rollup

Original：🇺🇸 English

Translated

Rollup ES module bundler. Use for library bundling.

1installs

Added on2026-02-11

NPX Install

npx skill4agent add g1joshi/agent-skills rollup

Rollup (v4) is the bundler of choice for libraries. It produces smaller, cleaner code than Webpack and pioneered Tree Shaking.

NPM Packages: Building a library for others to use.
Flat Bundling: "Scope Hoisting" puts everything in one closure for performance.

Rollup analyzes the import graph and excludes unused code statically.

Outputs

esm

cjs

umd

iife

The ecosystem that Vite adopted.

Do:

Use
pkg.exports
: Configure
```
package.json
```
exports correctly for ESM/CJS dual publish.
Externalize dependencies: Don't bundle
```
react
```
into 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.