discourse/app/assets/javascripts/discourse/scripts/google-universal-analytics-v4.js

(function () {
  const gaDataElement = document.getElementById("data-ga-universal-analytics");
  window.dataLayer = window.dataLayer || [];

  window.gtag = function () {
    window.dataLayer.push(arguments);
  };
  window.gtag("js", new Date());

  let autoLinkConfig = {};

  if (gaDataElement.dataset.autoLinkDomains.length) {
    const autoLinkDomains = gaDataElement.dataset.autoLinkDomains.split("|");
    autoLinkConfig = {
      linker: {
        accept_incoming: true,
        domains: autoLinkDomains,
      },
    };
  }
  window.gtag("config", gaDataElement.dataset.trackingCode, {
    send_page_view: false,
    autoLinkConfig,
  });
})();