export const UnauthNavigator = StackNavigator({
  Splash: {
    screen: SplashScreen,
    navigationOptions: {
      header: null,
    },
  },
  SignIn: {
    screen: SignInScreen,
    navigationOptions: (props) => ({
      title: 'Đăng nhập',
    }),
  },
}, {
  cardStyle: {
    backgroundColor: '#fff',
  },
  navigationOptions,
  mode: 'modal',
});
navigateOnce(UnauthNavigator);