trying again

flake.nix

@@ -12,6 +12,13 @@
     in
     flake-utils.lib.eachDefaultSystem (system:
       with nixpkgs.legacyPackages.${system}; {
+
+        nixosModules = {
+          # add moduleA from flakeA as an output
+          # moduleA = flakeA.nixosModules.moduleA;
+          default = import ./module.nix { inherit nixpkgs };
+        };
+
         packages.${productName} = rustPlatform.buildRustPackage {
           name = "${productName}";
           version = "${productVersion}";