hydux

by hydux

hydux / hydux

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

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Hydux

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A light-weight Elm-like alternative for Redux ecosystem, inspired by Hyperapp and Elmish.

Contents

Features

timetravel

Try it online!

Install

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!

yarn add [email protected]^v0.5.8
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.

// 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.

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.

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:

// 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.

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?

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

Ecosystem

Libraries

Samples

Counter App

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 http://localhost:8080 and hack!

Why

After trying Fable + 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 + 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), ultradom(built-in), Preact, 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, you know you want it!

License

MIT

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