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SharedArrayBuffer : ArrayBuffer;\n\nexport class AsyncIterableReadableStream<T> extends AsyncIterableX<T> {\n constructor(protected _stream: ReadableStream<T>) {\n super();\n }\n [Symbol.asyncIterator]() {\n const stream = this._stream;\n const reader = stream['getReader']();\n return _consumeReader(stream, reader, defaultReaderToAsyncIterator(reader));\n }\n}\n\nexport class AsyncIterableReadableByteStream extends AsyncIterableReadableStream<Uint8Array> {\n [Symbol.asyncIterator]() {\n let stream = this._stream;\n let reader: ReadableStreamBYOBReader;\n try {\n reader = stream['getReader']({ mode: 'byob' });\n } catch (e) {\n return super[Symbol.asyncIterator]() as AsyncIterableIterator<Uint8Array>;\n }\n const iterator = _consumeReader(stream, reader, byobReaderToAsyncIterator(reader));\n // \"pump\" the iterator once so it initializes and is ready to accept a buffer or bytesToRead\n iterator.next();\n return iterator;\n }\n}\n\nasync function* _consumeReader<T>(\n stream: ReadableStream<T>,\n reader: ReadableStreamBYOBReader | ReadableStreamDefaultReader,\n iterator: AsyncIterableIterator<T>\n) {\n let threw = false;\n try {\n yield* iterator;\n } catch (e) {\n if ((threw = true) && reader) {\n await reader['cancel'](e);\n }\n } finally {\n if (!reader) {\n return;\n }\n if (!threw) {\n await reader['cancel']();\n }\n if (stream.locked) {\n try {\n reader.closed.catch(() => {\n /* */\n });\n reader.releaseLock();\n } catch (e) {\n /* */\n }\n }\n }\n}\n\n/** @ignore */\nasync function* defaultReaderToAsyncIterator<T = any>(reader: ReadableStreamDefaultReader<T>) {\n let r: ReadableStreamReadResult<T>;\n while (!(r = await reader.read()).done) {\n yield r.value;\n }\n}\n\n/** @ignore */\nasync function* byobReaderToAsyncIterator(reader: ReadableStreamBYOBReader) {\n let r: IteratorResult<Uint8Array>;\n let value: number | ArrayBufferLike = yield null!;\n while (!(r = await readNext(reader, value, 0)).done) {\n value = yield r.value;\n }\n}\n\n/** @ignore */\nasync function readNext(\n reader: ReadableStreamBYOBReader,\n bufferOrLen: ArrayBufferLike | number,\n offset: number\n): Promise<ReadableStreamReadResult<Uint8Array>> {\n let size: number;\n let buffer: ArrayBufferLike;\n\n if (typeof bufferOrLen === 'number') {\n buffer = new ArrayBuffer((size = bufferOrLen));\n } else if (bufferOrLen instanceof ArrayBuffer) {\n size = (buffer = bufferOrLen).byteLength;\n } else if (bufferOrLen instanceof SharedArrayBuf) {\n size = (buffer = bufferOrLen).byteLength;\n } else {\n return { done: true, value: undefined! };\n }\n\n return await readInto(reader, buffer, offset, size);\n}\n\n/** @ignore */\nasync function readInto(\n reader: ReadableStreamBYOBReader,\n buffer: ArrayBufferLike,\n offset: number,\n size: number\n): Promise<ReadableStreamReadResult<Uint8Array>> {\n if (offset >= size) {\n return { done: false, value: new Uint8Array(buffer, 0, size) };\n }\n const { done, value } = await reader.read(new Uint8Array(buffer, offset, size - offset));\n if ((offset += value.byteLength) < size && !done) {\n return await readInto(reader, value.buffer, offset, size);\n }\n return { done, value: new Uint8Array(value.buffer, 0, offset) };\n}\n\nexport function fromDOMStream<TSource>(stream: ReadableStream<TSource>): AsyncIterableX<TSource>;\nexport function fromDOMStream<TSource extends ArrayBufferView>(\n stream: ReadableStream<TSource>,\n options: { mode: 'byob' }\n): AsyncIterableX<TSource>;\n\nexport function fromDOMStream(stream: ReadableStream, options?: { mode: 'byob' }) {\n return !options || options.mode !== 'byob'\n ? new AsyncIterableReadableStream(stream)\n : new AsyncIterableReadableByteStream(stream);\n}\n"]} |