Jquery in Laravel MIX : Uncaught TypeError: jQuery.easing[this.easing] is not a function

I'm trying to get Jquery + JqueryUI to work properly with Laravel MIX. And it won't.. keeps getting:

       Uncaught TypeError: jQuery.easing[this.easing] is not a function
    at init.run (jquery.js?8262:7179:1)
    at tick (jquery.js?8262:7563:1)
    at jQuery.fx.tick (jquery.js?8262:7906:1)
    at schedule (jquery.js?8262:7282:1)

I already tried to add the "jquery.easing" library to the part.

My webpack looks like this:

mix.js('resources/js/app.js', 'public/js')
    .extract(['jquery', 'jquery-easing', 'bootstrap'])
    .sass('resources/sass/app.scss', 'public/css')
    .sourceMaps();

And my app.js looks like:

require('./bootstrap');

import $ from 'jquery';
window.$ = window.jQuery = $;

import 'jquery-ui/ui/widgets/datepicker.js';
import 'jquery-ui/ui/widgets/autocomplete.js';
import 'jquery.easing';

require('./bootnavbar');