SASS file are commented in order to generate a living styleguide using npm run livingcss
It is also available at your_local_url/livingcss/html/
and watched by gulp serve
For more details look at : https://github.com/straker/livingcss
Clone the folder in the theme root.
In package.json, add this script in build command:
&& cd livingcss && npm install && gulp livingcss
And this one more in scripts:
"livingcss": "cd livingcss && npm install && gulp livingcss && gulp sass"
npm run build
You can check you're livingcss in your local env like: http://localhost:3000/living-css/html/