Proxy test

controllers.application\.js

import Controller from '@ember/controller';
import EmberObject from '@ember/object';

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

	get bob() {
    return new Proxy({ name: 'foo' }, makeHandler('bob'));
  }

	get bill() {
    return new Proxy(EmberObject.create({ name: 'bar' }), makeHandler('bill'));
  }
}

function makeHandler(name) {
  return {
    get(obj, prop) {
      console.log(`[${name}] Getting ${typeof prop} ${prop}`);
      if (prop in obj) {
        return obj[prop];
      }
      console.log(`[${name}] custom logic necessary to get '${prop}'`);
      return;
    }
  };
}

templates.application\.hbs

<h1>Proxy test</h1>
<h2>POJO (bob)</h2>
{{bob.name}}
<h2>EmberObject (bill)</h2>
{{bill.name}}

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": "3.17.0",
    "ember-template-compiler": "3.17.0",
    "ember-testing": "3.17.0"
  },
  "addons": {
    "@glimmer/component": "1.0.0"
  }
}