Leaking Listener Test

components.my-clock.js

import Ember from 'ember';

export default Ember.Component.extend({
  time: null,
  _handler: null,
  didInsertElement() {
    this._super(...arguments);
    console.log(this.time);
    this.set('_handler', function() {
			console.log('wiggity');
    });
    this.element.addEventListener('click', this.get('_handler'));
  },
  willDestroyElement() {
    this.element.removeEventListener('click', this.get('_handler'));
    this.set('_handler', null);
  }
});

controllers.application.js

import Ember from 'ember';

export default Ember.Controller.extend({
  appName: 'Ember Twiddle',
  time: 0,
  timeIsChanging: true,
  init() {
    this._super(...arguments);
    setInterval(() => this.increment(), 200);
  },
  increment() {
    Ember.set(this, 'timeIsSet', false);
    Ember.set(this, 'time', Ember.get(this, 'time') + 1);
		Ember.run.next(() => {
	    Ember.set(this, 'timeIsSet', true);
    });
  }
});

templates.application.hbs

<h1>Welcome to {{appName}}</h1>
<br>
<br>
{{outlet}}
{{#if timeIsSet}}
  {{my-clock time=time}}
{{/if}}
<br>
<br>

templates.components.my-clock.hbs

{{yield}}
{{time}}

twiddle.json

{
  "version": "0.15.1",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.js",
    "ember": "3.4.3",
    "ember-template-compiler": "3.4.3",
    "ember-testing": "3.4.3"
  },
  "addons": {
    "ember-data": "3.4.2"
  }
}