code: function joinParts(entrances) {
  
          var parts = [];
          parts.push(Buffer(content.substring(0, matches.index)));
          parts.push(Buffer('styles: [`'));
  
          for (var i=0; i<entrances.length; i++) {
              parts.push(Buffer(entrances[i].replace(/\n/g, '')));
              if (i < entrances.length - 1) {
                  parts.push(Buffer('`, `'));
              }
          }
          parts.push(Buffer('`]'));
          parts.push(Buffer(content.substr(matches.index + matches[0].length)));
          return Buffer.concat(parts);
      }
docs: Writes the new css strings to the file buffer