add json support for helix

home/modules/helix/default.nix

@@ -23,6 +23,7 @@
           nixd
           deno
           nixfmt-rfc-style
+          nodePackages_latest.vscode-json-languageserver
         ];
         example = (
           with pkgs;
@@ -50,6 +51,48 @@
             config = builtins.fromTOML config-file;
           in
           config;
+        languages = {
+          language-server = {
+            vscode-json-languageserver = {
+              command = "vscode-json-languageserver";
+              args = [ "--stdio" ];
+              config = {
+                provideFormatter = true;
+                json = {
+                  validate = {
+                    enable = true;
+                  };
+                };
+              };
+            };
+          };
+          language = [
+            {
+              name = "markdown";
+              formatter = {
+                command = "deno";
+                args = [
+                  "fmt"
+                  "-"
+                  "--ext"
+                  "md"
+                ];
+              };
+            }
+            {
+              name = "json";
+              language-servers = [
+                "vscode-json-languageserver"
+              ];
+            }
+            {
+              name = "jsonc";
+              language-servers = [
+                "vscode-json-languageserver"
+              ];
+            }
+          ];
+        };
       };
       home.packages = cfg.extraPackages;
     };