{
  description = "haskell-template's description";
  inputs = {
    nixpkgs.url = "github:nixos/nixpkgs/2df15ba83d0510a56f2583fd3481723835acb5a1";
    flake-utils.url = "github:numtide/flake-utils";
    flake-compat = {
      url = "github:edolstra/flake-compat";
      flake = false;
    };
  };
  outputs = inputs@{ self, nixpkgs, flake-utils, ... }:
    flake-utils.lib.eachSystem [ "x86_64-linux" "x86_64-darwin" "aarch64-darwin" ] (system:
      let
        overlays = [ ];
        pkgs =
          import nixpkgs { inherit system overlays; config.allowBroken = true; };
        project = returnShellEnv:
          pkgs.haskellPackages.developPackage {
            inherit returnShellEnv;
            name = "haskell-template";
            root = ./.;
            withHoogle = false;
            overrides = self: super: with pkgs.haskell.lib; {
              # Use callCabal2nix to override Haskell dependencies here
              # cf. https://tek.brick.do/K3VXJd8mEKO7
            };
            modifier = drv:
              pkgs.haskell.lib.addBuildTools drv (with pkgs.haskellPackages;
              [
                # Specify your build/dev dependencies here. 
                cabal-fmt
                cabal-install
                ghcid
                haskell-language-server
                ormolu
                pkgs.nixpkgs-fmt
              ]);
          };
      in
      {
        # Used by `nix build` & `nix run` (prod exe)
        defaultPackage = project false;

        # Used by `nix develop` (dev shell)
        devShell = project true;
      });
}