util.js

(function (global, factory) {
  if (typeof define === 'function' && define.amd) {
    define(['exports', 'module'], factory);
  } else if (typeof exports !== 'undefined' && typeof module !== 'undefined') {
    factory(exports, module);
  } else {
    var mod = {
      exports: {}
    };
    factory(mod.exports, mod);
    global.util = mod.exports;
  }
})(this, function (exports, module) {
  /**
   * --------------------------------------------------------------------------
   * Bootstrap (v4.0.0): util.js
   * Licensed under MIT (https://github.com/twbs/bootstrap/blob/master/LICENSE)
   * --------------------------------------------------------------------------
   */

  'use strict';

  var Util = (function ($) {

    /**
     * ------------------------------------------------------------------------
     * Private TransitionEnd Helpers
     * ------------------------------------------------------------------------
     */

    var transition = false;

    var TransitionEndEvent = {
      WebkitTransition: 'webkitTransitionEnd',
      MozTransition: 'transitionend',
      OTransition: 'oTransitionEnd otransitionend',
      transition: 'transitionend'
    };

    // shoutout AngusCroll (https://goo.gl/pxwQGp)
    function toType(obj) {
      return ({}).toString.call(obj).match(/\s([a-zA-Z]+)/)[1].toLowerCase();
    }

    function isElement(obj) {
      return (obj[0] || obj).nodeType;
    }

    function getSpecialTransitionEndEvent() {
      return {
        bindType: transition.end,
        delegateType: transition.end,
        handle: function handle(event) {
          if ($(event.target).is(this)) {
            return event.handleObj.handler.apply(this, arguments);
          }
        }
      };
    }

    function transitionEndTest() {
      if (window.QUnit) {
        return false;
      }

      var el = document.createElement('bootstrap');

      for (var _name in TransitionEndEvent) {
        if (el.style[_name] !== undefined) {
          return { end: TransitionEndEvent[_name] };