{
  description = "Taiga a frontend tester";

  inputs = {
    nixpkgs.url = "github:nixos/nixpkgs?ref=nixos-unstable";
    treefmt-nix.url = "github:numtide/treefmt-nix";
  };

  outputs =
    { nixpkgs, ... }@inputs:
    let
      supportedSystems = [ "x86_64-linux" ];
      pkgsFor =
        system:
        nixpkgs.legacyPackages.${system}.extend (
          nixpkgs.lib.composeManyExtensions [ ]
          # nixpkgs.lib.composeManyExtensions ([ ] ++ builtins.attrValues self.overlays)
        );
      eachSystem = f: nixpkgs.lib.genAttrs supportedSystems (system: f (pkgsFor system));

      treefmtEval = eachSystem (pkgs: inputs.treefmt-nix.lib.evalModule pkgs ./treefmt.nix);

      packageSetFor =
        pkgs:
        let
          npmDeps = pkgs.importNpmLock.buildNodeModules {
            npmRoot = ./.;
            nodejs = pkgs.nodejs;
          };
          npmPackage = pkgs.buildNpmPackage {
            pname = "taiga";
            version = "0.1.0";
            src = ./.;
            inherit npmDeps;
            npmConfigHook = pkgs.importNpmLock.npmConfigHook;
          };
        in
        {
          inherit npmDeps;
          inherit npmPackage;
        };
    in
    {
      # nix fmt formatter
      formatter = eachSystem (pkgs: treefmtEval.${pkgs.system}.config.build.wrapper);

      packages = eachSystem (pkgs: packageSetFor pkgs);

      # default devshell
      devShells = eachSystem (pkgs: {
        default = pkgs.mkShell {
          packages = with pkgs; [
            importNpmLock.hooks.linkNodeModulesHook
            nodejs
            just
            svelte-language-server
          ];

          npmDeps = pkgs.importNpmLock.buildNodeModules {
            npmRoot = ./.;
            nodejs = pkgs.nodejs;
          };

          # Will be executed before entering the shell
          # or running a command
          shellHook = ''
            linkNodeModulesHook
            echo "Dev env ready"
          '';
        };
      });
    };
}