almost there

flake.nix

@@ -20,6 +20,10 @@
       in {
         _module.args.pkgs = import inputs.nixpkgs {inherit system;};
 
+        devShells.default = pkgs.mkShell {
+          buildInputs = with pkgs; [nodejs];
+        };
+
         packages.default = pkgs.buildNpmPackage (finalAttrs: {
           pname = name;
           version = "1.0.0";
@@ -46,7 +50,7 @@
           };
         });
 
-        apps.install = {
+        apps.default = {
           type = "app";
           program = let
             file = "/tmp/${uuid}.zip";
@@ -54,6 +58,7 @@
             pkgs.writeShellScriptBin "build" ''
               env -C ${self'.packages.default}/${extDir} ${lib.getExe pkgs.zip} ${file} -FS9r .
               gnome-extensions install --force ${file}
+              dbus-run-session -- gnome-shell --nested --wayland
             '';
         };
       };