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rollup-pro
Bundle libraries and apps with Rollup: plugins, tree-shaking, multi-format output, code splitting, and watch mode. Use when building distributable JS libraries.
skills/rollup-pro/SKILL.md
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# Rollup Pro
A practical guide to Rollup: the bundler of choice for JavaScript libraries — plugin pipeline, tree-shaking, multi-format output (ESM/CJS), code splitting, and configs that produce clean, minimal distributables.
## Overview
Rollup pioneered ES-module-first bundling and tree-shaking: it understands `import`/`export` statically and drops unused code aggressively. That's why most JS libraries ship Rollup-built bundles. For apps, Vite uses Rollup under the hood for production builds — so Rollup knowledge transfers directly to Vite build tuning.
Core idea: **flat, scope-hoisted bundles with dead code eliminated**, in whatever module formats your consumers need.
## When to use
- Building publishable libraries (components, utilities, SDKs).
- Multi-format output: ESM for bundlers, CJS for Node, UMD/IIFE for script tags.