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https://github.com/hydux/hydux

A light-weight type-safe Elm-like alternative for Redux ecosystem, inspired by hyperapp and Elmish
https://github.com/hydux/hydux

2kb elm-architecture framework hydux hyperapp preact react router ssr state-management type-safe typescript virtual-dom

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A light-weight type-safe Elm-like alternative for Redux ecosystem, inspired by hyperapp and Elmish

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README 

        
# Hydux



[![Build Status](https://travis-ci.org/hydux/hydux.svg?branch=master)](https://travis-ci.org/hydux/hydux) [![npm](https://img.shields.io/npm/v/hydux.svg)](https://www.npmjs.com/package/hydux) [![npm](https://img.shields.io/npm/dm/hydux.svg)](https://www.npmjs.com/package/hydux) [![Join the chat at https://gitter.im/hydux/hydux](https://badges.gitter.im/hydux/hydux.svg)](https://gitter.im/hydux/hydux?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge)



A light-weight Elm-like alternative for Redux ecosystem, inspired by [Hyperapp](https://github.com/hyperapp/hyperapp) and [Elmish](https://github.com/fable-elmish/elmish).



## Contents



- [Hydux](#hydux)

  - [Contents](#contents)

  - [Features](#features)

  - [Try it online!](#try-it-online)

  - [Install](#install)

  - [React-hooks like dependency injection for state/actionsNew!](#react-hooks-like-dependency-injection-for-stateactionssup-style%22color-red%22newsup)

  - [Quick Example](#quick-example)

  - [Init with Command](#init-with-command)

  - [Actions with Command](#actions-with-command)

  - [Parent-Child Components Communication](#parent-child-components-communication)

  - [Documentation](#documentation)

  - [Ecosystem](#ecosystem)

    - [Libraries](#libraries)

    - [Samples](#samples)

  - [Counter App](#counter-app)

  - [Why](#why)

  - [License](#license)



## Features



* Elm Architecture, split your whole app with **init**, **state**, **actions**.

* [hyperapp](https://github.com/hyperapp/hyperapp) compatible API

* Elm-like [side effect manager](https://github.com/hydux/hydux#actions-with-cmd) and subscribe API

* Support any vdom library, including react ([official support](https://github.com/hydux/hydux-react))

* [Router (**Recommended**)](https://github.com/hydux/hydux/tree/master/examples/router)

* [Official support for react-router](https://github.com/hydux/hydux-react-router)

* Hot reload (hmr)

* [Server-Side Rendering(SSR)](https://github.com/hydux/hydux/tree/master/docs/ssr.md)

* [code splitting](https://github.com/hydux/hydux/tree/master/examples/code-splitting), seamlessly integrated with SSR.

* logger, persist, [Redux Devtools with time traveling](https://github.com/zalmoxisus/redux-devtools-extension), [ultradom](https://github.com/jorgebucaran/ultradom)(1kb vdom), **\*\*All in One\*\***, easily setup all these fancy stuff without pain!



![timetravel](media/timetravel.gif)



## [Try it online!](https://codepen.io/zaaack/pen/zPgodL)



## Install



```sh

yarn add hydux # or npm i hydux

```



## React-hooks like dependency injection for state/actionsNew!



This is an experimental dependency injection API for actions inspired by react-hooks, totally downward compatible, with this we don't need curring to inject state and actions or manually markup types for the return value any more!



```sh

yarn add hydux@^v0.5.8

```



```ts

import { inject } from 'hydux'



export default {

  init: () => ({ count: 1 }),

  actions: {

    down() {

      let { state, actions, setState, Cmd } = inject()

      setState({ count: state.count - 1 })

      Cmd.addSub(_ => _.log('down -1'))

      actions.up()

    },

    up() {

      let { state, actions } = inject()

      return { count: state.count + 1 }

    },

    log(msg) {

      console.log(msg)

    }

  },

  view: (state, actions) => {

    return (

      


        
{state.count}


        –

        +

      


    )

  }

}



```



## Quick Example



Let's say we got a counter, like this.



```js

// Counter.js

export default {

  init: () => ({ count: 1 }),

  actions: {

    down: () => state => ({ count: state.count - 1 }),

    up: () => state => ({ count: state.count + 1 })

  },

  view: (state: State, actions: Actions) =>

    


      
{state.count}


      –

      +

    


}

```



Then we can compose it in Elm way, you can easily reuse your components.



```js

import _app from 'hydux'

import withUltradom, { h, React } from 'hydux/lib/enhancers/ultradom-render'

import Counter from './counter'



// use built-in 1kb ultradom to render the view.

let app = withUltradom()(_app)



const actions = {

  counter1: Counter.actions,

  counter2: Counter.actions,

}



const state = {

  counter1: Counter.init(),

  counter2: Counter.init(),

}



const view = (

  state: State,

  actions: Actions,

) =>

    

      
Counter1:


      {Counter.view(state.counter1, actions.counter1)}

      
Counter2:


      {Counter.view(state.counter2, actions.counter2)}

    



export default app({

  init: () => state,

  actions,

  view,

})

```



## Init with Command



You can init the state of your app via plain object, or with side effects, like fetch remote data.



```ts

import * as Hydux from 'hydux'



const { Cmd } = Hydux



export function init() {

  return {

    state: { // pojo state

      count: 1,

    },

    cmd: Cmd.ofSub( // update your state via side effects.

      _ => fetch('https://your.server/init/count') // `_` is the real actions, don't confuse with the plain object `actions` that we created below, calling functions from plain object won't trigger state update!

        .then(res => res.json())

        .then(count => _.setCount(count))

    )

  }

}



export const actions = {

  setCount: n => (state, actions) => {

    return { count: n }

  }

}



```



If we want to init a child component with init command, we need to map it to the sub level via lambda function, just like **type lifting** in Elm.

```ts

// App.tsx

import { React } from 'hydux-react'

import * as Hydux from 'hydux'

import * as Counter from 'Counter'

const Cmd = Hydux.Cmd



export const init = () => {

  const counter1 = Counter.init()

  const counter2 = Counter.init()

  return {

    state: {

      counter1: counter1.state,

      counter2: counter2.state,

    },

    cmd: Cmd.batch(

      Cmd.map((_: Actions) => _.counter1, counter1.cmd), // Map counter1's init command to parent component

      Cmd.map((_: Actions) => _.counter2, counter2.cmd), // Map counter2's init command to parent component

      Cmd.ofSub(

        _ => // some other commands of App

      )

    )

  }

}



export const actions = {

  counter1: Counter.actions,

  counter2: Counter.actions,

  // ... other actions

}



export const view = (state: State, actions: Actions) => (

  

    
Counter1:


    {Counter.view(state.counter1, actions.counter1)}

    
Counter2:


    {Counter.view(state.counter2, actions.counter2)}

  

)



export type Actions = typeof actions

export type State = ReturnType['state']

```



This might be too much boilerplate code, but hey, we provide a type-friendly helper function! See:



```ts

// Combine all sub components's init/actions/views, auto map init commands.

const subComps = Hydux.combine({

  counter1: [Counter, Counter.init()],

  counter2: [Counter, Counter.init()],

})

export const init2 = () => {

  return {

    state: {

      ...subComps.state,

      // other state

    },

    cmd: Cmd.batch(

      subComps.cmd,

      // other commands

    )

  }

}



export const actions = {

  ...subComps.actions,

  // ... other actions

}



export const view = (state: State, actions: Actions) => (

  

    
Counter1:


    {subComps.render('counter1', state, actions)}

    // euqal to:

    // {subComps.views.counter1(state.counter1, actions.counter1)}

    // .render('', ...) won't not work with custom views that not match `(state, actions) => any` or `(props) => any` signature

    // So we still need `.views.counter1(...args)` in this case.

    
Counter2:


    {subComps.render('counter2', state, actions)}

  

)

```



## Actions with Command



This library also implemented a Elm-like side effects manager, you can simple return a record with state, cmd in your action

e.g.



```ts

import app, { Cmd } from 'hydux'



function upLater(n) {

  return new Promise(resolve => setTimeout(() => resolve(n + 10), 1000))

}

app({

  init: () => ({ count: 1}),

  actions: {

    down: () => state => ({ count: state.count - 1 }),

    up: () => state => ({ count: state.count + 1 }),

    upN: n => state => ({ count: state.count + n }),

    upLater: n => (

      state,

      actions/* actions of same level */

    ) => ({

      state, // don't change the state, won't trigger view update

      cmd: Cmd.ofPromise(

        upLater /* a function with single parameter and return a promise */,

        n /* the parameter of the funciton */,

        actions.upN /* success handler, optional */,

        console.error /* error handler, optional */ )

    }),

    // Short hand of command only

    upLater2: n => (

      state,

      actions/* actions of same level */

    ) => Cmd.ofPromise(

      upLater /* a function with single parameter and return a promise */,

      n /* the parameter of the funciton */,

      actions.upN /* success handler, optional */,

      console.error /* error handler, optional */

    ),

  },

  view: () => {/*...*/} ,

})

```



## Parent-Child Components Communication



In Elm, we can intercept child component's message in parent component, because child's update function is called in parent's update function. But how can we do this in hydux?



```js

import * as assert from 'assert'

import * as Hydux from '../index'

import Counter from './counter'



const { Cmd } = Hydux



export function init() {

  return {

    state: {

      counter1: Counter.init(),

      counter2: Counter.init(),

    }

  }

}

const actions = {

  counter2: counter.actions,

  counter1: counter.actions

}

Hydux.overrideAction(

  actions,

  _ => _.counter1.upN,

  (n: number) => (

      action,

      ps: State, // parent state (State)

      pa, // parent actions (Actions)

      // s: State['counter1'], // child state

      // a: Actions['counter1'], // child actions

  ) => {

    const { state, cmd } = action(n + 1)

    assert.equal(state.count, ps.counter1.count + n + 1, 'call child action work')

    return {

      state,

      cmd: Cmd.batch(

        cmd,

        Cmd.ofFn(

          () => pa.counter2.up()

        )

      )

    }

  }

)

type State = ReturnType['state']

type Actions = typeof actions

let ctx = Hydux.app({

  init: () => initState,

  actions,

  view: noop,

  onRender: noop

})



```



## Documentation



* [API tutorial with examples](https://github.com/hydux/hydux/tree/master/docs/api.md)

* [Generated API Reference](https://hydux.github.io/hydux/api)

* [Server-Side Rendering(SSR) Tutorial](https://github.com/hydux/hydux/tree/master/docs/ssr.md)



## Ecosystem



### Libraries



* [hydux-react](https://github.com/hydux/hydux-react): Hydux's react integration

* [hydux-preact](https://github.com/hydux/hydux-preact): Hydux's [preact](https://github.com/developit/preact) integration

* [hydux-react-router](https://github.com/hydux/hydux-react-router): Hydux's react-router integration

* [hydux-mutator](https://github.com/hydux/hydux-mutator): A statically-typed immutable update help package, which also contains immutable collections.

* [hydux-transitions](https://github.com/hydux/hydux-transitions): A css transition library inspired by [animajs](http://animejs.com/)'s timeline, follow **The Elm Architecture**.

* [hydux-data](https://github.com/hydux/hydux-data): Statically-typed data-driven development for hydux, in the Elm way. Inspired by apollo-client.

* [hydux-pixi](https://github.com/hydux/hydux-pixi): High performance [pixi.js](https://github.com/pixijs/pixi.js) renderer for Hydux.

* [hydux code snippets for vscode (TS)](https://github.com/hydux/hydux/tree/master/docs/hydux.code-snippets) Best practice for using hydux + typescript without boilerplate code.



### Samples



* [samples-antd](https://github.com/hydux/samples-antd): Admin sample in hydux.



## Counter App



```sh

git clone https://github.com/hydux/hydux.git

cd hydux

yarn # or npm i

cd examples/counter

yarn # or npm i

npm start

```



Now open  and hack!



## Why



After trying [Fable](https://fable.io) + [Elmish](https://github.com/fable-elmish/elmish) for several month, I need to write a small web App in my company, for many reasons I cannot choose some fancy stuff like [Fable](https://fable.io) + [Elmish](https://github.com/fable-elmish/elmish), simply speaking, I need to use the mainstream JS stack but don't want to bear Redux's cumbersome, complex toolchain, etc anymore.



After some digging around, hyperapp looks really good to me, but I quickly find out it doesn't work with React, and many libraries don't work with the newest API. So I create this to support ****different**** vdom libraries, like React([official support](https://github.io/hydux/hydux-react)), [ultradom](https://github.com/jorgebucaran/ultradom)([built-in](https://github.com/hydux/hydux/blob/master/src/enhancers/ultradom-render.ts)), Preact, [inferno](https://github.com/infernojs/inferno) or what ever you want, just need to write a simple enhancer!



Also, to avoid breaking change, we have ****built-in**** support for HMR, logger, persist, [Redux Devtools](https://github.com/zalmoxisus/redux-devtools-extension), you know you want it!



## License



MIT