CSS

npm sass install

// for global use
npm install -g sass

// package.json
"scripts": {
   "compile:sass": "sass ./style.scss ./style.css -w"
 }  
 npm run complie:sass

npm scss

npm i node-sass

scss npm

var sass = require('node-sass');
sass.render({
  file: scss_filename,
  [, options..]
}, function(err, result) { /*...*/ });
// OR
var result = sass.renderSync({
  data: scss_content
  [, options..]
});