use directories for structure

node_modules/bootstrap/js/dist/util.js

@@ -1,6 +1,6 @@
 /*!
-  * Bootstrap util.js v4.4.1 (https://getbootstrap.com/)
-  * Copyright 2011-2019 The Bootstrap Authors (https://github.com/twbs/bootstrap/graphs/contributors)
+  * Bootstrap util.js v4.5.0 (https://getbootstrap.com/)
+  * Copyright 2011-2020 The Bootstrap Authors (https://github.com/twbs/bootstrap/graphs/contributors)
   * Licensed under MIT (https://github.com/twbs/bootstrap/blob/master/LICENSE)
   */
 (function (global, factory) {
@@ -9,11 +9,11 @@
   (global = global || self, global.Util = factory(global.jQuery));
 }(this, (function ($) { 'use strict';
 
-  $ = $ && $.hasOwnProperty('default') ? $['default'] : $;
+  $ = $ && Object.prototype.hasOwnProperty.call($, 'default') ? $['default'] : $;
 
   /**
    * --------------------------------------------------------------------------
-   * Bootstrap (v4.4.1): util.js
+   * Bootstrap (v4.5.0): util.js
    * Licensed under MIT (https://github.com/twbs/bootstrap/blob/master/LICENSE)
    * --------------------------------------------------------------------------
    */
@@ -28,6 +28,10 @@
   var MILLISECONDS_MULTIPLIER = 1000; // Shoutout AngusCroll (https://goo.gl/pxwQGp)
 
   function toType(obj) {
+    if (obj === null || typeof obj === 'undefined') {
+      return "" + obj;
+    }
+
     return {}.toString.call(obj).match(/\s([a-z]+)/i)[1].toLowerCase();
   }
 
@@ -40,7 +44,7 @@
           return event.handleObj.handler.apply(this, arguments); // eslint-disable-line prefer-rest-params
         }
 
-        return undefined; // eslint-disable-line no-undefined
+        return undefined;
       }
     };
   }