@kaynewang/simple-saver/dist/readable-stream.d.ts

This package can help you download multi-file easily.

import { ReadableStream as ReadableStreamPonyfill } from 'web-streams-polyfill/ponyfill';
declare const ModernReadableStream: {
  new <R = any>(underlyingSource?: UnderlyingSource<R>, strategy?: QueuingStrategy<R>): ReadableStream<R>;
  prototype: ReadableStream<any>;
} | typeof ReadableStreamPonyfill;
export { ModernReadableStream };