The ReadableStreamBYOBReader() constructor creates and returns a ReadableStreamBYOBReader object instance.

stream

The ReadableStream to be read.

An instance of the ReadableStreamBYOBReader object.

TypeError

Thrown if the supplied stream parameter is not a ReadableStream, or it is already locked for reading by another reader, or its stream controller is not a ReadableByteStreamController.

The constructor is rarely called directly. Instead call ReadableStream.getReader() as shown:

const reader = stream.getReader({ mode: "byob" });

• ReadableStreamBYOBReader
• Using readable byte stream