decorate URL with ga_cid param

ga_cid.js

const decorateLink = (src) => {
  const gacid = getUrlParameter('_ga');
  if (isWidgetShowroom() && gacid) {
    return `${src}&_ga=${gacid}`;
  }
  if (window.ga && window.ga.getAll) {
    window.ga('require', 'linker');
    const tracker = window.ga.getAll()[0];
    const googleAnalyticsLinker = window.gaplugins ? (new window.gaplugins.Linker(tracker)) : null;
    return googleAnalyticsLinker ? googleAnalyticsLinker.decorate(src) : src;
  }
  return src;
};

const src = 'https://api.ticketscloud.com/widget?event=asdfasdfdsf&token=3e32432';
const iframeSrc = decorateLink(src);