1{...}: {
 2  programs.helix.languages = {
 3    language = [
 4      {
 5        name = "rust";
 6        auto-format = true;
 7        indent = {
 8          tab-width = 2;
 9          unit = "  ";
10        };
11      }
12    ];
13    language-server.rust-analyzer.config = {
14    };
15  };
16}