/**
  * Optimizes a stylesheet file
  *
  * @param  string  $file  The path to stylesheet file
  *
  * @return array  Optimization results
  */
 public function optimizeFile($file)
 {
     return parent::getDriver($this->driver)->reset()->processFile($file, false)->getResults();
 }
 /**
  * @see npOptimizerBase
  */
 public function getAssetFilepath($file)
 {
     return parent::computeAssetFilepath($file, 'js', '/js');
 }