React Native Hooks - usePersistStorage

Persist and rehydrate a context store by React Hooks

• An asynchronous persist storage
• Support sensitive info both on iOS & Android
• Migration function

Install

Install react-native-use-persist-storage

$ yarn add react-native-use-persist-storage

Install @react-native-async-storage/async-storage, react-native-sensitive-info (see peerDependencies)

$ yarn add react-native-sensitive-info @react-native-async-storage/async-storage

If RN < 0.60, link dependencies

$ react-native link react-native-sensitive-info
$ react-native link @react-native-async-storage/async-storage

Note: For IOS project using pods, run: $ cd ios/ && pod install

Peer Dependencies

Note: react-native-use-persist-storage requires the following peer dependencies:

• react >= 16.8.1
• react-native >= 0.59.0
• react-native-sensitive-info
• @react-native-async-storage/async-storage

---

Usage

Make sure you know how React Hooks works, and you can use it just same as useState.

Basic Usage

// User.js
import { usePersistStorage } from "react-native-use-persist-storage";

const createDefaultUser = () => ({
  name: ""
});

const User = props => {
  const [user, setUser, restored] = usePersistStorage(
    "@User",
    createDefaultUser
  );
  if (restored) return <Text>loading...</Text>;
  return <Text>{user.name}</Text>;
};

Context Usage

If you want a light-weight global state management solution in react, try using Context.

// contexts/user.js
import { createContext } from 'react'
import { usePersistStorage } from 'react-native-use-persist-storage'

const createDefaultUser = () => ({
  name: '',
});

const UserContext = createContext(...);

const UserProvider = props => {
  const [user, setUser, restored] = usePersistStorage('@User', createDefaultUser);

  // anything you need...

  return (
    <UserContext.Provider value={
      { user, updateUser: setUser, restored }
      // or like this
      // [ user, updateUser: setUser, restored ]
    }>
      {props.children}
    </UserContext.Provider>
  );
};

// GlobalStateProvider.ts
const GlobalStateProvider = ({ children }) => (
  <OtherContextProvider>
    <UserProvider>
      {children}
    </UserProvider>
  </OtherContextProvider>
)

// App.js
const App = () => {
  return (
    <GlobalStateProvider>
      <Root />
    </GlobalStateProvider>
  );
};

Recommend use: createPersistContext

API

usePersistStorage(key, initialValue, options?)

• arguments
  • key: async storage key
  • initialValue: initial value
  • options: set options debug, persist, version, migrate, sensitive.

options (see)

• debug: call console.debug when any persist storage action.
  • default: false
• persist: set false, it will same as useState
  • default: true
• version: storage version, set with migrate function
  • default: 0
• migrate: set migrate function, see how to use createMigrate
  • default: null
• sensitive: pass config options, it will use react-native-sensitive-info to store your data.
  • default: false

createPersistContext

It is a simple built-in util function for easy use. See

// contexts/user.js
import { createPersistContext } from 'react-native-use-persist-storage';

export default createPersistContext({
  storageKey: '@User',
  defaultData: {
    name: 'Awesome!'
  },
  options: { ... }
});

// App.js
import User from './contexts/user';
const App = () => {
  return (
    <User.Provider>
      <Root />
    </User.Provider>
  );
};

// Component.js
import User from './contexts/user';

const Component = () => {
  const [user, setUser] = User.useData();
  return ...
};

Or, you can create a hook to customize

// hooks/useUser.js
import User from './contexts/user';

const useUser = () => {
  const [user, setUser] = useContext(User.Context);
  const setName = () => ...
  const setEmail = () => ...
  return {
    user,
    setName,
    setEmail,
    setUser,
    // anything ...
  };
};

const Component = () => {
  const { user, ... } = useUser();
  ...
}

createMigrate

Use like redux migration

import { createMigrate, usePersistStorage } from 'react-native-use-persist-storage';

const [user, setUser, restored] = usePersistStorage(
  '@User',
  defaultUser,
  {
    version: 2,
    migrate: createMigrate(
      {
        1: state => {
          // ...
        },
        2: state => ({
          // ...
        }),
        
      },
    ),
  },
)

setPersistStorageDefaults

You can control all default options when app initialized.(see)

• open debug log:

setPersistStorageDefaults({ debug: true });

• remove all stored values in persistent storage:

setPersistStorageDefaults({ persist: false });