Variable ReadableStream

ReadableStream: {
    prototype: ReadableStream<any>;
    from<T>(iterable: Iterable<T, any, any> | AsyncIterable<T, any, any>): ReadableStream<T>;
    new (underlyingSource: UnderlyingByteSource, strategy?: QueuingStrategy<Uint8Array>): ReadableStream<Uint8Array>;
    new <R>(underlyingSource?: UnderlyingSource<R>, strategy?: QueuingStrategy<R>): ReadableStream<R>;
}