I created a common packages nix file as

{ pkgs }:
with pkgs: [ exa bat ...]

and two other separate files for mac and linux packages that looked similar

and then imported these into home.nix

let
  combinedPackages = lib.lists.concatLists [  import ./common.pkgs.nix { inherit lib; inherit pkgs; } import ./mac.pkgs.nix { inherit lib; inherit pkgs; } ]
...

anyone does this in a better way?