What am I doing wrong?

[kjurl]

I am trying to import all modules into one file (also using the self attribute to define config and options in the modules) - running the following, results in the error below:

inputs.haumea.lib.load {
  src = ./modules/nixos;
  loader = inputs.haumea.lib.loaders.scoped;
  transformer = [ (inputs.haumea.lib.transformers.hoistAttrs "options" "options") ];
}

error:
       … while calling the 'foldl'' builtin

         at /nix/store/60sn02zhawl3kwn0r515zff3h6hg6ydz-source/lib/trivial.nix:317:19:

          316|   */
          317|   flip = f: a: b: f b a;
             |                   ^
          318|

       … while calling the 'foldl'' builtin

         at /nix/store/60sn02zhawl3kwn0r515zff3h6hg6ydz-source/lib/trivial.nix:317:19:

          316|   */
          317|   flip = f: a: b: f b a;
             |                   ^
          318|

       (stack trace truncated; use '--show-trace' to show the full trace)

       error: attribute 'lib' missing

       at /nix/store/ih873qmabdsdgk1naaiv6v7jy1mxq241-source/src/loaders/__defaultWith.nix:24:23:

           23|   functionArgs
           24|   (mapAttrs (name: _: inputs.${name}))
             |                       ^
           25|   f