Weeder
A Haskell tool for whole-program dead-code analysis using GHC's HIE files to detect unused code across module boundaries.
What is Weeder?
Weeder is a Haskell tool that performs whole-program dead-code analysis to identify code that is written but never reachable from other parts of a project. It solves the problem of leftover code accumulating over a project's lifetime by analyzing dependencies across module boundaries using GHC's HIE files. Unlike GHC's single-module warnings, Weeder provides a comprehensive view of unused code throughout the entire codebase.
Haskell developers and teams maintaining medium to large Haskell projects who want to keep their codebases clean and free of unused code. It's particularly useful for projects with many modules where cross-module dead code is hard to detect manually.
Developers choose Weeder because it fills a critical gap in Haskell's tooling by providing cross-module dead-code detection, which GHC doesn't offer. Its integration with existing build systems (Cabal, Stack, Nix) and configurable root detection make it practical for real-world projects with complex dependency structures.
Overview
A re-implementation of weeder using HIE files
Use Cases
Best For
- Identifying unused functions and definitions in multi-module Haskell projects
Related Projects
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