New Twiddle

controllers.application.js

import Ember from 'ember';

export default Ember.Controller.extend({
  appName: 'Ember Twiddle'
});

controllers.index.js

import Ember from 'ember';
import Controller from '@ember/controller';
import {inject as service} from '@ember/service';
import {get} from '@ember/object';

export default Controller.extend({
  modalsManager: service(),
  actions: {
    showAlertModal() {
      const options = {
        title: 'Custom Alert Modal Title',
        body: 'Custom Alert Modal Body',
      };
      get(this, 'modalsManager')
        .alert(options);
    }
  }
});

styles.app.scss

@import 'ember-paper';

templates.application.hbs

<h1>Welcome to {{appName}}</h1>
{{outlet}}
{{modals-container}}

templates.index.hbs

{{#paper-button
	raised=true
	class="alert-modal"
	onClick=(action "showAlertModal")}}
	Alert Modal
{{/paper-button}}

twiddle.json

{
  "version": "0.15.1",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.js",
    "ember": "3.4.3",
    "ember-template-compiler": "3.4.3",
    "ember-testing": "3.4.3",
    "sass": "1.20.1"
  },
  "addons": {
    "ember-data": "3.4.2",
    "ember-paper": "1.0.0-beta.24",
    "ember-paper-modals-manager": "1.4.0",
    "ember-cli-sass": "10.0.1"
  }
}