{
  description = "Your jupyenv project";

  nixConfig.extra-substituters = [
    "https://tweag-jupyter.cachix.org"
  ];
  nixConfig.extra-trusted-public-keys = [
    "tweag-jupyter.cachix.org-1:UtNH4Zs6hVUFpFBTLaA4ejYavPo5EFFqgd7G7FxGW9g="
  ];

  inputs = {
    #treefmt-nix.url = "github:Qubasa/treefmt-nix";
    treefmt-nix.url = "github:qubasa/treefmt-nix";
    flake-parts.url = "github:hercules-ci/flake-parts";
    flake-parts.inputs.nixpkgs-lib.follows = "nixpkgs";
    nixpkgs.url = "github:nixos/nixpkgs/nixos-unstable";
    jupyenv.url = "github:tweag/jupyenv";
  };

  outputs =
    inputs@{ flake-parts, ... }:
    flake-parts.lib.mkFlake { inherit inputs; } {
      imports = [ ./treefmt.nix ];
      systems = [
        "x86_64-linux"
        "aarch64-linux"
      ];
      perSystem =
        {
          lib,
          system,
          pkgs,
          ...
        }:
        let
          inherit (inputs.jupyenv.lib.${system}) mkJupyterlabNew;
          jupyterlab = mkJupyterlabNew (
            { ... }:
            {
              # nixpkgs = nixpkgs;
              imports = [ (import ./kernels.nix) ];
            }
          );
        in
        {
          devShells.default = pkgs.mkShell {
            buildInputs = with pkgs; [
              python3
            ];
          };
          packages = {
            inherit jupyterlab;
          };
          packages.default = jupyterlab;
          apps.default.program = "${jupyterlab}/bin/jupyter-lab";
          apps.default.type = "app";
        };
    };
}