How to setup Laravel Mix SASS reloading

How to setup the Laravel Mix on version 5.4 to do css livereloading whenever the sass files get compiled? All the tutorials I found are relating to older versions.

I have installed the node modules, and I am running the watch by npm run watch, as stated on the tutorial http://ift.tt/2jNxkeF. So far the webpack.mix.js is as follows:

const { mix } = require('laravel-mix');

mix.js('resources/assets/js/app.js', 'public/js')
   .sass('resources/assets/sass/app.scss', 'public/css');

via Chebli Mohamed