diff --git a/app/assets/javascripts/layout_nav.js b/app/assets/javascripts/layout_nav.js
index a6f82b247e2..ab3cc29146a 100644
--- a/app/assets/javascripts/layout_nav.js
+++ b/app/assets/javascripts/layout_nav.js
@@ -1,59 +1,51 @@
-/* eslint-disable func-names, space-before-function-paren, no-var, prefer-arrow-callback, no-unused-vars, one-var, one-var-declaration-per-line, vars-on-top, max-len */
-import _ from 'underscore';
-import Cookies from 'js-cookie';
 import ContextualSidebar from './contextual_sidebar';
 import initFlyOutNav from './fly_out_nav';
 
-(function() {
-  var hideEndFade;
+function hideEndFade($scrollingTabs) {
+  $scrollingTabs.each(function scrollTabsLoop() {
+    const $this = $(this);
+    $this.siblings('.fade-right').toggleClass('scrolling', $this.width() < $this.prop('scrollWidth'));
+  });
+}
 
-  hideEndFade = function($scrollingTabs) {
-    return $scrollingTabs.each(function() {
-      var $this;
-      $this = $(this);
-      return $this.siblings('.fade-right').toggleClass('scrolling', $this.width() < $this.prop('scrollWidth'));
-    });
-  };
+export default function initLayoutNav() {
+  const contextualSidebar = new ContextualSidebar();
+  contextualSidebar.bindEvents();
+
+  initFlyOutNav();
 
   $(document).on('init.scrolling-tabs', () => {
     const $scrollingTabs = $('.scrolling-tabs').not('.is-initialized');
     $scrollingTabs.addClass('is-initialized');
 
-    hideEndFade($scrollingTabs);
-    $(window).off('resize.nav').on('resize.nav', function() {
-      return hideEndFade($scrollingTabs);
-    });
-    $scrollingTabs.off('scroll').on('scroll', function(event) {
-      var $this, currentPosition, maxPosition;
-      $this = $(this);
-      currentPosition = $this.scrollLeft();
-      maxPosition = $this.prop('scrollWidth') - $this.outerWidth();
+    $(window).on('resize.nav', () => {
+      hideEndFade($scrollingTabs);
+    }).trigger('resize.nav');
+
+    $scrollingTabs.on('scroll', function tabsScrollEvent() {
+      const $this = $(this);
+      const currentPosition = $this.scrollLeft();
+      const maxPosition = $this.prop('scrollWidth') - $this.outerWidth();
+
       $this.siblings('.fade-left').toggleClass('scrolling', currentPosition > 0);
-      return $this.siblings('.fade-right').toggleClass('scrolling', currentPosition < maxPosition - 1);
+      $this.siblings('.fade-right').toggleClass('scrolling', currentPosition < maxPosition - 1);
     });
 
-    $scrollingTabs.each(function () {
-      var $this = $(this);
-      var scrollingTabWidth = $this.width();
-      var $active = $this.find('.active');
-      var activeWidth = $active.width();
+    $scrollingTabs.each(function scrollTabsEachLoop() {
+      const $this = $(this);
+      const scrollingTabWidth = $this.width();
+      const $active = $this.find('.active');
+      const activeWidth = $active.width();
 
       if ($active.length) {
-        var offset = $active.offset().left + activeWidth;
+        const offset = $active.offset().left + activeWidth;
 
         if (offset > scrollingTabWidth - 30) {
-          var scrollLeft = scrollingTabWidth / 2;
-          scrollLeft = (offset - scrollLeft) - (activeWidth / 2);
+          const scrollLeft = (offset - (scrollingTabWidth / 2)) - (activeWidth / 2);
+
           $this.scrollLeft(scrollLeft);
         }
       }
     });
-  });
-
-  $(() => {
-    const contextualSidebar = new ContextualSidebar();
-    contextualSidebar.bindEvents();
-
-    initFlyOutNav();
-  });
-}).call(window);
+  }).trigger('init.scrolling-tabs');
+}
diff --git a/app/assets/javascripts/main.js b/app/assets/javascripts/main.js
index 15a3a91c5f5..59bfa482bb0 100644
--- a/app/assets/javascripts/main.js
+++ b/app/assets/javascripts/main.js
@@ -41,7 +41,7 @@ import Flash, { removeFlashClickListener } from './flash';
 import './gl_dropdown';
 import initTodoToggle from './header';
 import initImporterStatus from './importer_status';
-import './layout_nav';
+import initLayoutNav from './layout_nav';
 import LazyLoader from './lazy_loader';
 import './line_highlighter';
 import initLogoAnimation from './logo';
@@ -89,6 +89,7 @@ $(function () {
   var fitSidebarForSize;
 
   initBreadcrumbs();
+  initLayoutNav();
   initImporterStatus();
   initTodoToggle();
   initLogoAnimation();
@@ -261,8 +262,6 @@ $(function () {
 
   renderTimeago();
 
-  $(document).trigger('init.scrolling-tabs');
-
   $('form.filter-form').on('submit', function (event) {
     const link = document.createElement('a');
     link.href = this.action;