I have a mono repo project with my frontend and backend together.

I am trying to set up the Firebase emulator on both places where I do initializeApp

I suspect that setting up the emulator in both places makes them collide.

This is the frontend configuration

// Initialize Firebase
const firebaseConfig = {
  ...window.config
};

const app = firebase.initializeApp(firebaseConfig);

// Ensure no Firebase Auth calls are made before configuring the emulator
if (window.env === "emulator") {
  // Set the auth emulator BEFORE any auth calls are made
  firebase.auth().useEmulator("http://127.0.0.1:9099", { disableWarnings: true });

  // Set the Firestore emulator
  firebase.firestore().useEmulator("localhost", 8080);
}

// Now that the emulator is set, you can safely use the Firebase Auth instance
const auth = firebase.auth();

// Set up other authentication methods
const signInAnonymously = firebase;

If I don’t run my backend everything works fine, and the part of my app that uses the frontend firebase does work perfectly.

This is the set up for the backend:

  const adminDB = require("firebase-admin");
  // Initialize the Firebase Admin SDK
  adminDB.initializeApp({
    credential: adminDB.credential.cert(serviceAccount),
    databaseURL: config.firebaseConfig.databaseURL,
    databaseAuthVariableOverride: {
      uid: "service" // indicates that this is a service account and not an actual user
    }
  });

  const firestore = adminDB.firestore();

  // Check if using Firestore emulator
  if (process.env.FIRESTORE_EMULATOR_HOST) {
    firestore.settings({
      host: process.env.FIRESTORE_EMULATOR_HOST,
      ssl: false, // Emulator does not use SSL
      experimentalForceLongPolling: true, // Force HTTP/1 instead of gRPC
      useFetchStreams: false
    });
  }

Same way, if I try one of my endpoints using postman I get fetch data from my firebase emulator.
but at the time I open my dashboard view, were multiple request both from front and back are being made, I get the following error:

“Firebase: Auth instance has already been used to make a network call. Auth can no longer be configured to use the emulator. Try calling “connectAuthEmulator()” sooner. (auth/emulator-config-failed).”

Any ideas on how to aboard this?
Thanks in advance

Be able to have the firebase emulator running with auth and firestore locally on my app