useEffect(() => const unsubscribe = useStore.subscribe( (state) => state.someValue, (value) => console.log(value) ) return unsubscribe , [])
) ) import produce from 'immer' import create from 'zustand' import immer from 'zustand/middleware/immer' const useStore = create( immer((set) => ( todos: [], addTodo: (text) => set((state) => state.todos.push( text, done: false ) ), toggleTodo: (index) => set((state) => state.todos[index].done = !state.todos[index].done ), )) ) 3. Devtools (Redux DevTools integration) import devtools from 'zustand/middleware' const useStore = create( devtools( (set) => ( count: 0, increment: () => set((state) => ( count: state.count + 1 ), false, 'increment'), ), name: 'MyAppStore' ) ) 4. Combining Multiple Middlewares import create from 'zustand' import persist, devtools, immer from 'zustand/middleware' const useStore = create( devtools( persist( immer((set) => ( user: null, login: (userData) => set((state) => state.user = userData ), )), name: 'user-storage' ), name: 'UserStore' ) ) Part 4: Performance Optimizations (Full Help) 1. Automatic Selector Memoization // Good: only re-renders when bears changes const bears = useBearStore((state) => state.bears) // Bad: re-renders on every state change const bears, fish = useBearStore() 2. Using shallow for Nested Objects import shallow from 'zustand/shallow' // Without shallow – re-renders if any property changes const name, age = usePersonStore((state) => ( name: state.name, age: state.age ), shallow) // shallow prevents unnecessary re-renders 3. Creating Custom Hooks per Slice const useStore = create((set) => ( user: name: 'John', age: 30 , posts: [], comments: [] )) // Custom selectors const useUserName = () => useStore((state) => state.user.name) const useUserAge = () => useStore((state) => state.user.age) 4. Preventing Re-renders with useRef import useRef from 'react' import useStore from './store' function Component() // This won't cause re-renders const storeRef = useRef(useStore.getState()) zust4help full
If you searched for "zust4help full" , you likely want —from basic stores to advanced middleware and best practices. This article is that resource. useEffect(() => const unsubscribe = useStore
For React integration:
const useStore = create((...args) => ( ...createUserSlice(...args), ...createCartSlice(...args) )) Zustand’s true strength comes from its middleware ecosystem. 1. Persist Middleware (localStorage) import create from 'zustand' import persist, createJSONStorage from 'zustand/middleware' const useStore = create( persist( (set) => ( theme: 'light', setTheme: (theme) => set( theme ), ), Automatic Selector Memoization // Good: only re-renders when
const useTodoStore = create((set) => ( todos: [], fetchTodos: async () => const response = await fetch('https://jsonplaceholder.typicode.com/todos') const data = await response.json() set( todos: data ) , addTodo: (title) => set((state) => ( todos: [...state.todos, id: Date.now(), title, completed: false ] )) )) For large apps, split your store:
import useStore from 'zustand' import store from './vanilla-store' function Counter() const count = useStore(store, (state) => state.count) const increment = useStore(store, (state) => state.increment) return <button onClick=increment>count</button>