Persistent Redux store for Reasonaboutable:tm: Offline-First applications, with first-class support for optimistic UI. Use with React, React Native expo.

Quick start

1. Install with npm (or Yarn)

For React Native Expo SDK 36

npm install --save redux-offline-expo

2. Add the offline store enhancer with compose

import { applyMiddleware, createStore, compose } from 'redux';
import { offline } from 'redux-offline-expo';
import offlineConfig from 'redux-offline-expo/lib/defaults';

// ...

const store = createStore(
  reducer,
  preloadedState,
  compose(
    applyMiddleware(middleware),
    offline(offlineConfig)
  )
);

3. Decorate actions with offline metadata

const followUser = userId => ({
  type: 'FOLLOW_USER_REQUEST',
  payload: { userId },
  meta: {
    offline: {
      // the network action to execute:
      effect: { url: '/api/follow', method: 'POST', json: { userId } },
      // action to dispatch when effect succeeds:
      commit: { type: 'FOLLOW_USER_COMMIT', meta: { userId } },
      // action to dispatch if network action fails permanently:
      rollback: { type: 'FOLLOW_USER_ROLLBACK', meta: { userId } }
    }
  }
});

If the effect payload is something other than JSON you can pass the body and headers:

const registerUser = (name, email) => ({
  type: 'REGISTER_USER',
  payload: { name, email },
  meta: {
    offline: {
      // the network action to execute:
      effect: { url: '/api/register', method: 'POST', body: `name=${name}&email=${email}`, headers: { 'content-type': 'application/x-www-form-urlencoded' } },
      // action to dispatch when effect succeeds:
      commit: { type: 'REGISTER_USER_COMMIT', meta: { name, email } },
      // action to dispatch if network action fails permanently:
      rollback: { type: 'REGISTER_USER_ROLLBACK', meta: { name, email } }
    }
  }
});

4. (React Native Android) Ask permission to read network status

If writing a native app for Android, you'll need to make sure to request the permission to access network state in your AndroidManifest.xml:

  <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />

See Documentation for configuration options, the full API, and common recipes.

Contributing

Improvements and additions welcome. For large changes, please submit a discussion issue before jumping to coding; we'd hate you to waste the effort.

If you are reporting a bug, please include code that reproduces the error. Here is a starting application on CodeSandbox.

In lieu of a formal style guide, follow the included eslint rules, and use Prettier to format your code.

Miscellanea

Usage with Redux Persist v5

In case you want to use a custom redux-persist version, there is an example configuration.

Prior art

Redux Offline is a distillation of patterns discovered while building apps using previously existing libraries:

• Forbes Lindesay's redux-optimist
• Zack Story's redux-persist

Without their work, Redux Offline wouldn't exist. If you like the ideas behind Redux Offline, but want to build your own stack from lower-level components, these are good places to start.

License

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