Rollup Plugin Lib Style

A Rollup plugin for building component libraries with tree-shakeable, per-component CSS. Version 2.5.0 (stable). It converts CSS and preprocessor files (SASS/SCSS, Less, Stylus) into CSS modules, generating a separate CSS file per component with scoped class names. Unlike single CSS file bundling (bloat) or CSS-in-JS (runtime overhead), this plugin outputs plain CSS with zero runtime cost and automatic scoping. Works with preserveModules and code splitting. ESM-only, requires Node >=16. Ships TypeScript types.