1 files changed, 14 insertions, 12 deletions

diff --git a/js/src/util.js b/js/src/util.js
index 3c0d02251..a75660014 100644
--- a/js/src/util.js
+++ b/js/src/util.js
@@ -1,11 +1,13 @@
+import $ from 'jquery'
+
 /**
  * --------------------------------------------------------------------------
- * Bootstrap (v4.0.0-alpha.6): util.js
+ * Bootstrap (v4.0.0-beta): util.js
  * Licensed under MIT (https://github.com/twbs/bootstrap/blob/master/LICENSE)
  * --------------------------------------------------------------------------
  */
 
-const Util = (($) => {
+const Util = (() => {
 
 
   /**
@@ -30,10 +32,6 @@ const Util = (($) => {
     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,
@@ -42,7 +40,7 @@ const Util = (($) => {
         if ($(event.target).is(this)) {
           return event.handleObj.handler.apply(this, arguments) // eslint-disable-line prefer-rest-params
         }
-        return undefined
+        return undefined // eslint-disable-line no-undefined
       }
     }
   }
@@ -55,7 +53,7 @@ const Util = (($) => {
     const el = document.createElement('bootstrap')
 
     for (const name in TransitionEndEvent) {
-      if (el.style[name] !== undefined) {
+      if (typeof el.style[name] !== 'undefined') {
         return {
           end: TransitionEndEvent[name]
         }
@@ -117,7 +115,7 @@ const Util = (($) => {
       }
 
       try {
-        const $selector = $(selector)
+        const $selector = $(document).find(selector)
         return $selector.length > 0 ? selector : null
       } catch (error) {
         return null
@@ -136,12 +134,16 @@ const Util = (($) => {
       return Boolean(transition)
     },
 
+    isElement(obj) {
+      return (obj[0] || obj).nodeType
+    },
+
     typeCheckConfig(componentName, config, configTypes) {
       for (const property in configTypes) {
-        if (configTypes.hasOwnProperty(property)) {
+        if (Object.prototype.hasOwnProperty.call(configTypes, property)) {
           const expectedTypes = configTypes[property]
           const value         = config[property]
-          const valueType     = value && isElement(value) ?
+          const valueType     = value && Util.isElement(value) ?
                                 'element' : toType(value)
 
           if (!new RegExp(expectedTypes).test(valueType)) {
@@ -159,6 +161,6 @@ const Util = (($) => {
 
   return Util
 
-})(jQuery)
+})($)
 
 export default Util