Key

components.key-mounter\.js

import Component from '@ember/component';

export default Component.extend({
  tagName: '',
  key: undefined,
  keys: Ember.computed('key', function () {
    return [{ 
      key: String(this.get("key"))
    }];
  }).readOnly(),
});

components.my-component\.js

import Component from '@glimmer/component';

let someGlobalState = 0;

export default class extends Component {
  x = ++someGlobalState;
}

controllers.application\.js

import Controller from '@ember/controller';

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

	key = 0;

	init() {
    super.init()
    
    Ember.run.later(this, function cb() {
    		this.set("key", this.get("key") + 1);
        Ember.run.later(this, cb, 1000);
    }, 1000);
  }
}

templates.application\.hbs

{{#key-mounter key=this.key}}
  <MyComponent></MyComponent>
{{/key-mounter}}

templates.components.key-mounter\.hbs

{{#each keys key="key"}}{{yield}}{{/each}}

templates.components.my-component\.hbs

<h1>{{this.x}}</h1>

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"
  }
}