add darwinModules

all-modules.nix

@@ -2,6 +2,7 @@
   imports = [
     ./modules/apps.nix
     ./modules/checks.nix
+    ./modules/darwinModules.nix
     ./modules/debug.nix
     ./modules/devShells.nix
     ./modules/flake.nix

modules/darwinModules.nix

@@ -0,0 +1,27 @@
+{self, lib, flake-parts-lib, moduleLocation, ...}:
+
+let
+  inherit (lib)
+    mapAttrs
+    mkOption
+    types
+    ;
+  inherit (flake-parts-lib)
+    mkSubmoduleOptions
+    ;
+in
+
+{
+  options.flake = mkSubmoduleOptions {
+    darwinModules = mkOption {
+      type = types.lazyAttrsOf types.unspecified;
+      default = {};
+      apply = mapAttrs (k: v: { _file = "${toString moduleLocation}#darwinModules.${k}"; imports = [ v ]; });
+        description = ''
+          Darwin modules.
+
+          You may use this for reusable pieces of configuration, service modules, etc for [nix-darwin](https://github.com/LnL7/nix-darwin).
+        '';
+    };
+  };
+}