The **fis3‑preprocessor‑css2js** plugin lets developers using the **FIS3** front‑end build tool convert CSS (including SCSS and LESS) files into JavaScript modules. By preprocessing matched style files into `.js` assets, the styles can be loaded with standard JS `require` calls (e.g., `require('css/xxx.css')`). It’s aimed at front‑end engineers who want to manage CSS through the FIS3 module system.