The magic behind the React compiler
summary
Claim: a React compiler rewrites components at build time to insert build-time memoization (a hidden $ cache array per component) so useMemo/useCallback become unnecessary in many cases. Implementation uses a Babel plugin and an ESLint rule, produces minified cached code, dead‑code removal and inlining, and shows memoized nodes in DevTools. It is beta, works with React 17–19 and can opt out third‑party components, but may break some libraries and is not yet production‑proven.
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chapters (6)
- 0:00React performance struggles
- 3:44React 19 and compiler reveal
- 7:15Compiler transforms React code
- 10:08Compiler output deep dive
- 17:26Compiler performance gains
- 21:47Q&A on React Compiler
