Convert gatsby-theme-ui-layout to TypeScript

[epilande]

Convert gatsby-theme-ui-layout to TypeScript.

Related to #668.

Since this gets consumed as a Gatsby theme, I don't think it needs to be compiled.
I tested this out with gatsby-theme-ui-blog (which is still in JavaScript) and it works just like before 😃

[mxstbr]

Since this gets consumed as a Gatsby theme, I don't think it needs to be compiled.

Are Gatsby themes able to compile TypeScript? What if they use TypeScript options the package doesn't support? 🤔

[epilande]

@mxstbr oops I lied. I tried it out with a clean gatsby install and it didn’t work.. I thought it was magic :P

[jxnblk]

Sounds like it might make sense to leave the Gatsby plugins & themes in JS to avoid needing to compile them for the time being, right?

[epilande]

@jxnblk yeah, another option could be to set up gatsby-config with gatsby-plugin-typescript, though this package is bare bones and that it might not be worth it

[jxnblk]

My guess is that it might not be worth it for the time being. One (small) nice thing about shipping the source code is that users can view more human-readable code in node_modules, which also is nice for some potential tooling we could build for shadowing (if that makes sense).

If Gatsby supports .ts in plugins/themes in the future, then I think it could make sense to convert these over.

[epilande]

Yeah 💯 agree. Closing for now