function insertWrapDetails(source, details) {
      var length = details.length;
      if (!length) {
        return source;
      }
      var lastIndex = length - 1;
      details[lastIndex] = (length > 1 ? '& ' : '') + details[lastIndex];
      details = details.join(length > 2 ? ', ' : ' ');
      return source.replace(reWrapComment, '{\n/* [wrapped with ' + details + '] */\n');
    }
Inserts wrapper `details` in a comment at the top of the `source` body.

@private
@param {string} source The source to modify.
@returns {Array} details The details to insert.
@returns {string} Returns the modified source.