Tagless Components that use a service to toggle eachother

components.service-toggled-thingy.js

import Ember from 'ember';

export default Ember.Component.extend({
  tagName: '',
  shower: Ember.inject.service('shower'),
  isVisible: Ember.computed.alias('shower.shouldShow'),
});

components.toggler-thingy.js

import Ember from 'ember';

export default Ember.Component.extend({
  tagName: '',
  shower: Ember.inject.service('shower'),
  actions: {
    toggleShow() {
      this.get('shower').toggleShow();
    },
  }
});

controllers.application.js

import Ember from 'ember';

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

services.shower.js

import Ember from 'ember';

export default Ember.Service.extend({
  shouldShow: false,
  toggleShow() {
    this.toggleProperty('shouldShow');
  }
});

templates.application.hbs

<h1>Welcome to {{appName}}</h1>
<br>
<br>

{{#toggler-thingy as |toggleShow|}}
  <button {{action toggleShow}}>toggle</button>
{{/toggler-thingy}}

{{#service-toggled-thingy}}
  <h2>Helloooooooooo!</h2>
{{/service-toggled-thingy}}

templates.components.service-toggled-thingy.hbs

{{#if isVisible}}
  {{yield}}
{{/if}}

templates.components.toggler-thingy.hbs

{{yield (action "toggleShow")}}

twiddle.json

{
  "version": "0.12.1",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "2.12.0",
    "ember-template-compiler": "2.12.0",
    "ember-testing": "2.12.0"
  },
  "addons": {
    "ember-data": "2.12.1"
  }
}