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Version: 3.7.0


The desiredSize read-only property of the TransformStreamDefaultController interface returns the desired size to fill the queue of the associated ReadableStream.

The internal queue of a ReadableStream contains chunks that have been enqueued, but not yet read.

If the desiredSize is 0 then the queue is full. Therefore you can use this information to manually apply backpressure to manage the queue.


The desired size.