Update for letest wat

flake.nix

@@ -11,8 +11,12 @@
 
   };
 
-  outputs = flakes@{ self, wat, ... }: wat.lib.mkWatRepo ({ findMachines, ... }: {
-    nixosConfigurations = findMachines ./machines;
+  outputs = flakes: flakes.wat.lib.mkWatRepo flakes ({ findMachines, ... }: {
+    outputs = {
+
+      nixosConfigurations = findMachines ./machines;
+
+    };
   });
 
 }

machines/foobar/default.nix

-{ mkMachine, ... }:
+{ mkMachine, flakes, ... }:
 
-mkMachine "x86_64-linux" ({ ... }: {
+mkMachine flakes.nixpkgs "x86_64-linux" ({ ... }: {
 
   # your system here
+  fileSystems."/" = {
+    device = "/dev/TODO";
+  };
+  boot.loader.grub.device = "/dev/TODO";
 
 })