text: import { StackNavigator } from 'react-navigation';
  import PostDetailsScreen from '../screens/PostDetails';
  import SocialFeedScreen from '../screens/SocialFeedScreen';
  import ProfileScreen from '../screens/ProfileScreen';
  
  export default StackNavigator ({
  
      SocialFeed:
      {
          screen: SocialFeedScreen
      },
      PostDetails:
      {
          screen: PostDetailsScreen
      },
      Profile: 
      {
          screen: ProfileScreen
      }
  
  },
  {
      initialRouteName: 'SocialFeed',
  });
  
  