React Native State Management Skill

Learn production-ready state management including Redux Toolkit, Zustand, TanStack Query, and persistence with AsyncStorage/MMKV.

Prerequisites

• React Native basics
• TypeScript fundamentals
• Understanding of React hooks

Learning Objectives

After completing this skill, you will be able to:

• Set up Redux Toolkit with TypeScript
• Create Zustand stores with persistence
• Manage server state with TanStack Query
• Persist data with AsyncStorage/MMKV
• Choose the right solution for each use case

---

Topics Covered

1. Redux Toolkit Setup

// store/index.ts
import { configureStore } from '@reduxjs/toolkit';
import { authSlice } from './slices/authSlice';

export const store = configureStore({
  reducer: {
    auth: authSlice.reducer,
  },
});

export type RootState = ReturnType<typeof store.getState>;
export type AppDispatch = typeof store.dispatch;

2. RTK Slice

import { createSlice, PayloadAction } from '@reduxjs/toolkit';

interface AuthState {
  user: User | null;
  token: string | null;
}

export const authSlice = createSlice({
  name: 'auth',
  initialState: { user: null, token: null } as AuthState,
  reducers: {
    setUser: (state, action: PayloadAction<User>) => {
      state.user = action.payload;
    },
    logout: (state) => {
      state.user = null;
      state.token = null;
    },
  },
});

3. Zustand Store

import { create } from 'zustand';
import { persist, createJSONStorage } from 'zustand/middleware';
import AsyncStorage from '@react-native-async-storage/async-storage';

interface AppStore {
  theme: 'light' | 'dark';
  setTheme: (theme: 'light' | 'dark') => void;
}

export const useAppStore = create<AppStore>()(
  persist(
    (set) => ({
      theme: 'light',
      setTheme: (theme) => set({ theme }),
    }),
    {
      name: 'app-storage',
      storage: createJSONStorage(() => AsyncStorage),
    }
  )
);

4. TanStack Query

import { useQuery, useMutation } from '@tanstack/react-query';

export function useProducts() {
  return useQuery({
    queryKey: ['products'],
    queryFn: () => api.getProducts(),
    staleTime: 1000 * 60 * 5, // 5 minutes
  });
}

export function useCreateProduct() {
  const queryClient = useQueryClient();

  return useMutation({
    mutationFn: api.createProduct,
    onSuccess: () => {
      queryClient.invalidateQueries({ queryKey: ['products'] });
    },
  });
}

5. When to Use What

Solution	Use Case
useState/useReducer	Component-local state
Zustand	Simple global state, preferences
Redux Toolkit	Complex app state, large teams
TanStack Query	Server state, caching, sync
Context	Theme, auth status (low-frequency)

---

Quick Start Example

// Zustand + TanStack Query combo
import { create } from 'zustand';
import { useQuery } from '@tanstack/react-query';

// UI state with Zustand
const useUIStore = create((set) => ({
  sidebarOpen: false,
  toggleSidebar: () => set((s) => ({ sidebarOpen: !s.sidebarOpen })),
}));

// Server state with TanStack Query
function ProductList() {
  const { data, isLoading } = useQuery({
    queryKey: ['products'],
    queryFn: fetchProducts,
  });

  const sidebarOpen = useUIStore((s) => s.sidebarOpen);

  // Render with both states
}

---

Common Errors & Solutions

Error	Cause	Solution
"Non-serializable value"	Functions in Redux state	Use middleware ignore
State not persisting	Wrong storage config	Check persist config
Stale data	Missing invalidation	Add proper query keys

---

Validation Checklist

• State updates correctly
• Persistence works across restarts
• Server state syncs properly
• TypeScript types are correct

---

Usage

Skill("react-native-state")

Bonded Agent: 03-react-native-state