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iFlow is a concise & powerful state management framework, iFlow has no dependencies and it's very small(5k).

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Implement simple todo in five minutes

It's dynamic and extensible, you can directly use it to add, delete and reassign the state/action. It completely supports plain class and function based on mutable data structures, and be easy to OOP. If you use React, you need use react-iflow for the connector.


  • 🎯Plain class and function - Simple, Freestyle of the store structure for personal preference.
  • 🏬Store tree compose - Store tree be easy to store share the operating.
  • ⚡Dynamic and hot-swapping - Both the state and action can be directly and freely changed.
  • 💥Async function and others type functions - Any actions will be composed or invoked internal.
  • 🚀Powerful middleware - Middleware can handle the store any change event.
  • 🔥Store support immutable - Store is supported to be processed into a immutable store.

Documents / 中文文档


Getting started

  • State

    support all ECMAScript2015 data types except function, and state can be defined or assigned later. ```javascript import iFlow from 'iflow'

const pipe = iFlow({ counter: 0, })

* Action
> support all type functions, and dynamic insert action or remove it.If you use `function`, its function's `this` is the current self pipe store. If you ues `arrow function`, the last argument is the current `self` pipe store.
import iFlow from 'iflow'

const pipe = iFlow({
  calculate: function(number) {
    this.counter += number
  counter: 0,
  • Data flow

    View trigger function from store action, and run state's setter paths/value, then its setter paths was matched to the components's getter paths, finally decide whether to update ```javascript import iFlow from 'iflow'

const pipe = iFlow({ calculate: function(number) { this.counter += number }, counter: 0, })

const store = pipe.create()

console.log(store.counter) // console.log: 1


yarn add iflow
npm install --save iflow

If you want to use it completely, you may also need a connector for your Web view framework. For example, you used React and iFlow, and you should use react-iflow for the connector.


import iFlow from 'iflow'

const pipe = iFlow({
  calculate: function(number) {
    this.counter += number
  counter: 0,

pipe.addObserver((store) => {
  console.log(`log '[ store counter ]': `, store.counter)

const store = pipe.create({counter: 1})

Implement simple todo in five minutes

1.First we finish quickly a TODO project configuration and basic NPM package dependencies.

mkdir example && cd example
yarn init -y
yarn add -D parcel-bundler babel-cli babel-preset-react babel-preset-env
yarn add react react-dom iflow react-iflow

2.Then we complete a Babel configuration file and an app portal file index.html

echo '{"presets": ["env","react"]}' > .babelrc
echo '<div id="app"></div><script src="./index.js"></script>' > index.html

3.And then we complete a simple TODO

cat <<EOF > index.js
import React from 'react'
import ReactDOM from 'react-dom'
import iFlow from 'iflow'
import flow from 'react-iflow'

const store = iFlow({
    todo: [],
    toggle(item){item.completed = !item.completed}

const App = flow(store)(class extends React.Component {
    render() {
        const {todo,add,toggle} = this.props.store
        return (
                <input ref={(ref)=>this.input=ref}/>
                <button onClick={()=>{add(this.input.value);this.input.value=''}}>Add</button>
                    {todo.map((item,key)=>(<li key={key} style={item.completed?{textDecoration:'line-through'}:{}} onClick={()=>toggle(item)}>{item.text}</li>))}


4.Finally we run up, hey!🎉🎉🎉

npx parcel index.html


API Reference

  • iFlow

    It can handle data structures other than function. ```javascript import iFlow from 'iflow'

const pipe = iFlow({ counter: 0, calculate (number) { this.counter += number } })

import iFlow from 'iflow'

class Count {
  constructor () {
    this.counter = 0

  calculate (number) {
    this.counter += number

const pipe = iFlow(new Count())
import iFlow from 'iflow'
const pipe = iFlow([])
  • middleware()

    The Middleware API will Listen to the store any change, and modify it.

      stateWillInitialize: (...args) => {},
      actionWillStart: (...args) => {},
      stateWillChange: (...args) => {},
      stateDidChange: (...args) => {},
      actionDidEnd: (...args) => {},
  • The middleware tables are as follows:

APIs Direct API return return value Async Description
stateWillInitialize setInitializeValue add initialized values Initialized
actionWillStart addInterceptor action parameters Action forward
stateWillChange addMiddleware a setter value State Change forward
stateDidChange addObserver - State Change Notification
actionDidEnd addListener - Action Notification
  • create()

    Every pipe will be created with initial value or without.

    const store = pipe.create({
    counter: 100,
  • batch(action,...paths) / @batch(...paths)

    It will batch to update the states

No pass the paths arguments, then it will update the pipe store.

const pipe = iFlow({
  action: batch(function(){
    //state changes
const pipe = iFlow({
  action: function(){
      //state changes
    }, 'foo', ['foobar','bar']).call(this)
class Pipe {
  @batch('foo', ['foobar','bar'])
    //state changes
const pipe = iFlow(new Pipe())

How it works

Data Flow


Online Documents


  • Keep the data structure primitive

iFlow because of the proxy mechanism, it retains the primitive nature of the data structure while supporting asynchronous functions as well as other types of functions, including, of course, ordinary classes and functions.

  • No boilerplate code

iFlow can give you more freedom to use it to implement a state data structure that is in line with the actual development needs, and not to have too many boilerplate code because of the limitations of various libraries.

  • Be easy to OOP

Sometimes when we need decoupled business code, we may need some object-oriented programming when design, so the State Library is better if it can support it.

  • As few selectors as possible

When using a web framework such as react, the corresponding connection library react-iflow allows you to write and manipulate as few selectors as possible.

  • Powerful middleware

If necessary, in fact iFlow's middleware is powerful and useful, and you can use it to implement a variety of coupled codes.

  • Composable and scalable store

iFlow advocates the store group to synthesize the store tree without worrying about the performance impact of the unrelated store, because it is dynamically matched and you can be assured of free combination and expansion of the store.

Limitations and pitfalls

For the action of a normal synchronization process, the merge problem with the same state being changed multiple times is ignored and we will fix it.

Since IE11 does not support ES6 Proxy/Reflect, we will consider adding Proxy/Reflect polyfill to support IE11.

Currently known unsupported types are: Set / WeakSet / Map / WeakMap, and soon we will support it.

Support and compatibility

Browsers Chrome IE Edge FireFox Safari Opera Node
Version 49+ - 12+ 18+ 10+ 36+ 6.4.0+

Change Log

  • Completed immutable store
  • Completed alpha version



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