configurations/home-manager/eve/packages.nix

@@ -6,6 +6,7 @@
   ...
 }: let
   userConfig = osConfig.host.users.eve;
+  hardware = osConfig.host.hardware;
 in {
   config = {
     nixpkgs.config = {
@@ -17,6 +18,7 @@ in {
     home.packages = lib.lists.optionals userConfig.isDesktopUser (
       with pkgs; [
         ungoogled-chromium
+        (lib.mkIf hardware.piperMouse.enable piper)
       ]
     );
 

configurations/nixos/emergent/configuration.nix

@@ -49,6 +49,9 @@
         isPrincipleUser = true;
       };
     };
+    hardware = {
+      piperMouse.enable = true;
+    };
 
     storage = {
       enable = true;