Glimmer2 Compatibility

[cowboyd]

Ember let test suite should pass against glimmer enabled ember, but falls over.

https://travis-ci.org/thefrontside/ember-let/jobs/156027764

[rwjblue]

I've got a spike on this, though I'm unsure how I feel about it 😝

[mitchlloyd]

I'm just going to drop this here. Please don't tell any Ember core team members about it. https://ember-twiddle.com/16243ed7e17b2cc5bb57b4322aa1ed71?openFiles=templates.application.hbs%2C

[rwjblue]

Haha, indeed I am aware 😉

It still has the super unexpected issues of not rendering the block if you happen to use something that evaluates to falsey (false, undefined, null, [], etc) in the template. That is actually pretty surprising to most folks these days.

Honestly, I am pretty excited about the newer inline form. I want to continue experimenting then convince @cowboyd to write an RFC to make it part of Ember... 😈

[rwjblue]

FWIW, I have a pretty gnarly spike on fixing this in canary/alpha builds with Glimmer but it is pretty annoying. I tried to do some cleanup in a recent Ember PR to make this a bit easier/nicer.

[mitchlloyd]

Ah yes, not rendering the block when the first value is falsey definitely makes that a non-starter.