test: Upgrade react to 18 on branch smartshift-thomasuster-1691605818

src/App.test.js

@@ -1,8 +1,9 @@
 import React from 'react';
-import ReactDOM from 'react-dom';
+import { createRoot } from 'react-dom/client';
 import App from './App';
 
 it('renders without crashing', () => {
   const div = document.createElement('div');
-  ReactDOM.render(<App />, div);
-});
+  const root = createRoot(div);
+  root.render(<App />);
+});

src/index.js

@@ -1,8 +1,10 @@
 import React from 'react';
-import ReactDOM from 'react-dom';
+import { createRoot } from 'react-dom/client';
 import './index.css';
 import App from './App';
 import registerServiceWorker from './registerServiceWorker';
 
-ReactDOM.render(<App />, document.getElementById('root'));
-registerServiceWorker();
+const container = document.getElementById('root');
+const root = createRoot(container);
+root.render(<App />);
+registerServiceWorker();