child component property

components.child-component.js

import Ember from 'ember';
import { ChildMixin } from 'ember-composability-tools';

export default Ember.Component.extend(ChildMixin, {
  tagName: 'li'
});

components.parent-component.js

import Ember from 'ember';
import { ParentMixin } from 'ember-composability-tools';

export default Ember.Component.extend(ParentMixin, {
  didInsertParent() {
    this._super(...arguments);

    this.get('childComponents').forEach((child) => {
      console.log(child.get('disabled'));
    });
  }
});

controllers.application.js

import Ember from 'ember';

export default Ember.Controller.extend({
  appName: 'Ember Twiddle'
});

templates.application.hbs

<h1>Welcome to {{appName}}</h1>
<br>
<br>
{{#parent-component as |p|}}
  {{p.child}}
  {{p.child}}
  {{p.child}}
  {{p.child}}
  {{p.child}}
{{/parent-component}}
<br>
<br>

templates.components.child-component.hbs

child {{elementId}}

templates.components.parent-component.hbs

Parent component:
<ul>
{{yield (hash
  child=(component "child-component" disabled="hey" parentComponent=this)
)}}
</ul>

twiddle.json

{
  "version": "0.11.1",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "2.11.0",
    "ember-data": "2.11.0",
    "ember-template-compiler": "2.11.0",
    "ember-testing": "2.11.0"
  },
  "addons": {
    "ember-composability-tools": "0.0.8"
  }
}