default.nix

with (import <nixpkgs> {});
with (import (builtins.fetchTarball https://github.com/moretea/yarn2nix/archive/8df1cee02f53bbb58ec0479fad5cca6ee3def170.tar.gz) { inherit pkgs; });
rec {
  haas-form-submit = mkYarnPackage {
    name = "haas-form-submit";
    src = ./.;
    packageJson = ./package.json;
    yarnLock = ./yarn.lock;
    yarnNix = ./yarn.nix;
  };
}

overlay.nix

self: super:
{
  haas-form-submit = import (builtins.fetchGit {
    url = "git@gitlab.com:hilfeleistung-aas/form-submit.git";
    rev = "f7686ec1b0ad90b60e1d85349e2508516a8540d0";
  });
}

packages.nix

{ config, pkgs, ... }:
{
  nixpkgs.overlays = [
    (import ./overlay.nix)
  ];

  environment.systemPackages = with pkgs; [
    git
    haas-form-submit
  ];
}