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What is the role of a bundler like Webpack in a React project?

Q: What is the role of a bundler like Webpack in a React project?

**Core concept (TL;DR).** Browsers can't run JSX/TypeScript or efficiently load hundreds of separate module files. A **bundler** (Webpack, **Vite**, esbuild, Rollup) **transpiles** your JSX/TS (via Babel/SWC), **bundles** modules into optimized files, processes assets (CSS/images), enables **code-splitting** and **tree-shaking**, and runs a dev server with **hot module replacement**. Source modules → transpile + bundle → browser assets <text x="90" y="76" fill="#8b5cf6" font-size="9.5" font-weight="700" text-anchor="

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What the bundler turns your entry into

// You write modular JSX/TS:
//   src/index.jsx → imports App → imports Button, api, styles.css …
//
// The bundler (Webpack/Vite) produces browser-ready output:
//   dist/
//     index.html
//     assets/index-a1b2c3.js     (your app, transpiled + minified)
//     assets/vendor-d4e5f6.js    (React etc., split for caching)
//     assets/Settings-7890.js    (lazy route chunk, loaded on demand)
//
// Transpilation example (Babel/SWC): JSX → React.createElement
const el = <h1>Hi</h1>;             // becomes createElement("h1", null, "Hi")
export default function App() { return el; }

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