EventEmitter.listeners() should not auto-create this._events

[bnoordhuis]

This test should pass but doesn't because .listeners() has side effects.

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

var e = new EventEmitter;

e.listeners('foo');
assert(typeof e._events == 'undefined');

e.on('foo', assert.fail);
e.listeners('bar');
assert(typeof e._events['bar'] == 'undefined');

[TooTallNate]

What should listeners() return in that case then?

[bnoordhuis]

An empty array. It does a .slice() now in master so that's okay but it shouldn't create the _events property.

[isaacs]

Agreed. First one to review #3825 gets a virtual high five.

[bnoordhuis]

Fixed in 50c7d80.

[ivanstoyanov]

Hi, it would be fantastic if you include this in the stable branch too. It is quite a memory leak with my kind of usage.

[TooTallNate]

@ivanstoyanov Not gonna happen, this is a breaking API change.