auth firebase back generate token

const { app, BrowserWindow } = require('electron')

const firebase = require('firebase');

const firebaseConfig = { ... };

const firebaseToken = '...';

const fbApp = firebase.initializeApp(firebaseConfig);
const auth = fbApp.auth();
const db = fbApp.firestore();

const updateMyDoc = (fields) => {
  return new Promise(async (resolve, reject) => {
    try {
      if (!auth.currentUser) {
        throw new Error('Unable to update user roster, not logged in?');
      }

      const userID = auth.currentUser.uid;
      await db.doc(`tests/${userID}`).update(fields);
      resolve();
    } catch (error) {
      reject(error);
    }
  });
}

const firebaseTest = async () => {
  try {
    await auth.signInWithCustomToken(firebaseToken);
    console.log('all good, trying to write...');
    await updateMyDoc({ 'key2': 'value2' });
    await auth.signOut();
  } catch (error) {
    console.error('Something went wrong:', error);
  }
};

app.on('ready', firebaseTest);