system.extraDependencies

A list of paths that should be included in the system closure but generally not visible to users.

This option has also been used for build-time checks, but the system.checks option is more appropriate for that purpose as checks should not leave a trace in the built system configuration.

Type
list of path in the Nix store
Default
[ ]
Declared
<nixpkgs/nixos/modules/system/activation/top-level.nix>