rollup
Provides comprehensive guidance for Rollup bundler including configuration, plugins, code splitting, tree shaking, and multi-format library bundling. Use when the user asks about Rollup, needs to bundle JavaScript libraries, optimize output with tree shaking, or configure ESM/CJS builds.
Best use case
rollup is best used when you need a repeatable AI agent workflow instead of a one-off prompt. It is especially useful for teams working in multi. Provides comprehensive guidance for Rollup bundler including configuration, plugins, code splitting, tree shaking, and multi-format library bundling. Use when the user asks about Rollup, needs to bundle JavaScript libraries, optimize output with tree shaking, or configure ESM/CJS builds.
Provides comprehensive guidance for Rollup bundler including configuration, plugins, code splitting, tree shaking, and multi-format library bundling. Use when the user asks about Rollup, needs to bundle JavaScript libraries, optimize output with tree shaking, or configure ESM/CJS builds.
Users should expect a more consistent workflow output, faster repeated execution, and less time spent rewriting prompts from scratch.
Practical example
Example input
Use the "rollup" skill to help with this workflow task. Context: Provides comprehensive guidance for Rollup bundler including configuration, plugins, code splitting, tree shaking, and multi-format library bundling. Use when the user asks about Rollup, needs to bundle JavaScript libraries, optimize output with tree shaking, or configure ESM/CJS builds.
Example output
A structured workflow result with clearer steps, more consistent formatting, and an output that is easier to reuse in the next run.
When to use this skill
- Use this skill when you want a reusable workflow rather than writing the same prompt again and again.
When not to use this skill
- Do not use this when you only need a one-off answer and do not need a reusable workflow.
- Do not use it if you cannot install or maintain the related files, repository context, or supporting tools.
Installation
Claude Code / Cursor / Codex
Manual Installation
- Download SKILL.md from GitHub
- Place it in
.claude/skills/rollup/SKILL.mdinside your project - Restart your AI agent — it will auto-discover the skill
How rollup Compares
| Feature / Agent | rollup | Standard Approach |
|---|---|---|
| Platform Support | Not specified | Limited / Varies |
| Context Awareness | High | Baseline |
| Installation Complexity | Unknown | N/A |
Frequently Asked Questions
What does this skill do?
Provides comprehensive guidance for Rollup bundler including configuration, plugins, code splitting, tree shaking, and multi-format library bundling. Use when the user asks about Rollup, needs to bundle JavaScript libraries, optimize output with tree shaking, or configure ESM/CJS builds.
Where can I find the source code?
You can find the source code on GitHub using the link provided at the top of the page.
SKILL.md Source
## When to use this skill
Use this skill whenever the user wants to:
- Bundle JavaScript libraries with tree shaking and multi-format output (ESM/CJS/UMD)
- Configure Rollup input, output, plugins, and external dependencies
- Optimize bundle size with code splitting and dead code elimination
- Build libraries for npm distribution
## How to use this skill
### Workflow
1. **Configure** — create `rollup.config.js` with input, output, and plugins
2. **Build** — run `rollup -c` to generate bundles
3. **Validate** — check output formats, bundle size, and tree shaking effectiveness
4. **Publish** — set `main`, `module`, and `exports` in `package.json`
### Quick Start Example
```javascript
// rollup.config.js
import resolve from '@rollup/plugin-node-resolve';
import commonjs from '@rollup/plugin-commonjs';
import terser from '@rollup/plugin-terser';
export default {
input: 'src/index.js',
output: [
{
file: 'dist/index.cjs.js',
format: 'cjs',
sourcemap: true,
},
{
file: 'dist/index.esm.js',
format: 'es',
sourcemap: true,
},
],
external: ['react', 'react-dom'], // Don't bundle peer deps
plugins: [
resolve(),
commonjs(),
terser(), // Minify for production
],
};
```
```bash
# Build
npx rollup -c
# Watch mode for development
npx rollup -c --watch
```
```json
// package.json — library distribution fields
{
"main": "dist/index.cjs.js",
"module": "dist/index.esm.js",
"exports": {
".": {
"import": "./dist/index.esm.js",
"require": "./dist/index.cjs.js"
}
},
"files": ["dist"],
"sideEffects": false
}
```
### Code Splitting Example
```javascript
// Dynamic imports create separate chunks
export default {
input: 'src/index.js',
output: {
dir: 'dist',
format: 'es',
chunkFileNames: 'chunks/[name]-[hash].js',
},
plugins: [resolve(), commonjs()],
};
```
## Best Practices
- Mark peer dependencies as `external` to avoid bundling them
- Enable sourcemaps for debugging; disable in production if not needed
- Use `sideEffects: false` in `package.json` to enable maximum tree shaking
- For large dependencies, externalize them to reduce bundle size
- Use code splitting with dynamic `import()` for on-demand loading
## Reference
- Official documentation: https://rollupjs.org/
## Keywords
rollup, bundler, ESM, CJS, tree-shaking, code splitting, library bundling, pluginsRelated Skills
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