`hasBlock` deprecation, documenting `(has-block` and `(has-block-params`

[mixonic]

In working on Octane documentation I realized the following:

• hasBlock behaves as a keyword in templates, still exists
• (has-block is a helper which was added intending to replace hasBlock. It is suggested in the guides as best practice but has no API documentation as an Ember helper.
• (has-block-params is often mentioned by VM developers when (has-block is being discussed, however this is also not documented as a public API.
• AFAICT there has been no RFC that got us here

I'd like to propose an RFC which would resolve this loose end:

• RFC would document/describe the (has-block API, including use for inverse blocks.
• RFC would document/describe the (has-block-params API, including use for inverse blocks.
• RFC would require that we document the same as API.
• RFC would propose and document a deprecation for hasBlock

This is related to #460 (@wycats on named blocks) as I believe these APIs will have a lot more use and prominence once named blocks land.

[knownasilya]

Looks like the documentation has been updated here emberjs/ember.js#17767

[MariannaAtPlay]

Hello,
has hasBlock been deprecated?
Trying to understand the difference btw hasBlock and has-block.

[knownasilya]

It hasn't, but should be. From a user's perspective it seems like there is no difference.

[wycats]

@knownasilya that is correct. @rwjblue should we open a deprecation RFC? Or is there already one?

[chancancode]

I think we may not want to touch this while we are working towards template imports? While I do think this will stay a keyword and doesn't make sense to import it, having everything else in camelCase while keeping this in d-a-s-h may be strange.

[wycats]

@chancancode I agree with this. It's possible that we'll want to use dash-case for keywords, but I agree that we can reserve that conversation for later.

[wycats]

As a side note: we could consider the new vscode deprecation feature to mark features that we want to discourage. It has pretty nice UI.

[bertdeblock]

There is now an RFC for deprecating hasBlock and hasBlockParams.

[mixonic]

Closing as I consider this resolved in #689!