devos/doc/concepts/extern.md

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External Art

When you need to use a module, overlay, or pass a value from one of your inputs to the rest of your NixOS configuration, you can make use of a couple arguments. It is encouraged to add external art directly in your flake.nix so the file represents a complete dependency overview of your flake.

Overlays

External overlays can directly be added to a channel's overlays list.

flake.nix:

{
  channels.nixos.overlays = [ inputs.agenix.overlay ];
}

These overlays will be automatically filtered by inspecting the inputs argument.

Modules

There is a dedicated nixos.hostDefaults.externalModules argument for external modules.

flake.nix:

{
  nixos.hostDefaults.externalModules = [ inputs.agenix.nixosModules.age ];
}

Home Manager

Since there isn't a hosts concept for home-manager, externalModules is just a top-level argument in the home namespace.

flake.nix:

{
  home.externalModules = [ doom-emacs = doom-emacs.hmModule ];
}
Note:

The optimal solution would be to automatically export modules that were created in your flake. But this is not possible due to NixOS/nix#4740.