Debugging code to help track down events that cause EventEmitter memory leaks in Node.js

debugeventemitter.js

//Is Node.js reporting warning messages like this?:
//
//  "Warning: Possible EventEmitter memory leak detected. 11 wakeup listeners added. Use emitter.setMaxListeners() to increase limit"
//
//The following code will intercept calls to addListener() and on() and print the type of event and generate an Error exception
//With a stack trace to help you find the cause

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

const originalAddListener = EventEmitter.prototype.addListener;

const addListener = function (type) {
  originalAddListener.apply(this, arguments);

  const numListeners = this.listeners(type).length;
  const max = typeof this._maxListeners === 'number' ? this._maxListeners : 10;

  if (max !== 0 && numListeners > max) {
    const error = new Error('Too many listeners of type "' + type + '" added to EventEmitter. Max is ' + max + " and we've added " + numListeners + '.');
    console.error(error);
    throw error;
  }

  return this;
};

EventEmitter.prototype.addListener = addListener;
EventEmitter.prototype.on = addListener;

Thank you! It really helps to debug my app!