diff --git a/docs.nix b/docs.nix
index 7baa81e..1f8bb75 100644
--- a/docs.nix
+++ b/docs.nix
@@ -67,7 +67,7 @@ pkgs.mkShellNoCC {
 
       facterMarkdown = mkMarkdown "facter" eval.options.facter.detected;
       otherMarkdown = lib.mapAttrsToList mkMarkdown (
-        lib.filterAttrs (n: v: n != "detected") eval.options.facter
+        lib.filterAttrs (n: _v: n != "detected") eval.options.facter
       );
 
       optionsMarkdown = pkgs.symlinkJoin {
diff --git a/flake.nix b/flake.nix
index c3de0aa..aa0d826 100644
--- a/flake.nix
+++ b/flake.nix
@@ -56,12 +56,16 @@
           }
         );
         formatter = eachSystem (
-          { pkgs, ... }: pkgs.callPackage ./formatter.nix { inputs = publicInputs // privateInputs; }
+          { pkgs, ... }:
+          (pkgs.callPackage ./formatter.nix { inputs = publicInputs // privateInputs; }).config.build.wrapper
         );
 
         checks = eachSystem (
           { pkgs, ... }:
           {
+            formatting =
+              (pkgs.callPackage ./formatter.nix { inputs = publicInputs // privateInputs; }).config.build.check
+                publicInputs.self;
             minimal-machine =
               (pkgs.nixos [
                 publicInputs.self.nixosModules.facter
diff --git a/formatter.nix b/formatter.nix
index 1b6b9d2..c067958 100644
--- a/formatter.nix
+++ b/formatter.nix
@@ -2,7 +2,7 @@
 let
   hasNixFmt = pkgs.lib.meta.availableOn pkgs.stdenv.buildPlatform pkgs.nixfmt-rfc-style.compiler;
 in
-inputs.treefmt-nix.lib.mkWrapper pkgs {
+inputs.treefmt-nix.lib.evalModule pkgs {
   projectRootFile = ".git/config";
 
   programs = {
diff --git a/modules/nixos/bluetooth.nix b/modules/nixos/bluetooth.nix
index f8fabb8..5195311 100644
--- a/modules/nixos/bluetooth.nix
+++ b/modules/nixos/bluetooth.nix
@@ -1,8 +1,12 @@
 { lib, config, ... }:
 {
-  options.facter.detected.bluetooth.enable = lib.mkEnableOption "Enable the Facter bluetooth module" // {
-    default = builtins.length (config.facter.report.hardware.bluetooth or []) > 0;
-  };
+  options.facter.detected.bluetooth.enable =
+    lib.mkEnableOption "Enable the Facter bluetooth module"
+    // {
+      default = builtins.length (config.facter.report.hardware.bluetooth or [ ]) > 0;
+    };
 
-  config.hardware.bluetooth.enable = lib.mkIf config.facter.detected.bluetooth.enable (lib.mkDefault true);
+  config.hardware.bluetooth.enable = lib.mkIf config.facter.detected.bluetooth.enable (
+    lib.mkDefault true
+  );
 }
diff --git a/modules/nixos/disk.nix b/modules/nixos/disk.nix
index dcd14ba..ab5648c 100644
--- a/modules/nixos/disk.nix
+++ b/modules/nixos/disk.nix
@@ -8,14 +8,14 @@ in
   options.facter.detected.boot.disk.kernelModules = lib.mkOption {
     type = lib.types.listOf lib.types.str;
     default = facterLib.stringSet (
-        facterLib.collectDrivers (
-          # A disk might be attached.
-          (report.hardware.firewire_controller or [ ])
-          # definitely important
-          ++ (report.hardware.disk or [ ])
-          ++ (report.hardware.storage_controller or [ ])
-        )
-      );
+      facterLib.collectDrivers (
+        # A disk might be attached.
+        (report.hardware.firewire_controller or [ ])
+        # definitely important
+        ++ (report.hardware.disk or [ ])
+        ++ (report.hardware.storage_controller or [ ])
+      )
+    );
     description = ''
       List of kernel modules that are needed to access the disk.
     '';
diff --git a/modules/nixos/facter.nix b/modules/nixos/facter.nix
index 6cd6128..a7bd8ac 100644
--- a/modules/nixos/facter.nix
+++ b/modules/nixos/facter.nix
@@ -18,7 +18,11 @@
   options.facter = with lib; {
     report = mkOption {
       type = types.raw;
-      default = if config.facter.reportPath == null then {} else builtins.fromJSON (builtins.readFile config.facter.reportPath);
+      default =
+        if config.facter.reportPath == null then
+          { }
+        else
+          builtins.fromJSON (builtins.readFile config.facter.reportPath);
       description = "An import for the reportPath.";
     };
 
diff --git a/modules/nixos/system.nix b/modules/nixos/system.nix
index c447ab6..173beee 100644
--- a/modules/nixos/system.nix
+++ b/modules/nixos/system.nix
@@ -6,6 +6,8 @@
 }:
 {
   nixpkgs = lib.mkIf (!options.nixpkgs.pkgs.isDefined) {
-    hostPlatform = lib.mkIf (config.facter.report.system or null != null) (lib.mkDefault config.facter.report.system);
+    hostPlatform = lib.mkIf (config.facter.report.system or null != null) (
+      lib.mkDefault config.facter.report.system
+    );
   };
 }
diff --git a/renovate.json b/renovate.json
index 5db72dd..d383718 100644
--- a/renovate.json
+++ b/renovate.json
@@ -1,6 +1,4 @@
 {
-  "$schema": "https://docs.renovatebot.com/renovate-schema.json",
-  "extends": [
-    "config:recommended"
-  ]
+    "$schema": "https://docs.renovatebot.com/renovate-schema.json",
+    "extends": ["config:recommended"]
 }