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-alpha.2): 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] };
        }
      }

      return false;
    }

    function transitionEndEmulator(duration) {
      var _this = this;

      var called = false;

      $(this).one(Util.TRANSITION_END, function () {
        called = true;
      });

      setTimeout(function () {
        if (!called) {
          Util.triggerTransitionEnd(_this);
        }
      }, duration);

      return this;
    }

    function setTransitionEndSupport() {
      transition = transitionEndTest();

      $.fn.emulateTransitionEnd = transitionEndEmulator;

      if (Util.supportsTransitionEnd()) {
        $.event.special[Util.TRANSITION_END] = getSpecialTransitionEndEvent();
      }
    }

    /**
     * --------------------------------------------------------------------------
     * Public Util Api
     * --------------------------------------------------------------------------
     */

    var Util = {

      TRANSITION_END: 'bsTransitionEnd',

      getUID: function getUID(prefix) {
        do {
          /* eslint-disable no-bitwise */
          prefix += ~ ~(Math.random() * 1000000); // "~~" acts like a faster Math.floor() here
          /* eslint-enable no-bitwise */
        } while (document.getElementById(prefix));
        return prefix;
      },

      getSelectorFromElement: function getSelectorFromElement(element) {
        var selector = element.getAttribute('data-target');

        if (!selector) {
          selector = element.getAttribute('href') || '';
          selector = /^#[a-z]/i.test(selector) ? selector : null;
        }

        return selector;
      },

      reflow: function reflow(element) {
        new Function('bs', 'return bs')(element.offsetHeight);
      },

      triggerTransitionEnd: function triggerTransitionEnd(element) {
        $(element).trigger(transition.end);
      },

      supportsTransitionEnd: function supportsTransitionEnd() {
        return Boolean(transition);
      },

      typeCheckConfig: function typeCheckConfig(componentName, config, configTypes) {
        for (var property in configTypes) {
          if (configTypes.hasOwnProperty(property)) {
            var expectedTypes = configTypes[property];
            var value = config[property];
            var valueType = undefined;

            if (value && isElement(value)) {
              valueType = 'element';
            } else {
              valueType = toType(value);
            }

            if (!new RegExp(expectedTypes).test(valueType)) {
              throw new Error(componentName.toUpperCase() + ': ' + ('Option "' + property + '" provided type "' + valueType + '" ') + ('but expected type "' + expectedTypes + '".'));
            }
          }
        }
      }
    };

    setTransitionEndSupport();

    return Util;
  })(jQuery);

  module.exports = Util;
});