Object.defineProperty(ReadableStream.prototype, Symbol.asyncIterator, {
  configurable: true,
  writable: true,
  value: async function* <T>(
    this: ReadableStream<T>,
    { preventCancel = false }: { preventCancel?: boolean } = {},
  ) {
    const reader = this.getReader();
    let done = false;
    try {
      while (true) {
        const result = await reader.read();
        done = result.done;
        if (done) return;
        yield result.value;
      }
    } finally {
      try {
        if (!done && !preventCancel) await reader.cancel();
      } finally {
        reader.releaseLock();
      }
    }
  },
});