webpack-bootstrap-ui-kit/src/js/ui/datepicker.js

import Events from '../_events';
import Datepicker from 'vanillajs-datepicker/Datepicker';

const init = () => {
  document.querySelectorAll('.js-calendar').forEach((el, i) => {
    const picker = new Datepicker(el);
    el.ui = picker;
  });
};

window.addEventListener(`${Events.LODEDANDREADY}`, init);
window.addEventListener(`${Events.AJAX}`, init);

export default Datepicker;