initialize.js

// This snippet is run when the React app has completed rendering the first page

// wait for OneTrust to be initialized
await waitForOneTrust();
try {
  window.OneTrust.LoadBanner();
} catch(err) {
  console.log('Error loading banner', err);
}
initGTM();
gtmEvent();



// Then this snippet is run when there's a changein the url

history.listen(() => {
  // Trigger analytics events
  gtmEvent();
});

you'll find the code for each function in: https://gist.github.com/rubentd/c9dc9fe0e223fb42bbd13ee25ef32c1e