自动生成选择器

我们建议在使用存储的属性或操作时使用选择器。你可以像这样从存储中获取值：

const bears = useBearStore((state) => state.bears)

然而，编写这些可能会很繁琐。如果你也这么觉得，你可以自动生成你的选择器。

创建以下函数：createSelectors

import { StoreApi, UseBoundStore } from 'zustand'

type WithSelectors<S> = S extends { getState: () => infer T }
  ? S & { use: { [K in keyof T]: () => T[K] } }
  : never

const createSelectors = <S extends UseBoundStore<StoreApi<object>>>(
  _store: S,
) => {
  let store = _store as WithSelectors<typeof _store>
  store.use = {}
  for (let k of Object.keys(store.getState())) {
    ;(store.use as any)[k] = () => store((s) => s[k as keyof typeof s])
  }

  return store
}

如果你有一个像这样的存储：

interface BearState {
  bears: number
  increase: (by: number) => void
  increment: () => void
}

const useBearStoreBase = create<BearState>()((set) => ({
  bears: 0,
  increase: (by) => set((state) => ({ bears: state.bears + by })),
  increment: () => set((state) => ({ bears: state.bears + 1 })),
}))

将该函数应用到你的存储：

const useBearStore = createSelectors(useBearStoreBase)

现在选择器是自动生成的，你可以直接访问它们：

// 获取属性
const bears = useBearStore.use.bears()

// 获取操作
const increment = useBearStore.use.increment()

Vanilla Store

如果你使用的是 vanilla store，使用以下的 createSelectors 函数：

import { StoreApi, useStore } from 'zustand'

type WithSelectors<S> = S extends { getState: () => infer T }
  ? S & { use: { [K in keyof T]: () => T[K] } }
  : never

const createSelectors = <S extends StoreApi<object>>(_store: S) => {
  const store = _store as WithSelectors<typeof _store>
  store.use = {}
  for (const k of Object.keys(store.getState())) {
    ;(store.use as any)[k] = () =>
      useStore(_store, (s) => s[k as keyof typeof s])
  }

  return store
}

用法与 React 存储相同。如果你有一个像这样的存储：

import { createStore } from 'zustand'

interface BearState {
  bears: number
  increase: (by: number) => void
  increment: () => void
}

const store = createStore<BearState>((set) => ({
  bears: 0,
  increase: (by) => set((state) => ({ bears: state.bears + by })),
  increment: () => set((state) => ({ bears: state.bears + 1 })),
}))

将该函数应用到你的存储：

const useBearStore = createSelectors(store)

现在选择器是自动生成的，你可以直接访问它们：

// 获取属性
const bears = useBearStore.use.bears()

// 获取操作
const increment = useBearStore.use.increment()

实时演示

有关此的工作示例，请查看Code Sandbox。

第三方库

auto-zustand-selectors-hook react-hooks-global-state zustood @davstack/store