Set up typescript language server and add meld to git.

nix/configuration/roles/emacs/default.nix

@@ -131,8 +131,9 @@ in
                     final.cmake-language-server
                     final.cmake # Used by cmake-language-server
                     final.rust-analyzer
-                    final.nodePackages_latest.prettier # Format yaml, json, and JS
+                    final.prettier # Format yaml, json, and JS
                     final.terraform-ls
+                    final.typescript-language-server
                   ]
                 }
               '';

nix/configuration/roles/emacs/files/emacs/elisp/lang-javascript.el

@@ -1,6 +1,12 @@
 (require 'common-lsp)
 (require 'util-tree-sitter)
 
+(defun js-format-buffer ()
+  "Run prettier."
+  (interactive)
+  (run-command-on-buffer "prettier" "--stdin-filepath" buffer-file-name)
+  )
+
 (use-package json-ts-mode
   :ensure nil
   :pin manual
@@ -113,10 +119,14 @@
          ("\\.js\\'" . js-ts-mode)
          )
   :commands (js-ts-mode)
+  :custom (
+           (js-indent-level 2)
+           )
   :hook (
          (js-ts-mode . (lambda ()
                                  (when-linux
                                    (eglot-ensure)
+                                   (add-hook 'before-save-hook 'js-format-buffer nil 'local)
                                    )
                                  ))
          )