how to use package json in laravel code example

Example 1: package.json laravel best

mix.stylus('resources/assets/stylus/app.styl', 'public/css');

Example 2: package.json laravel best

mix.styles([
    'public/css/vendor/normalize.css',
    'public/css/vendor/videojs.css'
], 'public/css/all.css');