New Twiddle

component-1.component.js

import Ember from 'ember';

export default Ember.Component.extend({
});

component-1.template.hbs

{{yield}}

Component 1 - isPrinting: {{isPrinting}}

{{component-2 isPrinting=isPrinting}}

component-2.component.js

import Ember from 'ember';

export default Ember.Component.extend({
});

component-2.template.hbs

{{yield}}

Component 2 - isPrinting: {{isPrinting}}

controllers.application.js

import Ember from 'ember';

export default Ember.Controller.extend({
  appName: 'Ember Twiddle',
  componentName: 'component-1',
});

templates.application.hbs

<h1>Welcome to {{appName}}</h1>
<br>
<br>
{{outlet}}
<br>
<br>

{{component componentName foo=bar isPrinting=true}}

twiddle.json

{
  "version": "0.15.1",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": true,
    "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"
  }
}