react-19

The React 19 compiler handles memoization automatically by optimizing component rendering during build time, eliminating the need to manually apply useMemo or useCallback hooks to prevent unnecessary re-renders.

Yes, you should remove manual useMemo and useCallback hooks when adopting React 19. The compiler-based patterns automatically optimize rendering, allowing you to simplify component logic and improve code readability.

Server components in React 19 clarify data flow by separating server and client concerns. Adopting a server-components-first architecture streamlines data passing across boundaries without requiring manual memoization.

Applying React 19 compiler-based patterns requires a React 19 compatible setup with a server-components-first architecture and explicit imports. This environment is necessary to properly skip manual memoization.

The best way to refactor existing React components for React 19 is to rewrite them by removing explicit useMemo and useCallback hooks, relying instead on compiler-assisted optimizations to streamline data flow and consistency.