supabase/examples/auth/expo-social-auth/app/_layout.tsx

import { DarkTheme, DefaultTheme, ThemeProvider } from '@react-navigation/native';
import { useFonts } from 'expo-font';
import { Stack } from 'expo-router';
import { StatusBar } from 'expo-status-bar';
import 'react-native-reanimated';

import { SplashScreenController } from '@/components/splash-screen-controller';

import { useAuthContext } from '@/hooks/use-auth-context';
import { useColorScheme } from '@/hooks/use-color-scheme';
import AuthProvider from '@/providers/auth-provider';

// Separate RootNavigator so we can access the AuthContext
function RootNavigator() {
  const { isLoggedIn } = useAuthContext();

  return (
    <Stack>
      <Stack.Protected guard={isLoggedIn}>
        <Stack.Screen name="(tabs)" options={{ headerShown: false }} />
      </Stack.Protected>
      <Stack.Protected guard={!isLoggedIn}>
        <Stack.Screen name="login" options={{ headerShown: false }} />
      </Stack.Protected>
      <Stack.Screen name="+not-found" />
    </Stack>
  );
}

export default function RootLayout() {
  const colorScheme = useColorScheme();

  const [loaded] = useFonts({
    SpaceMono: require('../assets/fonts/SpaceMono-Regular.ttf'),
  });

  if (!loaded) {
    // Async font loading only occurs in development.
    return null;
  }

  return (
    <ThemeProvider value={colorScheme === 'dark' ? DarkTheme : DefaultTheme}>
      <AuthProvider>
        <SplashScreenController />
        <RootNavigator />
        <StatusBar style="auto" />
      </AuthProvider>
    </ThemeProvider>
  );
}