New Twiddle

components.my-component\.js

import Component from '@glimmer/component';

export default class extends Component {
  get bob() {
    return this.page.currentPage;
  }
  
  get page() {
    return this.args.page;
  }
}

controllers.application\.js

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

export default class ApplicationController extends Controller {
  appName = 'Ember Twiddle';
  currentPage = 0;

  @action doIt() {
   this.incrementProperty('currentPage');
  }
}

routes.application\.js

import EmberObject from '@ember/object';
import Route from '@ember/routing/route';
import { action } from '@ember/object';
import { readOnly } from '@ember/object/computed';

class PaginatedFoo extends EmberObject {
  currentPage = 0;

  @action
  loadNextPage() {
    this.set('currentPage', this.currentPage + 1);
  }
}

export default Route.extend({
  model() {
    return PaginatedFoo.create();
  }
});

templates.application\.hbs

<MyComponent @page={{this.model}}/>

<button {{on 'click' this.model.loadNextPage}}>Go</button>

{{log this.model.currentPage}}

templates.components.my-component\.hbs

Hello {{this.bob}}

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"
  }
}