code: function (output, chunk) {
                  var me = this, stream = me._stream;
                  stream.pause();
                  output.write(chunk).then(function () {
                      stream.resume();
                  }, me._reject);
              }
docs: endregion 
  Stream 'data' event handler
  
  @param {gpf.interfaces.IWritableStream} output Output stream
  @param {Object} chunk Buffer
  @since 0.1.9