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

import Events from '../_events';
import Consts from '../_consts';
import SpinnerUI from './loading-spinner';

const MainUI = ((window) => {
  const NAME = '_main';
  const BODY = document.body;

  console.info(
    `%cUI Kit ${UINAME} ${UIVERSION}`,
    'color:yellow;font-size:14px'
  );
  console.info(
    `%c${UIMetaNAME} ${UIMetaVersion}`,
    'color:yellow;font-size:12px'
  );
  console.info(
    `%chttps://github.com/a2nt/webpack-bootstrap-ui-kit by ${UIAUTHOR}`,
    'color:yellow;font-size:10px'
  );

  console.info(`%cENV: ${process.env.NODE_ENV}`, 'color:green;font-size:10px');
  console.groupCollapsed('Events');
  Object.keys(Events).forEach((k) => {
    console.info(`${k}: ${Events[k]}`);
  });
  console.groupEnd('Events');

  console.groupCollapsed('Consts');
  Object.keys(Consts).forEach((k) => {
    console.info(`${k}: ${Consts[k]}`);
  });
  console.groupEnd('Events');

  console.groupCollapsed('Init');
  console.time('init');

  class MainUI {
    // first time the website initialization
    static init() {
      const ui = this;

      // store landing page state
      window.history.replaceState(
        {
          landing: window.location.href,
        },
        document.title,
        window.location.href
      );
      //

      ui.loaded();
    }

    // init AJAX components
    static loaded() {
      const ui = this;
      console.log(`${NAME}: loaded`);
    }
  }

  const documentInit = () => {
    MainUI.init();

    BODY.classList.add('loaded');
    SpinnerUI.hide();

    console.groupEnd('init');
    console.timeEnd('init');

    window.addEventListener(`${Events.LOADED}`, (event) => {
      window.dispatchEvent(new Event(Events.LODEDANDREADY));
    });
  };

  if (document.readyState === 'loading') {  // Loading hasn't finished yet
    document.addEventListener(`${Events.DOMLOADED}`, documentInit);
  }else {
    documentInit();
  }

  window.addEventListener(`${Events.AJAX}`, () => {
    MainUI.loaded();
  });

  window.MainUI = MainUI;

  return MainUI;
})(window);

export default MainUI;