Sample Sweet Alert Script

/**
 * @NApiVersion 2.x
 * @NScriptType ClientScript
 */

define(['N/ui/dialog'], function(dialog) {

    function showAlert() {
        swal("Hello, world!");
    }

    function showConfirmation() {
        swal({
            title: "Are you sure?",
            text: "Once deleted, you will not be able to recover this record!",
            icon: "warning",
            buttons: true,
            dangerMode: true,
        })
        .then((willDelete) => {
            if (willDelete) {
                swal("Poof! Your record has been deleted!", {
                    icon: "success",
                });
            } else {
                swal("Your record is safe!");
            }
        });
    }

    return {
        pageInit: function(context) {
            // Example usage when page loads
            showAlert();
        },
        showAlert: showAlert,
        showConfirmation: showConfirmation
    };
});