EventEmitter

An EventEmitter for client side and server side support.

Table of Contents

• Installation
• Usage

Install

npm i @neumatter/event-emitter

Usage

constructor:

Args: options?: { captureRejections?: boolean, maxListeners?: number }

import EventEmitter from '@neumatter/event-emitter'

// default options when undefined:
const eventEmitter = new EventEmitter({ captureRejections: false, maxListeners: 10 })

addListener | on:

Args: eventName: string, listener: (...args) => void

import EventEmitter from '@neumatter/event-emitter'

// default options when undefined:
const eventEmitter = new EventEmitter()

const errorHandler = (err) => {
  console.error(err)
}

eventEmitter.addListener('error', errorHandler)

removeListener | off:

Args: eventName: string, listener: (...args) => void

import EventEmitter from '@neumatter/event-emitter'

// default options when undefined:
const eventEmitter = new EventEmitter()

const errorHandler = (err) => {
  console.error(err)
}

eventEmitter.removeListener('error', errorHandler)

emit:

Args: eventName: string, ...args: any[]

import EventEmitter from '@neumatter/event-emitter'

// default options when undefined:
const eventEmitter = new EventEmitter()

eventEmitter.emit('error', new Error('error message'))