update

flake/formatter.nix

@@ -4,32 +4,45 @@
     inputs.treefmt-nix.flakeModule
   ];
 
-  perSystem = _: {
-    treefmt = {
-      projectRootFile = "flake.nix";
-
-      programs = {
-        nixfmt.enable = true;
-        deadnix.enable = true;
-        statix.enable = true;
-
-        shfmt.enable = true;
-        shellcheck.enable = true;
-
-        prettier.enable = true;
-        yamlfmt.enable = true;
-        taplo.enable = true;
-        oxfmt.enable = true;
+  perSystem =
+    { system, ... }:
+    let
+      unstable = import inputs.nixpkgs-unstable {
+        inherit system;
+        config = {
+          allowUnfree = true;
+        };
       };
+    in
+    {
+      treefmt = {
+        projectRootFile = "flake.nix";
 
-      settings = {
-        excludes = [
-          ".git/**"
-          "*.lock"
-          ".direnv/**"
-          "*.age"
-        ];
+        programs = {
+          nixfmt.enable = true;
+          deadnix.enable = true;
+          statix.enable = true;
+
+          shfmt.enable = true;
+          shellcheck.enable = true;
+
+          prettier = {
+            enable = true;
+            package = unstable.prettier;
+          };
+          yamlfmt.enable = true;
+          taplo.enable = true;
+          oxfmt.enable = true;
+        };
+
+        settings = {
+          excludes = [
+            ".git/**"
+            "*.lock"
+            ".direnv/**"
+            "*.age"
+          ];
+        };
       };
     };
-  };
 }