Polysemy

Polysemy is a high-performance, zero-boilerplate effect system for Haskell, designed to simplify the handling of side effects in functional programs. Unlike traditional monad transformer stacks, Polysemy uses a modern approach based on freer monads and interpreters, allowing developers to define, compose, and interpret effects in a more modular and testable way. It aims to offer both flexibility and performance without sacrificing type safety or expressiveness.

Features

Defines effects as pure Haskell data types
Enables modular, composable effect handlers
Avoids monad transformer boilerplate
Supports runtime and compile-time interpreters
Promotes testability by mocking effects
Designed for high performance and clarity

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License

BSD License

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Programming Language

Haskell

Related Categories

Haskell Libraries

Registered

2025-07-17

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Polysemy

Higher-order, no-boilerplate monads

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