Type-safe response from multi()

[smikula]

I'd love to see a type-safe return value from the multi() method on various APIs. I know this is easier said than done — I can't think of a way to do it when passing an array of selection strings — but I there are other ways it could work. Something like:

await torn.user.multi().basic().battlestats().attacks().fetch();

Or:

await torn.user.multi(request => request.basic().battlestats().attacks());

Or with a little ingenuity I think even this could work:

await torn.user.basic().battlestats().attacks();

What do you think? If you're interested, I'd be up for working on a PR.

[jgolla]

@smikula, I would be interested in seeing your ideas. I added the multi calls as more of an afterthought, so they don't fit in as well as the other calls.

[smikula]

I have a proof of concept idea in this PR: #318

Alternately, you could just define a big return type from multi with all properties there but optional. That's a little annoying to work with as a consumer, but way easier for the library to code!