mirror of
https://github.com/NixOS/nixpkgs.git
synced 2025-11-10 09:43:30 +01:00
6 lines
602 B
Markdown
6 lines
602 B
Markdown
# Debugging Nix Expressions {#sec-debug}
|
|
|
|
Nix is a unityped, dynamic language, this means any value can potentially appear anywhere. Since it is also non-strict, evaluation order and what is ultimately evaluated might surprise you. Therefore, it is important to be able to debug Nix expressions.
|
|
|
|
In the `lib/debug.nix` file you will find a number of functions that help (pretty-)printing values while evaluation is running. You can even specify how deep these values should be printed recursively, and transform them on the fly. Please consult the docstrings in `lib/debug.nix` for usage information.
|