Rollup
Rollup ES module bundler. Use for library bundling.From its SKILL.md
npx -y skills add G1Joshi/Agent-Skills --skill rollupAssembled from the repository path, not quoted from the project. Check it against their README if it does not work.
One thing to look at
- 12 stars12 stars. Stars are a popularity signal and not a quality one, but at this level it is likely that nobody has read this closely except its author, and you would be relying on your own review.
SKILL.md
1.0 KB, 229 tokens by cl100k_base, as published. Nobody here has run it
Rollup
Rollup (v4) is the bundler of choice for libraries. It produces smaller, cleaner code than Webpack and pioneered Tree Shaking.
When to Use
- NPM Packages: Building a library for others to use.
- Flat Bundling: "Scope Hoisting" puts everything in one closure for performance.
Core Concepts
Tree Shaking
Rollup analyzes the import graph and excludes unused code statically.
Formats
Outputs esm, cjs, umd, iife.
Plugins
The ecosystem that Vite adopted.
Best Practices (2025)
Do:
- Use
pkg.exports: Configurepackage.jsonexports correctly for ESM/CJS dual publish. - Externalize dependencies: Don't bundle
reactinto your library. Mark it as external.
Don't:
- Don't use for Apps: Use Vite (which uses Rollup internally) for apps. Use Rollup directly for libs.
References
What ships with it
Read from the repository
Just SKILL.md. No reference files, no scripts.