I let React Compiler handle memoization: Here’s what actually broke

In October 2025, the React compiler v1.0 was released, allowing developers to eliminate useMemo and useCallback hooks, which led to mixed reactions in the React community. The compiler, a Babel plugin, automates memoization by mapping data flow and analyzing code, optimizing React applications by ensuring components re-render only when necessary. While the compiler works well with most code, subtle issues can arise if the code doesn't adhere to React's rules, as shown by challenges encountered with components like UserInviteForm and chart click handlers. Developers are advised to first install updated lint rules to catch potential problems before enabling the compiler. The migration process requires thorough testing, especially with E2E tests to uncover integration timing bugs. The compiler's automatic memoization offers more granular optimization than manual hooks, but certain scenarios, such as third-party libraries needing function identity, may still require explicit useMemo or useCallback hooks, which should always be documented for future reference. Enabling the compiler is a complex process that involves careful consideration and gradual implementation, emphasizing the importance of a mindset shift towards understanding when the compiler cannot handle certain boundaries.

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