immutable support for redux-persist
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README.md

Redux Persist Transform Immutable

Add immutable sub-reducer support to redux-persist.

NOTE this handles immutable state on a per-reducer basis. If your top level state is an immutable map, this module will not work.

Breaking Change

v5 changes from transitjs to remotedev-serialize. For existing projects that upgrade to v5, all persisted data will be lost upon the initial persist. note It is possible to write an upgrade via a custom transform that supports both formats - if you do write one please PR!

Usage with Redux Persist

import { createStore, combineReducers } from 'redux'
import { persistStore, persistReducer } from 'redux-persist'
import immutableTransform from 'redux-persist-transform-immutable'

const persistConfig = {
  transforms: [immutableTransform()],
  key: 'root',
  storage
}

const reducer = combineReducers(reducers)
const persistedReducer = persistReducer(persistConfig, reducer)
const store = createStore(persistedReducer)

persistStore(store)

Config

For config, please refer to redux-persist's docs.

Usage with Records

By default, immutable Records will be persisted and restored as Maps, because the library has no way of knowing what your Record constructor looks like. To change this behavior and allow a Record to be persisted and restored as a Record instance, you'll need to do two things:

  1. Add a name attribute to your record (this is the second argument to a Record's constructor).
  2. Pass your Record constructor to the transformer's withRecords() function to generate a transformer capable of serializing and deserializing the record.

Minimal example:

import { compose } from 'redux'
import { persistStore, autoRehydrate } from 'redux-persist'
import immutableTransform from 'redux-persist-transform-immutable'

const reducer = combineReducers(reducers)
const store = compose(autoRehydrate(), createStore)(reducer)

const MyRecord = Record({
  foo: 'null'
}, 'MyRecord') // <- Be sure to add a name field to your record

persistStore(
  store,
  {
    transforms: [immutableTransform({records: [MyRecord]})]
  }
)

Avoiding Unnecessary Serialization

By default, redux-persist-immutable-transform will serialize and deserialize all passed objects using transit-immutable-js. If you are concerned about performance, you can either whitelist or blacklist reducer that you know are not immutable.

Example state object:

state = {
  username: 'john',
  imageUri: 'images/profilePic.png',
  friends: Immutable.List([ ... ])
}

Set up the transformer to ignore the string-based reducer keys:

persistStore(store, {
  transforms: [immutableTransform({
    blacklist: ['username', 'imageUri']
  })]
})

/* OR */

persistStore(store, {
  transforms: [immutableTransform({
    whitelist: ['friends']
  })]
})