React native - objects are not valid as a React child (found: object with keys {$$typeof, type, key, ref, props, _owner, _store})

I had this problem today. I ran a diff on the source code between 5.0.3 and 5.0.4 and found that the exports have changed. I also found that if I change the import statement to the following that it works with the latest version (5.3.0):

import firebase from '@firebase/app'
import '@firebase/auth'

Doing it this way will allow you to avoid the require in the middle of your code, which is preferred imho.

Try this:

Remove the firebase import statement from App.js:

import firebase from 'firebase'

On Firebase initialization create a constant:

initializeFirebase() {
  const firebase = require("firebase");

  // Initialize Firebase
  var config = {
  ...
  };
  firebase.initializeApp(config);

  //inicializando o firestore
  const firestore = require("firebase/firestore");
  db = firebase.firestore();
  db.settings({ timestampsInSnapshots: true });
}

componentWillMount() {
  this.initializeFirebase();
...
}

To me this workaround works very well!

It's an issue with firebase version 5.0.6 whereas downgrading to a version will resolve this issue.for example try this

$ npm install --save [email protected]

If version 5.0.4 is also not working for you than try version 4.9.1 as this is what i am using and it resolved this issue for me

$npm install --save [email protected]