Support gjs/gts / <template>

[NullVoxPopuli]

The current babel config doesn't allow gjs/gts.

We should add that babel plugin.
The babel plugin lives in the dist'd files from: https://github.com/ember-template-imports/ember-template-imports

[ef4]

This requires more than just the babel plugin, because babel can't parse GJS / GTS until after a preprocessing step. It's going to require a dedicated rollup plugin.

The preprocessor lives here: https://github.com/ember-template-imports/ember-template-imports/blob/c1dfa62b2de91775b1a353d914dae049b88af6cc/src/preprocess-embedded-templates.ts#L180

At the moment, the output format of the preprocessor is an implementation detail between the preprocessor and the corresponding babel plugin. However, I don't think we should keep things that way. I think we should move ahead with something like https://github.com/emberjs/rfcs/blob/35a9e8150596a7bf37034b095c3c574eb43c0e22/text/0813-template-layering.md which would give us a streamlined pure-JS representation of the <template> syntax.

Then the preprocessor gets simpler and the babel implementation can move directly into babel-plugin-ember-templat-compilation.

[NullVoxPopuli]

any chance that RFC can get on the agenda for this week's core team meeting <3

[NullVoxPopuli]

Demo: https://github.com/dfreeman/fccts-in-v2/blob/main/fcct-support/rollup-plugin.js

Thanks, @dfreeman !

[NullVoxPopuli]

I think this is implemented now, in 2.4.

There are still some safeguards to explore, such as #187

but that's def a polish thing.

I'd declare this done, closing.