nixos/flake/overlays.nix

{
  self,
  inputs,
  lib,
  rootPath,
  ...
}:
let
  inherit (self) outputs;
  importWithArgs = lib.flip import { inherit inputs outputs; };
in
{
  flake.overlays =
    [
      "modifications"
      "additions"
    ]
    |> (with lib; flip genAttrs (name: importWithArgs (rootPath + "/overlays/${name}")));
}