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redux toolkit 설치

npm install @reduxjs/toolkit react-redux

store.ts

import { configureStore } from '@reduxjs/toolkit'
import counterReducer from '../features/counter/counterSlice'

export const store = configureStore({
  reducer: {
    counter: counterReducer,
  },
})

// Infer the `RootState` and `AppDispatch` types from the store itself
export type RootState = ReturnType<typeof store.getState>
// Inferred type: {posts: PostsState, comments: CommentsState, users: UsersState}
export type AppDispatch = typeof store.dispatch

리덕스 객체 생성 및 슬라이스 등록

index.tsx

import React from 'react'
import ReactDOM from 'react-dom'
import './index.css'
import App from './App'
import { store } from './app/store'
import { Provider } from 'react-redux'

ReactDOM.render(
  <Provider store={store}>
    <App />
  </Provider>,
  document.getElementById('root')
)

서드파트에서 사용할 수 있게 Proivder 제공

counter/counter-slice.ts

import { createSlice } from '@reduxjs/toolkit'
import type { PayloadAction } from '@reduxjs/toolkit'

export interface CounterState {
  value: number
}

const initialState: CounterState = {
  value: 0,
}

export const counterSlice = createSlice({
  name: 'counter',
  initialState,
  reducers: {
    increment: (state) => {
      // Redux Toolkit allows us to write "mutating" logic in reducers. It
      // doesn't actually mutate the state because it uses the Immer library,
      // which detects changes to a "draft state" and produces a brand new
      // immutable state based off those changes
      state.value += 1
    },
    decrement: (state) => {
      state.value -= 1
    },
    incrementByAmount: (state, action: PayloadAction<number>) => {
      state.value += action.payload
    },
  },
})

// Action creators are generated for each case reducer function
export const { increment, decrement, incrementByAmount } = counterSlice.actions

export default counterSlice.reducer

전역값 저장을 위한 Reducer 생성

counter.tsx

import React from 'react'
import type { RootState } from '../../app/store'
import { useSelector, useDispatch } from 'react-redux'
import { decrement, increment } from './counterSlice'

export function Counter() {
  const count = useSelector((state: RootState) => state.counter.value)
  const dispatch = useAppDispatch();

  return (
    <div>
      <div>
        <button
          aria-label="Increment value"
          onClick={() => dispatch(increment())}
        >
          Increment
        </button>
        <span>{count}</span>
        <button
          aria-label="Decrement value"
          onClick={() => dispatch(counterSlice.actions.decrement())}
        >
          Decrement
        </button>
      </div>
    </div>
  )
}

useSelector를 통해 전역으로 관리되는 상태값 가져오기

dispatch를 통해 slice에 선언한 reducer 호출로 전역 상태값 저장하기

Redux Toolkit 사용 단계

1. Redux Proivder
2. Redux 객체 생성
3. Slice 생성 (Reducer 전역값 저장)
4. Slice Redux 객체에서 사용할 수 있게 등록
5. tsx에서 useSelector나 Dispatch로 값을 가져오거나 전역값 저장