Upgrade to React 18
Upgrading an existing React application to version 18 only requires two steps.
If you are already using the latest version of
which uses React version 18 you can skip this section.
Step 1: Install React 18
To install the latest version, from your project folder run the following from the terminal:
Step 2: Use the new root API
In order to take advantage of React 18's concurrent features you'll need to use the new root API for client rendering.
// Before import ReactDOM from 'react-dom'; ReactDOM.render(<App />, document.getElementById('root')); // After import ReactDOM from 'react-dom/client'; const root = ReactDOM.createRoot(document.getElementById('root')); root.render(<App />);
Your application will work without using the new root API. If you continue to use
ReactDOM.render your application will behave like React 17.