Passing actions from services, take 2

components.child-component.js

import Ember from 'ember';

export default Ember.Component.extend({
});

components.parent-component.js

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

export default Component.extend({
  alert: service(),
  // component implementation
});

controllers.application.js

import Ember from 'ember';

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

services.alert.js

// alert.js
import Service from '@ember/service';

export default Ember.Service.extend({
  actions: {
    thisIsAServiceAction() {
      alert('service action')
    }
  },
  thisIsANormalMethod() {
      alert('service method, not an action')
  }
});

templates.application.hbs

<h2>Things that work:</h2>
{{parent-component}}
<br>

templates.components.child-component.hbs

<button {{action onConfirm}}>click: {{yield}}</button>

templates.components.parent-component.hbs

We can pass the service action method to a block form child component and it will work:

<!-- parent-component.hbs -->
{{#child-component onConfirm=(action "thisIsAServiceAction" target=alert)}}
yielded content
{{/child-component}}
<br>

We can pass the service action to a non block component and it will work:
{{child-component onConfirm=(action "thisIsAServiceAction" target=alert)}}
<br>

We can pass a _normal service method_ (non-action) as a variable:
{{child-component onConfirm=alert.thisIsANormalMethod}}
<br>

We can call a _normal service method_ (non-action) directly in the parent/home component:
<button {{action "thisIsANormalMethod" target=alert}}>parent component button</button>

<h2>Things that don't work</h2>

We cannot call a service action directly on the parent component. This does not work:
<button {{action "thisIsAServiceAction" target=alert}}>parent component button</button>
<br><br>

We cannot pass a regular method to any child component. These two will not work:

{{child-component onConfirm=(action "thisIsANormalMethod" target=alert)}}

{{#child-component onConfirm=(action "thisIsANormalMethod" target=alert)}}
yielded content
{{/child-component}}

twiddle.json

{
  "version": "0.14.1",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.js",
    "ember": "2.18.2",
    "ember-template-compiler": "2.18.2",
    "ember-testing": "2.18.2"
  },
  "addons": {
    "ember-data": "2.18.2"
  }
}