{ self, ... }:
{
  perSystem =
    {
      self',
      lib,
      system,
      ...
    }:
    {
      checks =
        let
          nixosMachines = lib.mapAttrs' (
            name: config: lib.nameValuePair "nixos-${name}" config.config.system.build.toplevel
          ) ((lib.filterAttrs (_: config: config.pkgs.system == system)) self.nixosConfigurations);

          packages = lib.mapAttrs' (n: lib.nameValuePair "package-${n}") self'.packages;
          devShells = lib.mapAttrs' (n: lib.nameValuePair "devShell-${n}") self'.devShells;
        in
        nixosMachines // packages // devShells;
    };
}