{
  description = "read if cute";

  inputs = {
    nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable"; # needed for easy overriding... and tests
    tangledCore = {
      url = "git+https://tangled.org/tangled.org/core";

      inputs = {
        # upstream pinned stuff like git repos not included because lockfile already stores rev
        nixpkgs.follows = "nixpkgs";
      };
    };
  };

  outputs = { self, tangledCore, nixpkgs }: let
    lib = nixpkgs.lib;
    testedSystems = ["x86_64-linux" "aarch64-linux"];
    forAllSystems = fn: lib.genAttrs testedSystems (system: fn nixpkgs.legacyPackages.${system});
  in {
    nixosModules.default = import ./module.nix tangledCore;

    checks = forAllSystems (pkgs: {
      default = pkgs.callPackage ./test.nix { module = self.nixosModules.default; };
    });
  };
}