1{...}: {
 2  programs.helix.languages = {
 3    language = [
 4      {
 5        name = "latex";
 6        auto-format = true;
 7        indent = {
 8          tab-width = 2;
 9          unit = "  ";
10        };
11        formatter = {
12          command = "tex-fmt";
13          args = ["--stdin"];
14        };
15      }
16      {
17        name = "bibtex";
18        auto-format = true;
19        indent = {
20          tab-width = 2;
21          unit = "  ";
22        };
23        formatter = {
24          command = "tex-fmt";
25          args = ["--stdin"];
26        };
27      }
28    ];
29  };
30}