Move lib into its own file.

flake.nix

@@ -11,25 +11,6 @@
       module = { imports = [ ./modules ]; };
     };
 
-    lib = {
+    lib = import ./lib.nix { inherit nixpkgs; };
-      makeServiceConfig = { system, module }:
-        let
-          lib = nixpkgs.lib;
-          nixosConfig = nixpkgs.lib.nixosSystem {
-            inherit system;
-            specialArgs = { };
-            modules = [ module ];
-          };
-          services = lib.flip lib.genAttrs
-            (serviceName:
-              nixosConfig.config.systemd.units."${serviceName}.service".unit)
-            nixosConfig.config.service-manager.services;
-        in
-        nixpkgs.legacyPackages.${system}.writeTextFile {
-          name = "services";
-          destination = "/services.json";
-          text = lib.generators.toJSON { } services;
-        };
-    };
   };
 }

lib.nix

@@ -0,0 +1,23 @@
+{ nixpkgs }:
+let
+  inherit (nixpkgs) lib;
+in
+{
+  makeServiceConfig = { system, module }:
+    let
+      nixosConfig = lib.nixosSystem {
+        inherit system;
+        specialArgs = { };
+        modules = [ module ];
+      };
+      services = lib.flip lib.genAttrs
+        (serviceName:
+          nixosConfig.config.systemd.units."${serviceName}.service".unit)
+        nixosConfig.config.service-manager.services;
+    in
+    nixpkgs.legacyPackages.${system}.writeTextFile {
+      name = "services";
+      destination = "/services.json";
+      text = lib.generators.toJSON { } services;
+    };
+}