableStreamLocked(this);
}
/**
* Aborts the stream, signaling that the producer can no longer successfully write to the stream and it is to be
* immediately moved to an errored state, with any queued-up writes discarded. This will also execute any abort
* mechanism of the underlying sink.
*
* The returned promise will fulfill if the stream shuts down successfully, or reject if the underlying sink signaled
* that there was an error doing so. Additionally, it will reject with a `TypeError` (without attempting to cancel
* the stream) if the stream is currently locked.
*/
abort(reason = undefined) {
if (!IsWritableStream(this)) {
return promiseRejectedWith(streamBrandCheckException$2('abort'));
}
if (IsWritableStreamLocked(this)) {
return promiseRejectedWith(new TypeError('Cannot abort a stream that already has a writer'));
}
return WritableStreamAbort(this, reason);
}
/**
* Closes the stream. The underlying sink will finish processing any previously-written chunks, before invoking its
* close behavior. During this time any further attempts to write will fail (without erroring the stream).
*
* The method returns a promise that will fulfill if all remaining chunks are successfully written and the stream
* successfully closes, or rejects if an error is encountered during this process. Additionally, it will reject with
* a `TypeError` (without attempting to cancel the stream) if the stream is currently locked.
*/
close() {
if (!IsWritableStream(this)) {
return promiseRejectedWith(streamBrandCheckException$2('close'));
}
if (IsWritableStreamLocked(this)) {
return promiseRejectedWith(new TypeError('Cannot close a stream that already has a writer'));
}
if (WritableStreamCloseQueuedOrInFlight(this)) {
return promiseRejectedWith(new TypeError('Cannot close an already-closing stream'));
}
return WritableStreamClose(this);
}
/**
* Creates a {@link WritableStreamDefaultWriter | writer} and locks the stream to the new writer. While the stream
* is locked, no other writer can be acquired until this one is released.
*
* This functionality is especially useful for creating abstractions that desire the ability to write to a stream
* without interruption or interleaving. By getting a writer for the stream, you can ensure nobody else can write at
* the same time, which would cause the resulting written data to be unpredictable and probably useless.
*/
getWriter() {
if (!IsWritableStream(this)) {
throw streamBrandCheckException$2('getWriter');
}
return AcquireWritableStreamDefaultWriter(this);
}
}
Object.defineProperties(WritableStream.prototype, {
abort: { enumerable: true },
close: { enumerable: true },
getWriter: { enumerable: true },
locked: { enumerable: true }
});
if (typeof SymbolPolyfill.toStringTag === 'symbol') {
Object.defineProperty(WritableStream.prototype, SymbolPolyfill.toStringTag, {
value: 'WritableStream',
configurable: true
});
}
// Abstract operations for the WritableStream.
function AcquireWritableStreamDefaultWriter(stream) {
return new WritableStreamDefaultWriter(stream);
}
// Throws if and only if startAlgorithm throws.
function CreateWritableStream(startAlgorithm, writeAlgorithm, closeAlgorithm, abortAlgorithm, highWaterMark = 1, sizeAlgorithm = () => 1) {
const stream = Object.create(WritableStream.prototype);
InitializeWritableStream(stream);
const controller = Object.create(WritableStreamDefaultController.prototype);
SetUpWritableStreamDefaultController(stream, controller, startAlgorithm, writeAlgorithm, closeAlgorithm, abortAlgorithm, highWaterMark, sizeAlgorithm);
return stream;
}
function InitializeWritableStream(stream) {
stream._state = 'writable';
// The error that will be reported by new method calls once the state becomes errored. Only set when [[state]] is
// 'erroring' or 'errored'. May be set to an undefined value.
stream._storedError = undefined;
stream._writer = undefined;
// Initialize to undefined first because the constructor of the controller checks this
// variable to validate the caller.
stream._writableStreamController = undefined;
// This queue is placed here instead of the writer class in order to allow for passing a writer to the next data
// producer without waiting for the queued writes to finish.
stream._writeRequests = new SimpleQueue();
// Write requests are removed from _writeRequests when write() is called on the underlying sink. This prevents
// them from being erroneously rejected on error. If a write() call is in-flight, the request is stored here.
stream._inFlightWriteRequest = undefined;
// The promise that was returned from writer.close(). Stored here because it may be fulfilled after the writer
// has been detached.
stream._closeRequest = undefined;
// Close request is removed from _closeRequest when close() is called on the underlying sink. This prevents it
// from being erroneously rejected on error. If a close() call is in-flight, the request is stored here.
stream._inFlightCloseRequest = undefined;
// The promise that was returned from writer.abort(). This may also be fulfilled after the writer has detached.
stream._pendingAbortRequest = undefined;
// The backpressure signal set by the controller.
stream._backpressure = false;
}
function IsWritableStream(x) {
if (!typeIsObject(x)) {
return false;
}
if (!Object.prototype.hasOwnProperty.call(x, '_writableStreamController')) {
return false;
}
return x instanceof WritableStream;
}
function IsWritableStreamLocked(stream) {
if (stream._writer === undefined) {
return false;
}
return true;
}
function WritableStreamAbort(stream, reason) {
var _a;
if (stream._state === 'closed' || stream._state === 'errored') {
return promiseResolvedWith(undefined);
}
stream._writableStreamController._abortReason = reason;
(_a = stream._writableStreamController._abortController) === null || _a === void 0 ? void 0 : _a.abort();
// TypeScript narrows the type of `stream._state` down to 'writable' | 'erroring',
// but it doesn't know that signaling abort runs author code that might have changed the state.
// Widen the type again by casting to WritableStreamState.
const state = stream._state;
if (state === 'closed' || state === 'errored') {
return promiseResolvedWith(undefined);
}
if (stream._pendingAbortRequest !== undefined) {
return stream._pendingAbortRequest._promise;
}
let wasAlreadyErroring = false;
if (state === 'erroring') {
wasAlreadyErroring = true;
// reason will not be used, so don't keep a reference to it.
reason = undefined;
}
const promise = newPromise((resolve, reject) => {
stream._pendingAbortRequest = {
_promise: undefined,
_resolve: resolve,
_reject: reject,
_reason: reason,
_wasAlreadyErroring: wasAlreadyErroring
};
});
stream._pendingAbortRequest._promise = promise;
if (!wasAlreadyErroring) {
WritableStreamStartErroring(stream, reason);
}
return promise;
}
function WritableStreamClose(stream) {
const state = stream._state;
if (state === 'closed' || state === 'errored') {
return promiseRejectedWith(new TypeError(`The stream (in ${state} state) is not in the writable state and cannot be closed`));
}
const promise = newPromise((resolve, reject) => {
const closeRequest = {
_resolve: resolve,
_reject: reject
};
stream._closeRequest = closeRequest;
});
const writer = stream._writer;
if (writer !== undefined && stream._backpressure && state === 'writable') {
defaultWriterReadyPromiseResolve(writer);
}
WritableStreamDefaultControllerClose(stream._writableStreamController);
return promise;
}
// WritableStream API exposed for controllers.
function WritableStreamAddWriteRequest(stream) {
const promise = newPromise((resolve, reject) => {
const writeRequest = {
_resolve: resolve,
_reject: reject
};
stream._writeRequests.push(writeRequest);
});
return promise;
}
function WritableStreamDealWithRejection(stream, error) {
const state = stream._state;
if (state === 'writable') {
WritableStreamStartErroring(stream, error);
return;
}
WritableStreamFinishErroring(stream);
}
function WritableStreamStartErroring(stream, reason) {
const controller = stream._writableStreamController;
stream._state = 'erroring';
stream._storedError = reason;
const writer = stream._writer;
if (writer !== undefined) {
WritableStreamDefaultWriterEnsureReadyPromiseRejected(writer, reason);
}
if (!WritableStreamHasOperationMarkedInFlight(stream) && controller._started) {
WritableStreamFinishErroring(stream);
}
}
function WritableStreamFinishErroring(stream) {
stream._state = 'errored';
stream._writableStreamController[ErrorSteps]();
const storedError = stream._storedError;
stream._writeRequests.forEach(writeRequest => {
writeRequest._reject(storedError);
});
stream._writeRequests = new SimpleQueue();
if (stream._pendingAbortRequest === undefined) {
WritableStreamRejectCloseAndClosedPromiseIfNeeded(stream);
return;
}
const abortRequest = stream._pendingAbortRequest;
stream._pendingAbortRequest = undefined;
if (abortRequest._wasAlreadyErroring) {
abortRequest._reject(storedError);
WritableStreamRejectCloseAndClosedPromiseIfNeeded(stream);
return;
}
const promise = stream._writableStreamController[AbortSteps](abortRequest._reason);
uponPromise(promise, () => {
abortRequest._resolve();
WritableStreamRejectCloseAndClosedPromiseIfNeeded(stream);
}, (reason) => {
abortRequest._reject(reason);
WritableStreamRejectCloseAndClosedPromiseIfNeeded(stream);
});
}
function WritableStreamFinishInFlightWrite(stream) {
stream._inFlightWriteRequest._resolve(undefined);
stream._inFlightWriteRequest = undefined;
}
function WritableStreamFinishInFlightWriteWithError(stream, error) {
stream._inFlightWriteRequest._reject(error);
stream._inFlightWriteRequest = undefined;
WritableStreamDealWithRejection(stream, error);
}
function WritableStreamFinishInFlightClose(stream) {
stream._inFlightCloseRequest._resolve(undefined);
stream._inFlightCloseRequest = undefined;
const state = stream._state;
if (state === 'erroring') {
// The error was too late to do anything, so it is ignored.
stream._storedError = undefined;
if (stream._pendingAbortRequest !== undefined) {
stream._pendingAbortRequest._resolve();
stream._pendingAbortRequest = undefined;
}
}
stream._state = 'closed';
const writer = stream._writer;
if (writer !== undefined) {
defaultWriterClosedPromiseResolve(writer);
}
}
function WritableStreamFinishInFlightCloseWithError(stream, error) {
stream._inFlightCloseRequest._reject(error);
stream._inFlightCloseRequest = undefined;
// Never execute sink abort() after sink close().
if (stream._pendingAbortRequest !== undefined) {
stream._pendingAbortRequest._reject(error);
stream._pendingAbortRequest = undefined;
}
WritableStreamDealWithRejection(stream, error);
}
// TODO(ricea): Fix alphabetical order.
function WritableStreamCloseQueuedOrInFlight(stream) {
if (stream._closeRequest === undefined && stream._inFlightCloseRequest === undefined) {
return false;
}
return true;
}
function WritableStreamHasOperationMarkedInFlight(stream) {
if (stream._inFlightWriteRequest === undefined && stream._inFlightCloseRequest === undefined) {
return false;
}
return true;
}
function WritableStreamMarkCloseRequestInFlight(stream) {
stream._inFlightCloseRequest = stream._closeRequest;
stream._closeRequest = undefined;
}
function WritableStreamMarkFirstWriteRequestInFlight(stream) {
stream._inFlightWriteRequest = stream._writeRequests.shift();
}
function WritableStreamRejectCloseAndClosedPromiseIfNeeded(stream) {
if (stream._closeRequest !== undefined) {
stream._closeRequest._reject(stream._storedError);
stream._closeRequest = undefined;
}
const writer = stream._writer;
if (writer !== undefined) {
defaultWriterClosedPromiseReject(writer, stream._storedError);
}
}
function WritableStreamUpdateBackpressure(stream, backpressure) {
const writer = stream._writer;
if (writer !== undefined && backpressure !== stream._backpressure) {
if (backpressure) {
defaultWriterReadyPromiseReset(writer);
}
else {
defaultWriterReadyPromiseResolve(writer);
}
}
stream._backpressure = backpressure;
}
/**
* A default writer vended by a {@link WritableStream}.
*
* @public
*/
class WritableStreamDefaultWriter {
constructor(stream) {
assertRequiredArgument(stream, 1, 'WritableStreamDefaultWriter');
assertWritableStream(stream, 'First parameter');
if (IsWritableStreamLocked(stream)) {
throw new TypeError('This stream has already been locked for exclusive writing by another writer');
}
this._ownerWritableStream = stream;
stream._writer = this;
const state = stream._state;
if (state === 'writable') {
if (!WritableStreamCloseQueuedOrInFlight(stream) && stream._backpressure) {
defaultWriterReadyPromiseInitialize(this);
}
else {
defaultWriterReadyPromiseInitializeAsResolved(this);
}
defaultWriterClosedPromiseInitialize(this);
}
else if (state === 'erroring') {
defaultWriterReadyPromiseInitializeAsRejected(this, stream._storedError);
defaultWriterClosedPromiseInitialize(this);
}
else if (state === 'closed') {
defaultWriterReadyPromiseInitializeAsResolved(this);
defaultWriterClosedPromiseInitializeAsResolved(this);
}
else {
const storedError = stream._storedError;
defaultWriterReadyPromiseInitializeAsRejected(this, storedError);
defaultWriterClosedPromiseInitializeAsRejected(this, storedError);
}
}
/**
* Returns a promise that will be fulfilled when the stream becomes closed, or rejected if the stream ever errors or
* the writer’s lock is released before the stream finishes closing.
*/
get closed() {
if (!IsWritableStreamDefaultWriter(this)) {
return promiseRejectedWith(defaultWriterBrandCheckException('closed'));
}
return this._closedPromise;
}
/**
* Returns the desired size to fill the stream’s internal queue. It can be negative, if the queue is over-full.
* A producer can use this information to determine the right amount of data to write.
*
* It will be `null` if the stream cannot be successfully written to (due to either being errored, or having an abort
* queued up). It will return zero if the stream is closed. And the getter will throw an exception if invoked when
* the writer’s lock is released.
*/
get desiredSize() {
if (!IsWritableStreamDefaultWriter(this)) {
throw defaultWriterBrandCheckException('desiredSize');
}
if (this._ownerWritableStream === undefined) {
throw defaultWriterLockException('desiredSize');
}
return WritableStreamDefaultWriterGetDesiredSize(this);
}
/**
* Returns a promise that will be fulfilled when the desired size to fill the stream’s internal queue transitions
* from non-positive to positive, signaling that it is no longer applying backpressure. Once the desired size dips
* back to zero or below, the getter will return a new promise that stays pending until the next transition.
*
* If the stream becomes errored or aborted, or the writer’s lock is released, the returned promise will become
* rejected.
*/
get ready() {
if (!IsWritableStreamDefaultWriter(this)) {
return promiseRejectedWith(defaultWriterBrandCheckException('ready'));
}
return this._readyPromise;
}
/**
* If the reader is active, behaves the same as {@link WritableStream.abort | stream.abort(reason)}.
*/
abort(reason = undefined) {
if (!IsWritableStreamDefaultWriter(this)) {
return promiseRejectedWith(defaultWriterBrandCheckException('abort'));
}
if (this._ownerWritableStream === undefined) {
return promiseRejectedWith(defaultWriterLockException('abort'));
}
return WritableStreamDefaultWriterAbort(this, reason);
}
/**
* If the reader is active, behaves the same as {@link WritableStream.close | stream.close()}.
*/
close() {
if (!IsWritableStreamDefaultWriter(this)) {
return promiseRejectedWith(defaultWriterBrandCheckException('close'));
}
const stream = this._ownerWritableStream;
if (stream === undefined) {
return promiseRejectedWith(defaultWriterLockException('close'));
}
if (WritableStreamCloseQueuedOrInFlight(stream)) {
return promiseRejectedWith(new TypeError('Cannot close an already-closing stream'));
}
return WritableStreamDefaultWriterClose(this);
}
/**
* Releases the writer’s lock on the corresponding stream. After the lock is released, the writer is no longer active.
* If the associated stream is errored when the lock is released, the writer will appear errored in the same way from
* now on; otherwise, the writer will appear closed.
*
* Note that the lock can still be released even if some ongoing writes have not yet finished (i.e. even if the
* promises returned from previous calls to {@link WritableStreamDefaultWriter.write | write()} have not yet settled).
* It’s not necessary to hold the lock on the writer for the duration of the write; the lock instead simply prevents
* other producers from writing in an interleaved manner.
*/
releaseLock() {
if (!IsWritableStreamDefaultWriter(this)) {
throw defaultWriterBrandCheckException('releaseLock');
}
const stream = this._ownerWritableStream;
if (stream === undefined) {
return;
}
WritableStreamDefaultWriterRelease(this);
}
write(chunk = undefined) {
if (!IsWritableStreamDefaultWriter(this)) {
return promiseRejectedWith(defaultWriterBrandCheckException('write'));
}
if (this._ownerWritableStream === undefined) {
return promiseRejectedWith(defaultWriterLockException('write to'));
}
return WritableStreamDefaultWriterWrite(this, chunk);
}
}
Object.defineProperties(WritableStreamDefaultWriter.prototype, {
abort: { enumerable: true },
close: { enumerable: true },
releaseLock: { enumerable: true },
write: { enumerable: true },
closed: { enumerable: true },
desiredSize: { enumerable: true },
ready: { enumerable: true }
});
if (typeof SymbolPolyfill.toStringTag === 'symbol') {
Object.defineProperty(WritableStreamDefaultWriter.prototype, SymbolPolyfill.toStringTag, {
value: 'WritableStreamDefaultWriter',
configurable: true
});
}
// Abstract operations for the WritableStreamDefaultWriter.
function IsWritableStreamDefaultWriter(x) {
if (!typeIsObject(x)) {
return false;
}
if (!Object.prototype.hasOwnProperty.call(x, '_ownerWritableStream')) {
return false;
}
return x instanceof WritableStreamDefaultWriter;
}
// A client of WritableStreamDefaultWriter may use these functions directly to bypass state check.
function WritableStreamDefaultWriterAbort(writer, reason) {
const stream = writer._ownerWritableStream;
return WritableStreamAbort(stream, reason);
}
function WritableStreamDefaultWriterClose(writer) {
const stream = writer._ownerWritableStream;
return WritableStreamClose(stream);
}
function WritableStreamDefaultWriterCloseWithErrorPropagation(writer) {
const stream = writer._ownerWritableStream;
const state = stream._state;
if (WritableStreamCloseQueuedOrInFlight(stream) || state === 'closed') {
return promiseResolvedWith(undefined);
}
if (state === 'errored') {
return promiseRejectedWith(stream._storedError);
}
return WritableStreamDefaultWriterClose(writer);
}
function WritableStreamDefaultWriterEnsureClosedPromiseRejected(writer, error) {
if (writer._closedPromiseState === 'pending') {
defaultWriterClosedPromiseReject(writer, error);
}
else {
defaultWriterClosedPromiseResetToRejected(writer, error);
}
}
function WritableStreamDefaultWriterEnsureReadyPromiseRejected(writer, error) {
if (writer._readyPromiseState === 'pending') {
defaultWriterReadyPromiseReject(writer, error);
}
else {
defaultWriterReadyPromiseResetToRejected(writer, error);
}
}
function WritableStreamDefaultWriterGetDesiredSize(writer) {
const stream = writer._ownerWritableStream;
const state = stream._state;
if (state === 'errored' || state === 'erroring') {
return null;
}
if (state === 'closed') {
return 0;
}
return WritableStreamDefaultControllerGetDesiredSize(stream._writableStreamController);
}
function WritableStreamDefaultWriterRelease(writer) {
const stream = writer._ownerWritableStream;
const releasedError = new TypeError(`Writer was released and can no longer be used to monitor the stream's closedness`);
WritableStreamDefaultWriterEnsureReadyPromiseRejected(writer, releasedError);
// The state transitions to "errored" before the sink abort() method runs, but the writer.closed promise is not
// rejected until afterwards. This means that simply testing state will not work.
WritableStreamDefaultWriterEnsureClosedPromiseRejected(writer, releasedError);
stream._writer = undefined;
writer._ownerWritableStream = undefined;
}
function WritableStreamDefaultWriterWrite(writer, chunk) {
const stream = writer._ownerWritableStream;
const controller = stream._writableStreamController;
const chunkSize = WritableStreamDefaultControllerGetChunkSize(controller, chunk);
if (stream !== writer._ownerWritableStream) {
return promiseRejectedWith(defaultWriterLockException('write to'));
}
const state = stream._state;
if (state === 'errored') {
return promiseRejectedWith(stream._storedError);
}
if (WritableStreamCloseQueuedOrInFlight(stream) || state === 'closed') {
return promiseRejectedWith(new TypeError('The stream is closing or closed and cannot be written to'));
}
if (state === 'erroring') {
return promiseRejectedWith(stream._storedError);
}
const promise = WritableStreamAddWriteRequest(stream);
WritableStreamDefaultControllerWrite(controller, chunk, chunkSize);
return promise;
}
const closeSentinel = {};
/**
* Allows control of a {@link WritableStream | writable stream}'s state and internal queue.
*
* @public
*/
class WritableStreamDefaultController {
constructor() {
throw new TypeError('Illegal constructor');
}
/**
* The reason which was passed to `WritableStream.abort(reason)` when the stream was aborted.
*
* @deprecated
* This property has been removed from the specification, see https://github.com/whatwg/streams/pull/1177.
* Use {@link WritableStreamDefaultController.signal}'s `reason` instead.
*/
get abortReason() {
if (!IsWritableStreamDefaultController(this)) {
throw defaultControllerBrandCheckException$2('abortReason');
}
return this._abortReason;
}
/**
* An `AbortSignal` that can be used to abort the pending write or close operation when the stream is aborted.
*/
get signal() {
if (!IsWritableStreamDefaultController(this)) {
throw defaultControllerBrandCheckException$2('signal');
}
if (this._abortController === undefined) {
// Older browsers or older Node versions may not support `AbortController` or `AbortSignal`.
// We don't want to bundle and ship an `AbortController` polyfill together with our polyfill,
// so instead we only implement support for `signal` if we find a global `AbortController` constructor.
throw new TypeError('WritableStreamDefaultController.prototype.signal is not supported');
}
return this._abortController.signal;
}
/**
* Closes the controlled writable stream, making all future interactions with it fail with the given error `e`.
*
* This method is rarely used, since usually it suffices to return a rejected promise from one of the underlying
* sink's methods. However, it can be useful for suddenly shutting down a stream in response to an event outside the
* normal lifecycle of interactions with the underlying sink.
*/
error(e = undefined) {
if (!IsWritableStreamDefaultController(this)) {
throw defaultControllerBrandCheckException$2('error');
}
const state = this._controlledWritableStream._state;
if (state !== 'writable') {
// The stream is closed, errored or will be soon. The sink can't do anything useful if it gets an error here, so
// just treat it as a no-op.
return;
}
WritableStreamDefaultControllerError(this, e);
}
/** @internal */
[AbortSteps](reason) {
const result = this._abortAlgorithm(reason);
WritableStreamDefaultControllerClearAlgorithms(this);
return result;
}
/** @internal */
[ErrorSteps]() {
ResetQueue(this);
}
}
Object.defineProperties(WritableStreamDefaultController.prototype, {
abortReason: { enumerable: true },
signal: { enumerable: true },
error: { enumerable: true }
});
if (typeof SymbolPolyfill.toStringTag === 'symbol') {
Object.defineProperty(WritableStreamDefaultController.prototype, SymbolPolyfill.toStringTag, {
value: 'WritableStreamDefaultController',
configurable: true
});
}
// Abstract operations implementing interface required by the WritableStream.
function IsWritableStreamDefaultController(x) {
if (!typeIsObject(x)) {
return false;
}
if (!Object.prototype.hasOwnProperty.call(x, '_controlledWritableStream')) {
return false;
}
return x instanceof WritableStreamDefaultController;
}
function SetUpWritableStreamDefaultController(stream, controller, startAlgorithm, writeAlgorithm, closeAlgorithm, abortAlgorithm, highWaterMark, sizeAlgorithm) {
controller._controlledWritableStream = stream;
stream._writableStreamController = controller;
// Need to set the slots so that the assert doesn't fire. In the spec the slots already exist implicitly.
controller._queue = undefined;
controller._queueTotalSize = undefined;
ResetQueue(controller);
controller._abortReason = undefined;
controller._abortController = createAbortController();
controller._started = false;
controller._strategySizeAlgorithm = sizeAlgorithm;
controller._strategyHWM = highWaterMark;
controller._writeAlgorithm = writeAlgorithm;
controller._closeAlgorithm = closeAlgorithm;
controller._abortAlgorithm = abortAlgorithm;
const backpressure = WritableStreamDefaultControllerGetBackpressure(controller);
WritableStreamUpdateBackpressure(stream, backpressure);
const startResult = startAlgorithm();
const startPromise = promiseResolvedWith(startResult);
uponPromise(startPromise, () => {
controller._started = true;
WritableStreamDefaultControllerAdvanceQueueIfNeeded(controller);
}, r => {
controller._started = true;
WritableStreamDealWithRejection(stream, r);
});
}
function SetUpWritableStreamDefaultControllerFromUnderlyingSink(stream, underlyingSink, highWaterMark, sizeAlgorithm) {
const controller = Object.create(WritableStreamDefaultController.prototype);
let startAlgorithm = () => undefined;
let writeAlgorithm = () => promiseResolvedWith(undefined);
let closeAlgorithm = () => promiseResolvedWith(undefined);
let abortAlgorithm = () => promiseResolvedWith(undefined);
if (underlyingSink.start !== undefined) {
startAlgorithm = () => underlyingSink.start(controller);
}
if (underlyingSink.write !== undefined) {
writeAlgorithm = chunk => underlyingSink.write(chunk, controller);
}
if (underlyingSink.close !== undefined) {
closeAlgorithm = () => underlyingSink.close();
}
if (underlyingSink.abort !== undefined) {
abortAlgorithm = reason => underlyingSink.abort(reason);
}
SetUpWritableStreamDefaultController(stream, controller, startAlgorithm, writeAlgorithm, closeAlgorithm, abortAlgorithm, highWaterMark, sizeAlgorithm);
}
// ClearAlgorithms may be called twice. Erroring the same stream in multiple ways will often result in redundant calls.
function WritableStreamDefaultControllerClearAlgorithms(controller) {
controller._writeAlgorithm = undefined;
controller._closeAlgorithm = undefined;
controller._abortAlgorithm = undefined;
controller._strategySizeAlgorithm = undefined;
}
function WritableStreamDefaultControllerClose(controller) {
EnqueueValueWithSize(controller, closeSentinel, 0);
WritableStreamDefaultControllerAdvanceQueueIfNeeded(controller);
}
function WritableStreamDefaultControllerGetChunkSize(controller, chunk) {
try {
return controller._strategySizeAlgorithm(chunk);
}
catch (chunkSizeE) {
WritableStreamDefaultControllerErrorIfNeeded(controller, chunkSizeE);
return 1;
}
}
function WritableStreamDefaultControllerGetDesiredSize(controller) {
return controller._strategyHWM - controller._queueTotalSize;
}
function WritableStreamDefaultControllerWrite(controller, chunk, chunkSize) {
try {
EnqueueValueWithSize(controller, chunk, chunkSize);
}
catch (enqueueE) {
WritableStreamDefaultControllerErrorIfNeeded(controller, enqueueE);
return;
}
const stream = controller._controlledWritableStream;
if (!WritableStreamCloseQueuedOrInFlight(stream) && stream._state === 'writable') {
const backpressure = WritableStreamDefaultControllerGetBackpressure(controller);
WritableStreamUpdateBackpressure(stream, backpressure);
}
WritableStreamDefaultControllerAdvanceQueueIfNeeded(controller);
}
// Abstract operations for the WritableStreamDefaultController.
function WritableStreamDefaultControllerAdvanceQueueIfNeeded(controller) {
const stream = controller._controlledWritableStream;
if (!controller._started) {
return;
}
if (stream._inFlightWriteRequest !== undefined) {
return;
}
const state = stream._state;
if (state === 'erroring') {
WritableStreamFinishErroring(stream);
return;
}
if (controller._queue.length === 0) {
return;
}
const value = PeekQueueValue(controller);
if (value === closeSentinel) {
WritableStreamDefaultControllerProcessClose(controller);
}
else {
WritableStreamDefaultControllerProcessWrite(controller, value);
}
}
function WritableStreamDefaultControllerErrorIfNeeded(controller, error) {
if (controller._controlledWritableStream._state === 'writable') {
WritableStreamDefaultControllerError(controller, error);
}
}
function WritableStreamDefaultControllerProcessClose(controller) {
const stream = controller._controlledWritableStream;
WritableStreamMarkCloseRequestInFlight(stream);
DequeueValue(controller);
const sinkClosePromise = controller._closeAlgorithm();
WritableStreamDefaultControllerClearAlgorithms(controller);
uponPromise(sinkClosePromise, () => {
WritableStreamFinishInFlightClose(stream);
}, reason => {
WritableStreamFinishInFlightCloseWithError(stream, reason);
});
}
function WritableStreamDefaultControllerProcessWrite(controller, chunk) {
const stream = controller._controlledWritableStream;
WritableStreamMarkFirstWriteRequestInFlight(stream);
const sinkWritePromise = controller._writeAlgorithm(chunk);
uponPromise(sinkWritePromise, () => {
WritableStreamFinishInFlightWrite(stream);
const state = stream._state;
DequeueValue(controller);
if (!WritableStreamCloseQueuedOrInFlight(stream) && state === 'writable') {
const backpressure = WritableStreamDefaultControllerGetBackpressure(controller);
WritableStreamUpdateBackpressure(stream, backpressure);
}
WritableStreamDefaultControllerAdvanceQueueIfNeeded(controller);
}, reason => {
if (stream._state === 'writable') {
WritableStreamDefaultControllerClearAlgorithms(controller);
}
WritableStreamFinishInFlightWriteWithError(stream, reason);
});
}
function WritableStreamDefaultControllerGetBackpressure(controller) {
const desiredSize = WritableStreamDefaultControllerGetDesiredSize(controller);
return desiredSize <= 0;
}
// A client of WritableStreamDefaultController may use these functions directly to bypass state check.
function WritableStreamDefaultControllerError(controller, error) {
const stream = controller._controlledWritableStream;
WritableStreamDefaultControllerClearAlgorithms(controller);
WritableStreamStartErroring(stream, error);
}
// Helper functions for the WritableStream.
function streamBrandCheckException$2(name) {
return new TypeError(`WritableStream.prototype.${name} can only be used on a WritableStream`);
}
// Helper functions for the WritableStreamDefaultController.
function defaultControllerBrandCheckException$2(name) {
return new TypeError(`WritableStreamDefaultController.prototype.${name} can only be used on a WritableStreamDefaultController`);
}
// Helper functions for the WritableStreamDefaultWriter.
function defaultWriterBrandCheckException(name) {
return new TypeError(`WritableStreamDefaultWriter.prototype.${name} can only be used on a WritableStreamDefaultWriter`);
}
function defaultWriterLockException(name) {
return new TypeError('Cannot ' + name + ' a stream using a released writer');
}
function defaultWriterClosedPromiseInitialize(writer) {
writer._closedPromise = newPromise((resolve, reject) => {
writer._closedPromise_resolve = resolve;
writer._closedPromise_reject = reject;
writer._closedPromiseState = 'pending';
});
}
function defaultWriterClosedPromiseInitializeAsRejected(writer, reason) {
defaultWriterClosedPromiseInitialize(writer);
defaultWriterClosedPromiseReject(writer, reason);
}
function defaultWriterClosedPromiseInitializeAsResolved(writer) {
defaultWriterClosedPromiseInitialize(writer);
defaultWriterClosedPromiseResolve(writer);
}
function defaultWriterClosedPromiseReject(writer, reason) {
if (writer._closedPromise_reject === undefined) {
return;
}
setPromiseIsHandledToTrue(writer._closedPromise);
writer._closedPromise_reject(reason);
writer._closedPromise_resolve = undefined;
writer._closedPromise_reject = undefined;
writer._closedPromiseState = 'rejected';
}
function defaultWriterClosedPromiseResetToRejected(writer, reason) {
defaultWriterClosedPromiseInitializeAsRejected(writer, reason);
}
function defaultWriterClosedPromiseResolve(writer) {
if (writer._closedPromise_resolve === undefined) {
return;
}
writer._closedPromise_resolve(undefined);
writer._closedPromise_resolve = undefined;
writer._closedPromise_reject = undefined;
writer._closedPromiseState = 'resolved';
}
function defaultWriterReadyPromiseInitialize(writer) {
writer._readyPromise = newPromise((resolve, reject) => {
writer._readyPromise_resolve = resolve;
writer._readyPromise_reject = reject;
});
writer._readyPromiseState = 'pending';
}
function defaultWriterReadyPromiseInitializeAsRejected(writer, reason) {
defaultWriterReadyPromiseInitialize(writer);
defaultWriterReadyPromiseReject(writer, reason);
}
function defaultWriterReadyPromiseInitializeAsResolved(writer) {
defaultWriterReadyPromiseInitialize(writer);
defaultWriterReadyPromiseResolve(writer);
}
function defaultWriterReadyPromiseReject(writer, reason) {
if (writer._readyPromise_reject === undefined) {
return;
}
setPromiseIsHandledToTrue(writer._readyPromise);
writer._readyPromise_reject(reason);
writer._readyPromise_resolve = undefined;
writer._readyPromise_reject = undefined;
writer._readyPromiseState = 'rejected';
}
function defaultWriterReadyPromiseReset(writer) {
defaultWriterReadyPromiseInitialize(writer);
}
function defaultWriterReadyPromiseResetToRejected(writer, reason) {
defaultWriterReadyPromiseInitializeAsRejected(writer, reason);
}
function defaultWriterReadyPromiseResolve(writer) {
if (writer._readyPromise_resolve === undefined) {
return;
}
writer._readyPromise_resolve(undefined);
writer._readyPromise_resolve = undefined;
writer._readyPromise_reject = undefined;
writer._readyPromiseState = 'fulfilled';
}
///
const NativeDOMException = typeof DOMException !== 'undefined' ? DOMException : undefined;
///
function isDOMExceptionConstructor(ctor) {
if (!(typeof ctor === 'function' || typeof ctor === 'object')) {
return false;
}
try {
new ctor();
return true;
}
catch (_a) {
return false;
}
}
function createDOMExceptionPolyfill() {
// eslint-disable-next-line no-shadow
const ctor = function DOMException(message, name) {
this.message = message || '';
this.name = name || 'Error';
if (Error.captureStackTrace) {
Error.captureStackTrace(this, this.constructor);
}
};
ctor.prototype = Object.create(Error.prototype);
Object.defineProperty(ctor.prototype, 'constructor', { value: ctor, writable: true, configurable: true });
return ctor;
}
// eslint-disable-next-line no-redeclare
const DOMException$1 = isDOMExceptionConstructor(NativeDOMException) ? NativeDOMException : createDOMExceptionPolyfill();
function ReadableStreamPipeTo(source, dest, preventClose, preventAbort, preventCancel, signal) {
const reader = AcquireReadableStreamDefaultReader(source);
const writer = AcquireWritableStreamDefaultWriter(dest);
source._disturbed = true;
let shuttingDown = false;
// This is used to keep track of the spec's requirement that we wait for ongoing writes during shutdown.
let currentWrite = promiseResolvedWith(undefined);
return newPromise((resolve, reject) => {
let abortAlgorithm;
if (signal !== undefined) {
abortAlgorithm = () => {
const error = new DOMException$1('Aborted', 'AbortError');
const actions = [];
if (!preventAbort) {
actions.push(() => {
if (dest._state === 'writable') {
return WritableStreamAbort(dest, error);
}
return promiseResolvedWith(undefined);
});
}
if (!preventCancel) {
actions.push(() => {
if (source._state === 'readable') {
return ReadableStreamCancel(source, error);
}
return promiseResolvedWith(undefined);
});
}
shutdownWithAction(() => Promise.all(actions.map(action => action())), true, error);
};
if (signal.aborted) {
abortAlgorithm();
return;
}
signal.addEventListener('abort', abortAlgorithm);
}
// Using reader and writer, read all chunks from this and write them to dest
// - Backpressure must be enforced
// - Shutdown must stop all activity
function pipeLoop() {
return newPromise((resolveLoop, rejectLoop) => {
function next(done) {
if (done) {
resolveLoop();
}
else {
// Use `PerformPromiseThen` instead of `uponPromise` to avoid
// adding unnecessary `.catch(rethrowAssertionErrorRejection)` handlers
PerformPromiseThen(pipeStep(), next, rejectLoop);
}
}
next(false);
});
}
function pipeStep() {
if (shuttingDown) {
return promiseResolvedWith(true);
}
return PerformPromiseThen(writer._readyPromise, () => {
return newPromise((resolveRead, rejectRead) => {
ReadableStreamDefaultReaderRead(reader, {
_chunkSteps: chunk => {
currentWrite = PerformPromiseThen(WritableStreamDefaultWriterWrite(writer, chunk), undefined, noop);
resolveRead(false);
},
_closeSteps: () => resolveRead(true),
_errorSteps: rejectRead
});
});
});
}
// Errors must be propagated forward
isOrBecomesErrored(source, reader._closedPromise, storedError => {
if (!preventAbort) {
shutdownWithAction(() => WritableStreamAbort(dest, storedError), true, storedError);
}
else {
shutdown(true, storedError);
}
});
// Errors must be propagated backward
isOrBecomesErrored(dest, writer._closedPromise, storedError => {
if (!preventCancel) {
shutdownWithAction(() => ReadableStreamCancel(source, storedError), true, storedError);
}
else {
shutdown(true, storedError);
}
});
// Closing must be propagated forward
isOrBecomesClosed(source, reader._closedPromise, () => {
if (!preventClose) {
shutdownWithAction(() => WritableStreamDefaultWriterCloseWithErrorPropagation(writer));
}
else {
shutdown();
}
});
// Closing must be propagated backward
if (WritableStreamCloseQueuedOrInFlight(dest) || dest._state === 'closed') {
const destClosed = new TypeError('the destination writable stream closed before all data could be piped to it');
if (!preventCancel) {
shutdownWithAction(() => ReadableStreamCancel(source, destClosed), true, destClosed);
}
else {
shutdown(true, destClosed);
}
}
setPromiseIsHandledToTrue(pipeLoop());
function waitForWritesToFinish() {
// Another write may have started while we were waiting on this currentWrite, so we have to be sure to wait
// for that too.
const oldCurrentWrite = currentWrite;
return PerformPromiseThen(currentWrite, () => oldCurrentWrite !== currentWrite ? waitForWritesToFinish() : undefined);
}
function isOrBecomesErrored(stream, promise, action) {
if (stream._state === 'errored') {
action(stream._storedError);
}
else {
uponRejection(promise, action);
}
}
function isOrBecomesClosed(stream, promise, action) {
if (stream._state === 'closed') {
action();
}
else {
uponFulfillment(promise, action);
}
}
function shutdownWithAction(action, originalIsError, originalError) {
if (shuttingDown) {
return;
}
shuttingDown = true;
if (dest._state === 'writable' && !WritableStreamCloseQueuedOrInFlight(dest)) {
uponFulfillment(waitForWritesToFinish(), doTheRest);
}
else {
doTheRest();
}
function doTheRest() {
uponPromise(action(), () => finalize(originalIsError, originalError), newError => finalize(true, newError));
}
}
function shutdown(isError, error) {
if (shuttingDown) {
return;
}
shuttingDown = true;
if (dest._state === 'writable' && !WritableStreamCloseQueuedOrInFlight(dest)) {
uponFulfillment(waitForWritesToFinish(), () => finalize(isError, error));
}
else {
finalize(isError, error);
}
}
function finalize(isError, error) {
WritableStreamDefaultWriterRelease(writer);
ReadableStreamReaderGenericRelease(reader);
if (signal !== undefined) {
signal.removeEventListener('abort', abortAlgorithm);
}
if (isError) {
reject(error);
}
else {
resolve(undefined);
}
}
});
}
/**
* Allows control of a {@link ReadableStream | readable stream}'s state and internal queue.
*
* @public
*/
class ReadableStreamDefaultController {
constructor() {
throw new TypeError('Illegal constructor');
}
/**
* Returns the desired size to fill the controlled stream's internal queue. It can be negative, if the queue is
* over-full. An underlying source ought to use this information to determine when and how to apply backpressure.
*/
get desiredSize() {
if (!IsReadableStreamDefaultController(this)) {
throw defaultControllerBrandCheckException$1('desiredSize');
}
return ReadableStreamDefaultControllerGetDesiredSize(this);
}
/**
* Closes the controlled readable stream. Consumers will still be able to read any previously-enqueued chunks from
* the stream, but once those are read, the stream will become closed.
*/
close() {
if (!IsReadableStreamDefaultController(this)) {
throw defaultControllerBrandCheckException$1('close');
}
if (!ReadableStreamDefaultControllerCanCloseOrEnqueue(this)) {
throw new TypeError('The stream is not in a state that permits close');
}
ReadableStreamDefaultControllerClose(this);
}
enqueue(chunk = undefined) {
if (!IsReadableStreamDefaultController(this)) {
throw defaultControllerBrandCheckException$1('enqueue');
}
if (!ReadableStreamDefaultControllerCanCloseOrEnqueue(this)) {
throw new TypeError('The stream is not in a state that permits enqueue');
}
return ReadableStreamDefaultControllerEnqueue(this, chunk);
}
/**
* Errors the controlled readable stream, making all future interactions with it fail with the given error `e`.
*/
error(e = undefined) {
if (!IsReadableStreamDefaultController(this)) {
throw defaultControllerBrandCheckException$1('error');
}
ReadableStreamDefaultControllerError(this, e);
}
/** @internal */
[CancelSteps](reason) {
ResetQueue(this);
const result = this._cancelAlgorithm(reason);
ReadableStreamDefaultControllerClearAlgorithms(this);
return result;
}
/** @internal */
[PullSteps](readRequest) {
const stream = this._controlledReadableStream;
if (this._queue.length > 0) {
const chunk = DequeueValue(this);
if (this._closeRequested && this._queue.length === 0) {
ReadableStreamDefaultControllerClearAlgorithms(this);
ReadableStreamClose(stream);
}
else {
ReadableStreamDefaultControllerCallPullIfNeeded(this);
}
readRequest._chunkSteps(chunk);
}
else {
ReadableStreamAddReadRequest(stream, readRequest);
ReadableStreamDefaultControllerCallPullIfNeeded(this);
}
}
}
Object.defineProperties(ReadableStreamDefaultController.prototype, {
close: { enumerable: true },
enqueue: { enumerable: true },
error: { enumerable: true },
desiredSize: { enumerable: true }
});
if (typeof SymbolPolyfill.toStringTag === 'symbol') {
Object.defineProperty(ReadableStreamDefaultController.prototype, SymbolPolyfill.toStringTag, {
value: 'ReadableStreamDefaultController',
configurable: true
});
}
// Abstract operations for the ReadableStreamDefaultController.
function IsReadableStreamDefaultController(x) {
if (!typeIsObject(x)) {
return false;
}
if (!Object.prototype.hasOwnProperty.call(x, '_controlledReadableStream')) {
return false;
}
return x instanceof ReadableStreamDefaultController;
}
function ReadableStreamDefaultControllerCallPullIfNeeded(controller) {
const shouldPull = ReadableStreamDefaultControllerShouldCallPull(controller);
if (!shouldPull) {
return;
}
if (controller._pulling) {
controller._pullAgain = true;
return;
}
controller._pulling = true;
const pullPromise = controller._pullAlgorithm();
uponPromise(pullPromise, () => {
controller._pulling = false;
if (controller._pullAgain) {
controller._pullAgain = false;
ReadableStreamDefaultControllerCallPullIfNeeded(controller);
}
}, e => {
ReadableStreamDefaultControllerError(controller, e);
});
}
function ReadableStreamDefaultControllerShouldCallPull(controller) {
const stream = controller._controlledReadableStream;
if (!ReadableStreamDefaultControllerCanCloseOrEnqueue(controller)) {
return false;
}
if (!controller._started) {
return false;
}
if (IsReadableStreamLocked(stream) && ReadableStreamGetNumReadRequests(stream) > 0) {
return true;
}
const desiredSize = ReadableStreamDefaultControllerGetDesiredSize(controller);
if (desiredSize > 0) {
return true;
}
return false;
}
function ReadableStreamDefaultControllerClearAlgorithms(controller) {
controller._pullAlgorithm = undefined;
controller._cancelAlgorithm = undefined;
controller._strategySizeAlgorithm = undefined;
}
// A client of ReadableStreamDefaultController may use these functions directly to bypass state check.
function ReadableStreamDefaultControllerClose(controller) {
if (!ReadableStreamDefaultControllerCanCloseOrEnqueue(controller)) {
return;
}
const stream = controller._controlledReadableStream;
controller._closeRequested = true;
if (controller._queue.length === 0) {
ReadableStreamDefaultControllerClearAlgorithms(controller);
ReadableStreamClose(stream);
}
}
function ReadableStreamDefaultControllerEnqueue(controller, chunk) {
if (!ReadableStreamDefaultControllerCanCloseOrEnqueue(controller)) {
return;
}
const stream = controller._controlledReadableStream;
if (IsReadableStreamLocked(stream) && ReadableStreamGetNumReadRequests(stream) > 0) {
ReadableStreamFulfillReadRequest(stream, chunk, false);
}
else {
let chunkSize;
try {
chunkSize = controller._strategySizeAlgorithm(chunk);
}
catch (chunkSizeE) {
ReadableStreamDefaultControllerError(controller, chunkSizeE);
throw chunkSizeE;
}
try {
EnqueueValueWithSize(controller, chunk, chunkSize);
}
catch (enqueueE) {
ReadableStreamDefaultControllerError(controller, enqueueE);
throw enqueueE;
}
}
ReadableStreamDefaultControllerCallPullIfNeeded(controller);
}
function ReadableStreamDefaultControllerError(controller, e) {
const stream = controller._controlledReadableStream;
if (stream._state !== 'readable') {
return;
}
ResetQueue(controller);
ReadableStreamDefaultControllerClearAlgorithms(controller);
ReadableStreamError(stream, e);
}
function ReadableStreamDefaultControllerGetDesiredSize(controller) {
const state = controller._controlledReadableStream._state;
if (state === 'errored') {
return null;
}
if (state === 'closed') {
return 0;
}
return controller._strategyHWM - controller._queueTotalSize;
}
// This is used in the implementation of TransformStream.
function ReadableStreamDefaultControllerHasBackpressure(controller) {
if (ReadableStreamDefaultControllerShouldCallPull(controller)) {
return false;
}
return true;
}
function ReadableStreamDefaultControllerCanCloseOrEnqueue(controller) {
const state = controller._controlledReadableStream._state;
if (!controller._closeRequested && state === 'readable') {
return true;
}
return false;
}
function SetUpReadableStreamDefaultController(stream, controller, startAlgorithm, pullAlgorithm, cancelAlgorithm, highWaterMark, sizeAlgorithm) {
controller._controlledReadableStream = stream;
controller._queue = undefined;
controller._queueTotalSize = undefined;
ResetQueue(controller);
controller._started = false;
controller._closeRequested = false;
controller._pullAgain = false;
controller._pulling = false;
controller._strategySizeAlgorithm = sizeAlgorithm;
controller._strategyHWM = highWaterMark;
controller._pullAlgorithm = pullAlgorithm;
controller._cancelAlgorithm = cancelAlgorithm;
stream._readableStreamController = controller;
const startResult = startAlgorithm();
uponPromise(promiseResolvedWith(startResult), () => {
controller._started = true;
ReadableStreamDefaultControllerCallPullIfNeeded(controller);
}, r => {
ReadableStreamDefaultControllerError(controller, r);
});
}
function SetUpReadableStreamDefaultControllerFromUnderlyingSource(stream, underlyingSource, highWaterMark, sizeAlgorithm) {
const controller = Object.create(ReadableStreamDefaultController.prototype);
let startAlgorithm = () => undefined;
let pullAlgorithm = () => promiseResolvedWith(undefined);
let cancelAlgorithm = () => promiseResolvedWith(undefined);
if (underlyingSource.start !== undefined) {
startAlgorithm = () => underlyingSource.start(controller);
}
if (underlyingSource.pull !== undefined) {
pullAlgorithm = () => underlyingSource.pull(controller);
}
if (underlyingSource.cancel !== undefined) {
cancelAlgorithm = reason => underlyingSource.cancel(reason);
}
SetUpReadableStreamDefaultController(stream, controller, startAlgorithm, pullAlgorithm, cancelAlgorithm, highWaterMark, sizeAlgorithm);
}
// Helper functions for the ReadableStreamDefaultController.
function defaultControllerBrandCheckException$1(name) {
return new TypeError(`ReadableStreamDefaultController.prototype.${name} can only be used on a ReadableStreamDefaultController`);
}
function ReadableStreamTee(stream, cloneForBranch2) {
if (IsReadableByteStreamController(stream._readableStreamController)) {
return ReadableByteStreamTee(stream);
}
return ReadableStreamDefaultTee(stream);
}
function ReadableStreamDefaultTee(stream, cloneForBranch2) {
const reader = AcquireReadableStreamDefaultReader(stream);
let reading = false;
let readAgain = false;
let canceled1 = false;
let canceled2 = false;
let reason1;
let reason2;
let branch1;
let branch2;
let resolveCancelPromise;
const cancelPromise = newPromise(resolve => {
resolveCancelPromise = resolve;
});
function pullAlgorithm() {
if (reading) {
readAgain = true;
return promiseResolvedWith(undefined);
}
reading = true;
const readRequest = {
_chunkSteps: chunk => {
// This needs to be delayed a microtask because it takes at least a microtask to detect errors (using
// reader._closedPromise below), and we want errors in stream to error both branches immediately. We cannot let
// successful synchronously-available reads get ahead of asynchronously-available errors.
queueMicrotask(() => {
readAgain = false;
const chunk1 = chunk;
const chunk2 = chunk;
// There is no way to access the cloning code right now in the reference implementation.
// If we add one then we'll need an implementation for serializable objects.
// if (!canceled2 && cloneForBranch2) {
// chunk2 = StructuredDeserialize(StructuredSerialize(chunk2));
// }
if (!canceled1) {
ReadableStreamDefaultControllerEnqueue(branch1._readableStreamController, chunk1);
}
if (!canceled2) {
ReadableStreamDefaultControllerEnqueue(branch2._readableStreamController, chunk2);
}
reading = false;
if (readAgain) {
pullAlgorithm();
}
});
},
_closeSteps: () => {
reading = false;
if (!canceled1) {
ReadableStreamDefaultControllerClose(branch1._readableStreamController);
}
if (!canceled2) {
ReadableStreamDefaultControllerClose(branch2._readableStreamController);
}
if (!canceled1 || !canceled2) {
resolveCancelPromise(undefined);
}
},
_errorSteps: () => {
reading = false;
}
};
ReadableStreamDefaultReaderRead(reader, readRequest);
return promiseResolvedWith(undefined);
}
function cancel1Algorithm(reason) {
canceled1 = true;
reason1 = reason;
if (canceled2) {
const compositeReason = CreateArrayFromList([reason1, reason2]);
const cancelResult = ReadableStreamCancel(stream, compositeReason);
resolveCancelPromise(cancelResult);
}
return cancelPromise;
}
function cancel2Algorithm(reason) {
canceled2 = true;
reason2 = reason;
if (canceled1) {
const compositeReason = CreateArrayFromList([reason1, reason2]);
const cancelResult = ReadableStreamCancel(stream, compositeReason);
resolveCancelPromise(cancelResult);
}
return cancelPromise;
}
function startAlgorithm() {
// do nothing
}
branch1 = CreateReadableStream(startAlgorithm, pullAlgorithm, cancel1Algorithm);
branch2 = CreateReadableStream(startAlgorithm, pullAlgorithm, cancel2Algorithm);
uponRejection(reader._closedPromise, (r) => {
ReadableStreamDefaultControllerError(branch1._readableStreamController, r);
ReadableStreamDefaultControllerError(branch2._readableStreamController, r);
if (!canceled1 || !canceled2) {
resolveCancelPromise(undefined);
}
});
return [branch1, branch2];
}
function ReadableByteStreamTee(stream) {
let reader = AcquireReadableStreamDefaultReader(stream);
let reading = false;
let readAgainForBranch1 = false;
let readAgainForBranch2 = false;
let canceled1 = false;
let canceled2 = false;
let reason1;
let reason2;
let branch1;
let branch2;
let resolveCancelPromise;
const cancelPromise = newPromise(resolve => {
resolveCancelPromise = resolve;
});
function forwardReaderError(thisReader) {
uponRejection(thisReader._closedPromise, r => {
if (thisReader !== reader) {
return;
}
ReadableByteStreamControllerError(branch1._readableStreamController, r);
ReadableByteStreamControllerError(branch2._readableStreamController, r);
if (!canceled1 || !canceled2) {
resolveCancelPromise(undefined);
}
});
}
function pullWithDefaultReader() {
if (IsReadableStreamBYOBReader(reader)) {
ReadableStreamReaderGenericRelease(reader);
reader = AcquireReadableStreamDefaultReader(stream);
forwardReaderError(reader);
}
const readRequest = {
_chunkSteps: chunk => {
// This needs to be delayed a microtask because it takes at least a microtask to detect errors (using
// reader._closedPromise below), and we want errors in stream to error both branches immediately. We cannot let
// successful synchronously-available reads get ahead of asynchronously-available errors.
queueMicrotask(() => {
readAgainForBranch1 = false;
readAgainForBranch2 = false;
const chunk1 = chunk;
let chunk2 = chunk;
if (!canceled1 && !canceled2) {
try {
chunk2 = CloneAsUint8Array(chunk);
}
catch (cloneE) {
ReadableByteStreamControllerError(branch1._readableStreamController, cloneE);
ReadableByteStreamControllerError(branch2._readableStreamController, cloneE);
resolveCancelPromise(ReadableStreamCancel(stream, cloneE));
return;
}
}
if (!canceled1) {
ReadableByteStreamControllerEnqueue(branch1._readableStreamController, chunk1);
}
if (!canceled2) {
ReadableByteStreamControllerEnqueue(branch2._readableStreamController, chunk2);
}
reading = false;
if (readAgainForBranch1) {
pull1Algorithm();
}
else if (readAgainForBranch2) {
pull2Algorithm();
}
});
},
_closeSteps: () => {
reading = false;
if (!canceled1) {
ReadableByteStreamControllerClose(branch1._readableStreamController);
}
if (!canceled2) {
ReadableByteStreamControllerClose(branch2._readableStreamController);
}
if (branch1._readableStreamController._pendingPullIntos.length > 0) {
ReadableByteStreamControllerRespond(branch1._readableStreamController, 0);
}
if (branch2._readableStreamController._pendingPullIntos.length > 0) {
ReadableByteStreamControllerRespond(branch2._readableStreamController, 0);
}
if (!canceled1 || !canceled2) {
resolveCancelPromise(undefined);
}
},
_errorSteps: () => {
reading = false;
}
};
ReadableStreamDefaultReaderRead(reader, readRequest);
}
function pullWithBYOBReader(view, forBranch2) {
if (IsReadableStreamDefaultReader(reader)) {
ReadableStreamReaderGenericRelease(reader);
reader = AcquireReadableStreamBYOBReader(stream);
forwardReaderError(reader);
}
const byobBranch = forBranch2 ? branch2 : branch1;
const otherBranch = forBranch2 ? branch1 : branch2;
const readIntoRequest = {
_chunkSteps: chunk => {
// This needs to be delayed a microtask because it takes at least a microtask to detect errors (using
// reader._closedPromise below), and we want errors in stream to error both branches immediately. We cannot let
// successful synchronously-available reads get ahead of asynchronously-available errors.
queueMicrotask(() => {
readAgainForBranch1 = false;
readAgainForBranch2 = false;
const byobCanceled = forBranch2 ? canceled2 : canceled1;
const otherCanceled = forBranch2 ? canceled1 : canceled2;
if (!otherCanceled) {
let clonedChunk;
try {
clonedChunk = CloneAsUint8Array(chunk);
}
catch (cloneE) {
ReadableByteStreamControllerError(byobBranch._readableStreamController, cloneE);
ReadableByteStreamControllerError(otherBranch._readableStreamController, cloneE);
resolveCancelPromise(ReadableStreamCancel(stream, cloneE));
return;
}
if (!byobCanceled) {
ReadableByteStreamControllerRespondWithNewView(byobBranch._readableStreamController, chunk);
}
ReadableByteStreamControllerEnqueue(otherBranch._readableStreamController, clonedChunk);
}
else if (!byobCanceled) {
ReadableByteStreamControllerRespondWithNewView(byobBranch._readableStreamController, chunk);
}
reading = false;
if (readAgainForBranch1) {
pull1Algorithm();
}
else if (readAgainForBranch2) {
pull2Algorithm();
}
});
},
_closeSteps: chunk => {
reading = false;
const byobCanceled = forBranch2 ? canceled2 : canceled1;
const otherCanceled = forBranch2 ? canceled1 : canceled2;
if (!byobCanceled) {
ReadableByteStreamControllerClose(byobBranch._readableStreamController);
}
if (!otherCanceled) {
ReadableByteStreamControllerClose(otherBranch._readableStreamController);
}
if (chunk !== undefined) {
if (!byobCanceled) {
ReadableByteStreamControllerRespondWithNewView(byobBranch._readableStreamController, chunk);
}
if (!otherCanceled && otherBranch._readableStreamController._pendingPullIntos.length > 0) {
ReadableByteStreamControllerRespond(otherBranch._readableStreamController, 0);
}
}
if (!byobCanceled || !otherCanceled) {
resolveCancelPromise(undefined);
}
},
_errorSteps: () => {
reading = false;
}
};
ReadableStreamBYOBReaderRead(reader, view, readIntoRequest);
}
function pull1Algorithm() {
if (reading) {
readAgainForBranch1 = true;
return promiseResolvedWith(undefined);
}
reading = true;
const byobRequest = ReadableByteStreamControllerGetBYOBRequest(branch1._readableStreamController);
if (byobRequest === null) {
pullWithDefaultReader();
}
else {
pullWithBYOBReader(byobRequest._view, false);
}
return promiseResolvedWith(undefined);
}
function pull2Algorithm() {
if (reading) {
readAgainForBranch2 = true;
return promiseResolvedWith(undefined);
}
reading = true;
const byobRequest = ReadableByteStreamControllerGetBYOBRequest(branch2._readableStreamController);
if (byobRequest === null) {
pullWithDefaultReader();
}
else {
pullWithBYOBReader(byobRequest._view, true);
}
return promiseResolvedWith(undefined);
}
function cancel1Algorithm(reason) {
canceled1 = true;
reason1 = reason;
if (canceled2) {
const compositeReason = CreateArrayFromList([reason1, reason2]);
const cancelResult = ReadableStreamCancel(stream, compositeReason);
resolveCancelPromise(cancelResult);
}
return cancelPromise;
}
function cancel2Algorithm(reason) {
canceled2 = true;
reason2 = reason;
if (canceled1) {
const compositeReason = CreateArrayFromList([reason1, reason2]);
const cancelResult = ReadableStreamCancel(stream, compositeReason);
resolveCancelPromise(cancelResult);
}
return cancelPromise;
}
function startAlgorithm() {
return;
}
branch1 = CreateReadableByteStream(startAlgorithm, pull1Algorithm, cancel1Algorithm);
branch2 = CreateReadableByteStream(startAlgorithm, pull2Algorithm, cancel2Algorithm);
forwardReaderError(reader);
return [branch1, branch2];
}
function convertUnderlyingDefaultOrByteSource(source, context) {
assertDictionary(source, context);
const original = source;
const autoAllocateChunkSize = original === null || original === void 0 ? void 0 : original.autoAllocateChunkSize;
const cancel = original === null || original === void 0 ? void 0 : original.cancel;
const pull = original === null || original === void 0 ? void 0 : original.pull;
const start = original === null || original === void 0 ? void 0 : original.start;
const type = original === null || original === void 0 ? void 0 : original.type;
return {
autoAllocateChunkSize: autoAllocateChunkSize === undefined ?
undefined :
convertUnsignedLongLongWithEnforceRange(autoAllocateChunkSize, `${context} has member 'autoAllocateChunkSize' that`),
cancel: cancel === undefined ?
undefined :
convertUnderlyingSourceCancelCallback(cancel, original, `${context} has member 'cancel' that`),
pull: pull === undefined ?
undefined :
convertUnderlyingSourcePullCallback(pull, original, `${context} has member 'pull' that`),
start: start === undefined ?
undefined :
convertUnderlyingSourceStartCallback(start, original, `${context} has member 'start' that`),
type: type === undefined ? undefined : convertReadableStreamType(type, `${context} has member 'type' that`)
};
}
function convertUnderlyingSourceCancelCallback(fn, original, context) {
assertFunction(fn, context);
return (reason) => promiseCall(fn, original, [reason]);
}
function convertUnderlyingSourcePullCallback(fn, original, context) {
assertFunction(fn, context);
return (controller) => promiseCall(fn, original, [controller]);
}
function convertUnderlyingSourceStartCallback(fn, original, context) {
assertFunction(fn, context);
return (controller) => reflectCall(fn, original, [controller]);
}
function convertReadableStreamType(type, context) {
type = `${type}`;
if (type !== 'bytes') {
throw new TypeError(`${context} '${type}' is not a valid enumeration value for ReadableStreamType`);
}
return type;
}
function convertReaderOptions(options, context) {
assertDictionary(options, context);
const mode = options === null || options === void 0 ? void 0 : options.mode;
return {
mode: mode === undefined ? undefined : convertReadableStreamReaderMode(mode, `${context} has member 'mode' that`)
};
}
function convertReadableStreamReaderMode(mode, context) {
mode = `${mode}`;
if (mode !== 'byob') {
throw new TypeError(`${context} '${mode}' is not a valid enumeration value for ReadableStreamReaderMode`);
}
return mode;
}
function convertIteratorOptions(options, context) {
assertDictionary(options, context);
const preventCancel = options === null || options === void 0 ? void 0 : options.preventCancel;
return { preventCancel: Boolean(preventCancel) };
}
function convertPipeOptions(options, context) {
assertDictionary(options, context);
const preventAbort = options === null || options === void 0 ? void 0 : options.preventAbort;
const preventCancel = options === null || options === void 0 ? void 0 : options.preventCancel;
const preventClose = options === null || options === void 0 ? void 0 : options.preventClose;
const signal = options === null || options === void 0 ? void 0 : options.signal;
if (signal !== undefined) {
assertAbortSignal(signal, `${context} has member 'signal' that`);
}
return {
preventAbort: Boolean(preventAbort),
preventCancel: Boolean(preventCancel),
preventClose: Boolean(preventClose),
signal
};
}
function assertAbortSignal(signal, context) {
if (!isAbortSignal(signal)) {
throw new TypeError(`${context} is not an AbortSignal.`);
}
}
function convertReadableWritablePair(pair, context) {
assertDictionary(pair, context);
const readable = pair === null || pair === void 0 ? void 0 : pair.readable;
assertRequiredField(readable, 'readable', 'ReadableWritablePair');
assertReadableStream(readable, `${context} has member 'readable' that`);
const writable = pair === null || pair === void 0 ? void 0 : pair.writable;
assertRequiredField(writable, 'writable', 'ReadableWritablePair');
assertWritableStream(writable, `${context} has member 'writable' that`);
return { readable, writable };
}
/**
* A readable stream represents a source of data, from which you can read.
*
* @public
*/
class ReadableStream {
constructor(rawUnderlyingSource = {}, rawStrategy = {}) {
if (rawUnderlyingSource === undefined) {
rawUnderlyingSource = null;
}
else {
assertObject(rawUnderlyingSource, 'First parameter');
}
const strategy = convertQueuingStrategy(rawStrategy, 'Second parameter');
const underlyingSource = convertUnderlyingDefaultOrByteSource(rawUnderlyingSource, 'First parameter');
InitializeReadableStream(this);
if (underlyingSource.type === 'bytes') {
if (strategy.size !== undefined) {
throw new RangeError('The strategy for a byte stream cannot have a size function');
}
const highWaterMark = ExtractHighWaterMark(strategy, 0);
SetUpReadableByteStreamControllerFromUnderlyingSource(this, underlyingSource, highWaterMark);
}
else {
const sizeAlgorithm = ExtractSizeAlgorithm(strategy);
const highWaterMark = ExtractHighWaterMark(strategy, 1);
SetUpReadableStreamDefaultControllerFromUnderlyingSource(this, underlyingSource, highWaterMark, sizeAlgorithm);
}
}
/**
* Whether or not the readable stream is locked to a {@link ReadableStreamDefaultReader | reader}.
*/
get locked() {
if (!IsReadableStream(this)) {
throw streamBrandCheckException$1('locked');
}
return IsReadableStreamLocked(this);
}
/**
* Cancels the stream, signaling a loss of interest in the stream by a consumer.
*
* The supplied `reason` argument will be given to the underlying source's {@link UnderlyingSource.cancel | cancel()}
* method, which might or might not use it.
*/
cancel(reason = undefined) {
if (!IsReadableStream(this)) {
return promiseRejectedWith(streamBrandCheckException$1('cancel'));
}
if (IsReadableStreamLocked(this)) {
return promiseRejectedWith(new TypeError('Cannot cancel a stream that already has a reader'));
}
return ReadableStreamCancel(this, reason);
}
getReader(rawOptions = undefined) {
if (!IsReadableStream(this)) {
throw streamBrandCheckException$1('getReader');
}
const options = convertReaderOptions(rawOptions, 'First parameter');
if (options.mode === undefined) {
return AcquireReadableStreamDefaultReader(this);
}
return AcquireReadableStreamBYOBReader(this);
}
pipeThrough(rawTransform, rawOptions = {}) {
if (!IsReadableStream(this)) {
throw streamBrandCheckException$1('pipeThrough');
}
assertRequiredArgument(rawTransform, 1, 'pipeThrough');
const transform = convertReadableWritablePair(rawTransform, 'First parameter');
const options = convertPipeOptions(rawOptions, 'Second parameter');
if (IsReadableStreamLocked(this)) {
throw new TypeError('ReadableStream.prototype.pipeThrough cannot be used on a locked ReadableStream');
}
if (IsWritableStreamLocked(transform.writable)) {
throw new TypeError('ReadableStream.prototype.pipeThrough cannot be used on a locked WritableStream');
}
const promise = ReadableStreamPipeTo(this, transform.writable, options.preventClose, options.preventAbort, options.preventCancel, options.signal);
setPromiseIsHandledToTrue(promise);
return transform.readable;
}
pipeTo(destination, rawOptions = {}) {
if (!IsReadableStream(this)) {
return promiseRejectedWith(streamBrandCheckException$1('pipeTo'));
}
if (destination === undefined) {
return promiseRejectedWith(`Parameter 1 is required in 'pipeTo'.`);
}
if (!IsWritableStream(destination)) {
return promiseRejectedWith(new TypeError(`ReadableStream.prototype.pipeTo's first argument must be a WritableStream`));
}
let options;
try {
options = convertPipeOptions(rawOptions, 'Second parameter');
}
catch (e) {
return promiseRejectedWith(e);
}
if (IsReadableStreamLocked(this)) {
return promiseRejectedWith(new TypeError('ReadableStream.prototype.pipeTo cannot be used on a locked ReadableStream'));
}
if (IsWritableStreamLocked(destination)) {
return promiseRejectedWith(new TypeError('ReadableStream.prototype.pipeTo cannot be used on a locked WritableStream'));
}
return ReadableStreamPipeTo(this, destination, options.preventClose, options.preventAbort, options.preventCancel, options.signal);
}
/**
* Tees this readable stream, returning a two-element array containing the two resulting branches as
* new {@link ReadableStream} instances.
*
* Teeing a stream will lock it, preventing any other consumer from acquiring a reader.
* To cancel the stream, cancel both of the resulting branches; a composite cancellation reason will then be
* propagated to the stream's underlying source.
*
* Note that the chunks seen in each branch will be the same object. If the chunks are not immutable,
* this could allow interference between the two branches.
*/
tee() {
if (!IsReadableStream(this)) {
throw streamBrandCheckException$1('tee');
}
const branches = ReadableStreamTee(this);
return CreateArrayFromList(branches);
}
values(rawOptions = undefined) {
if (!IsReadableStream(this)) {
throw streamBrandCheckException$1('values');
}
const options = convertIteratorOptions(rawOptions, 'First parameter');
return AcquireReadableStreamAsyncIterator(this, options.preventCancel);
}
}
Object.defineProperties(ReadableStream.prototype, {
cancel: { enumerable: true },
getReader: { enumerable: true },
pipeThrough: { enumerable: true },
pipeTo: { enumerable: true },
tee: { enumerable: true },
values: { enumerable: true },
locked: { enumerable: true }
});
if (typeof SymbolPolyfill.toStringTag === 'symbol') {
Object.defineProperty(ReadableStream.prototype, SymbolPolyfill.toStringTag, {
value: 'ReadableStream',
configurable: true
});
}
if (typeof SymbolPolyfill.asyncIterator === 'symbol') {
Object.defineProperty(ReadableStream.prototype, SymbolPolyfill.asyncIterator, {
value: ReadableStream.prototype.values,
writable: true,
configurable: true
});
}
// Abstract operations for the ReadableStream.
// Throws if and only if startAlgorithm throws.
function CreateReadableStream(startAlgorithm, pullAlgorithm, cancelAlgorithm, highWaterMark = 1, sizeAlgorithm = () => 1) {
const stream = Object.create(ReadableStream.prototype);
InitializeReadableStream(stream);
const controller = Object.create(ReadableStreamDefaultController.prototype);
SetUpReadableStreamDefaultController(stream, controller, startAlgorithm, pullAlgorithm, cancelAlgorithm, highWaterMark, sizeAlgorithm);
return stream;
}
// Throws if and only if startAlgorithm throws.
function CreateReadableByteStream(startAlgorithm, pullAlgorithm, cancelAlgorithm) {
const stream = Object.create(ReadableStream.prototype);
InitializeReadableStream(stream);
const controller = Object.create(ReadableByteStreamController.prototype);
SetUpReadableByteStreamController(stream, controller, startAlgorithm, pullAlgorithm, cancelAlgorithm, 0, undefined);
return stream;
}
function InitializeReadableStream(stream) {
stream._state = 'readable';
stream._reader = undefined;
stream._storedError = undefined;
stream._disturbed = false;
}
function IsReadableStream(x) {
if (!typeIsObject(x)) {
return false;
}
if (!Object.prototype.hasOwnProperty.call(x, '_readableStreamController')) {
return false;
}
return x instanceof ReadableStream;
}
function IsReadableStreamLocked(stream) {
if (stream._reader === undefined) {
return false;
}
return true;
}
// ReadableStream API exposed for controllers.
function ReadableStreamCancel(stream, reason) {
stream._disturbed = true;
if (stream._state === 'closed') {
return promiseResolvedWith(undefined);
}
if (stream._state === 'errored') {
return promiseRejectedWith(stream._storedError);
}
ReadableStreamClose(stream);
const reader = stream._reader;
if (reader !== undefined && IsReadableStreamBYOBReader(reader)) {
reader._readIntoRequests.forEach(readIntoRequest => {
readIntoRequest._closeSteps(undefined);
});
reader._readIntoRequests = new SimpleQueue();
}
const sourceCancelPromise = stream._readableStreamController[CancelSteps](reason);
return transformPromiseWith(sourceCancelPromise, noop);
}
function ReadableStreamClose(stream) {
stream._state = 'closed';
const reader = stream._reader;
if (reader === undefined) {
return;
}
defaultReaderClosedPromiseResolve(reader);
if (IsReadableStreamDefaultReader(reader)) {
reader._readRequests.forEach(readRequest => {
readRequest._closeSteps();
});
reader._readRequests = new SimpleQueue();
}
}
function ReadableStreamError(stream, e) {
stream._state = 'errored';
stream._storedError = e;
const reader = stream._reader;
if (reader === undefined) {
return;
}
defaultReaderClosedPromiseReject(reader, e);
if (IsReadableStreamDefaultReader(reader)) {
reader._readRequests.forEach(readRequest => {
readRequest._errorSteps(e);
});
reader._readRequests = new SimpleQueue();
}
else {
reader._readIntoRequests.forEach(readIntoRequest => {
readIntoRequest._errorSteps(e);
});
reader._readIntoRequests = new SimpleQueue();
}
}
// Helper functions for the ReadableStream.
function streamBrandCheckException$1(name) {
return new TypeError(`ReadableStream.prototype.${name} can only be used on a ReadableStream`);
}
function convertQueuingStrategyInit(init, context) {
assertDictionary(init, context);
const highWaterMark = init === null || init === void 0 ? void 0 : init.highWaterMark;
assertRequiredField(highWaterMark, 'highWaterMark', 'QueuingStrategyInit');
return {
highWaterMark: convertUnrestrictedDouble(highWaterMark)
};
}
// The size function must not have a prototype property nor be a constructor
const byteLengthSizeFunction = (chunk) => {
return chunk.byteLength;
};
try {
Object.defineProperty(byteLengthSizeFunction, 'name', {
value: 'size',
configurable: true
});
}
catch (_a) {
// This property is non-configurable in older browsers, so ignore if this throws.
// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Function/name#browser_compatibility
}
/**
* A queuing strategy that counts the number of bytes in each chunk.
*
* @public
*/
class ByteLengthQueuingStrategy {
constructor(options) {
assertRequiredArgument(options, 1, 'ByteLengthQueuingStrategy');
options = convertQueuingStrategyInit(options, 'First parameter');
this._byteLengthQueuingStrategyHighWaterMark = options.highWaterMark;
}
/**
* Returns the high water mark provided to the constructor.
*/
get highWaterMark() {
if (!IsByteLengthQueuingStrategy(this)) {
throw byteLengthBrandCheckException('highWaterMark');
}
return this._byteLengthQueuingStrategyHighWaterMark;
}
/**
* Measures the size of `chunk` by returning the value of its `byteLength` property.
*/
get size() {
if (!IsByteLengthQueuingStrategy(this)) {
throw byteLengthBrandCheckException('size');
}
return byteLengthSizeFunction;
}
}
Object.defineProperties(ByteLengthQueuingStrategy.prototype, {
highWaterMark: { enumerable: true },
size: { enumerable: true }
});
if (typeof SymbolPolyfill.toStringTag === 'symbol') {
Object.defineProperty(ByteLengthQueuingStrategy.prototype, SymbolPolyfill.toStringTag, {
value: 'ByteLengthQueuingStrategy',
configurable: true
});
}
// Helper functions for the ByteLengthQueuingStrategy.
function byteLengthBrandCheckException(name) {
return new TypeError(`ByteLengthQueuingStrategy.prototype.${name} can only be used on a ByteLengthQueuingStrategy`);
}
function IsByteLengthQueuingStrategy(x) {
if (!typeIsObject(x)) {
return false;
}
if (!Object.prototype.hasOwnProperty.call(x, '_byteLengthQueuingStrategyHighWaterMark')) {
return false;
}
return x instanceof ByteLengthQueuingStrategy;
}
// The size function must not have a prototype property nor be a constructor
const countSizeFunction = () => {
return 1;
};
try {
Object.defineProperty(countSizeFunction, 'name', {
value: 'size',
configurable: true
});
}
catch (_a) {
// This property is non-configurable in older browsers, so ignore if this throws.
// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Function/name#browser_compatibility
}
/**
* A queuing strategy that counts the number of chunks.
*
* @public
*/
class CountQueuingStrategy {
constructor(options) {
assertRequiredArgument(options, 1, 'CountQueuingStrategy');
options = convertQueuingStrategyInit(options, 'First parameter');
this._countQueuingStrategyHighWaterMark = options.highWaterMark;
}
/**
* Returns the high water mark provided to the constructor.
*/
get highWaterMark() {
if (!IsCountQueuingStrategy(this)) {
throw countBrandCheckException('highWaterMark');
}
return this._countQueuingStrategyHighWaterMark;
}
/**
* Measures the size of `chunk` by always returning 1.
* This ensures that the total queue size is a count of the number of chunks in the queue.
*/
get size() {
if (!IsCountQueuingStrategy(this)) {
throw countBrandCheckException('size');
}
return countSizeFunction;
}
}
Object.defineProperties(CountQueuingStrategy.prototype, {
highWaterMark: { enumerable: true },
size: { enumerable: true }
});
if (typeof SymbolPolyfill.toStringTag === 'symbol') {
Object.defineProperty(CountQueuingStrategy.prototype, SymbolPolyfill.toStringTag, {
value: 'CountQueuingStrategy',
configurable: true
});
}
// Helper functions for the CountQueuingStrategy.
function countBrandCheckException(name) {
return new TypeError(`CountQueuingStrategy.prototype.${name} can only be used on a CountQueuingStrategy`);
}
function IsCountQueuingStrategy(x) {
if (!typeIsObject(x)) {
return false;
}
if (!Object.prototype.hasOwnProperty.call(x, '_countQueuingStrategyHighWaterMark')) {
return false;
}
return x instanceof CountQueuingStrategy;
}
function convertTransformer(original, context) {
assertDictionary(original, context);
const flush = original === null || original === void 0 ? void 0 : original.flush;
const readableType = original === null || original === void 0 ? void 0 : original.readableType;
const start = original === null || original === void 0 ? void 0 : original.start;
const transform = original === null || original === void 0 ? void 0 : original.transform;
const writableType = original === null || original === void 0 ? void 0 : original.writableType;
return {
flush: flush === undefined ?
undefined :
convertTransformerFlushCallback(flush, original, `${context} has member 'flush' that`),
readableType,
start: start === undefined ?
undefined :
convertTransformerStartCallback(start, original, `${context} has member 'start' that`),
transform: transform === undefined ?
undefined :
convertTransformerTransformCallback(transform, original, `${context} has member 'transform' that`),
writableType
};
}
function convertTransformerFlushCallback(fn, original, context) {
assertFunction(fn, context);
return (controller) => promiseCall(fn, original, [controller]);
}
function convertTransformerStartCallback(fn, original, context) {
assertFunction(fn, context);
return (controller) => reflectCall(fn, original, [controller]);
}
function convertTransformerTransformCallback(fn, original, context) {
assertFunction(fn, context);
return (chunk, controller) => promiseCall(fn, original, [chunk, controller]);
}
// Class TransformStream
/**
* A transform stream consists of a pair of streams: a {@link WritableStream | writable stream},
* known as its writable side, and a {@link ReadableStream | readable stream}, known as its readable side.
* In a manner specific to the transform stream in question, writes to the writable side result in new data being
* made available for reading from the readable side.
*
* @public
*/
class TransformStream {
constructor(rawTransformer = {}, rawWritableStrategy = {}, rawReadableStrategy = {}) {
if (rawTransformer === undefined) {
rawTransformer = null;
}
const writableStrategy = convertQueuingStrategy(rawWritableStrategy, 'Second parameter');
const readableStrategy = convertQueuingStrategy(rawReadableStrategy, 'Third parameter');
const transformer = convertTransformer(rawTransformer, 'First parameter');
if (transformer.readableType !== undefined) {
throw new RangeError('Invalid readableType specified');
}
if (transformer.writableType !== undefined) {
throw new RangeError('Invalid writableType specified');
}
const readableHighWaterMark = ExtractHighWaterMark(readableStrategy, 0);
const readableSizeAlgorithm = ExtractSizeAlgorithm(readableStrategy);
const writableHighWaterMark = ExtractHighWaterMark(writableStrategy, 1);
const writableSizeAlgorithm = ExtractSizeAlgorithm(writableStrategy);
let startPromise_resolve;
const startPromise = newPromise(resolve => {
startPromise_resolve = resolve;
});
InitializeTransformStream(this, startPromise, writableHighWaterMark, writableSizeAlgorithm, readableHighWaterMark, readableSizeAlgorithm);
SetUpTransformStreamDefaultControllerFromTransformer(this, transformer);
if (transformer.start !== undefined) {
startPromise_resolve(transformer.start(this._transformStreamController));
}
else {
startPromise_resolve(undefined);
}
}
/**
* The readable side of the transform stream.
*/
get readable() {
if (!IsTransformStream(this)) {
throw streamBrandCheckException('readable');
}
return this._readable;
}
/**
* The writable side of the transform stream.
*/
get writable() {
if (!IsTransformStream(this)) {
throw streamBrandCheckException('writable');
}
return this._writable;
}
}
Object.defineProperties(TransformStream.prototype, {
readable: { enumerable: true },
writable: { enumerable: true }
});
if (typeof SymbolPolyfill.toStringTag === 'symbol') {
Object.defineProperty(TransformStream.prototype, SymbolPolyfill.toStringTag, {
value: 'TransformStream',
configurable: true
});
}
function InitializeTransformStream(stream, startPromise, writableHighWaterMark, writableSizeAlgorithm, readableHighWaterMark, readableSizeAlgorithm) {
function startAlgorithm() {
return startPromise;
}
function writeAlgorithm(chunk) {
return TransformStreamDefaultSinkWriteAlgorithm(stream, chunk);
}
function abortAlgorithm(reason) {
return TransformStreamDefaultSinkAbortAlgorithm(stream, reason);
}
function closeAlgorithm() {
return TransformStreamDefaultSinkCloseAlgorithm(stream);
}
stream._writable = CreateWritableStream(startAlgorithm, writeAlgorithm, closeAlgorithm, abortAlgorithm, writableHighWaterMark, writableSizeAlgorithm);
function pullAlgorithm() {
return TransformStreamDefaultSourcePullAlgorithm(stream);
}
function cancelAlgorithm(reason) {
TransformStreamErrorWritableAndUnblockWrite(stream, reason);
return promiseResolvedWith(undefined);
}
stream._readable = CreateReadableStream(startAlgorithm, pullAlgorithm, cancelAlgorithm, readableHighWaterMark, readableSizeAlgorithm);
// The [[backpressure]] slot is set to undefined so that it can be initialised by TransformStreamSetBackpressure.
stream._backpressure = undefined;
stream._backpressureChangePromise = undefined;
stream._backpressureChangePromise_resolve = undefined;
TransformStreamSetBackpressure(stream, true);
stream._transformStreamController = undefined;
}
function IsTransformStream(x) {
if (!typeIsObject(x)) {
return false;
}
if (!Object.prototype.hasOwnProperty.call(x, '_transformStreamController')) {
return false;
}
return x instanceof TransformStream;
}
// This is a no-op if both sides are already errored.
function TransformStreamError(stream, e) {
ReadableStreamDefaultControllerError(stream._readable._readableStreamController, e);
TransformStreamErrorWritableAndUnblockWrite(stream, e);
}
function TransformStreamErrorWritableAndUnblockWrite(stream, e) {
TransformStreamDefaultControllerClearAlgorithms(stream._transformStreamController);
WritableStreamDefaultControllerErrorIfNeeded(stream._writable._writableStreamController, e);
if (stream._backpressure) {
// Pretend that pull() was called to permit any pending write() calls to complete. TransformStreamSetBackpressure()
// cannot be called from enqueue() or pull() once the ReadableStream is errored, so this will will be the final time
// _backpressure is set.
TransformStreamSetBackpressure(stream, false);
}
}
function TransformStreamSetBackpressure(stream, backpressure) {
// Passes also when called during construction.
if (stream._backpressureChangePromise !== undefined) {
stream._backpressureChangePromise_resolve();
}
stream._backpressureChangePromise = newPromise(resolve => {
stream._backpressureChangePromise_resolve = resolve;
});
stream._backpressure = backpressure;
}
// Class TransformStreamDefaultController
/**
* Allows control of the {@link ReadableStream} and {@link WritableStream} of the associated {@link TransformStream}.
*
* @public
*/
class TransformStreamDefaultController {
constructor() {
throw new TypeError('Illegal constructor');
}
/**
* Returns the desired size to fill the readable side’s internal queue. It can be negative, if the queue is over-full.
*/
get desiredSize() {
if (!IsTransformStreamDefaultController(this)) {
throw defaultControllerBrandCheckException('desiredSize');
}
const readableController = this._controlledTransformStream._readable._readableStreamController;
return ReadableStreamDefaultControllerGetDesiredSize(readableController);
}
enqueue(chunk = undefined) {
if (!IsTransformStreamDefaultController(this)) {
throw defaultControllerBrandCheckException('enqueue');
}
TransformStreamDefaultControllerEnqueue(this, chunk);
}
/**
* Errors both the readable side and the writable side of the controlled transform stream, making all future
* interactions with it fail with the given error `e`. Any chunks queued for transformation will be discarded.
*/
error(reason = undefined) {
if (!IsTransformStreamDefaultController(this)) {
throw defaultControllerBrandCheckException('error');
}
TransformStreamDefaultControllerError(this, reason);
}
/**
* Closes the readable side and errors the writable side of the controlled transform stream. This is useful when the
* transformer only needs to consume a portion of the chunks written to the writable side.
*/
terminate() {
if (!IsTransformStreamDefaultController(this)) {
throw defaultControllerBrandCheckException('terminate');
}
TransformStreamDefaultControllerTerminate(this);
}
}
Object.defineProperties(TransformStreamDefaultController.prototype, {
enqueue: { enumerable: true },
error: { enumerable: true },
terminate: { enumerable: true },
desiredSize: { enumerable: true }
});
if (typeof SymbolPolyfill.toStringTag === 'symbol') {
Object.defineProperty(TransformStreamDefaultController.prototype, SymbolPolyfill.toStringTag, {
value: 'TransformStreamDefaultController',
configurable: true
});
}
// Transform Stream Default Controller Abstract Operations
function IsTransformStreamDefaultController(x) {
if (!typeIsObject(x)) {
return false;
}
if (!Object.prototype.hasOwnProperty.call(x, '_controlledTransformStream')) {
return false;
}
return x instanceof TransformStreamDefaultController;
}
function SetUpTransformStreamDefaultController(stream, controller, transformAlgorithm, flushAlgorithm) {
controller._controlledTransformStream = stream;
stream._transformStreamController = controller;
controller._transformAlgorithm = transformAlgorithm;
controller._flushAlgorithm = flushAlgorithm;
}
function SetUpTransformStreamDefaultControllerFromTransformer(stream, transformer) {
const controller = Object.create(TransformStreamDefaultController.prototype);
let transformAlgorithm = (chunk) => {
try {
TransformStreamDefaultControllerEnqueue(controller, chunk);
return promiseResolvedWith(undefined);
}
catch (transformResultE) {
return promiseRejectedWith(transformResultE);
}
};
let flushAlgorithm = () => promiseResolvedWith(undefined);
if (transformer.transform !== undefined) {
transformAlgorithm = chunk => transformer.transform(chunk, controller);
}
if (transformer.flush !== undefined) {
flushAlgorithm = () => transformer.flush(controller);
}
SetUpTransformStreamDefaultController(stream, controller, transformAlgorithm, flushAlgorithm);
}
function TransformStreamDefaultControllerClearAlgorithms(controller) {
controller._transformAlgorithm = undefined;
controller._flushAlgorithm = undefined;
}
function TransformStreamDefaultControllerEnqueue(controller, chunk) {
const stream = controller._controlledTransformStream;
const readableController = stream._readable._readableStreamController;
if (!ReadableStreamDefaultControllerCanCloseOrEnqueue(readableController)) {
throw new TypeError('Readable side is not in a state that permits enqueue');
}
// We throttle transform invocations based on the backpressure of the ReadableStream, but we still
// accept TransformStreamDefaultControllerEnqueue() calls.
try {
ReadableStreamDefaultControllerEnqueue(readableController, chunk);
}
catch (e) {
// This happens when readableStrategy.size() throws.
TransformStreamErrorWritableAndUnblockWrite(stream, e);
throw stream._readable._storedError;
}
const backpressure = ReadableStreamDefaultControllerHasBackpressure(readableController);
if (backpressure !== stream._backpressure) {
TransformStreamSetBackpressure(stream, true);
}
}
function TransformStreamDefaultControllerError(controller, e) {
TransformStreamError(controller._controlledTransformStream, e);
}
function TransformStreamDefaultControllerPerformTransform(controller, chunk) {
const transformPromise = controller._transformAlgorithm(chunk);
return transformPromiseWith(transformPromise, undefined, r => {
TransformStreamError(controller._controlledTransformStream, r);
throw r;
});
}
function TransformStreamDefaultControllerTerminate(controller) {
const stream = controller._controlledTransformStream;
const readableController = stream._readable._readableStreamController;
ReadableStreamDefaultControllerClose(readableController);
const error = new TypeError('TransformStream terminated');
TransformStreamErrorWritableAndUnblockWrite(stream, error);
}
// TransformStreamDefaultSink Algorithms
function TransformStreamDefaultSinkWriteAlgorithm(stream, chunk) {
const controller = stream._transformStreamController;
if (stream._backpressure) {
const backpressureChangePromise = stream._backpressureChangePromise;
return transformPromiseWith(backpressureChangePromise, () => {
const writable = stream._writable;
const state = writable._state;
if (state === 'erroring') {
throw writable._storedError;
}
return TransformStreamDefaultControllerPerformTransform(controller, chunk);
});
}
return TransformStreamDefaultControllerPerformTransform(controller, chunk);
}
function TransformStreamDefaultSinkAbortAlgorithm(stream, reason) {
// abort() is not called synchronously, so it is possible for abort() to be called when the stream is already
// errored.
TransformStreamError(stream, reason);
return promiseResolvedWith(undefined);
}
function TransformStreamDefaultSinkCloseAlgorithm(stream) {
// stream._readable cannot change after construction, so caching it across a call to user code is safe.
const readable = stream._readable;
const controller = stream._transformStreamController;
const flushPromise = controller._flushAlgorithm();
TransformStreamDefaultControllerClearAlgorithms(controller);
// Return a promise that is fulfilled with undefined on success.
return transformPromiseWith(flushPromise, () => {
if (readable._state === 'errored') {
throw readable._storedError;
}
ReadableStreamDefaultControllerClose(readable._readableStreamController);
}, r => {
TransformStreamError(stream, r);
throw readable._storedError;
});
}
// TransformStreamDefaultSource Algorithms
function TransformStreamDefaultSourcePullAlgorithm(stream) {
// Invariant. Enforced by the promises returned by start() and pull().
TransformStreamSetBackpressure(stream, false);
// Prevent the next pull() call until there is backpressure.
return stream._backpressureChangePromise;
}
// Helper functions for the TransformStreamDefaultController.
function defaultControllerBrandCheckException(name) {
return new TypeError(`TransformStreamDefaultController.prototype.${name} can only be used on a TransformStreamDefaultController`);
}
// Helper functions for the TransformStream.
function streamBrandCheckException(name) {
return new TypeError(`TransformStream.prototype.${name} can only be used on a TransformStream`);
}
const exports$1 = {
ReadableStream,
ReadableStreamDefaultController,
ReadableByteStreamController,
ReadableStreamBYOBRequest,
ReadableStreamDefaultReader,
ReadableStreamBYOBReader,
WritableStream,
WritableStreamDefaultController,
WritableStreamDefaultWriter,
ByteLengthQueuingStrategy,
CountQueuingStrategy,
TransformStream,
TransformStreamDefaultController
};
// Add classes to global scope
if (typeof globals !== 'undefined') {
for (const prop in exports$1) {
if (Object.prototype.hasOwnProperty.call(exports$1, prop)) {
Object.defineProperty(globals, prop, {
value: exports$1[prop],
writable: true,
configurable: true
});
}
}
}
exports.ByteLengthQueuingStrategy = ByteLengthQueuingStrategy;
exports.CountQueuingStrategy = CountQueuingStrategy;
exports.ReadableByteStreamController = ReadableByteStreamController;
exports.ReadableStream = ReadableStream;
exports.ReadableStreamBYOBReader = ReadableStreamBYOBReader;
exports.ReadableStreamBYOBRequest = ReadableStreamBYOBRequest;
exports.ReadableStreamDefaultController = ReadableStreamDefaultController;
exports.ReadableStreamDefaultReader = ReadableStreamDefaultReader;
exports.TransformStream = TransformStream;
exports.TransformStreamDefaultController = TransformStreamDefaultController;
exports.WritableStream = WritableStream;
exports.WritableStreamDefaultController = WritableStreamDefaultController;
exports.WritableStreamDefaultWriter = WritableStreamDefaultWriter;
Object.defineProperty(exports, '__esModule', { value: true });
})));
//# sourceMappingURL=polyfill.es2018.js.map