Author Built-In Blueprints in TypeScript

[cafreeman]

In order to support both TypeScript and JavaScript as official languages in Ember, we should enable blueprints to be written in TypeScript and (optionally) transformed to JavaScript. We should also convert all of the existing built-in blueprints to TypeScript to take advantage of this new functionality and lay the groundwork for future TypeScript inclusion efforts.

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[rwjblue]

Thanks for working on this @cafreeman!

[wagenet]

This seems like a great idea! I look forward to reviewing it in detail.

[wagenet]

I'm 100% on board with this and, at this point, don't have any concerns or further suggestions!

[kategengler]

"How we teach this" should probably cover authoring blueprints, in as much as they are covered on the cli guides.

See https://cli.emberjs.com/release/advanced-use/blueprints/

[rwjblue]

We discussed this in today's ember-cli team meeting, and are generally in favor of moving forward. There were a few things called out during that discussion that we think needs to be updated:

• "How we teach this" should include information about updating the blueprint authoring guides (see Author Built-In Blueprints in TypeScript #776 (comment))
• We should explicitly add the --typescript flag (supporting blueprint generation with typescript if the underlying blueprint was actually authored in typescript). We can also call out that adding "typescript": true to .ember-cli is a convenient way to ensure that users in a project get typescript blueprints whenever possible (it could even suggest that the ember-cli-typescript blueprint be updated to add that for folks automatically).

@cafreeman - Once those tweaks are made, I think this will be ready for another look.

[cafreeman]

Thanks for the feedback @kategengler and @rwjblue! I've just pushed an update that should address both issues that were brought up. Let me know if you've got any other comments!

[rwjblue]

Thanks for the updates @cafreeman!! We discussed this at the last ember-cli team meeting, and are moving this into final comment period.