ReadableByteStreamController

interface ReadableByteStreamController {

readonly byobRequest: ReadableStreamBYOBRequest | null;

readonly desiredSize: number | null;
close(): void;
enqueue(chunk: ArrayBufferView): void;
error(error?: any): void;
}

var ReadableByteStreamController: {
prototype: ReadableByteStreamController; 
new (): ReadableByteStreamController; 
};