How does React’s useInsertionEffect hook differ from useLayoutEffect and what is its specific use case?

Question

React Developer — Hard

How does React’s useInsertionEffect hook differ from useLayoutEffect and what is its specific use case?

Accepted Answer

useInsertionEffect fires before any DOM mutations, allowing CSS-in-JS libraries to inject styles early; useLayoutEffect runs after mutations but before paint, making it suitable for DOM manipulation.