typeable-th

There is no need to manually write TypeableN instances anymore, even for complex data types! This package derives typeable instances automatically. To use it, you just have to enable a few extensions and import the package:

{-# LANGUAGE EmptyDataDecls       #-}
{-# LANGUAGE FlexibleContexts     #-}
{-# LANGUAGE KindSignatures       #-}
{-# LANGUAGE ScopedTypeVariables  #-}
{-# LANGUAGE TemplateHaskell      #-}
{-# LANGUAGE UndecidableInstances #-}

import Data.Typeable.TH

And then define your data type and call makeTypeable ''YourDataTypeName:

data Weird a (b :: * -> *) c d = Weird

makeTypeable ''Weird

And that's it!

Contributions

Contributions and bug reports are welcome! Just fork and then sumbit a pull request if you want to implement some feature, or open a bug report to discuss the feature or bug.