Level 51
Have you had a look at Laravel mix?
It simplifies you configuration to something like
mix.styles(['resources/css/test.css'], 'public/css/all.css');
mix.js('resources/js/app.js', 'public/js');
This will compile all you css into public/css/all.css and your javascript to public/js/app.js So you can include them in your main layout.
You can also use mix outside of a laravel application
https://www.sitepoint.com/use-laravel-mix-non-laravel-projects/