React 19 and the Compiler for the Rest of Us
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Introduces the React compiler in React 19 and how to adopt it: installing React 19, checking compatibility and disabling custom runtime code if needed, and using the compiler with React 17/18 when runtime support exists. Explains what the compiler does (JavaScript-to-JavaScript translation, error reporting, static optimizations like removing useMemo and optimizing initialization), how that yields granular reactivity and fewer renders, and practical concerns such as testing custom hooks, build-time impact, debugging with Chrome source maps, and the removal of the global JSX namespace.
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