Tracked Dirtying

controllers.application\.js

import Controller from '@ember/controller';
import { tracked } from '@glimmer/tracking';

let renderCount = 0;

function trackedWithCache(target, key, desc) {
  let _v;
  let d = tracked(target, key, desc);

  return {
    configurable: true,
    enumerable: true,
    get() {
      _v = d.get.call(this);
      return _v;
    },
    set(v) {
      if (v !== v) {
        d.set.call(this, v);
      }
    }
  }
}

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

  constructor() {
    super(...arguments);
    setInterval(() => {
      console.count('updated');
      this.myBool = false;
    }, 1000);
  }

  @trackedWithCache myBool = false;

  get trackedCount() {
    this.myBool; // subscribe
    return ++renderCount;
  }

  get count() {
    return ++renderCount;
  }
}

templates.application\.hbs

<h1>Welcome to {{this.appName}}</h1>
<br>
MyBool is {{if this.myBool 'true' ' false'}}
<br>
Render Count is: {{this.trackedCount}}
<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"
  }
}