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I use https://github.com/1Password/typeshare it has it's quirks, but works nicely

I use aeson-typescript but it is broken in subtle ways

https://hackage.haskell.org/package/aeson-typescript

I switched to utoipa as I also needed an Open api client generator.

One neat thing is that I generate the complete client with a bit of python code. Then I use Knip to find unused exports in my Typescript project. I actually found some unused backend methods that were left over from refactoring.