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Comments (2)

thomasjm avatar thomasjm commented on August 21, 2024

Well, like the error says, it doesn't have an instance for TypeScript (Identity a). I added one and it works:

{-# LANGUAGE DeriveGeneric #-}
{-# LANGUAGE FlexibleContexts #-}
{-# LANGUAGE KindSignatures #-}
{-# LANGUAGE ScopedTypeVariables #-}
{-# LANGUAGE TemplateHaskell #-}
{-# LANGUAGE TypeApplications #-}

module Test () where

import qualified Data.Aeson as Aeson
import qualified Data.Aeson.TypeScript.TH as TS
import           Data.Functor.Identity
import           Data.Proxy
import           Data.Typeable
import           GHC.Generics (Generic)

data Foo a = Foo (Identity (Foo a))
  deriving (Generic)

instance (Typeable a, TS.TypeScript a) => TS.TypeScript (Identity a) where
  getTypeScriptType _ = TS.getTypeScriptType (Proxy @a)

$(TS.deriveTypeScript Aeson.defaultOptions ''Foo)

main = do
  putStrLn (TS.formatTSDeclarations (TS.getTypeScriptDeclarations @(Foo TS.T) Proxy))

from aeson-typescript.

langston-barrett avatar langston-barrett commented on August 21, 2024

I see, thank you! It wasn't clear to me from the message Could not deduce (TypeScript (Identity (Foo T))) that what was needed was an instance TypeScript (Identity a), the presence of T threw me off.

from aeson-typescript.

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