I am currently dealing with two screens: Login and EmployeeList and didn't set initialRouteName.
I have combined two reducers: NavReducer and AuthReducer. I am receiving state.auth in LoginForm and state.nav in RouterWithNavigationState like so: 
class RouterWithNavigationState extends Component{
    ...
    <Router navigation = {addNavigationHelpers({
                    dispatch: this.props.dispatch,
                    state: this.props.navigation
                })} />
    ...
    }
    const mapStateToProps = state =>
    {
        console.log (state.nav)
        return 
        {
           navigation: state.nav
        } 
    }
    export default connect(mapStateToProps)(RouterWithNavigationState)
However I get an error: 
(1) mapStateToProps() in Connect(RouterWithNavigationState) must return a plain object. Instead received undefined. 
(2) addNavigationHelpers is not a function 
The log statement prints the initial state I defined in NavReducer.js like so: {index: 0, routes: Array(1)}
package.json: 
"dependencies": {
    "firebase": "^4.13.1",
    "react": "16.3.1",
    "react-native": "0.55.3",
    "react-navigation": "^2.0.1",
    "react-redux": "^5.0.7",
    "redux": "^4.0.0",
    "redux-thunk": "^2.2.0"
  },
  "devDependencies": {
    "babel-jest": "22.4.3",
    "babel-preset-react-native": "4.0.0",
    "jest": "22.4.3",
    "react-test-renderer": "16.3.1"
  }
What am I missing?
