If you are using both NixOS and Home Manager, is it supported to use the homeConfigurations like this in a nixosModule?

home-manager.users.${username} = inputs.self.homeConfigurations.${username}

I get the following error, when I try it:

 Module `:anon-5:anon-1' has an unsupported attribute `activation-script'. This is caused by introducing a top-level `config' or `options' attribute. Add configuration attributes immediately on the top level instead, or move all of them (namely: activation-script activationPackage extendModules newsDisplay newsEntries pkgs) into the explicit `config' attribute.

interestingly, something like the following in nix/withOverlays/default.nix works:

final: prev: (prev.lib.composeManyExtensions [
  prev.inputs.nixgl.overlays.default
  prev.inputs.emacs-overlay.overlays.package
  prev.inputs.self.overlays.overrides
  prev.inputs.self.overlays.lix
]) final prev

So computing the module arguments is triggering evaluation of withOverlays... hmm

Does it make sense that this is supported?: (How does Flakelight know whether it is an overlay or a function to setup multiple overlays, like in my example ?)

withOverlays = overlay; 

Shouldn't it only support?:

withOverlays = [overlay, ...];