Once-Multi-EventListener

Once-Multi-EventListener is a NodeJS package used to add multiple event listeners to an emitter only for one usage. This means that when one of the events is emitted all the listeners are dropped.

Installation

npm i -S once-multi-eventlistener

Usage

onceMultiEventListener(emitter, {
    event1: (a, b) => {
        console.log('event1 emitted.');
    },
    event2: (c) => {
        console.log('event2 emitted.');
    },
    event3: () => {
        console.log('event3 emitted.');
    }
});

Example

const net = require('net');
const onceMultiEventListener = require('once-multi-eventlistener');

const socket = new net.Socket();
/**
 * Listen multiple events on this socket for once
 */
onceMultiEventListener(
  socket,
  {
    'data': (data) => {
      console.log('data event emitted. Current events:', socket.eventNames());
      socket.destroy();
    },
    'error': (err) => {
      console.log('error event emitted. Current events:', socket.eventNames());
      socket.destroy();
    },
    'close': () => {
      console.log('close event emitted. Current events:', socket.eventNames());
      socket.destroy();
    }
  }
);
/**
 * Log listening events on this socket
 */
console.log('Current events:', socket.eventNames()); // [..., 'data', 'error', 'close']
/**
 * Try to connect 127.0.0.1 on a closed port
 * (error event should emitted)
 */
socket.connect(88, '127.0.0.1');