text: import React, { Component } from 'react';
  import { View, Text, StyleSheet } from 'react-native';
  import { DrawerNavigator, TabNavigator, StackNavigator } from 'react-navigation';
  import mainScreen from '../screens/fb-login/MainScreen';
  import detailScreen from '../screens/fb-login/DetailScreen';
  
  const fbStackNavigator = StackNavigator({
    Main: {
      screen: mainScreen,
    },
    Detail: {
      screen: detailScreen,
    },
  });
  
  export default fbStackNavigator;
  