Navigator.ts

// ... amend this code to the HomeStack's navigationOptions
HomeStack.navigationOptions = ({ navigation }: NavigationScreenProps) => {
  let drawerLockMode = "unlocked";
  if (navigation.state.index > 0) {
    drawerLockMode = "locked-closed";
  }

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

// ... rest of Navigator.ts