React 19 compiler kills useMemo with automatic build-time memoization

Short summary

React 19's compiler automatically applies memoization during build time, eliminating thousands of manual useMemo and useCallback hooks across legacy codebases. The ahead-of-time analyzer understands JavaScript and caches values intelligently, removing subtle dependency bugs. Developers can now focus purely on business logic and component architecture instead of optimization overhead.

• •React 19 compiler automatically memoizes values and functions, removing manual useMemo/useCallback overhead
• •Ahead-of-time compilation analyzes code during build, eliminating dependency array bugs
• •Developers can focus on business logic with cleaner, more declarative code

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