Chore: Polyfill core-js/array/at for frontend tests

package.json

@@ -73,6 +73,7 @@
     "babel-eslint": "10.1.0",
     "chalk": "4.1.2",
     "chokidar": "3.5.3",
+    "core-js": "3.26.1",
     "cross-env": "7.0.3",
     "dotenv": "14.2.0",
     "eslint": "8.27.0",

packages/admin-test-utils/lib/setup/test-bundler.js

@@ -1,5 +1,11 @@
 'use strict';
 
+// See https://github.com/swc-project/swc/issues/6460
+// SWC is not able to include the core-js polyfill for 
+// array/at automatically at the moment of writing, which
+// makes some frontend tests fail on node@14.
+require('core-js/actual/array/at');
+
 const noop = () => {};
 // eslint-disable-next-line no-undef
 Object.defineProperty(window, 'scrollTo', { value: noop, writable: true });