first upload all files

Modules/Admin/Resources/assets/js/main.js

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+window._ = require('lodash');
+window.Sortable = require('sortablejs');
+window.$ = window.jQuery = require('jquery');
+
+require('bootstrap');
+require('selectize');
+require('flatpickr');
+require('jquery-slimscroll');
+require('mousetrap');
+require('datatables.net');
+require('datatables.net-bs');
+
+require('./app');
+require('./wysiwyg');
+require('./jquery.keypressAction');
+
+import Admin from './Admin';
+import Form from './Form';
+import DataTable from './DataTable';
+import { trans, keypressAction, notify, info, success, warning, error } from './functions';
+
+window.admin = new Admin();
+window.form = new Form();
+window.DataTable = DataTable;
+
+window.trans = trans;
+window.keypressAction = keypressAction;
+window.notify = notify;
+window.info = info;
+window.success = success;
+window.warning = warning;
+window.error = error;
+
+$.ajaxSetup({
+    headers: {
+        'Authorization': FleetCart.apiToken,
+        'X-CSRF-TOKEN': FleetCart.csrfToken,
+    },
+});
+
+$(document).on('preInit.dt', () => {
+    $('.dataTables_length select').addClass('custom-select-black');
+});