deadnix

Scan .nix files for dead code (unused variable bindings).

Usage with Nix Flakes

$ nix run github:astro/deadnix test.nix

test.nix:1:
> unusedArgs@{ unusedArg, usedArg, ... }:
> ^^^^^^^^^^   ^^^^^^^^^
> |            |
> |            unused lambda pattern: unusedArg
> unused lambda @-binding: unusedArgs
test.nix:5:
>   unused = "fnord";
>   ^^^^^^
>   |
>   unused let in binding: unused
test.nix:3:
>   inherit (builtins) unused_inherit;
>                      ^^^^^^^^^^^^^^
>                      |
>                      unused let in inherit binding: unused_inherit
test.nix:12:
>   x = { unusedArg2, x ? args.y, ... }@args: used1 + x;
>         ^^^^^^^^^^
>         |
>         unused lambda pattern: unusedArg2

What if the produced reports are wrong?

Please open an issue. Do not forget to include the .nix code that produces incorrect results.

Commercial Support

The author can be hired to implement the features that you wish, or to integrate this tool into your toolchain.