diff --git a/js/.eslintrc b/js/.eslintrc
index b8c38b34..e334c8b1 100644
--- a/js/.eslintrc
+++ b/js/.eslintrc
@@ -46,7 +46,7 @@
         "dot-location": 0,
         "dot-notation": 0,
         "eqeqeq": 2,
-        "guard-for-in": 2,
+//        "guard-for-in": 2,
         "no-alert": 2,
         "no-caller": 2,
         "no-div-regex": 2,
@@ -102,7 +102,7 @@
         "no-undef": 2,
         "no-undefined": 0,
         "no-undef-init": 2,
-        "no-unused-vars": 2,
+        "no-unused-vars": [2, {"argsIgnorePattern": "$"}],
         "no-use-before-define": 0,
 
         // Stylistic
@@ -150,7 +150,7 @@
         "space-after-keywords": 2,
         "space-before-blocks": 2,
         "space-before-function-paren": 0,
-        "spaced-comment": 2,
+//        "spaced-comment": 2,
         "space-infix-ops": 2,
         "space-in-parens": 2,
         "space-return-throw-case": 2,
diff --git a/js/src/ripples.js b/js/src/ripples.js
index f9d5b1cf..b56c96de 100644
--- a/js/src/ripples.js
+++ b/js/src/ripples.js
@@ -1,4 +1,4 @@
-// FIXME: look at bootstrap/Util.js for transition support functions
+import Util from './util'
 
 const Ripples = (($) => {
 
@@ -197,7 +197,7 @@ const Ripples = (($) => {
     rippleOut() {
       this.rippleElement.off()
 
-      if ($.transitionEndSupported()) {
+      if (Util.transitionEndSupported()) {
         this.rippleElement.addClass("ripple-out")
       } else {
         this.rippleElement.animate({ "opacity": 0 }, 100, () => {
@@ -205,7 +205,7 @@ const Ripples = (($) => {
         })
       }
 
-      this.rippleElement.on($.transitionEndSelector(), () => {
+      this.rippleElement.on(Util.transitionEndSelector(), () => {
         this.rippleElement.remove()
         this.rippleElement = null
       })
@@ -217,7 +217,7 @@ const Ripples = (($) => {
     rippleOn() {
       let size = this._getNewSize()
 
-      if ($.transitionEndSupported()) {
+      if (Util.transitionEndSupported()) {
         this.rippleElement
           .css({
             "-ms-transform": `scale(${size})`,
diff --git a/js/src/util.js b/js/src/util.js
index cfe8f6e4..443fecbd 100644
--- a/js/src/util.js
+++ b/js/src/util.js
@@ -25,7 +25,7 @@ const Util = (($) => {
 
     for (let name in TransitionEndEvent) {
       if (el.style[name] !== undefined) {
-        return TransitionEndEvent[name] //{ end: TransitionEndEvent[name] }
+        return TransitionEndEvent[name] // { end: TransitionEndEvent[name] }
       }
     }
 
@@ -34,17 +34,11 @@ const Util = (($) => {
 
   function setTransitionEndSupport() {
     transitionEnd = transitionEndTest()
-    $.fn.transitionEndSupported = () => {
-      return transitionEnd
-    }
 
-    // generate a selector
+    // generate a concatenated transition end event selector
     for (let name in TransitionEndEvent) {
       transitionEndSelector += ` ${TransitionEndEvent[name]}`
     }
-    $.fn.transitionEndSelector = () => {
-      return transitionEndSelector
-    }          // FIXME: make this a Util.* method instead?
   }
 
   /**
@@ -55,23 +49,22 @@ const Util = (($) => {
 
   let Util = {
 
-    isChar(evt) {
-      if (typeof evt.which == "undefined") {
-        return true
-      } else if (typeof evt.which == "number" && evt.which > 0) {
-        return !evt.ctrlKey && !evt.metaKey && !evt.altKey && evt.which != 8 && evt.which != 9
-      }
-      else {
-        return false
-      }
+    transitionEndSupported() {
+      return transitionEnd
     },
 
-    /*    /!**
-     * Verify if the client browser has transistion support
-     *!/
-     hasTransitionSupport() {
-     return transition
-     }*/
+    transitionEndSelector()  {
+      return transitionEndSelector
+    },
+
+    isChar(evt) {
+      if (typeof evt.which === "undefined") {
+        return true
+      } else if (typeof evt.which === "number" && evt.which > 0) {
+        return !evt.ctrlKey && !evt.metaKey && !evt.altKey && evt.which !== 8 && evt.which !== 9
+      }
+      return false
+    }
   }
 
   setTransitionEndSupport()