ReadableByteStreamController: enqueue() method

chunk

The chunk to enqueue.

None (undefined).

TypeError

Thrown if the source object is not a ReadableByteStreamController, or the stream cannot be read for some other reason, or the chunk is not an object, or the chunk's internal array buffer is non-existent, zero-length, or detached. It is also thrown if the stream has been closed.

The example in Using readable byte streams > Creating a readable socket push byte stream shows how you can use enqueue() to copy data to the stream if there is no outstanding byobRequest. If there is a byobRequest then it should be used!

The code below shows data being read into an ArrayBuffer using a "hypothetical" socket.readInto() method and then enqueued (but only if data was actually copied):

const buffer = new ArrayBuffer(DEFAULT_CHUNK_SIZE);
bytesRead = socket.readInto(buffer, 0, DEFAULT_CHUNK_SIZE);
if (bytesRead === 0) {
  controller.close();
} else {
  controller.enqueue(new Uint8Array(buffer, 0, bytesRead));
}

• Using readable byte streams
• ReadableByteStreamController