Inheriting from EventEmitter section requires events and incorrectly assigns to EventEmitter object.

const EventEmitter = require('events');

It should be

const EventEmitter = require('events').EventEmitter;

Even while introducing EventEmitter class, it mentions var EventEmitter = require('events'); which should have been var EventEmitter = require('events').EventEmitter;

Run the code otherwise complains TypeError: Object prototype may only be an Object or null, which is understandable as object returned by simply requiring events does not have prototype property.