app.js

import { createAppContainer, createSwitchNavigator } from "react-navigation";
import { createStackNavigator } from "react-navigation-stack";

import HomeScreen from "./screens/HomeScreen";
import LoadingScreen from "./screens/LoadingScreen";
import LoginScreen from "./screens/LoginScreen";
import RegisterScreen from "./screens/RegisterScreen"

import * as firebase  from "firebase"

var firebaseConfig = {
  apiKey: "AIzaSyA0TvK_oL2oOyflaJqMSlMO6pWg41IInh8",
  authDomain: "socialapp-7479e.firebaseapp.com",
  databaseURL: "https://socialapp-7479e.firebaseio.com",
  projectId: "socialapp-7479e",
  storageBucket: "socialapp-7479e.appspot.com",
  messagingSenderId: "497760801065",
  appId: "1:497760801065:web:7c330d4944658bbe2be738"
};
// Initialize Firebase
firebase.initializeApp(firebaseConfig);


const AppStack = createStackNavigator ({
  Home: HomeScreen
});

const AuthStack = createStackNavigator ({
  Login: LoginScreen,
  Register: RegisterScreen,
})

export default createAppContainer(
  createSwitchNavigator(
    {
      Loading: LoadingScreen,
      App: AppStack,
      Auth: AuthStack
    },
    {
      initialRouteName: "Loading"
    }
  )
)