TransformStream

interface TransformStream <I = any, O = any> {

readonly readable: ReadableStream<O>;

readonly writable: WritableStream<I>;
}

var TransformStream: {
prototype: TransformStream; 
new <I = any, O = any>(

transformer?: Transformer<I, O>,

writableStrategy?: QueuingStrategy<I>,

readableStrategy?: QueuingStrategy<O>,
): TransformStream<I, O>; 
};