// Creating a constant reference of EventEmitter
const EventEmittter = require('events');

// Initializing instance of EventEmitter
const emitter = new EventEmitter();

emitter.addListener(eventName, listener);

emitter.emit(eventName, arg1,arg2,...)

// Importing the events module
const EventEmitter = require('events');
 
// Initializing instance of EventEmitter to be used
const emitter = new EventEmitter();
 
// Adding listener to the event
emitter.addListener('welcomeEvent', (name) => {
    console.log("welcome " + name);
});
 
// Emitting the welcomeEvent
emitter.emit('welcomeEvent', "Geek");

welcome Geek

// For removing any single listener form the event
emitter.removeListener(eventName, listener)

// For removing all listeners of the event
emitter.removeAllListeners(eventName)

// Importing the events module
const EventEmitter = require('events');
 
// Initializing instance of EventEmitter to be used
const emitter = new EventEmitter();
 
// Creating events
const person1 = (msg) => {
    console.log("Message from person1: " + msg);
};
 
const person2 = (msg) => {
    console.log("Message from person2: " + msg);
};
 
// Registering person1 and person2 with the printEvent
emitter.addListener('printEvent', person1);
emitter.addListener('printEvent', person2);
 
// Triggering the created event
emitter.emit('printEvent', "Event occurred");
 
// Removing all the listeners associated with the event
emitter.removeAllListeners('printEvent');
 
// Triggering the event again but no output
// as all listeners are removed
emitter.emit('printEvent', "Event occurred");

Message from person1: Event occurred
Message from person2: Event occurred