{
  description = "kotsukotsu typing app";

  inputs = {
    nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
    bun2nix.url = "github:nix-community/bun2nix";
    bun2nix.inputs.nixpkgs.follows = "nixpkgs";
  };

  outputs = {
    self,
    nixpkgs,
    bun2nix,
  }: let
    systems = ["x86_64-linux" "aarch64-linux"];
    forAllSystems = nixpkgs.lib.genAttrs systems;
  in {
    packages = forAllSystems (system: let
      pkgs = import nixpkgs {
        inherit system;
        overlays = [bun2nix.overlays.default];
      };
    in rec {
      kotsukotsu = pkgs.callPackage ./nix/package.nix {};
      default = kotsukotsu;
    });

    devShells = forAllSystems (system: let
      pkgs = import nixpkgs {
        inherit system;
        overlays = [bun2nix.overlays.default];
      };
    in {
      default = pkgs.mkShell {
        packages = with pkgs; [
          bun
          bun2nix
          nodejs
        ];
      };
    });

    nixosModules.default = import ./nix/module.nix;
  };
}