How to add additional information to firebase.auth()

As far as I know, you have to manage the users profiles by yourself if you want to have more fields than the default user provided by Firebase.

You can do this creating a reference in Firebase to keep all the users profiles.

users: {
  "userID1": {
    "name":"user 1",
    "gender": "male" 
  },
  "userID2": {
    "name":"user 2",
    "gender": "female" 
  }
}

You can use onAuthStateChanged to detect when the user is logged in, and if it is you can use once() to retrieve user's data

firebaseRef.child('users').child(user.uid).once('value', callback)

Hope it helps

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