@devtea2025/necessitatibus-rem-quo-illum

React use hook for global event dispatch and listening

This package provide a simple mechanism for components across any level in the hierarchy to communicate via events. ~~Without a top-level redux store and verbose reducer.~~

Features

• Realtime event-based communication across multiple components
• Support any javascript data type
• Do not need to combine states and reducers into a centralized redux store
• Compatible with React.useState() and other stateful use hooks
• Works in both react-dom and react-native environment

Demo: https://@devtea2025/necessitatibus-rem-quo-illum-demo.surge.sh

Description

The event listener is auto registered when the component is mount, and got unregistered when the component is unmounted.

You can store the state in any component using ClassComponent.state or React.useState() or any use hooks that fit your need. And you can dispatch event from any component.

The events are dispatched using the native DOM (using window as target), therefore it can work outside react as well.

Install

## using npm
npm install @devtea2025/necessitatibus-rem-quo-illum

## or using yarn
yarn add @devtea2025/necessitatibus-rem-quo-illum

## or using pnpm
pnpm install @devtea2025/necessitatibus-rem-quo-illum

Typescript Signature

export function useEvent<E extends EventType>(
  type: E['type'],
  onEvent?: (event: E) => void,
): Dispatch<E>

export function dispatch<E extends EventType>(
  type: E['type'],
  data: Omit<E, 'type'>,
): void

export type EventType<
  Type extends string = string,
  Data extends object = {}
> = {
  type: Type
} & Data

export type Dispatch<E extends EventType> = (data: Omit<E, 'type'>) => void

export default useEvent

Usage

import React, { useState } from 'react'
import { useEvent } from '@devtea2025/necessitatibus-rem-quo-illum'

const DemoApp = () => {
  return (
    <>
      <View />
      <Buttons />
    </>
  )
}

type CounterEvent = {
  type: 'Counter'
  delta: number
}

const View = () => {
  const [count, setCount] = useState(0)
  // auto add listener when mount, and remove listener when unmount
  useEvent<CounterEvent>('Counter', event => {
    setCount(count + event.delta)
  })
  return <div>{count}</div>
}

const Buttons = () => {
  // setup event dispatcher
  const dispatchCounter = useEvent<CounterEvent>('Counter')
  return (
    <div>
      <button onClick={() => dispatchCounter({ delta: -1 })}>-1</button>
      <button onClick={() => dispatchCounter({ delta: +1 })}>+1</button>
    </div>
  )
}

export default DemoApp

Details see Example.tsx and DemoApp.tsx

License

This project is licensed with BSD-2-Clause

This is free, libre, and open-source software. It comes down to four essential freedoms [ref]:

• The freedom to run the program as you wish, for any purpose
• The freedom to study how the program works, and change it so it does your computing as you wish
• The freedom to redistribute copies so you can help others
• The freedom to distribute copies of your modified versions to others