importing jquery-ui widgets in modern code

datepicker.ts

/// <reference path="../../../../node_modules/@types/jqueryui/index.d.ts" />
import "jquery-ui/ui/core";
import "jquery-ui/ui/keycode";
import "jquery-ui/ui/widgets/datepicker";

$("#my-datepicker").datepicker({
    showButtonPanel: true,
    changeMonth: true,
    changeYear: true,
    buttonImage: "/images/structure/calendar-ico.png",
    buttonImageOnly: true,
    showOn: "both"
  });