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Specifies best practices and conventions for Expo-based mobile app development.
기본적으로 소스를 먼저 확인하는 Prompt가 선택됩니다. 직접 명령으로 전환하거나 로컬 사본을 다운로드할 수도 있습니다.
설치 여부를 결정하기 전에 SKILL.md와 SkillsMP에 표시된 보조 파일을 읽어 보세요.
Codex 또는 Claude로 설치 이 Prompt를 복사해 Codex, Claude 또는 다른 어시스턴트에 붙여 넣으면 Skill 페이지를 검토하고 설치를 진행할 수 있습니다.
직접 명령은 검토 Prompt를 거치지 않습니다. 실행하기 전에 소스를 확인하세요.
npx skills add https://github.com/oimiragieo/agent-studio --skill expo-mobile-app-rule명령은 한 줄로 유지됩니다. 복사하기 전에 가로로 스크롤해 전체 내용을 확인하세요.
로컬 사본을 원하시나요? SkillsMP에서 현재 제공할 수 있는 파일을 다운로드하세요.
SOC 직업 분류 기준
SKILL.md 표시 중
| name | expo-mobile-app-rule |
| description | Specifies best practices and conventions for Expo-based mobile app development. |
| version | 1.0.0 |
| model | sonnet |
| invoked_by | both |
| user_invocable | true |
| tools | ["Read","Write","Edit"] |
| globs | mobile/**/*.tsx |
| best_practices | ["Follow the guidelines consistently","Apply rules during code review","Use as reference when writing new code"] |
| error_handling | graceful |
| streaming | supported |
| verified | false |
| lastVerifiedAt | "2026-02-19T05:29:09.098Z" |
| source | builtin |
| trust_score | 100 |
| provenance_sha | bd10d0827cce556e |
Expo Router uses the file system for navigation:
app/
_layout.tsx # Root layout
index.tsx # Home screen (/)
(tabs)/ # Tab navigator group
_layout.tsx # Tab layout
home.tsx # /home
profile.tsx # /profile
user/
[id].tsx # Dynamic route /user/:id
modal.tsx # Can be presented as modal
// app/_layout.tsx
import { Stack } from 'expo-router';
export default function RootLayout() {
return (
<Stack>
<Stack.Screen name="(tabs)" options={{ headerShown: false }} />
<Stack.Screen
name="modal"
options={{
presentation: 'modal',
title: 'Settings',
}}
/>
</Stack>
);
}
// app/(tabs)/_layout.tsx
import { } ;
{ } ;
() {
(
);
}
import { useRouter, useLocalSearchParams, Link } from 'expo-router';
function MyComponent() {
const router = useRouter();
const params = useLocalSearchParams();
return (
<>
{/* Declarative navigation */}
<Link href="/profile">Go to Profile</Link>
<Link href={{ pathname: '/user/[id]', params: { id: '123' } }}>
View User
</Link>
{/* Imperative navigation */}
<Button onPress={() => router.push('/profile')} title="Push" />
<Button onPress={() => router.replace('/home')} title="Replace" />
<Button onPress={() => router.back()} title="Go Back" />
</>
);
}
// app/user/[id].tsx
import { useLocalSearchParams } from 'expo-router';
export default function UserScreen() {
const { id } = useLocalSearchParams<{ id: string }>();
return <Text>User ID: {id}</Text>;
}
// app/_layout.tsx
import { useAuth } from '@/hooks/useAuth';
import { Redirect, Slot } from 'expo-router';
export default function AppLayout() {
const { user, loading } = useAuth();
if (loading) {
return <LoadingScreen />;
}
if (!user) {
return <Redirect href="/login" />;
}
return <Slot />;
}
// contexts/AppContext.tsx
import { createContext, useContext, useState, ReactNode } from 'react';
interface AppState {
user: User | null;
theme: 'light' | 'dark';
setUser: (user: User | null) => void;
setTheme: (theme: 'light' | 'dark') => void;
}
const AppContext = createContext<AppState | undefined>(undefined);
export function AppProvider({ children }: { children: ReactNode }) {
const [user, setUser] = useState<User | null>(null);
const [theme, setTheme] = useState<'light' | 'dark'>('light');
return (
<AppContext.Provider value={{ user, theme, setUser, setTheme }}>
{children}
</AppContext.Provider>
);
}
export const useApp = () => {
const context = useContext(AppContext);
if (!context) {
throw new Error('useApp must be used within AppProvider');
}
return context;
};
// store/slices/userSlice.ts
import { createSlice, PayloadAction } from '@reduxjs/toolkit';
interface UserState {
currentUser: User | null;
loading: boolean;
}
const userSlice = createSlice({
name: 'user',
initialState: { currentUser: null, loading: false } as UserState,
reducers: {
setUser: (state, action: PayloadAction<User | null>) => {
state.currentUser = action.payload;
},
setLoading: (state, action: PayloadAction<boolean>) => {
state.loading = action.payload;
},
},
});
export const { setUser, setLoading } = userSlice.actions;
export default userSlice.reducer;
// store/useStore.ts
import { create } from 'zustand';
import { persist, createJSONStorage } from 'zustand/middleware';
import AsyncStorage from '@react-native-async-storage/async-storage';
interface AppStore {
user: User | null;
theme: 'light' | 'dark';
setUser: (user: User | null) => void;
toggleTheme: () => void;
}
export const useStore = create<AppStore>()(
persist(
set => ({
user: null,
theme: 'light',
setUser: user => set({ user }),
toggleTheme: () =>
set(state => ({
theme: state.theme === 'light' ? 'dark' : 'light',
})),
}),
{
name: 'app-storage',
storage: createJSONStorage(() => AsyncStorage),
}
)
);
import AsyncStorage from '@react-native-async-storage/async-storage';
// Save data
await AsyncStorage.setItem('user', JSON.stringify(user));
// Load data
const userData = await AsyncStorage.getItem('user');
const user = userData ? JSON.parse(userData) : null;
// Remove data
await AsyncStorage.removeItem('user');
// Clear all
await AsyncStorage.clear();
import * as SQLite from 'expo-sqlite';
class DatabaseService {
private db: SQLite.SQLiteDatabase | null = null;
async init() {
this.db = await SQLite.openDatabaseAsync('myapp.db');
await this.db.execAsync(`
CREATE TABLE IF NOT EXISTS messages (
id INTEGER PRIMARY KEY AUTOINCREMENT,
text TEXT NOT NULL,
timestamp INTEGER,
synced INTEGER DEFAULT 0
);
`);
}
async saveMessage(text: string) {
await this.db?.runAsync(
'INSERT INTO messages (text, timestamp) VALUES (?, ?)',
text,
Date.now()
);
}
async getUnsynced() {
return await this.db?.getAllAsync('SELECT * FROM messages WHERE synced = 0');
}
async markSynced(id: number) {
await this.db?.runAsync('UPDATE messages SET synced = 1 WHERE id = ?', id);
}
}
import NetInfo from '@react-native-community/netinfo';
import { useEffect, useState } from 'react';
function useOnlineStatus() {
const [isOnline, setIsOnline] = useState(true);
useEffect(() => {
const unsubscribe = NetInfo.addEventListener((state) => {
setIsOnline(state.isConnected ?? false);
});
return () => unsubscribe();
}, []);
return isOnline;
}
// Usage
function MyScreen() {
const isOnline = useOnlineStatus();
return (
<View>
{!isOnline && <Banner message="You are offline" />}
{/* Rest of content */}
</View>
);
}
import { useQuery, useMutation, useQueryClient } from '@tanstack/react-query';
function useOfflineData() {
const queryClient = useQueryClient();
const isOnline = useOnlineStatus();
const { data } = useQuery({
queryKey: ['items'],
queryFn: fetchItems,
enabled: isOnline,
// Use cached data when offline
staleTime: Infinity,
});
const mutation = useMutation({
mutationFn: createItem,
onMutate: async newItem => {
// Optimistic update
await queryClient.cancelQueries({ queryKey: ['items'] });
const previous = queryClient.getQueryData(['items']);
queryClient.setQueryData(['items'], (old: any) => [...old, newItem]);
// Save to local storage if offline
if (!isOnline) {
await saveToQueue(newItem);
}
return { previous };
},
onError: (err, newItem, context) => {
// Rollback on error
queryClient.setQueryData(['items'], context?.previous);
},
});
// Sync queue when online
useEffect(() => {
if (isOnline) {
syncQueue();
}
}, [isOnline]);
return { data, mutation };
}
import * as Notifications from 'expo-notifications';
import * as Device from 'expo-device';
import Constants from 'expo-constants';
import { Platform } from 'react-native';
// Configure notification handler
Notifications.setNotificationHandler({
handleNotification: async () => ({
shouldShowAlert: true,
shouldPlaySound: true,
shouldSetBadge: true,
}),
});
async function registerForPushNotifications() {
if (!Device.isDevice) {
alert('Push notifications only work on physical devices');
return;
}
const { status: existingStatus } = await Notifications.getPermissionsAsync();
let finalStatus = existingStatus;
if (existingStatus !== 'granted') {
const { status } = await Notifications.requestPermissionsAsync();
finalStatus = status;
}
if (finalStatus !== 'granted') {
return;
}
const projectId = Constants.expoConfig?.extra?.eas?.projectId;
const token = await Notifications.getExpoPushTokenAsync({ projectId });
// Send token to your backend
await sendTokenToBackend(token.data);
// Android-specific channel setup
if (Platform.OS === 'android') {
Notifications.setNotificationChannelAsync('default', {
name: 'default',
importance: Notifications.AndroidImportance.MAX,
vibrationPattern: [0, 250, 250, 250],
lightColor: '#FF231F7C',
});
}
return token.data;
}
import { useEffect, useRef } from 'react';
function useNotifications() {
const notificationListener = useRef<Notifications.Subscription>();
const responseListener = useRef<Notifications.Subscription>();
useEffect(() => {
// Foreground notification handler
notificationListener.current = Notifications.addNotificationReceivedListener(notification => {
console.log('Notification received:', notification);
});
// User interaction handler
responseListener.current = Notifications.addNotificationResponseReceivedListener(response => {
const data = response.notification.request.content.data;
// Navigate based on notification data
if (data.screen) {
router.push(data.screen as any);
}
});
return () => {
if (notificationListener.current) {
Notifications.removeNotificationSubscription(notificationListener.current);
}
if (responseListener.current) {
Notifications.removeNotificationSubscription(responseListener.current);
}
};
}, []);
}
async function scheduleNotification() {
await Notifications.scheduleNotificationAsync({
content: {
title: 'Reminder',
body: 'Time to check your tasks!',
data: { screen: '/tasks' },
},
trigger: {
seconds: 60,
// Or use specific date
// date: new Date(Date.now() + 60 * 60 * 1000),
// Or repeating
// repeats: true,
},
});
}
// Cancel notification
const identifier = await scheduleNotification();
await Notifications.cancelScheduledNotificationAsync(identifier);
// Cancel all
await Notifications.cancelAllScheduledNotificationsAsync();
// app.json
{
"expo": {
"scheme": "myapp",
"ios": {
"associatedDomains": ["applinks:myapp.com"]
},
"android": {
"intentFilters": [
{
"action": "VIEW",
"autoVerify": true,
"data": [
{
"scheme": "https",
"host": "myapp.com"
}
],
"category": ["BROWSABLE", "DEFAULT"]
}
]
}
}
}
// Expo Router handles deep links automatically
// myapp://user/123 -> app/user/[id].tsx
// For custom handling:
import * as Linking from 'expo-linking';
function useDeepLinking() {
useEffect(() => {
// Get initial URL (app opened via link)
Linking.getInitialURL().then(url => {
if (url) {
handleDeepLink(url);
}
});
// Listen for URL changes (app already open)
const subscription = Linking.addEventListener('url', ({ url }) => {
handleDeepLink(url);
});
return () => subscription.remove();
}, []);
}
function handleDeepLink(url: string) {
const { path, queryParams } = Linking.parse(url);
// Navigate based on path
if (path === 'user') {
router.push(`/user/${queryParams?.id}`);
}
}
// apple-app-site-association (serve at https://myapp.com/.well-known/)
{
"applinks": {
"apps": [],
"details": [
{
"appID": "TEAMID.com.company.myapp",
"paths": ["/user/*", "/post/*"]
}
]
}
}
// assetlinks.json (serve at https://myapp.com/.well-known/)
[
{
"relation": ["delegate_permission/common.handle_all_urls"],
"target": {
"namespace": "android_app",
"package_name": "com.company.myapp",
"sha256_cert_fingerprints": ["FINGERPRINT"]
}
}
]
// When sending push notification from backend
{
"to": "ExponentPushToken[xxx]",
"title": "New Message",
"body": "You have a new message",
"data": {
"url": "myapp://chat/123"
}
}
// Handle in app
responseListener.current =
Notifications.addNotificationResponseReceivedListener((response) => {
const url = response.notification.request.content.data.url;
if (url) {
Linking.openURL(url);
}
});
import { memo, useMemo, useCallback } from 'react';
const ListItem = memo(({ item, onPress }: Props) => (
<TouchableOpacity onPress={() => onPress(item.id)}>
<Text>{item.title}</Text>
</TouchableOpacity>
));
function MyList({ items }: Props) {
const sortedItems = useMemo(
() => items.sort((a, b) => a.title.localeCompare(b.title)),
[items]
);
const handlePress = useCallback((id: string) => {
router.push(`/item/${id}`);
}, []);
return (
<FlatList
data={sortedItems}
renderItem={({ item }) => (
<ListItem item={item} onPress={handlePress} />
)}
keyExtractor={(item) => item.id}
/>
);
}
import { FlashList } from '@shopify/flash-list';
<FlashList
data={items}
renderItem={({ item }) => <ItemCard item={item} />}
estimatedItemSize={100}
// Much faster than FlatList for large lists
/>
import { Image } from 'expo-image';
<Image
source={{ uri: 'https://example.com/large-image.jpg' }}
placeholder={require('./placeholder.png')}
contentFit="cover"
transition={200}
cachePolicy="memory-disk"
style={{ width: 300, height: 200 }}
/>
Before starting:
cat .claude/context/memory/learnings.md
After completing: Record any new patterns or exceptions discovered.
ASSUME INTERRUPTION: Your context may reset. If it's not in memory, it didn't happen.