Index: frontend/node_modules/react-app-polyfill/stable.js
===================================================================
--- frontend/node_modules/react-app-polyfill/stable.js	(revision 9af201e94b5a79beb92a30858fc54de4bc3b9449)
+++ frontend/node_modules/react-app-polyfill/stable.js	(revision 9af201e94b5a79beb92a30858fc54de4bc3b9449)
@@ -0,0 +1,13 @@
+/**
+ * Copyright (c) 2015-present, Facebook, Inc.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+'use strict';
+
+// Polyfill stable language features.
+// It's recommended to use @babel/preset-env and browserslist
+// to only include the polyfills necessary for the target browsers.
+require('core-js/stable');
+require('regenerator-runtime/runtime');