whmcsProxmoxAddon/templates/admin/js_assets.tpl

<script type="text/javascript" src="{$assetsURL}/js/vue.min.js"></script>
{*script type="text/javascript" src="https://unpkg.com/vue"></script>*}
<script type="text/javascript" src="{$assetsURL}/js/moment.js"></script>
<script type="text/javascript" src="{$assetsURL}/js/mgComponents.js"></script>
<script type="text/javascript" src="{$assetsURL}/js/jscolor.min.js"></script>
<script type="text/javascript" src="{$assetsURL}/js/layers-ui.js"></script>
<script type="text/javascript" src="{$assetsURL}/js/layers-ui-table.js"></script>    
<script type="text/javascript" src="{$assetsURL}/js/chart.min.js"></script>