Dependency Adding 500KB to Bundle Size
A small feature was added via npm package but bundle size increased 500KB. The feature doesn't justify the size increase. Build tools show the dependency is being included but it's rarely used, or lighter alternatives exist.
Adding the dependency solved a problem but created a new one: application loads slower for all users.
Error Messages You Might See
Common Causes
- Package includes entire library when only one function is needed
- No tree-shaking configuration, entire package included despite partial use
- Dependency has heavy transitive dependencies (dependencies of dependencies)
- Duplicate dependencies at different versions in node_modules
- Development dependency accidentally included in production bundle
How to Fix It
Analyze bundle: webpack-bundle-analyzer, source-map-explorer show what takes space. Check package sizes on bundlephobia.com. Look for lighter alternatives. Use only needed exports: import { func } from 'lib' not import lib. Ensure devDependencies aren't bundled. Deduplicate: npm dedupe. Lazy load heavy dependencies.
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Get HelpFrequently Asked Questions
How to analyze what's in the bundle?
Use webpack-bundle-analyzer (webpack-bundle-analyzer plugin) or source-map-explorer. Visualizes what takes space.
Should all dependencies be in package.json?
devDependencies for build tools, testing. dependencies for runtime. Never mix them.
How to reduce dependency size?
Use lighter alternatives (lodash-es instead of lodash). Lazy load: const lib = () => import('heavy-lib'). Tree-shake unused code.