code: function replaceAttributes(file, attributes) {
          return (attributes || []).reduce((html, attrObj) =>
              html.replace(options.variablePrefix + attrObj.key, attrObj.value), file && file.toString() || '');
      }
docs: Replaces partial content with given attributes
  
  @param {Object|undefined} file - through2's file object
  @param {Array.<Object>} attributes - tag
  @returns {String}