New Twiddle

components.my-component\.js

import Component from '@glimmer/component';
import { action } from '@ember/object';
import { inject as service } from '@ember/service';

export default class MyComponent extends Component {
}

controllers.application\.js

import Controller from '@ember/controller';

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

controllers.my-route\.js

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

export default class MyRouteController extends Controller {
  @tracked x = [];
	get jsonX() {
    return JSON.stringify(this.x);
  }
  
  @action
  increment() {
    this.x.pushObject(this.x.length);
  }
}

router\.js

import EmberRouter from '@ember/routing/router';
import config from './config/environment';

const Router = EmberRouter.extend({
  location: 'none',
  rootURL: config.rootURL
});

Router.map(function() {
  this.route('my-route');
});

export default Router;

routes.my-route\.js

import Route from '@ember/routing/route';

export default Route.extend({
  queryParams: {
    x: { refreshModel: true },
    y: { refreshModel: true }
  },
  
  model(params) {
    return JSON.stringify(params);
  }
});

templates.application\.hbs

<h1>Welcome to {{this.appName}}</h1>
<br>
<br>
<LinkTo @route="my-route" >My route</LinkTo><br>
{{outlet}}
<br>
<br>

templates.components.my-component\.hbs

{{@x}}
<button {{on "click" @increment}}>Increment</button>

templates.my-route\.hbs

This is the template for my-route
<div>
x: {{this.x}}
y: {{this.y}}
</div>
model: {{@model}}
<MyComponent @x={{this.x}} @increment={{this.increment}}/>
<br>
JSON here:
{{this.jsonX}}

twiddle\.json

{
  "version": "0.17.0",
  "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/3.3.1/jquery.js",
    "ember": "3.17.0",
    "ember-template-compiler": "3.17.0",
    "ember-testing": "3.17.0"
  },
  "addons": {
    "@glimmer/component": "1.0.0"
  }
}