Compile SCSS in 11ty

style.11ty.js

 const sass = require('sass');
 const cleanCSS = require('clean-css');
 
 module.exports = class {
     data() {
         return {
             layout: false,
             permalink: '/style.css',
             eleventyExcludeFromCollections: true,
         };
     }
 
     async render() {
        // Compile SCSS
        const { css } = sass.renderSync({
            file: './assets/sass/style.scss',
        });
 
        let compiledCSS = css.toString();
        compiledCSS = new cleanCSS().minify(compiledCSS).styles; // Minify
        return compiledCSS;
     }
};