ReactNative Firebase Application : Firebase App named ‘[DEFAULT]’ already exists (app/duplicate-app)
http://knowledge-cess.com/reactnative-firebase-application-firebase-app-named-default-already-exists-app-duplicate-app/
If by change you are getting following exception
Firebase App named ‘[DEFAULT]’ already exists (app/duplicate-app)
Then do the following fix :
Check whether firebase is already initialised or not before calling firebase.initializeApp
if (!firebase.apps.length) { firebase.initializeApp(firebaseConfig); }