import { createStackNavigator } from "@react-navigation/stack";
const Stack = createStackNavigator();
export default function App() {
  return (
    <NavigationContainer>
      <Stack.Navigator>
        <Stack.Screen name="Home" component={HomeScreen} />
      </Stack.Navigator>
    </NavigationContainer>
  );
}

app/
  _layout.tsx
  index.tsx
  settings.tsx

// Each screen manually defines its own layout

// app/_layout.tsx
import { Stack } from "expo-router";
export default function RootLayout() {
  return <Stack />;
}

expo build:ios
expo build:android

eas build --platform ios
eas build --platform android

undefined

**Correct:**

```ts
// app.config.ts
import { ConfigPlugin } from "expo/config-plugins";
const withMyApiKey: ConfigPlugin<{ apiKey: string }> = (config, { apiKey }) => {
  config = withInfoPlist(config, (c) => {
    c.modResults["MY_API_KEY"] = apiKey;
    return c;
  });
  return config;
};
export default {
  plugins: [["withMyApiKey", { apiKey: process.env.API_KEY }]],
};

if (Platform.OS === "ios") {
  return <IOSComponent />;
}
return <AndroidComponent />;

MyComponent.ios.tsx
MyComponent.android.tsx

import { Platform } from "react-native";
const styles = StyleSheet.create({
  container: Platform.select({
    ios: { paddingTop: 20 },
    android: { paddingTop: 0 },
  }),
});

import { Image } from "react-native";
<Image source={{ uri: url }} style={styles.image} />;

import { Image } from "expo-image";
<Image source={url} contentFit="cover" style={styles.image} />;

undefined

**Correct:**

```tsx
import * as Font from "expo-font";
await Font.loadAsync({
  CustomFont: require("./assets/fonts/CustomFont.ttf"),
});

import AsyncStorage from "@react-native-async-storage/async-storage";
await AsyncStorage.setItem("authToken", token);

import * as SecureStore from "expo-secure-store";
await SecureStore.setItemAsync("authToken", token);

// Manual Firebase/APNs setup, native configuration

import * as Notifications from "expo-notifications";
const token = await Notifications.getExpoPushTokenAsync();

undefined

**Correct:**

```json
{
  "expo": {
    "name": "MyApp",
    "slug": "my-app",
    "plugins": ["expo-router"]
  }
}

import codePush from "react-native-code-push";
export default codePush(MyApp);

import * as Updates from "expo-updates";
await Updates.checkForUpdateAsync();

router.push("/profile");

import { router } from "expo-router";
router.push({ pathname: "/profile/[id]", params: { id: userId } });