mst-persist

Persist and hydrate MobX-state-tree stores.

Installation

npm i -S mst-persist

Usage

import { types } from 'mobx-state-tree'
import localForage from 'localForage'
import { persist } from 'mst-persist'

const SomeStore = types.model('Store', {
  name: 'John Doe',
  age: 32
})

const someStore = SomeStore.create()

persist('some', someStore, {
  storage: localForage,  // or AsyncStorage in react-native.
                         // default: localStorage
  jsonify: false  // if you use AsyncStorage, this shoud be true
                  // default: true
  whitelist: ['name']  // only these keys will be persisted
}).then(() => console.log('someStore has been hydrated'))

API

persist(key, store, options)

• arguments

  • key string The key of your storage engine that you want to persist to.
  • store MST store The store to be persisted.
  • options object Additional configuration options.
    • storage localForage / AsyncStorage / localStorage Any Storage Engine that has a Promise-style API similar to localForage. The default is localStorage, which has a built-in adaptor to make it support Promises. For React Native, one may configure AsyncStorage instead.
      Any of redux-persist's Storage Engines should also be compatible with mst-persist.
    • jsonify bool Enables serialization as JSON (default: true).
    • whitelist Array<string> Only these keys will be persisted (defaults to all keys).
    • blacklist Array<string> These keys will not be persisted (defaults to all keys).

• returns a void Promise

Node and Server-Side Rendering (SSR) Usage

Node environments are supported so long as you configure a Storage Engine that supports Node, such as redux-persist-node-storage, redux-persist-cookie-storage, etc. This allows you to hydrate your store server-side.

For SSR though, you may not want to hydrate your store server-side, so in that case you can call persist conditionally:

if (typeof window !== 'undefined') { // window is undefined in Node
  persist(...)
}

With this conditional check, your store will only be hydrated client-side.

Examples

None yet, but can take a look at agilgur5/react-native-manga-reader-app which uses it in production. Can view the commit that implements it here.

Can also view some of the internal tests.

How it works

Basically just a small wrapper around MST's onSnapshot and applySnapshot. The source code is currently shorter than this README, so take a look under the hood! :)

Credits

Inspiration for parts of the code and API came from redux-persist, mobx-persist, and this MST persist PoC gist