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// In _app.js or layout if (typeof window === 'undefined') // Server-side: fresh store per request useStore.setState( bears: 0 )

// store/slices/userSlice.js export const createUserSlice = (set) => ( user: null, setUser: (user) => set( user ), ) // store/slices/cartSlice.js export const createCartSlice = (set) => ( cartItems: [], addToCart: (item) => set((state) => ( cartItems: [...state.cartItems, item] )) ) zust4help full

For React integration: