1  { self, ... }:
 2  {
 3    perSystem =
 4      {
 5        config,
 6        lib,
 7        system,
 8        ...
 9      }:
10      {
11        checks =
12          let
13            # System configuration checks (filter by current system)
14            nixosChecks =
15              lib.mapAttrs' (name: cfg: lib.nameValuePair "nixos-${name}" cfg.config.system.build.toplevel)
16                (
17                  lib.filterAttrs (_: cfg: cfg.pkgs.stdenv.hostPlatform.system == system) (
18                    self.nixosConfigurations or { }
19                  )
20                );
21  
22            darwinChecks = lib.mapAttrs' (name: cfg: lib.nameValuePair "darwin-${name}" cfg.system) (
23              lib.filterAttrs (_: cfg: cfg.pkgs.stdenv.hostPlatform.system == system) (
24                self.darwinConfigurations or { }
25              )
26            );
27  
28            # Home-manager configuration checks
29            homeChecks = lib.mapAttrs' (
30              name: cfg: lib.nameValuePair "home-manager-${name}" cfg.activationPackage
31            ) (config.legacyPackages.homeConfigurations or { });
32          in
33          nixosChecks // darwinChecks // homeChecks;
34      };
35  }