ws_scss compiles SCSS directly into CSS within TYPO3—without a separate Node.js build chain. Modified partials are automatically recompiled and cached on a per-file basis.
Examples from this demo: The Site Package template includes about 246 SCSS source files (entry point base-layout.scss plus Bootstrap partials). ws_scss 14.0.5 compiles them on the server into /typo3temp/assets/css/template/main.css —this file is loaded in the header of every page, including this one. The color schemes for the demo widget (Light / Dark / Contrast) come from _variables-dark.scss or _variables-contrast-high.scss.