Getting Started

Rematch

Rethink Redux.

Rematch is Redux best practices without the boilerplate. No more action types, action creators, switch statements or thunks.

• Why we created Rematch
• Video: Introducing Rematch
• A comparison of Redux & Rematch

Index

• Getting Started
• Purpose
• Examples
• Migration Guide
• API Reference
  • Core API
  • Init Redux API
  • Plugins API
• Recipes
  • Devtools
  • React
  • Vue
  • Testing
  • TypeScript
  • Immer
  • Decoupling reducers
• Plugins
  • Selectors
  • Loading
  • Persist
  • Updated
  • React Navigation
  • Immer
• Inspiration

Translations

• 中文手册

Getting Started

npm install @rematch/core

or

yarn add @rematch/core

Step 1: Init

init configures your reducers, devtools & store.

index.js

import { init } from '@rematch/core'
import * as models from './models'

const store = init({
    models,
})

export default store

For a more advanced setup, see plugins and Redux config options.

Step 2: Models

The model brings together state, reducers, async actions & action creators in one place.

models.js

export const count = {
    state: 0, // initial state
    reducers: {
        // handle state changes with pure functions
        increment(state, payload) {
            return state + payload
        },
    },
    effects: dispatch => ({
        // handle state changes with impure functions.
        // use async/await for async actions
        async incrementAsync(payload, rootState) {
            await new Promise(resolve => setTimeout(resolve, 1000))
            dispatch.count.increment(payload)
        },
    }),
}

See the reducers docs to learn more, including how to trigger actions from other models.

Understanding models is as simple as answering a few questions:

1. What is my initial state? state
2. How do I change the state? reducers
3. How do I handle async actions? effects with async/await

Step 3: Dispatch

dispatch is how we trigger reducers & effects in your models. Dispatch standardizes your actions without the need for writing action types or action creators.

import { init } from '@rematch/core'
import * as models from './models'

const store = init({
    models,
})

export const { dispatch } = store
// state = { count: 0 }
// reducers
dispatch({ type: 'count/increment', payload: 1 }) // state = { count: 1 }
dispatch.count.increment(1) // state = { count: 2 }

// effects
dispatch({ type: 'count/incrementAsync', payload: 1 }) // state = { count: 3 } after delay
dispatch.count.incrementAsync(1) // state = { count: 4 } after delay

Dispatch can be called directly, or with the dispatch[model][action](payload) shorthand.

Step 4: View

Rematch can be used with native redux integrations such as "react-redux". See an example below.

import React from 'react'
import ReactDOM from 'react-dom'
import { Provider, connect } from 'react-redux'
import store from './store'

const Count = props => (
    <div>
        The count is {props.count}
        <button onClick={props.increment}>increment</button>
        <button onClick={props.incrementAsync}>incrementAsync</button>
    </div>
)

const mapState = state => ({
    count: state.count,
})

const mapDispatch = ({ count: { increment, incrementAsync } }) => ({
    increment: () => increment(1),
    incrementAsync: () => incrementAsync(1),
})

const CountContainer = connect(
    mapState,
    mapDispatch
)(Count)

ReactDOM.render(
    <Provider store={store}>
        <CountContainer />
    </Provider>,
    document.getElementById('root')
)

Examples

• Count: JS | React | Vue | Angular
• Todos: React

Migrating From Redux

Moving from Redux to Rematch involves very few steps.

1. Setup Rematch init with Redux step 1
2. Mix reducers & models step 2
3. Shift to models step 3

Migration from 0.x to 1.x

For an earlier version, see v0.x docs. Currently only displaying v1.x documentation.

Breaking changes with v1.0.0. Global imports of dispatch and getState have been removed. Instead, you can export and import your store, capturing store.dispatch, store.getState. See the Changelog for details.

API

See the @rematch/core API

Changelog

See the CHANGELOG to see what's new.

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