node js event using the node event sdlib

event in node.js

const events = require('events');
let eventEmitter = new events.EventEmitter();

//Create an event handler:
let myEventHandler = function () {
  console.log('I hear a scream!');
}

//Assign the event handler to an event:
eventEmitter.on('scream', myEventHandler);

//Fire the 'scream' event:
eventEmitter.emit('scream');