New Twiddle

components.app\.js

import Component from '@glimmer/component';

export default class extends Component {
}

components.user\.js

import Component from '@glimmer/component';

export default class extends Component {
}

controllers.application\.js

import Controller from '@ember/controller';
import { inject as service } from '@ember/service';
import { tracked } from 'tracked-built-ins';
import { set } from '@ember/object';

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

  user = tracked({
    fullname: '',
    profile: '',
  });


  constructor() {
    super(...arguments);
    
    this.pretendQueryRecord();
  }

  async pretendQueryRecord() {
    await new Promise(resolve => setTimeout(resolve, 100)); // fake network
    
    const fullname = `first last`;
    this.user.fullname = fullname;
    this.user.profile = 'some url';
  }
}

models.user\.js

import Model from 'ember-data/model';
import attr from 'ember-data/attr';
/*
import attr from 'ember-data/attr';
import { belongsTo, hasMany } from 'ember-data/relationships';
*/

export default class extends Model {
  @attr('string') firstName;
  @attr('string') lastName;
  @attr() profile;
}

templates.application\.hbs

<h1>Welcome to {{this.appName}}</h1>
<br>
<br>
<App @user={{this.user}} />
<br>
<br>
{{this.error}}

templates.components.app\.hbs

<h1> SOME EXAMPLE </h1>

<User @user={{@user}}/>

templates.components.user\.hbs

<h2>USer details </h2>
name: {{@user.fullname}}
<br>
profile: {{@user.profile}}

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",
    "ember-data": "3.18.0",
    "tracked-built-ins": "1.1.1"
  }
}