native-app/apps/mobile/app/_layout.tsx

/* eslint-disable global-require */
import FontAwesome from '@expo/vector-icons/FontAwesome';
import {
  DarkTheme,
  DefaultTheme,
  ThemeProvider,
} from '@react-navigation/native';
import { useFonts } from 'expo-font';
import { SplashScreen, Stack } from 'expo-router';
import { useEffect } from 'react';
import { useColorScheme } from 'react-native';

import Colors from '@/constants/Colors';

import './styles/global.css';

export {
  // Catch any errors thrown by the Layout component.
  ErrorBoundary,
} from 'expo-router';

// eslint-disable-next-line camelcase
export const unstable_settings = {
  // Ensure that reloading on `/modal` keeps a back button present.
  initialRouteName: '(tabs)/index',
};

// Prevent the splash screen from auto-hiding before asset loading is complete.
SplashScreen.preventAutoHideAsync();

export default function RootLayout() {
  const [loaded, error] = useFonts({
    OpenSansRegular: require('../assets/fonts/OpenSans-Regular.ttf'),
    OpenSansLight: require('../assets/fonts/OpenSans-Light.ttf'),
    OpenSansMedium: require('../assets/fonts/OpenSans-Medium.ttf'),
    OpenSansBold: require('../assets/fonts/OpenSans-Bold.ttf'),
    OpenSansSemiBold: require('../assets/fonts/OpenSans-SemiBold.ttf'),
    OpenSansExtra: require('../assets/fonts/OpenSans-ExtraBold.ttf'),
    ...FontAwesome.font,
  });

  // Expo Router uses Error Boundaries to catch errors in the navigation tree.
  useEffect(() => {
    if (error) throw error;
  }, [error]);

  useEffect(() => {
    if (loaded) {
      SplashScreen.hideAsync();
    }
  }, [loaded]);

  if (!loaded) {
    return null;
  }

  return <RootLayoutNav />;
}

function RootLayoutNav() {
  const colorScheme = useColorScheme();

  return (
    <ThemeProvider value={colorScheme === 'dark' ? DarkTheme : DefaultTheme}>
      <Stack
        screenOptions={{
          gestureEnabled: true,
          headerShown: false,
          contentStyle: {
            backgroundColor: Colors.background,
          },
        }}
      >
        <Stack.Screen name="(tabs)" options={{ headerShown: false }} />
      </Stack>
    </ThemeProvider>
  );
}