Comments (2)
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.
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.
Related Issues (18)
- Extend the tests to cover all combinations of Aeson encoding options HOT 1
- Handwritten TypeScript instances for higher-order ADTs HOT 2
- [RFC] - Format Sum types HOT 4
- Stackage nightly test failure HOT 2
- Example doesn't seem to work HOT 9
- Fails to build with GHC 9.0.1 HOT 1
- Always generate "tagged" unions HOT 2
- Extend Map instance to handle `ToJSONKeyValue` keys HOT 5
- Add TypeScript instance for UTCTime HOT 3
- Haskell types with a `'` in the name result in broken code HOT 1
- Include Haddock documentation in generated types HOT 1
- Cut a new version to fix GHC 9.6 compilation errors HOT 2
- Prohibit `undefined` in TypeScript Index Signatures for `Data.Map` when key is `String` HOT 3
- Generate user-defined type guards HOT 6
- [Bug] `formatTSDeclarations'` does not honor `typeAlternativesFormat` if there is more than 1 `TSDeclaration` in the input list HOT 8
- `interfaceNameModifier` applied to tail of interface name not whole interface name, triggers name format error for valid interface names
- Writing custom TypeScript instances HOT 8
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