Add initial typescript configuration to addon project

[SanderKnauff]

This adds Typescript support to the addon project.
At this moment, it does not touch the test-app and docs projects yet.

[simonihmig]

LGTM! Any reason to have this tagged as WIP actually?

We don't expose the types in the published package yet, that stuff is still missing. But I assume this was intentional, to only expose the types when we are ready to?

[SanderKnauff]

LGTM! Any reason to have this tagged as WIP actually?

We don't expose the types in the published package yet, that stuff is still missing. But I assume this was intentional, to only expose the types when we are ready to?

I put it as WIP because I wasn't yet sure if I had missed anything, such as the typesVersions object that I actually did miss. 😅

Shall I add it in? I'm not sure if it would be a big issue if we ship partial types until we're completely done.

[simonihmig]

I'm not sure if it would be a big issue if we ship partial types until we're completely done.

Yeah, probably it doesn't hurt really. So we can add that I guess!

[simonihmig]

I think we will need some more tweaking of the config. But this is better done when we actually have some TS code to play with. I am currently working on some initial TS conversion, so will probably bring up some tweaks with the next PR!

So let's get this merged first! Thanks @SanderKnauff!

[simonihmig]

so will probably bring up some tweaks with the next PR

See e641f84