Dependency Arrays are finally dead ⚰️ . The most annoying part of React has always been manual memoization 👇 . Should I wrap this in useMemo? Did I miss a variable in the dependency array []? Why is this component re-rendering? 👉 We spent years fighting with useCallback and React.memo to prevent unnecessary renders. React 19 paves the way for the React Compiler (formerly React Forget). ❌ The Old Way (Manual): You act as the compiler. You manually tell React: "Only re-calculate this if [x, y] changes." It bloats your code and is the #1 source of stale closure bugs. ✅ The Modern Way (Automatic): You write plain JavaScript. The Compiler analyzes your code at build time. It automatically memoizes values and functions that need it. • No useMemo: Deleted. • No useCallback: Deleted. • No Dependency Arrays: Gone. The Shift: React is finally becoming truly "Reactive." You focus on the logic; React focuses on the performance. Note: The React Compiler is an optional build-time tool compatible with React 19. #ReactJS #React19 #ReactCompiler #WebDevelopment #Frontend #JavaScript #CleanCode #SoftwareEngineering #TechTips #ReactFeature #ReactHooks #Hooks #ReactTips #FrontrendDeveloper #DevloperTips
Is react compiler stable now?
It’s great. And it works with 17, 18, and 19 btw.
Nice joke.
It’s a simple JavaScript logic and was present in the older version as well. React.memo and useCallback should not be used in every case. They are meant for scenarios with complex logic—either to memoize expensive computations or to prevent unnecessary re-renders where there is a real performance benefit.