React 18의 createRoot (ReactDOM.render Warning)

리액트 버전 18에 와서 평소처럼 npm run start를 했는데, 다음과 같은 에러 메세지가 콘솔창에 나타났다. Warning: ReactDOM.render is no longer supported in React 18. Use createRoot instead. Until you switch to the new API, your app will behave as if it's running React 17. Learn more: https://reactjs.org/link/switch-to-createroot How to Upgrade to React 18 – React Blog As we shared in the release post, React 18 introduces features powe..