React Bundle Optimization

Optimize React bundle for production.

Analyze Bundle

npm install --save-dev webpack-bundle-analyzer

// webpack.config.js
const BundleAnalyzerPlugin = require('webpack-bundle-analyzer').BundleAnalyzerPlugin;

module.exports = {
  plugins: [new BundleAnalyzerPlugin()]
};

Tree Shaking

Import only what you need:

// Bad
import _ from 'lodash';

// Good
import debounce from 'lodash/debounce';

Dynamic Imports

// Instead of
import HeavyComponent from './Heavy';

// Use
const HeavyComponent = lazy(() => import('./Heavy'));

Remove Source Maps in Production

// .env.production
GENERATE_SOURCEMAP=false

Compress with Gzip/Brotli

Enable in server configuration.

CDN for Dependencies

<script src="https://cdn.jsdelivr.net/npm/react@18/umd/react.production.min.js"></script>

Remember

• Analyze bundle first
• Use dynamic imports
• Tree shake unused code
• Compress assets
• Use CDN when possible

Next: Learn CI/CD!