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// Copyright 2018-2022 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);      }    },  });}