text: import {createAppContainer} from 'react-navigation';
  import {createStackNavigator} from 'react-navigation-stack';
  // import {createDrawerNavigator} from 'react-navigation-drawer';
  // import {createBottomTabNavigator} from 'react-navigation-tabs';
  
  import HomeScreen from '../screens/HomeScreen';
  import HeartScreen from '../screens/HeartScreen';
  import Colors from '../constants/Colors';
  
  const AppNavigator = createStackNavigator({
    Home: {
      screen: HomeScreen,
      navigationOptions: {
        headerStyle: {
          backgroundColor: Colors.header,
          shadowColor: Colors.header,
        },
        headerTitleStyle: {
          color: 'white',
        },
      },
    },
    Heart: {
      screen: HeartScreen,
      navigationOptions: {
        headerTintColor: Colors.primary,
        headerTruncatedBackTitle: '',
        headerBackTitle: '',
        headerStyle: {
          backgroundColor: Colors.header,
          shadowColor: Colors.header,
        },
        headerTitleStyle: {
          color: 'white',
        },
        headerBackTitleStyle: {
          color: 'white',
        },
      },
    },
  });
  
  export default createAppContainer(AppNavigator);
  