Arda

Meta-Flux framework for real world.

$ npm install arda --save

Concept

Today's Flux is weak at scene transitions. Arda make it simple by router and context(chunk of flux).

Context has Flux features and its stack is very simple.

Dispatcher is just EventEmitter
View is just React.Component (with mixin)
Store should be covered by typesafe steps with promise

I need to develop to make my company's react project simple. Arda is started from extraction of my works and well dogfooded. Thx Increments Inc.

Goals

Transition with Promise
Loose coupling and testable
TypeScript, CoffeeScript, and ES6 friendly
Protect mutable state and make it atomic.

Intro

Context, it extends way of react, is just one flux loop and has data flow, Props => State => ComponentProps

simple example by coffeescript is below.

window.React   = require 'react'
window.Promise = require 'bluebird'
Arda = require 'arda'

# extends Arda.Component or mixin `Arda.mixin` in React.createClass
class Clicker extends Arda.Component
  render: -> React.createElement 'button', {onClick: @onClick.bind(@)}, @props.cnt
  onClick: -> @dispatch 'clicker:++'

class ClickerContext extends Arda.Context
  component: Clicker
  initState: (props) -> cnt: 0
  expandComponentProps: (props, state) -> cnt: state.cnt
  delegate: (subscribe) ->
    super
    # subscribe lifecycle event. See detail later of this README
    subscribe 'context:created', -> console.log 'created'

    # subscribe ui events
    subscribe 'clicker:++', =>
      # state is changed by only context.update(...)
      @update((s) => cnt: s.cnt+1)
      .then -> console.log 'updated!'

window.addEventListener 'DOMContentLoaded', ->
  router = new Arda.Router(Arda.DefaultLayout, document.body)
  router.pushContext(ClickerContext, {})

Transition

Arda.Router has pushContext, popContext and replaceContext and return promise object.

router = new Arda.Router(Arda.DefaultLayout, document.body)
router.pushContext(MainContext, {})             # Main
.then => router.pushContext(SubContext, {})     # Main, Sub
.then => router.pushContext(MainContext, {})    # Main, Sub, Main
.then => router.popContext()                    # Main, Sub
.then => router.replaceContext(MainContext, {}) # Main, Main
.then => console.log router.history

pushContext and replsceContext's second argument is to be context.props as immutable object.

LifeCycle

subscriber = (context, subscribe) ->
  subscribe 'context:created', -> console.log 'created'
  subscribe 'context:started', -> console.log 'started'
  subscribe 'context:paused', -> console.log 'paused'
  subscribe 'context:resumed', -> console.log 'resumed'
  subscribe 'context:disposed', -> console.log 'disposed'

class MyContext extends Arda.Context
  component: MyComponent
  subscribers: [subscriber]

static subscribers is automatic delegator on instantiate.

with TypeScript

To achive purpose to make mutable state typesafe, Arda with TypeScript is better than other AltJS.

interface Props {firstName: string; lastName: string;}
interface State {age: number;}
interface ComponentProps {greeting: string;}

class MyContext extends Arda.Context<Props, State, ComponentProps> {
  get component() {
    return React.createClass({
      mixins: [Arda.mixin],
      render: function(){return React.createElement('h1', {}, this.props.greeting);}
    });
  }

  initState(props){
    // Can use promise  (State | Promise<State>)
    return new Promise<State>(done => {
      setTimeout(done({age:10}), 1000)
    })
  }
  expandComponentProps(props, state) {
    // Can use promise  (ComponentProps | Promise<ComponentProps>)
    return {greeting: 'Hello, '+props.firstName+', '+state.age+' years old'}
  }
}

var router = new Arda.Router(Arda.DefaultLayout, document.body);
// Unfortunately, initial props by router are not validated yet
// If you want, you can create your original router wrapper
router.pushContext(MyContext, {firstName: 'Jonh', lastName: 'Doe'})
.then(context => {
  setInterval(() => {
    context.state(state => {age: state.age+1}) // this is validated
  }, 1000 * 60 * 60 * 24 * 360) // fire once by each year haha:)
});

See typescript working example

Or see mizchi's starter projectmizchi-sandbox/arda-starter-project

Dependencies

React v0.13.0 >=
Promise (I recommend bluebird)

API

See detail at arda.d.ts

LICENSE

MIT

uneco/arda