Rematch

Rethink Redux.

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

Index

Getting Started
Purpose
Examples
Migration Guide
API Reference
Recipes
- Devtools
- React
- Vue
- Testing
- Immer
Plugins
- Subscriptions
- Selectors
- Loading
- Persist
- Updated
- React Navigation
- Immer
Inspiration

Getting Started

npm install @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,
})

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: {
    // handle state changes with impure functions.
    // use async/await for async actions
    async incrementAsync(payload, rootState) {
      await new Promise(resolve => setTimeout(resolve, 1000))
      this.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:

What is my initial state? state
How do I change the state? reducers
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 { dispatch } from '@rematch/core'
                                                  // 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.

Examples

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

import React from 'react'
import ReactDOM from 'react-dom'
import { Provider, connect } from 'react-redux'
import { init } from '@rematch/core'

// State

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

const store = init({
  models: {
    count
  }
})

// View

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')
)

Migrating From Redux

Moving from Redux to Rematch involves very few steps.

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

API

See the @rematch/core API

Like this project? ★ us on Github :)

nWidart / rematch