React\Stream\Stream::pipe PHP Метод

    public function pipe(WritableStreamInterface $dest, array $options = array())
    {
        Util::pipe($this, $dest, $options);
        return $dest;
    }

 public static function postInstall()
 {
     Config::makeBinDirectory();
     $loop = Factory::create();
     $file = Config::getBinFile();
     $url = 'https://yt-dl.org/downloads/latest/youtube-dl';
     $readStream = fopen($url, 'r');
     $writeStream = fopen($file, 'w');
     stream_set_blocking($readStream, 0);
     stream_set_blocking($writeStream, 0);
     $read = new Stream($readStream, $loop);
     $write = new Stream($writeStream, $loop);
     $read->on('end', function () use($file) {
         chmod($file, 0777);
         echo "Finished downloading {$file}\n";
     });
     $read->pipe($write);
     $loop->run();
 }