fix: added missing imports

modules/base.nix

@@ -105,6 +105,9 @@ in {
       };
     };
   };
+
+  imports = [ ./nixpkgs.nix ];
+
   config = {
     # By default, we enable cross-compilation support.
     nixpkgs.buildPlatform = lib.mkDefault builtins.currentSystem;

modules/nixpkgs.nix

@@ -330,6 +330,8 @@ in
       '';
     };
   };
+  
+  imports = [ ./misc/assertions.nix ];
 
   config = {
     _module.args = {

modules/outputs/initramfs.nix

@@ -13,6 +13,14 @@ in
     boot.initramfs = {
       enable = mkEnableOption "initramfs";
     };
+    system.build.toplevel = mkOption {
+        type = types.package;
+        description = ''
+          pkgs.systemconfig for the configured filesystem,
+          contains 'activate' and 'init' commands
+        '';
+        internal = true;
+    };
     system.outputs = {
       initramfs = mkOption {
         type = types.package;
@@ -39,6 +47,8 @@ in
       INITRAMFS_COMPRESSION_ZSTD = "y";
     };
 
+    system.build.toplevel = config.system.outputs.systemConfiguration;
+
     system.outputs = {
       initramfs =
         let