{
  description = "Flutter package for rendering kanji stroke animations";

  inputs = {
    nixpkgs.url = "nixpkgs/nixos-unstable";

    kanjivg = {
      url = "github:KanjiVG/kanjivg";
      flake = false;
    };
  };

  outputs = {
    self,
    nixpkgs,
    kanjivg
  }: let
    inherit (nixpkgs) lib;
    systems = [
      "x86_64-linux"
      "aarch64-linux"
      "x86_64-darwin"
      "aarch64-darwin"
    ];

    forAllSystems = f: lib.genAttrs systems (system: f system nixpkgs.legacyPackages.${system});
  in {
    devShells = forAllSystems (system: pkgs: {
      default = pkgs.mkShell {
        nativeBuildInputs = with pkgs; [
          flutter
          dart
        ];

        env.KANJIVG_PATH = "${kanjivg}/kanji";
      };
    });

    packages = let
      src = builtins.filterSource (path: type: let
        baseName = baseNameOf (toString path);
      in !(lib.any (b: b) [
          (!(lib.cleanSourceFilter path type))
          (baseName == "nix" && type == "directory")
          (baseName == ".envrc" && type == "regular")
          (baseName == "flake.lock" && type == "regular")
          (baseName == "flake.nix" && type == "regular")
        ])) ./.;
    in forAllSystems (system: pkgs: {
      # default = self.packages.${system}.kanjimaji;

      filteredSource = pkgs.runCommandLocal "filtered-source" { } ''
        ln -s ${src} $out
      '';
    });
  };
}