New Twiddle

controllers.application\.js

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

export default class ApplicationController extends Controller {

	@tracked show = false
	@tracked twoValue = 'two'

  @action toggleVisibility() {
    this.show = !this.show
  }

















	init() {
    super.init()
    
    const script = document.createElement('script')
    script.type = 'module'
    script.src = 'https://unpkg.com/@esri/calcite-components/dist/calcite/calcite.esm.js'
    document.head.appendChild(script)
    
    const link = document.createElement('link')
    link.rel = 'stylesheet'
    link.href = 'https://unpkg.com/@esri/calcite-components/dist/calcite/calcite.css'
    document.head.appendChild(link)
  }
}

templates.application\.hbs

<p>
	<button {{on 'click' this.toggleVisibility}}>Show/hide</button>
</p>
{{#if show}}
  <p>
    <calcite-select>
      <calcite-option value="one">one</calcite-option>
      <calcite-option value={{this.twoValue}}>{{this.twoValue}}</calcite-option>
    </calcite-select>
  </p>
{{/if}}

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"
  }
}