monad-logger

A class of monads which can log messages.

https://github.com/kazu-yamamoto/logger

Version on this page:0.3.13.2
LTS Haskell 23.24:0.3.42
Stackage Nightly 2025-05-28:0.3.42
Latest on Hackage:0.3.42

See all snapshots monad-logger appears in

MIT licensed by Michael Snoyman
Maintained by [email protected]
This version can be pinned in stack with:monad-logger-0.3.13.2@sha256:f88167a3b96abf4ff82e0315155e34d991f7df4d73e7c01367aac514a5cc2a87,1839

Module documentation for 0.3.13.2

monad-logger

A monad transformer approach for logging.

This package provides Template Haskell functions for determining source code locations of messages.

Changes

0.3.13.1

  • Allow fast-logger 2.3

0.3.13

  • Re-export LogStr from fast-logger #56
  • Added filterLogger

0.3.12

  • Use transformers-compat to provide universal ExceptT support #53

0.3.11.1

Add support for monad-control 1.0 #52

0.3.11

Add missing MonadState and MonadWriter instances for NoLoggingT #51

0.3.10.1

Remove unnecessary extra newline in log messages.

0.3.10

Introduce the MonadLoggerIO typeclass.

0.3.9

Add missing MonadError NoLoggingT instance #49

0.3.8

Simplify constraint on MonadLogger (NoLoggingT m) from MonadIO m to Monad m Github issue #48.