docs: function (pngFile, outputFile) {
          // jscs: disable
          var command = format('%s/pngcrush/pngcrush -nofilecheck -bail -blacken -reduce -rem alla -force %s "%s" "%s" 2>&1',
                  pwd,
                  pngFile.isSmall() ? '-brute' : '',
                  pngFile.name,
                  outputFile.name
              );
  
          return _compress(command, outputFile);
      }