Controller properties unavailable in subexpressions in ember-cli-async-button's parameters

[lolmaus]

In my page controller I have created the following property:

foo: true

Now, in my page template I'm doing this:

{{ ember-cli-async-button default=(if foo 'Hello' 'World') }}

A button with no text as rendered!

At the same time, these work fine:

{{ ember-cli-async-button default=(if true 'Hello' 'World') }} -- rendes button with `Hello`
{{ ember-cli-async-button default=foo }} -- rendes button with `true`

I've tried reproducing the problem with a boilerplate component.

I have created an app/templates/components/x-bar.hbs file with the following content:

{{ default }}

Now, in my page template I'm doing this:

{{ x-bar default=(if foo 'Hello' 'World') }}

It renders as Hello. Thus I conclude that the issue is specific to ember-cli-async-button.

[lolmaus]

The problem also exists for attribute bindings, e. g. disabled.

[bcardarella]

@lolmaus I suspect this issue is because we are proxying to the component through a helper and your options are being washed out. With emberjs/ember.js#11028 we should be able to support what one want once this gets into Release Ember

[lolmaus]

You're right. I did this and it worked!

`import AsyncButton from 'ember-cli-async-button/components/async-button'`

AssButtComponent = AsyncButton.extend()

`export default AssButtComponent`