zustand-persist

Zustand persist

Persist and rehydrate state works on react and react native.

Zustand is a small, fast and scaleable bearbones state-management solution.

This library is inspired by https://github.com/rt2zz/redux-persist.

Contributions are Welcome

$ npm install zustand-persist
$ yarn add zustand-persist

Try Demo Here

Middleware

// if in react native
// import AsyncStorage from '@react-native-community/async-storage'

const { persist, purge } = configurePersist({
  storage: localStorage, // use `AsyncStorage` in react native
  rootKey: 'root', // optional, default value is `root`
})

const useStore = createStore(
  persist({
    key: 'auth', // required, child key of storage
    allowlist: ['isAuthenticated', 'user'], // optional, will save everything if allowlist is undefined
    denylist: [], // optional, if allowlist set, denylist will be ignored
  }, (set) => ({
    isAuthenticating: false,
    isAuthenticated: false,
    user: undefined,
    login: async (username, password) =>{
      set((state) => ({ isAuthenticating: true }))
      const { user } = await webLogin(username, password)
      set((state) => ({
        isAuthenticated: true,
        isAuthenticating: false,
        user,
      })),
    }
  }))
)

PersistGate

function App() {
  // Must call useStore to bootstrap persistence or will stop on loading screen
  useStore()
  return (
    <PersistGate
      onBeforeLift={() => {
        console.log('onBeforeLift')
      }}
      loading={<Loading />}>
      <AppContent />
    </PersistGate>
  )
}

Limitations

Zustand allows any valid JavaScript data types to set in the store, such as Set, Map, or functions. Both localStorage and AsyncStorage require that all values set in them be serializable, or converted into string form for storage. This means if you wish to persist the contents of your store all of its values need to be serializable. Any values which are not serializable will be silently absent upon hydration.

A note on storing actions (functions): your actions are safe as long as they exist in the initial state during store creation. The hydration process merges initial state with stored state.

Todo

• enhanced removing root logic