Variable ReadableStream

    ReadableStream: {
        prototype: ReadableStream;
        new (
            underlyingSource: UnderlyingByteSource,
            strategy?: { highWaterMark?: number },
        ): ReadableStream<Uint8Array>;
        new <R = any>(
            underlyingSource: UnderlyingDefaultSource<R>,
            strategy?: QueuingStrategy<R>,
        ): ReadableStream<R>;
        new <R = any>(
            underlyingSource?: UnderlyingSource<R>,
            strategy?: QueuingStrategy<R>,
        ): ReadableStream<R>;
    }

    Type declaration