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// Copyright 2018-2023 the Deno authors. All rights reserved. MIT license.
/** * Merge multiple streams into a single one, taking order into account, and each stream * will wait for a chunk to enqueue before the next stream can append another chunk. * If a stream ends before other ones, the others will continue adding data in order, * and the finished one will not add any more data. */export function zipReadableStreams<T>( ...streams: ReadableStream<T>[]): ReadableStream<T> { const readers = streams.map((s) => s.getReader()); return new ReadableStream<T>({ async start(controller) { try { let resolved = 0; while (resolved != streams.length) { for (const [key, reader] of Object.entries(readers)) { const { value, done } = await reader.read(); if (!done) { controller.enqueue(value!); } else { resolved++; readers.splice(+key, 1); } } } controller.close(); } catch (e) { controller.error(e); } }, });}