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flake/den/templates/default/modules/aspects/defaults.nix

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+{
+  config,
+  # deadnix: skip # enable <den/brackets> syntax for demo.
+  __findFile ? __findFile,
+  den,
+  ...
+}:
+{
+  # Lets also configure some defaults using aspects.
+  # These are global static settings.
+  den.default = {
+    darwin.system.stateVersion = 6;
+    nixos.system.stateVersion = "25.05";
+    homeManager.home.stateVersion = "25.05";
+  };
+
+  # These are functions that produce configs
+  den.default.includes = [
+    # ${user}.provides.${host} and ${host}.provides.${user}
+    <eg/routes>
+
+    # Enable home-manager on all hosts.
+    <den/home-manager>
+
+    # Automatically create the user on host.
+    <den/define-user>
+
+    # Disable booting when running on CI on all NixOS hosts.
+    (if config ? _module.args.CI then <eg/ci-no-boot> else { })
+
+    # NOTE: be cautious when adding fully parametric functions to defaults.
+    # defaults are included on EVERY host/user/home, and IF you are not careful
+    # you could be duplicating config values. For example:
+    #
+    #  # This will append 42 into foo option for the {host} and for EVERY {host,user}
+    #  ({ host, ... }: { nixos.foo = [ 42 ]; }) # DO-NOT-DO-THIS.
+    #
+    #  # Instead try to be explicit if a function is intended for ONLY { host }.
+    (den.lib.take.exactly (
+      # deadnix: skip
+      { OS, host }:
+      {
+        nixos.networking.hostName = host.hostName;
+      }
+    ))
+
+  ];
+}