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// Copyright 2018-2022 the Deno authors. All rights reserved. MIT license.
/** Reader utility for combining multiple readers */export class MultiReader implements Deno.Reader {  readonly #readers: Deno.Reader[];  #currentIndex = 0;
  constructor(readers: Deno.Reader[]) {    this.#readers = [...readers];  }
  async read(p: Uint8Array): Promise<number | null> {    const r = this.#readers[this.#currentIndex];    if (!r) return null;    const result = await r.read(p);    if (result === null) {      this.#currentIndex++;      return 0;    }    return result;  }}