state-controller v1.3.5

State Controller

State management with React Hooks

Installation

npm i state-controller
yarn add state-controller

Example

store/useCounterController.ts

import { useState } from "react"
import stateController,{useIfMounted} from "state-controller" 
import useUserController from "./useUserController"
 
let useValue = ({n=0}) => {

    const [counter, setCounter] = useState({value: n })
    const [,userController] = useUserController()
    const [ifMounted,loading] = useIfMounted();

    const controller = {
        
        increment(n: number){
            setCounter({ ...counter, value: counter.value + n })
            userController.setLastActiveTime( new Date() )
        },

        update(){

            ifMounted(
              async ()=>{
                  return {value:2}
              }
            ).then( setCounter ).catch( e => e && console.error(e) )


            ifMounted({value:2}).then( setCounter )

            if( ifMounted() ){
              setCounter({value:2})
            }
        }
    }
 
    return [counter,controller,loading] as const;
}

let useCounterController = stateController.create(useValue)
export default useCounterController

store/useUserController.ts

import { useState, useMemo } from "react"
import stateController from "state-controller" 
 
const useValue = () => {
 
    const [user, setUser] = useState({
        name: "", 
        lastActiveTime: new Date()
    }) 
 
    const controller = useMemo( ()=>({ 
        setName(n: string){
            setUser( user=>({ ...user, name: n }) )
        }, 
        setLastActiveTime(d:Date){
            setUser( user=>( { ...user,  lastActiveTime: d} ) )
        },
    }),[])

    return [user,controller] as const;
}

let useUserController = stateController.create(useValue)
export default useUserController

"Counter.tsx"

import React, { useEffect } from "react"
import useCounterController from "./store/useCounterController"
import useUserController from "./store/useUserController"

const Counter:React.FC<{}> = () =>  {
 
  const [counter,counterController] = useCounterController()
  const [user,userController] = useUserController()

  useEffect(
     ()=>{
        userController.setName("stateController")
     },[userController]
  )
  
  return (
    <div>
      name: { user.name }<br /> 
      value: {counter.value}<br /> 
      <button onClick={ () => { 
        counterController.increment(1);  
      } }>add</button>  { user.lastActiveTime.toLocaleString() }
      <br /> <br /> 
    </div>
  )
}
 
export default Counter;

index.tsx

import React from "react"
import ReactDOM from 'react-dom'; 
import Counter from "./Counter"
import useUserController from "./store/useUserController";
import useCounterController from "./store/useCounterController";
import stateController from "state-controller" 

const App: React.FC = () => {  
    
  let  useStore = stateController.combine(useUserController,useCounterController)
  return ( 
      <useStore.Provider > 
        <Counter />
        <Counter />
      </useStore.Provider>  
  );
}
 
ReactDOM.render(<App />, document.getElementById('root'));