[React] 🧸Zustand 사용법 (ft. storage)

▷ Zustand

🧸 설치

# 설치
npm i zustand

🧸 useCountStore

src/store/useCountStore.ts

import { create } from 'zustand'

interface CountState {
  count: number;
  increasePopulation: () => void;
  removeAll: () => void;
}

const useCountStore = create<CountState>(set => ({
  count: 0,
  increase: () => set((state) => ({ count: state.count + 1 })),
  removeAll: () => set({ count: 0 }),
}))

export default useCountStore

🧸 useCountStore 불러와서 사용하기

src/pages/MainPage.tsx

import useCountStore from "../store/useCountStore"; 

function MainPage() {
  const { count, increase, removeAll } = useCountStore((state) => state)

  return (
    <>
      <h2>{count}</h2>
      <button onClick={increase}>one up</button>
      <button onClick={removeAll}>remove all</button>
    </>
  )
}

export default MainPage;

🧸 storage에 상태를 저장

zustand-persist

import { create, StateCreator } from 'zustand'
import { persist, createJSONStorage } from 'zustand/middleware'

interface CountState {
  count: number;
  increasePopulation: () => void;
  removeAll: () => void;
}

const useCountStore : StateCreator<CountState> = (set) => ({
  count: 0,
  increase: () => set((state) => ({ count: state.count + 1 })),
  removeAll: () => set({ count: 0 }),
});

const persistedUseCountStore = persist<CountState>(
  useCountStore,
  {
    name: 'countStore',
    storage: createJSONStorage(() => sessionStorage), // session 사용
  },
);

export default create(persistedUseCountStore);

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