Merge branch...

Merge branch '28837-update-javascript-language-polyfills-with-usebuiltins-and-core-js-v3' into 'master'

Resolve "Update JavaScript language polyfills with UseBuiltins and core-js v3"

Closes #28837

See merge request gitlab-org/gitlab!19629

app/assets/javascripts/commons/polyfills.js

-// ECMAScript polyfills
-import 'core-js/es/array/fill';
-import 'core-js/es/array/find';
-import 'core-js/es/array/find-index';
-import 'core-js/es/array/from';
-import 'core-js/es/array/includes';
-import 'core-js/es/number/is-integer';
-import 'core-js/es/object/assign';
-import 'core-js/es/object/values';
-import 'core-js/es/object/entries';
-import 'core-js/es/promise';
-import 'core-js/es/promise/finally';
-import 'core-js/es/string/code-point-at';
-import 'core-js/es/string/from-code-point';
-import 'core-js/es/string/includes';
-import 'core-js/es/string/starts-with';
-import 'core-js/es/string/ends-with';
-import 'core-js/es/symbol';
-import 'core-js/es/map';
-import 'core-js/es/weak-map';
-import 'core-js/modules/web.url';
+import 'core-js/stable';
 
 // Browser polyfills
 import 'formdata-polyfill';

app/assets/javascripts/test_utils/index.js

-import 'core-js/es/map';
-import 'core-js/es/set';
 import { Sortable } from 'sortablejs';
 import simulateDrag from './simulate_drag';
 import simulateInput from './simulate_input';

babel.config.js

@@ -6,6 +6,8 @@ const presets = [
   [
     '@babel/preset-env',
     {
+      useBuiltIns: 'usage',
+      corejs: { version: 3, proposals: true },
       modules: false,
       targets: {
         ie: '11',
@@ -51,4 +53,4 @@ if (isJest) {
   plugins.push('babel-plugin-dynamic-import-node');
 }
 
-module.exports = { presets, plugins };
+module.exports = { presets, plugins, sourceType: 'unambiguous' };