leak

components.my-component.js

import Ember from 'ember';

export default Ember.Component.extend({
  didInsertElement() {
    this.set('$parentEl', Ember.$('.parent'));
    this.get('$parentEl').on('click', () => { console.log('parent clicked'); })
  },
  willDestroyElement() {
    this.sendAction('isParentDestroyed');
    console.log('child destroying');
    console.log('parent el', this.get('$parentEl'))
  }
});

components.parent-component.js

import Ember from 'ember';

export default Ember.Component.extend({
  classNames: ['parent'],
  didInsertElement() {
    this.sendAction('storeElement', this.$());
  },
  willDestroyElement() {
    console.log('parent destroying');
  },
  actions: {
    amIDestroyed() {
      console.log(this.get('isDestroying'), this.get('isDestroyed'));
    }
  }
});

controllers.application.js

import Ember from 'ember';

export default Ember.Controller.extend({
  appName: 'Ember Twiddle',
  showParent: true,
  
  actions: {
    toggleParent() {
      this.toggleProperty('showParent');
    },
    storeElement($el) {
      console.log('storing', $el);
      this.set('storedElement', $el);
    },
    
    clickStoredElement() {
     	this.get('storedElement').click();
    }
  }
});

templates.application.hbs

<h1>Welcome to {{appName}}</h1>
<br>
<br>
{{outlet}}
{{#if showParent}}
  {{parent-component storeElement=(action 'storeElement')}}
{{/if}}
<button onclick={{action 'toggleParent'}}>
  toggle parent
</button>
<button onclick={{action 'clickStoredElement'}}>
  click stored element
</button>
<br>
<br>

templates.components.my-component.hbs

{{yield}}
My Component

templates.components.parent-component.hbs

{{yield}}
{{my-component isParentDestroyed=(action 'amIDestroyed')}}

twiddle.json

{
  "version": "0.12.1",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "2.12.0",
    "ember-template-compiler": "2.12.0",
    "ember-testing": "2.12.0"
  },
  "addons": {
    "ember-data": "2.12.1"
  }
}