code: function(file, content) {
          var sourceMapURLMatch = REGEX_SOURCEMAP.exec(content);
  
          if (sourceMapURLMatch) {
              var sourceMapURL = sourceMapURLMatch[1];
  
              if (sourceMapURL) {
                  var sourceMapContent = fs.readFileSync(path.resolve(path.dirname(file), sourceMapURL), 'utf-8');
  
                  var consumer = new sourceMap.SourceMapConsumer(sourceMapContent);
                  var node = sourceMap.SourceNode.fromStringWithSourceMap(content, consumer);
  
                  var result = node.toStringWithSourceMap();
  
                  content = result.code;
  
                  var map = result.map;
                  fs.writeFileSync(path.resolve(path.dirname(file), sourceMapURL), JSON.stringify(map));
              }
          }
  
          return content;
      }
docs: Updates the source and source map of the processed file.
  
  @method _updateSourceMap
  @protected
  @param {String} file The name of the processed file
  @param {String} content The content of the processed file
  @return {String} The modified content after updating the source map