zustand: 状态管理

import { create } from 'zustand'

type State = {
  count: number
}

type Actions = {
  increment: (qty: number) => void
  decrement: (qty: number) => void
}

const useStore = create<State & Actions>((set) => ({
  count: 0,
  increment: (qty: number) => set((state) => ({ count: state.count + qty })),
  decrement: (qty: number) => set((state) => ({ count: state.count - qty })),
}))

export default useStore;

# 这种方法，实现的 value1/value2/value3 实际上都是方法
# 可以看这个: https://medium.com/@yasintz/introducing-zustand-computed-state-48bef413c2ec
const [useStore] = create((set, get) => {
    value: 30,
    value1: get().value + 60,
    value2: get().value1 / 4,
    value3: get().value2 * 1000
})

import { create } from 'zustand'
import { createBearSlice } from './bearSlice'
import { createFishSlice } from './fishSlice'
import { persist } from 'zustand/middleware'

export const useBoundStore = create(
  persist(
    (...a) => ({
      ...createBearSlice(...a),
      ...createFishSlice(...a),
    }),
    { name: 'bound-store' },
  ),
)

import { create } from 'zustand'
import { useShallow } from 'zustand/react/shallow'

const useMeals = create(() => ({
  papaBear: 'large porridge-pot',
  mamaBear: 'middle-size porridge pot',
  littleBear: 'A little, small, wee pot',
}))

export const BearNames = () => {
  const names = useMeals(useShallow((state) => Object.keys(state)))

  return <div>{names.join(', ')}</div>
}

import { create } from 'zustand'

// define types for state values and actions separately
type State = {
  salmon: number
  tuna: number
}

type Actions = {
  addSalmon: (qty: number) => void
  addTuna: (qty: number) => void
  reset: () => void
}

// define the initial state
const initialState: State = {
  salmon: 0,
  tuna: 0,
}

// create store
const useSlice = create<State & Actions>()((set, get) => ({
  ...initialState,
  addSalmon: (qty: number) => {
    set({ salmon: get().salmon + qty })
  },
  addTuna: (qty: number) => {
    set({ tuna: get().tuna + qty })
  },
  reset: () => {
    set(initialState)
  },
}))