In this tutorial, you’ll learn about how the React Compiler works to optimize React applications. React has been a reliable UI library for over a decade, offering component architecture, uni-directional data flow, and declarative features that help build scalable software. Memoization techniques like React.memo() and hooks like useMemo() and useCallback() optimize performance by caching results. However, over-optimization can hurt performance. With React 19, new features like an experimental open-source compiler, React Server Components, and improved APIs enhance optimization. The React Compiler shifts the burden of optimization to the compiler. Configuring the compiler involves using Babel and ESLint plugins. The compiler identifies functions to optimize, creates an AST, performs validations, eliminates dead code, and optimizes using memoization. The React DevTools badge shows components optimized by the compiler. The compiler’s logic aims to reduce unnecessary renders and optimize components and hooks automatically. Developers can opt in and out of the compiler using annotations.
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