rollup-plugin-postcss

A Rollup plugin that seamlessly integrates PostCSS processing into your build pipeline, supporting CSS imports, CSS modules, Sass/Stylus/Less preprocessors, and CSS extraction. Version 3.0.9 is current stable, requires Rollup v2, and uses the modern Sass API to avoid deprecation warnings. It ships TypeScript types and defaults to injecting CSS into the DOM. Key differentiators: simple setup, automatic local PostCSS config detection, and support for CSS-in-JS via style export.