text: import { createStackNavigator, createAppContainer } from 'react-navigation';
  
  import Launch from '../screens/Launch';
  import MainHome from './TabNavigationStack';
  
  const RNApp = createStackNavigator(
    {
      Launch: { screen: Launch },
      MainHome: MainHome
    },
    {
      initialRouteName: 'Launch',
      defaultNavigationOptions: { header: null, gesturesEnabled: false }
    }
  );
  
  export default createAppContainer(RNApp);
  