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flake/den/modules/aspects/provides/unfree.nix

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+{ lib, ... }:
+{
+  den.provides.unfree.description = ''
+    A class generic aspect that enables unfree packages by name.
+
+    Works for any class (nixos/darwin/homeManager,etc) on any host/user/home context.
+
+    ## Usage
+
+      den.aspects.my-laptop.includes = [ (den._.unfree [ "code" ]) ];
+
+    It will dynamically provide a module for each class when accessed.
+  '';
+
+  den.provides.unfree.__functor =
+    _self: allowed-names:
+    # deadnix: allow
+    { class, aspect-chain }:
+    {
+      ${class}.nixpkgs.config.allowUnfreePredicate = pkg: builtins.elem (lib.getName pkg) allowed-names;
+    };
+}