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Add Codensity instance for MonadJSM #161

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Add Codensity instance for MonadJSM #161

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1 change: 1 addition & 0 deletions jsaddle/jsaddle.cabal
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Original file line number Diff line number Diff line change
Expand Up @@ -117,6 +117,7 @@ library
base64-bytestring >=1.0.0.1 && <1.3,
bytestring >=0.10.6.0 && <0.13,
exceptions >=0.8 && <0.11,
kan-extensions >= 5 && < 6,
lens >=3.8.5 && <5.4,
primitive >=0.6.1.0 && <0.10,
text >=1.2.1.3 && <1.3 || >= 2.0 && < 2.2,
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6 changes: 6 additions & 0 deletions jsaddle/src/Language/Javascript/JSaddle/Types.hs
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Expand Up @@ -97,6 +97,7 @@ import GHCJS.Prim.Internal (JSVal(..), JSValueRef)
import Data.JSString.Internal.Type (JSString(..))
import Control.DeepSeq (NFData(..))
import Control.Monad.Catch (MonadThrow, MonadCatch(..), MonadMask(..))
import Control.Monad.Codensity (Codensity(..))
import Control.Monad.Trans.Cont (ContT(..))
import Control.Monad.Trans.Except (ExceptT(..))
import Control.Monad.Trans.Identity (IdentityT(..))
Expand All @@ -117,10 +118,12 @@ import Data.Int (Int64)
import Data.Set (Set)
import Data.Text (Text)
import Data.Time.Clock (UTCTime(..))
import Data.Type.Equality (type (~~))
import Data.Typeable (Typeable)
import Data.Coerce (coerce, Coercible)
import Data.Aeson
(defaultOptions, genericToEncoding, ToJSON(..), FromJSON(..), Value)
import GHC.Exts (TYPE)
import GHC.Generics (Generic)
import Control.Monad.IO.Unlift (MonadUnliftIO)
import qualified Control.Monad.Fail as Fail
Expand Down Expand Up @@ -316,6 +319,9 @@ instance (Monoid w, MonadJSM m) => MonadJSM (Strict.WriterT w m) where
liftJSM' = lift . liftJSM'
{-# INLINE liftJSM' #-}

instance (m ~~ m', MonadJSM m') => MonadJSM (Codensity (m :: k -> TYPE rep)) where
liftJSM' = lift . liftJSM'

instance MonadRef JSM where
type Ref JSM = Ref IO
newRef = liftIO . newRef
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