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You might be interested in `fp-ts` (and the related `io-ts`).

https://gcanti.github.io/fp-ts/

https://gcanti.github.io/io-ts/

I’ve never gone so far as to pull in fp-ts into a work codebase because it often doesn’t feel that it’s worth the headache of arguing for it.

However, I check back in from time to time and was recently confused as to whether or not the community has moved onto effect-ts as it seems effect consumed the fp project?

Do you have any context on that?

No sorry, I'm not tuned in to typescript at the moment. I've mostly used fp-ts in the past because I haven't found a better runtime type system than io-ts, but I haven't written typescript in a while.

Mostly responding so people with better context don't wait on me.

With TypeScript a nullable return type effectively is an ADT.

But it's not Either / Result because there no error information on null

Then return something else.

We can and do.