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---
name: nix-justfile
description: Conventions for writing justfile recipes in Nix-based projects.
user-invocable: false
---
# Justfile in Nix projects
## Doc comments
Every recipe must have a doc comment (`#` line above the recipe name).
## Devshell detection
Use a `nix_shell` variable to auto-detect whether we're inside `nix develop`:
```just
nix_shell := if env('IN_NIX_SHELL', '') != '' { '' } else { 'nix develop -c' }
```
Prefix commands that need devshell tools (node, trunk, cargo-watch, etc.) with `{{nix_shell}}`. Recipes that invoke `nix` directly (build, run, flake commands) don't need it.
## Legibility
Long chained commands should use multiline `\` continuations.
