debugging-1

components.my-component\.js

import Component from "@ember/component";
import { action }  from "@ember/object";

export default Component.extend({
  time: "forever",
  loved: false,
  
  showSomeLove: Ember.computed("loved", "time", function() {
    return this.loved ? true : false;
  }),
  
  showSomeLoveChanged: Ember.observer("showSomeLove", function() {
    debugger;
  })
});

controllers.application\.js

import Controller from '@ember/controller';

export default class ApplicationController extends Controller {
  appName = 'Ember Twiddle';
}

templates.application\.hbs

{{my-component}}

templates.components.my-component\.hbs

<p>Show love ? {{input type="checkbox" input=(action (mut loved) value="target.checked")}}</p>

{{#if showSomeLove}}
  ❤️
{{/if}}

twiddle\.json

{
  "version": "0.17.0",
  "EmberENV": {
    "FEATURES": {},
    "_TEMPLATE_ONLY_GLIMMER_COMPONENTS": false,
    "_APPLICATION_TEMPLATE_WRAPPER": true,
    "_JQUERY_INTEGRATION": true
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.js",
    "ember": "3.12.2",
    "ember-template-compiler": "3.12.2",
    "ember-testing": "3.12.2"
  },
  "addons": {
    "@glimmer/component": "1.0.0"
  }
}