Navigator.ts

// ... below const HomeStack = createStackNavigator(...

HomeStack.navigationOptions = {
  tabBarLabel: "Home",
  tabBarIcon: ({ tintColor }: TabScene) => (
    <Icon name="ios-home" type="ionicon" color={tintColor} />
  ),
  drawerLabel: "Home",
  drawerIcon: ({ tintColor }: TabScene) => <Icon name="md-home" type="ionicon" color={tintColor} />
};

const SettingsStack = createStackNavigator({ SettingsScreen });

SettingsStack.navigationOptions = {
  tabBarLabel: "Settings",
  tabBarIcon: ({ tintColor }: TabScene) => <Icon name="ios-cog" type="ionicon" color={tintColor} />,
  drawerLabel: "Settings",
  drawerIcon: ({ tintColor }: TabScene) => <Icon name="md-cog" type="ionicon" color={tintColor} />
};

// ... rest of the navigators