minify/min/groupsConfig.php

<?php
/**
 * Groups configuration for default Minify implementation
 * @package Minify
 */

return array(
    // 'js' => array('//js/file1.js', '//js/file2.js'),
    // 'css' => array('//css/file1.css', '//css/file2.css'),
    'js' => array('//js/Class.js', '//js/email.js')
);