deno.land / std@0.173.0 / streams / merge_readable_streams.ts
12345678910111213141516171819202122232425262728293031323334// Copyright 2018-2023 the Deno authors. All rights reserved. MIT license.
import { deferred } from "../async/deferred.ts";
/** * Merge multiple streams into a single one, not taking order into account. * If a stream ends before other ones, the other will continue adding data, * and the finished one will not add any more data. */export function mergeReadableStreams<T>( ...streams: ReadableStream<T>[]): ReadableStream<T> { const resolvePromises = streams.map(() => deferred<void>()); return new ReadableStream<T>({ start(controller) { Promise.all(resolvePromises).then(() => { controller.close(); }); try { for (const [key, stream] of Object.entries(streams)) { (async () => { for await (const data of stream) { controller.enqueue(data); } resolvePromises[+key].resolve(); })(); } } catch (e) { controller.error(e); } }, });}
Version Info