code: public function compile(): string
      {
          if ($this->doWeNeedToMinify($this->file))
          {
              $src = $this->getMinifier($this->file, $this->source)->minify();
  
              // Remove any source mappings, they cause 404 errors.
              // One of the benefits of using this Robo Task is that it is super
              // easy to switch between a minifed asset and a non minified asset.
              $src = preg_replace('/^\/\/# sourceMappingURL.*$/m', '', $src);
  
              // TODO: generate our own source maps... sounds like a challenge :)
          }
          else
          {
              $src = $this->source;
          }
  
          return $src."\n\n";
      }
docs: @inheritDoc
  
  This implementation caters for both standard native Css and Js files
  that don't need any compiling as such. The less and sass compilers
  extend the css compiler.