jQuery UI is a toolkit for rendering common components, such as datepickers, draggables, etc. No adjustments are needed to make it work with Laravel Mix.
mix.js('resources/assets/js/app.js', 'public/js').sass(
'resources/assets/sass/app.scss',
'public/css'
);
npm install jquery-ui --save-dev
// resources/assets/js/app.js
import $ from 'jquery';
window.$ = window.jQuery = $;
import 'jquery-ui/ui/widgets/datepicker.js';
// resources/assets/sass/app.scss
@import '~jquery-ui/themes/base/all.css';
// resources/assets/js/app.js
$('#datepicker').datepicker();