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Filename : polyfill.es2018.js
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/**
 * 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';

    /// <reference lib="es2015.symbol" />
    const SymbolPolyfill = typeof Symbol === 'function' && typeof Symbol.iterator === 'symbol' ?
        Symbol :
        description => `Symbol(${description})`;

    /// <reference lib="dom" />
    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();

    const assert = noop;

    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;
            assert(oldBack._next === undefined);
            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() {
            assert(this._size > 0); // 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) {
                assert(elements.length === QUEUE_MAX_ARRAY_SIZE);
                assert(oldFront._next !== undefined);
                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) {
                    assert(node._next !== undefined);
                    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() {
            assert(this._size > 0); // 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 {
            assert(stream._state === 'errored');
            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) {
        assert(reader._ownerReadableStream !== undefined);
        assert(reader._ownerReadableStream._reader === 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) {
        assert(reader._closedPromise_resolve === undefined);
        assert(reader._closedPromise_reject === undefined);
        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]]');

    /// <reference lib="es2015.core" />
    // 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);
    };

    /// <reference lib="es2015.core" />
    // 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) {
        assert(IsReadableStreamDefaultReader(stream._reader));
        assert(stream._state === 'readable');
        stream._reader._readRequests.push(readRequest);
    }
    function ReadableStreamFulfillReadRequest(stream, chunk, done) {
        const reader = stream._reader;
        assert(reader._readRequests.length > 0);
        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 {
            assert(stream._state === 'readable');
            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`);
    }

    /// <reference lib="es2018.asynciterable" />
    /* eslint-disable @typescript-eslint/no-empty-function */
    const AsyncIteratorPrototype = Object.getPrototypeOf(Object.getPrototypeOf(async function* () { }).prototype);

    /// <reference lib="es2018.asynciterable" />
    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'));
            }
            assert(reader._readRequests.length === 0);
            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`);
    }

    /// <reference lib="es2015.core" />
    // 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 CanTransferArrayBuffer(O) {
        return true;
    }
    // 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) {
        assert(container._queue.length > 0);
        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) {
        assert(container._queue.length > 0);
        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)) ;
            assert(this._view.byteLength > 0);
            assert(this._view.buffer.byteLength > 0);
            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;
            assert(ReadableStreamHasDefaultReader(stream));
            if (this._queueTotalSize > 0) {
                assert(ReadableStreamGetNumReadRequests(stream) === 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;
        }
        assert(!controller._pullAgain);
        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) {
        assert(stream._state !== 'errored');
        let done = false;
        if (stream._state === 'closed') {
            assert(pullIntoDescriptor.bytesFilled === 0);
            done = true;
        }
        const filledView = ReadableByteStreamControllerConvertPullIntoDescriptor(pullIntoDescriptor);
        if (pullIntoDescriptor.readerType === 'default') {
            ReadableStreamFulfillReadRequest(stream, filledView, done);
        }
        else {
            assert(pullIntoDescriptor.readerType === 'byob');
            ReadableStreamFulfillReadIntoRequest(stream, filledView, done);
        }
    }
    function ReadableByteStreamControllerConvertPullIntoDescriptor(pullIntoDescriptor) {
        const bytesFilled = pullIntoDescriptor.bytesFilled;
        const elementSize = pullIntoDescriptor.elementSize;
        assert(bytesFilled <= pullIntoDescriptor.byteLength);
        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;
        }
        if (!ready) {
            assert(controller._queueTotalSize === 0);
            assert(pullIntoDescriptor.bytesFilled > 0);
            assert(pullIntoDescriptor.bytesFilled < pullIntoDescriptor.elementSize);
        }
        return ready;
    }
    function ReadableByteStreamControllerFillHeadPullIntoDescriptor(controller, size, pullIntoDescriptor) {
        assert(controller._pendingPullIntos.length === 0 || controller._pendingPullIntos.peek() === pullIntoDescriptor);
        assert(controller._byobRequest === null);
        pullIntoDescriptor.bytesFilled += size;
    }
    function ReadableByteStreamControllerHandleQueueDrain(controller) {
        assert(controller._controlledReadableByteStream._state === 'readable');
        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) {
        assert(!controller._closeRequested);
        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) {
        assert(firstDescriptor.bytesFilled === 0);
        const stream = controller._controlledReadableByteStream;
        if (ReadableStreamHasBYOBReader(stream)) {
            while (ReadableStreamGetNumReadIntoRequests(stream) > 0) {
                const pullIntoDescriptor = ReadableByteStreamControllerShiftPendingPullInto(controller);
                ReadableByteStreamControllerCommitPullIntoDescriptor(stream, pullIntoDescriptor);
            }
        }
    }
    function ReadableByteStreamControllerRespondInReadableState(controller, bytesWritten, pullIntoDescriptor) {
        assert(pullIntoDescriptor.bytesFilled + bytesWritten <= pullIntoDescriptor.byteLength);
        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();
        assert(CanTransferArrayBuffer(firstDescriptor.buffer));
        ReadableByteStreamControllerInvalidateBYOBRequest(controller);
        const state = controller._controlledReadableByteStream._state;
        if (state === 'closed') {
            ReadableByteStreamControllerRespondInClosedState(controller, firstDescriptor);
        }
        else {
            ReadableByteStreamControllerRespondInReadableState(controller, bytesWritten, firstDescriptor);
        }
        ReadableByteStreamControllerCallPullIfNeeded(controller);
    }
    function ReadableByteStreamControllerShiftPendingPullInto(controller) {
        assert(controller._byobRequest === null);
        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) {
                assert(controller._pendingPullIntos.length === 0);
                ReadableByteStreamControllerEnqueueChunkToQueue(controller, transferredBuffer, byteOffset, byteLength);
            }
            else {
                assert(controller._queue.length === 0);
                if (controller._pendingPullIntos.length > 0) {
                    assert(controller._pendingPullIntos.peek().readerType === 'default');
                    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 {
            assert(!IsReadableStreamLocked(stream));
            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) {
        assert(controller._pendingPullIntos.length > 0);
        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) {
        assert(controller._pendingPullIntos.length > 0);
        assert(!IsDetachedBuffer(view.buffer));
        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) {
        assert(stream._readableStreamController === undefined);
        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;
            assert(!controller._pulling);
            assert(!controller._pullAgain);
            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) {
        assert(IsReadableByteStreamController(controller));
        assert(!IsDetachedBuffer(view.buffer));
        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) {
        assert(IsReadableStreamBYOBReader(stream._reader));
        assert(stream._state === 'readable' || stream._state === 'closed');
        stream._reader._readIntoRequests.push(readIntoRequest);
    }
    function ReadableStreamFulfillReadIntoRequest(stream, chunk, done) {
        const reader = stream._reader;
        assert(reader._readIntoRequests.length > 0);
        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) {
        assert(IsWritableStream(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`));
        }
        assert(!WritableStreamCloseQueuedOrInFlight(stream));
        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) {
        assert(IsWritableStreamLocked(stream));
        assert(stream._state === 'writable');
        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) {
        assert(stream._storedError === undefined);
        assert(stream._state === 'writable');
        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) {
        assert(stream._state === 'erroring');
        assert(!WritableStreamHasOperationMarkedInFlight(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) {
        assert(stream._inFlightWriteRequest !== undefined);
        stream._inFlightWriteRequest._resolve(undefined);
        stream._inFlightWriteRequest = undefined;
    }
    function WritableStreamFinishInFlightWriteWithError(stream, error) {
        assert(stream._inFlightWriteRequest !== undefined);
        stream._inFlightWriteRequest._reject(error);
        stream._inFlightWriteRequest = undefined;
        assert(stream._state === 'writable' || stream._state === 'erroring');
        WritableStreamDealWithRejection(stream, error);
    }
    function WritableStreamFinishInFlightClose(stream) {
        assert(stream._inFlightCloseRequest !== undefined);
        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);
        }
        assert(stream._pendingAbortRequest === undefined);
        assert(stream._storedError === undefined);
    }
    function WritableStreamFinishInFlightCloseWithError(stream, error) {
        assert(stream._inFlightCloseRequest !== undefined);
        stream._inFlightCloseRequest._reject(error);
        stream._inFlightCloseRequest = undefined;
        assert(stream._state === 'writable' || stream._state === 'erroring');
        // 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) {
        assert(stream._inFlightCloseRequest === undefined);
        assert(stream._closeRequest !== undefined);
        stream._inFlightCloseRequest = stream._closeRequest;
        stream._closeRequest = undefined;
    }
    function WritableStreamMarkFirstWriteRequestInFlight(stream) {
        assert(stream._inFlightWriteRequest === undefined);
        assert(stream._writeRequests.length !== 0);
        stream._inFlightWriteRequest = stream._writeRequests.shift();
    }
    function WritableStreamRejectCloseAndClosedPromiseIfNeeded(stream) {
        assert(stream._state === 'errored');
        if (stream._closeRequest !== undefined) {
            assert(stream._inFlightCloseRequest === undefined);
            stream._closeRequest._reject(stream._storedError);
            stream._closeRequest = undefined;
        }
        const writer = stream._writer;
        if (writer !== undefined) {
            defaultWriterClosedPromiseReject(writer, stream._storedError);
        }
    }
    function WritableStreamUpdateBackpressure(stream, backpressure) {
        assert(stream._state === 'writable');
        assert(!WritableStreamCloseQueuedOrInFlight(stream));
        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;
            }
            assert(stream._writer !== undefined);
            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;
        assert(stream._writer === writer);
        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) {
        assert(IsWritableStream(stream));
        assert(stream._writableStreamController === undefined);
        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, () => {
            assert(stream._state === 'writable' || stream._state === 'erroring');
            controller._started = true;
            WritableStreamDefaultControllerAdvanceQueueIfNeeded(controller);
        }, r => {
            assert(stream._state === 'writable' || stream._state === 'erroring');
            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);
        assert(controller._queue.length === 0);
        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;
        assert(stream._state === 'writable');
        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;
        }
        assert(writer._closedPromiseState === 'pending');
        setPromiseIsHandledToTrue(writer._closedPromise);
        writer._closedPromise_reject(reason);
        writer._closedPromise_resolve = undefined;
        writer._closedPromise_reject = undefined;
        writer._closedPromiseState = 'rejected';
    }
    function defaultWriterClosedPromiseResetToRejected(writer, reason) {
        assert(writer._closedPromise_resolve === undefined);
        assert(writer._closedPromise_reject === undefined);
        assert(writer._closedPromiseState !== 'pending');
        defaultWriterClosedPromiseInitializeAsRejected(writer, reason);
    }
    function defaultWriterClosedPromiseResolve(writer) {
        if (writer._closedPromise_resolve === undefined) {
            return;
        }
        assert(writer._closedPromiseState === 'pending');
        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) {
        assert(writer._readyPromise_resolve === undefined);
        assert(writer._readyPromise_reject === undefined);
        defaultWriterReadyPromiseInitialize(writer);
    }
    function defaultWriterReadyPromiseResetToRejected(writer, reason) {
        assert(writer._readyPromise_resolve === undefined);
        assert(writer._readyPromise_reject === undefined);
        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';
    }

    /// <reference lib="dom" />
    const NativeDOMException = typeof DOMException !== 'undefined' ? DOMException : undefined;

    /// <reference types="node" />
    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) {
        assert(IsReadableStream(source));
        assert(IsWritableStream(dest));
        assert(signal === undefined || isAbortSignal(signal));
        assert(!IsReadableStreamLocked(source));
        assert(!IsWritableStreamLocked(dest));
        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;
        }
        assert(!controller._pullAgain);
        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) {
        assert(stream._readableStreamController === undefined);
        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;
            assert(!controller._pulling);
            assert(!controller._pullAgain);
            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) {
        assert(IsReadableStream(stream));
        if (IsReadableByteStreamController(stream._readableStreamController)) {
            return ReadableByteStreamTee(stream);
        }
        return ReadableStreamDefaultTee(stream);
    }
    function ReadableStreamDefaultTee(stream, cloneForBranch2) {
        assert(IsReadableStream(stream));
        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) {
        assert(IsReadableStream(stream));
        assert(IsReadableByteStreamController(stream._readableStreamController));
        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)) {
                assert(reader._readIntoRequests.length === 0);
                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)) {
                assert(reader._readRequests.length === 0);
                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) {
                        assert(chunk.byteLength === 0);
                        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 {
                assert(underlyingSource.type === undefined);
                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) {
        assert(IsReadableStream(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) {
        assert(stream._state === 'readable');
        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) {
        assert(IsReadableStream(stream));
        assert(stream._state === 'readable');
        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 {
            assert(IsReadableStreamBYOBReader(reader));
            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.
        assert(stream._backpressure !== backpressure);
        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) {
        assert(IsTransformStream(stream));
        assert(stream._transformStreamController === undefined);
        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) {
        assert(stream._writable._state === 'writable');
        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().
        assert(stream._backpressure);
        assert(stream._backpressureChangePromise !== undefined);
        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;

}));
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