freer-converse

Handle effects conversely using monadic conversation.

One can think of an effectful program and its effect handler as two communicating processes. This package provides the missing pieces that let you write your programs in such a style in Control.Monad.Freer.Converse.

One useful area of application is unit testing. The Control.Monad.Freer.TestControl intends to provide what you need to write ad-hoc test fixtures.