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-## Discover Nix files
-
-### Rule
-
-Use `util.collectNixFiles` to discover Nix files.
-Do not use `builtins.readDir` with a `.nix` suffix filter for this purpose.
-Pass `util` to Nix functions that need the helper.
-
-### Rationale
-
-`util.collectNixFiles` centralizes recursive discovery of Nix files.
-Repository Nix code uses one implementation.