Introduction

Installation
First, install the middleware.
npm i redux-promise-middleware -s
Setup
Import the middleware and include it in applyMiddleware when creating the Redux store:
import promise from 'redux-promise-middleware'
​
composeStoreWithMiddleware = applyMiddleware(
  promise,
)(createStore)
Use
Dispatch a promise as the value of the payload property of the action.
const foo = () => ({
  type: 'FOO',
  payload: new Promise()
});
A pending action is immediately dispatched.
{
  type: 'FOO_PENDING'
}
Once the promise is settled, a second action will be dispatched. If the promise is resolved a fulfilled action is dispatched.
{
  type: 'FOO_FULFILLED'
  payload: {
    ...
  }
}
On the other hand, if the promise is rejected, a rejected action is dispatched.
{
  type: 'FOO_REJECTED'
  error: true,
  payload: {
    ...
  }
}
That's it!
Further Reading
​Catching Errors Thrown by Rejected Promises​
​Use with Reducers​
​Optimistic Updates​
​Design Principles​
Copyright (c) 2017 Patrick Burtchaell. Code licensed with the MIT License (MIT). Documentation licensed with the CC BY-NC License.

Last modified 4yr ago