New Twiddle

components.test-me\.js

import Component from '@glimmer/component';
import { tracked } from "@glimmer/tracking";
import { action } from '@ember/object';

class WithTrackedValue {
  @tracked value = null;
}

export default class extends Component {
	array = [];

  constructor(owner, args) {
    super(owner, args);
    this.array = [new WithTrackedValue(), new WithTrackedValue()];
  }

  get isEmpty() {
    return this.array.any(({ value }) => value);
  }

	@action
	setSomeValue() {
    this.array[0].value = 123;
  }
}

controllers.application\.js

import Controller from '@ember/controller';

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

templates.application\.hbs

<TestMe />

templates.components.test-me\.hbs

At least one value is set {{this.isEmpty}}
<button {{on "click" this.setSomeValue}}>Set some value</button>

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"
  }
}