Editing GHC/QualifiedModuleExport (section)

== Motivation ==

There are a number of libraries in the Haskell ecosystem which encourage qualified imports to avoid name clashes with other modules. For example:

<haskell>
   -- Import the ByteString and Text types un-qualified.
  import Data.ByteString (ByteString)
  import Data.Map.Strict (Map)
  import Data.Text (Text)

  -- Import ByteString and Text modules qualified to avoid name collisions.
  import qualified Data.ByteString.Char8 as BS
  import qualified Data.Map.Strict as Map
  import qualified Data.Text as T

</haskell>

In larger projects the above lines will need to be added to every file that uses <hask>ByteString</hask>, <hask>Map</hask> and <hask>Text</hask>.

The problem for the types can easily be fixed by creating a Prelude module which does the following:

<haskell>
  module MyPrelude
      ( Text
      , Map
      , ByteString
      ) where
  import Data.ByteString (ByteString)
  import Data.Map.Strict (Map)
  import Data.Text (Text)

</haskell>

and then importing MyPrelude to access the types. Unfortunately there is currently no way to add qualified module exports to <hask>MyPrelude</hask> and have those qualified names available to modules that import <hask>MyPrelude</hask>.