Media Library Pro uses a CDN to load the Sortable library. Sortable provides the drag-and-drop-ability inside a Media Library Pro component.
If you would like to disable the loading via CDN and want to take care by yourself of including Sortable you will need to add the following option to your media-library.php
config file.
...
'include_sortable_cdn_script' => false,
...
You can install Sortable within your project dependencies and include it in your app.js
.
import Sortable from 'sortablejs'
window.Sortable = Sortable