Method [kTransfer]

lib/internal/webstreams/writablestream.js:296–323

()

  }

  [kTransfer]() {
    if (!isWritableStream(this))
      throw new ERR_INVALID_THIS('WritableStream');
    if (this.locked) {
      this[kState].transfer.port1?.close();
      this[kState].transfer.port1 = undefined;
      this[kState].transfer.port2 = undefined;
      throw new DOMException(
        'Cannot transfer a locked WritableStream',
        'DataCloneError');
    }

    const {
      readable,
      promise,
    } = lazyTransfer().newCrossRealmReadableStream(
      this,
      this[kState].transfer.port1);

    this[kState].transfer.readable = readable;
    this[kState].transfer.promise = promise;

    return {
      data: { port: this[kState].transfer.port2 },
      deserializeInfo:
        'internal/webstreams/writablestream:TransferredWritableStream',
    };
  }

  [kTransferList]() {
    const { port1, port2 } = new MessageChannel();