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An easy to use, performant extensible effects library with seamless integration with the existing Haskell ecosystem.
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README.md

effective

Build Status

An effect system based on the ReaderT design pattern.

Main features:

  1. Very fast.

  2. Internals of the library are easy to reason about.

  3. Correct semantics in presence of runtime exceptions (no more lost or discarded state).

  4. Seamless integration with existing Haskell ecosystem (exceptions, monad-control, unliftio-core, resourcet).

  5. Effects can be defined for either static (as fast as it gets, single interpretation) or dynamic (slower, multiple interpretations) dispatch depending on your needs.

Example

A Filesystem effect with two handlers, one that runs in IO and another that uses an in-memory virtual file system can be found here.