Use import instead of require

spec/javascripts/copy_as_gfm_spec.js

-require('~/copy_as_gfm');
+import '~/copy_as_gfm';
 
 (() => {
   describe('gl.CopyAsGFM', () => {

spec/javascripts/filtered_search/components/recent_searches_dropdown_content_spec.js

@@ -2,7 +2,7 @@ import Vue from 'vue';
 import eventHub from '~/filtered_search/event_hub';
 import RecentSearchesDropdownContent from '~/filtered_search/components/recent_searches_dropdown_content';
 
-require('~/filtered_search/filtered_search_token_keys');
+import '~/filtered_search/filtered_search_token_keys';
 
 const createComponent = (propsData) => {
   const Component = Vue.extend(RecentSearchesDropdownContent);