The **rollup‑plugin‑scss** package is a Rollup plugin that lets you import `.scss`, `.sass` and `.css` files directly in your JavaScript bundle, compiles them with Sass (node‑sass or Dart‑sass), and writes the resulting CSS to a single output file (or injects it as a string). It’s aimed at front‑end developers using Rollup who need convenient Sass preprocessing, source‑map support, and optional post‑CSS processing for their web projects.