os/lib/default.nix

{lib}:
lib.makeExtensible (self: let
  callLibs = file: import file {lib = self;};
in rec {
  ## Define your own library functions here!
  #id = x: x;
  ## Or in files, containing functions that take {lib}
  #foo = callLibs ./foo.nix;
  ## In configs, they can be used under "lib.our"
})