The React Compiler Is Here You Can Delete Half Your useMemo and useCallback

I opened a PR last week and my senior dev left one comment: "Why are you still writing useMemo? The compiler handles this now." I paused. Closed my laptop. Stared at the wall. Because I had spent two years carefully wrapping calculations in useMemo , obsessing over dependency arrays, and arguing in code reviews about when to use useCallback . And apparently... I didn't need to do most of it. Here's everything you need to know about React Compiler — and yes, what you can actually delete. 🚀 What Even Is React Compiler? For years, React performance optimization felt like a ritual nobody fully understood. You'd sprinkle useMemo everywhere. Wrap callbacks in useCallback . Forget a dependency. Break something. Fix it. Add React.memo to a component. Argue with your team about whether it was necessary. React Compiler ends this. It's a build-time tool that analyzes your components and automatically applies memoization where it's needed — without you writing a single useMemo or useCallback . The