Decorator Demo

controllers.application\.js

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

function logged(target, key, descriptor) {
  let { initializer } = descriptor;
  
  let get = function() {
    console.log(`Get ${key}`); // DOES NOT LOG!
    return initializer();
  };
  let set = function(value) {
    console.log(`Set ${key}`); // DOES NOT LOG!
    return ;
  };
  
  console.log(descriptor);
  
  let newDescriptor = {
    get,
    set,
    configurable: false,
    enumerable: false,
    //writable: false,
    //value: undefined,
    //initializer: undefined,
  };
  
  console.log(newDescriptor);
    
  return newDescriptor;
}

class Foo {
  @logged foobar = 'FOOBAR';
}

export default class ApplicationController extends Controller {
  init() {
    super.init(...arguments);
    let foo = new Foo();
    console.log(`Result: ${foo.foobar}`);
  }
}

templates.application\.hbs

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

twiddle\.json

{
  "version": "0.17.1",
  "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/3.5.1/jquery.js",
    "ember": "3.18.1",
    "ember-template-compiler": "3.18.1",
    "ember-testing": "3.18.1"
  },
  "addons": {
    "@glimmer/component": "1.0.0"
  }
}