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We have PureScript which is statically typed, pure functional language compiling to JS, can't it be adopted for React Native development somehow?

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Yes, it can, although I can't say how usable those bindings are.

[0] https://github.com/arthur-xavier/purescript-react-native

[1] https://github.com/hoodunit/purescript-react-native

You really need to check out Elm.

It's an ML-like language with built in functional reactive framework similar to React, but built to work naturally with the language rather than requiring the FFI binding you'd need if you use Purescript.

Elm's type systems is really constrained compared to PureScript's. It's great for people coming from JavaScript, but not so much for those coming from Haskell.

Also, you still need FFI in Elm. elm-lang/virtual-dom is basically just a wrapper around the native virtual-dom library. Also, afaik there's nothing like react native for virtual-dom.

I was under the impression that Elm rolls it's own virtual-dom?

iirc they scrapped that in favor of virtual-dom a long time ago.

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