New Twiddle

controllers.application\.js

import Controller from '@ember/controller';
import { Changeset } from 'ember-changeset';

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

  get changeset() {
    const user = {
      firstName: 'foo', 
      lastName: 'bar'
    };
    
    return Changeset(user);
  }
}

templates.application\.hbs

<form>
  <input value={{this.changeset.firstName}} />
</form>

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",
    "ember-changeset": "3.15.0"
  },
  "addons": {
    "@glimmer/component": "1.0.0"
  }
}