Pure logger typeclass and monad transformer.

This package provides a typeclass for logging in pure code, or more generally, in any kind of context. You can do whatever you want with logs, especially get them, clear them or even sink them through IO if you're logging in (MonadIO m) => m.

monad-journal

Pure logger typeclass and monad transformer

What is monad-journal?

monad-journal is a simple but powerful answer to the logging problem. A lot of people think that “logging” is IO-related, while it’s not. Everyone must know MonadWriter , which is perfect to log things in pure computations. The issue is that you can’t access those “things” inside the computation itself. monad-journal exposes a cool typeclass called MonadJournal that enables you to do so.