{ pkgs, treefmt }:
{
  helix = {
    language = {
      name = "nix";
      language-servers = [
        "nil"
        "harper-ls"
      ];
      formatter = {
        command = "${treefmt}/bin/treefmt";
        args = [
          "--stdin"
          ".nix"
          "--quiet"
        ];
      };
      auto-format = true;
    };
    language-server.nil.command = "${pkgs.nil}/bin/nil";
  };
  treefmt.programs.nixfmt = {
    enable = true;
    strict = true;
  };
}