Server-side gtm with Firebase es6 modules

// app/javascript/initialize.js
import { initializeApp } from "firebase/app";

const firebaseConfig = {
  apiKey: "",
  authDomain: "foo-bar.firebaseapp.com",
  projectId: "foo-bar",
  storageBucket: "foo-bar.appspot.com",
  appId: "foo:web",
  measurementId: "G-firebase-web-data-stream"
};

const firebaseInit = () => {
  return initializeApp(firebaseConfig);
}

export {firebaseInit}

// app/javascript/application.js
import { getAnalytics } from "firebase/analytics";
import { firebaseInit } from "initialize";


const firebaseApp = firebaseInit()
const analytics = getAnalytics(firebaseApp, {debug_mode: true, transport_url: 'https://custom.tld.com'});
export {  analytics };