Update templates to use createRoot

Author: kyletsang

packages/cra-template-typescript/template/src/index.tsx

@@ -1,14 +1,16 @@
 import React from 'react';
-import ReactDOM from 'react-dom';
+import ReactDOM from 'react-dom/client';
 import './index.css';
 import App from './App';
 import reportWebVitals from './reportWebVitals';
 
-ReactDOM.render(
+const root = ReactDOM.createRoot(
+  document.getElementById('root') as HTMLElement
+);
+root.render(
   <React.StrictMode>
     <App />
-  </React.StrictMode>,
-  document.getElementById('root')
+  </React.StrictMode>
 );
 
 // If you want to start measuring performance in your app, pass a function

packages/cra-template/template/src/index.js

@@ -1,14 +1,14 @@
 import React from 'react';
-import ReactDOM from 'react-dom';
+import ReactDOM from 'react-dom/client';
 import './index.css';
 import App from './App';
 import reportWebVitals from './reportWebVitals';
 
-ReactDOM.render(
+const root = ReactDOM.createRoot(document.getElementById('root'));
+root.render(
   <React.StrictMode>
     <App />
-  </React.StrictMode>,
-  document.getElementById('root')
+  </React.StrictMode>
 );
 
 // If you want to start measuring performance in your app, pass a function