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redux-saga
redux-saga is a library that aims to make application side effects (i.e. asynchronous things like data fetching and impure things like accessing the browser cache) easier to manage, more efficient to execute, easy to exam, and better at handling failures.
The mental model is that a saga is like a carve up thread in your application that'south solely responsible for side furnishings. redux-saga is a redux middleware, which means this thread tin can be started, paused and cancelled from the main application with normal redux actions, it has access to the full redux awarding state and it can dispatch redux actions too.
Information technology uses an ES6 feature called Generators to brand those asynchronous flows easy to read, write and test. (if you're not familiar with them here are some introductory links) By doing so, these asynchronous flows look like your standard synchronous JavaScript code. (kind of similar async/await, but generators have a few more awesome features nosotros need)
You might've used redux-thunk before to handle your data fetching. Opposite to redux thunk, you don't terminate up in callback hell, you can test your asynchronous flows easily and your actions stay pure.
Getting started
Install
or
Alternatively, you lot may utilise the provided UMD builds directly in the <script> tag of an HTML page. Run across this department.
Usage Example
Suppose nosotros take a UI to fetch some user data from a remote server when a push button is clicked. (For brevity, nosotros'll but evidence the activity triggering code.)
class UserComponent extends React . Component { ... onSomeButtonClicked ( ) { const { userId, dispatch } = this . props dispatch ( { type: 'USER_FETCH_REQUESTED' , payload: {userId} } ) } ... } The Component dispatches a plain Object activity to the Store. We'll create a Saga that watches for all USER_FETCH_REQUESTED deportment and triggers an API call to fetch the user data.
sagas.js
import { call , put , takeEvery , takeLatest } from 'redux-saga/effects' import Api from '...' // worker Saga: will exist fired on USER_FETCH_REQUESTED actions function * fetchUser ( activeness ) { try { const user = yield call ( Api . fetchUser , activeness . payload . userId ) ; yield put ( { type: "USER_FETCH_SUCCEEDED" , user: user } ) ; } take hold of ( east ) { yield put ( { type: "USER_FETCH_FAILED" , message: e . message } ) ; } } /* Starts fetchUser on each dispatched `USER_FETCH_REQUESTED` action. Allows concurrent fetches of user. */ function * mySaga ( ) { yield takeEvery ( "USER_FETCH_REQUESTED" , fetchUser ) ; } /* Alternatively y'all may use takeLatest. Does non let concurrent fetches of user. If "USER_FETCH_REQUESTED" gets dispatched while a fetch is already pending, that pending fetch is cancelled and only the latest one volition be run. */ function * mySaga ( ) { yield takeLatest ( "USER_FETCH_REQUESTED" , fetchUser ) ; } export default mySaga ; To run our Saga, we'll have to connect it to the Redux Store using the redux-saga middleware.
main.js
import { createStore , applyMiddleware } from 'redux' import createSagaMiddleware from 'redux-saga' import reducer from './reducers' import mySaga from './sagas' // create the saga middleware const sagaMiddleware = createSagaMiddleware ( ) // mount it on the Store const store = createStore ( reducer , applyMiddleware ( sagaMiddleware ) ) // then run the saga sagaMiddleware . run ( mySaga ) // render the awarding Documentation
- Introduction
- Basic Concepts
- Advanced Concepts
- Recipes
- External Resources
- Troubleshooting
- Glossary
- API Reference
Translation
- Chinese
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- Russian
Using umd build in the browser
At that place is likewise a umd build of redux-saga available in the dist/ binder. When using the umd build redux-saga is available every bit ReduxSaga in the window object. This enables y'all to create Saga middleware without using ES6 import syntax similar this:
var sagaMiddleware = ReduxSaga . default ( ) The umd version is useful if you don't use Webpack or Browserify. Yous can admission it directly from unpkg.
The following builds are bachelor:
- https://unpkg.com/redux-saga/dist/redux-saga.umd.js
- https://unpkg.com/redux-saga/dist/redux-saga.umd.min.js
Important! If the browser you are targeting doesn't support ES2015 generators, you must transpile them (i.e. with babel plugin) and provide a valid runtime, such as the 1 here. The runtime must be imported before redux-saga:
import 'regenerator-runtime/runtime' // then import sagaMiddleware from 'redux-saga' Building examples from sources
$ git clone https://github.com/redux-saga/redux-saga.git $ cd redux-saga $ yarn $ npm examination Below are the examples ported (then far) from the Redux repos.
Counter examples
There are three counter examples.
counter-vanilla
Demo using vanilla JavaScript and UMD builds. All source is inlined in index.html.
To launch the case, open index.html in your browser.
Important: your browser must support Generators. Latest versions of Chrome/Firefox/Edge are suitable.
counter
Demo using webpack and high-level API takeEvery.
$ npm run counter # examination sample for the generator $ npm run examination-counter cancellable-counter
Demo using low-level API to demonstrate task counterfoil.
$ npm run cancellable-counter Shopping Cart case
$ npm run shop # exam sample for the generator $ npm run exam-shop async example
$ npm run async # exam sample for the generators $ npm run test-async existent-world example (with webpack hot reloading)
$ npm run real-globe # sorry, no tests yet TypeScript
Redux-Saga with TypeScript requires DOM.Iterable or ES2015.Iterable. If your target is ES6, you are likely already set, withal, for ES5, you will need to add information technology yourself. Check your tsconfig.json file, and the official compiler options documentation.
Logo
You tin can find the official Redux-Saga logo with unlike flavors in the logo directory.
Redux Saga chooses generators over async/expect
A few issues have been raised asking whether Redux saga plans to utilize async/await syntax instead of generators.
We will go along to utilise generators. The principal machinery of async/await is Promises and it is very difficult to retain the scheduling simplicity and semantics of existing Saga concepts using Promises. async/await simply don't allow for sure things - similar i.e. cancellation. With generators nosotros have full power over how & when furnishings are executed.
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License
Copyright (c) 2015 Yassine Elouafi.
Licensed under The MIT License (MIT).
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