react-compiler-runtime

import React, { useState, useMemo } from 'react'; import ReactDOM from 'react-dom/client'; // This component uses a memoized calculation. // With the React Compiler, the `useMemo` call for `expensiveCalculation` // might be automatically inserted or optimized, relying on the // `react-compiler-runtime` under the hood to manage the memoization cache. function MyOptimizedComponent() { const [count, setCount] = useState(0); const [multiplier, setMultiplier] = useState(2); const expensiveCalculation = useMemo(() => { console.log('Calculating expensive value...'); let result = 0; for (let i = 0; i < 1000000; i++) { result += i; } return result * count * multiplier; }, [count, multiplier]); return ( <div> <h1>React Compiler Runtime Demo</h1> <p>Count: {count}</p> <button onClick={() => setCount(c => c + 1)}>Increment Count</button> <p>Multiplier: {multiplier}</p> <button onClick={() => setMultiplier(m => m + 1)}>Increment Multiplier</button> <p>Expensive Calculation Result: {expensiveCalculation}</p> <p> The React Compiler, enabled by `react-compiler-runtime`, aims to automatically memoize parts of your components, making manual `useMemo` and `useCallback` often unnecessary. This example demonstrates a pattern the compiler would optimize. </p> </div> ); } const root = ReactDOM.createRoot(document.getElementById('root')); root.render(<MyOptimizedComponent />); // To run, save as index.tsx, add react and react-dom to package.json, // and set up a build process (e.g., with Vite or Create React App). // Ensure your build setup includes the React Compiler plugin if you want to // observe its effects beyond this conceptual example.