Listen to All Emitted Events in Node.js

Question

In Node.js is there any way to listen to all events emitted by an EventEmitter object?

e.g., can you do something like...

event_emitter.on(\         


        

Answer 1

This is based on the answer that Martin provided above. I'm a bit new to node, so I needed to work out his answer for myself. The method at the end, logAllEmitterEvents is the important bit.

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

function emitHungryAnimalEvents()
{
    hungryAnimalEventEmitter.emit("HungryCat");
    hungryAnimalEventEmitter.emit("HungryDog");
    hungryAnimalEventEmitter.emit("Fed");
}

var meow = function meow()
{
  console.log('meow meow meow');
}

hungryAnimalEventEmitter.on('HungryCat', meow);

logAllEmitterEvents(hungryAnimalEventEmitter);

emitHungryAnimalEvents();

function logAllEmitterEvents(eventEmitter)
{
    var emitToLog = eventEmitter.emit;

    eventEmitter.emit = function () {
        var event = arguments[0];
        console.log("event emitted: " + event);
        emitToLog.apply(eventEmitter, arguments);
    }
}