Should you leave Strict Mode enabled in your app permanently, or only use it temporarily?

Strict Mode is generally recommended to stay enabled throughout an entire project's development, since it continues to help catch new problems as the codebase grows and changes over time. It has no effect at all on the production build, so there is no downside to leaving it on during development.

// A typical setup, Strict Mode wraps the whole app and stays enabled long term
import { StrictMode } from 'react';
import { createRoot } from 'react-dom/client';

createRoot(document.getElementById('root')).render(
  <StrictMode>
    <App />
  </StrictMode>
);