Originally published at recca0120.github.io React Compiler reached 1.0 stable in October 2025 — it auto-applies what useMemo / useCallback / React.memo do by hand. Most tutorials online still teach the old react({ babel: { plugins: [...] } }) form, which no longer works on Vite 8 + @vitejs/plugin-react v6. v6 made one big change: internal Babel was dropped in favor of oxc. JSX transform and Fast R