ReadonlydesiredThe desiredSize read-only property of the ReadableStreamDefaultController interface returns the desired size required to fill the stream's internal queue.
The close() method of the ReadableStreamDefaultController interface closes the associated stream.
The enqueue() method of the ReadableStreamDefaultController interface enqueues a given chunk in the associated stream.
The error() method of the ReadableStreamDefaultController interface causes any future interactions with the associated stream to error.
Optionale: any
The
ReadableStreamDefaultControllerinterface of the Streams API represents a controller allowing control of a ReadableStream's state and internal queue. Default controllers are for streams that are not byte streams.MDN Reference