diff --git a/format b/format
index 8fe8c2e61..5828f60d4 100755
--- a/format
+++ b/format
@@ -1,5 +1,5 @@
 #! /usr/bin/env nix-shell
-#! nix-shell -I nixpkgs=https://github.com/NixOS/nixpkgs/archive/b0bbacb52134a7e731e549f4c0a7a2a39ca6b481.tar.gz -i bash -p findutils nixfmt
+#! nix-shell -I nixpkgs=https://github.com/NixOS/nixpkgs/archive/05f0934825c2a0750d4888c4735f9420c906b388.tar.gz -i bash -p findutils nixfmt
 
 CHECK_ARG=
 
@@ -20,13 +20,11 @@ find . -name '*.nix' \
   \
   ! -path ./home-manager/default.nix \
   ! -path ./home-manager/home-manager.nix \
-  ! -path ./modules/accounts/email.nix \
   ! -path ./modules/default.nix \
   ! -path ./modules/files.nix \
   ! -path ./modules/home-environment.nix \
   ! -path ./modules/lib/default.nix \
   ! -path ./modules/lib/file-type.nix \
-  ! -path ./modules/lib/types.nix \
   ! -path ./modules/manual.nix \
   ! -path ./modules/misc/dconf.nix \
   ! -path ./modules/misc/gtk.nix \
@@ -59,8 +57,6 @@ find . -name '*.nix' \
   ! -path ./tests/modules/home-environment/session-variables.nix \
   ! -path ./tests/modules/programs/gpg/override-defaults.nix \
   ! -path ./tests/modules/programs/tmux/default.nix \
-  ! -path ./tests/modules/programs/tmux/disable-confirmation-prompt.nix \
-  ! -path ./tests/modules/programs/tmux/secure-socket-enabled.nix \
   ! -path ./tests/modules/programs/zsh/session-variables.nix \
   ! -path ./tests/modules/services/sxhkd/service.nix \
   ! -path ./tests/modules/systemd/default.nix \
diff --git a/modules/accounts/email.nix b/modules/accounts/email.nix
index b347e5bb1..a1970667b 100644
--- a/modules/accounts/email.nix
+++ b/modules/accounts/email.nix
@@ -106,7 +106,7 @@ let
 
       tls = mkOption {
         type = tlsModule;
-        default = {};
+        default = { };
         description = ''
           Configuration for secure connections.
         '';
@@ -136,7 +136,7 @@ let
 
       tls = mkOption {
         type = tlsModule;
-        default = {};
+        default = { };
         description = ''
           Configuration for secure connections.
         '';
@@ -209,7 +209,7 @@ let
 
       aliases = mkOption {
         type = types.listOf (types.strMatching ".*@.*");
-        default = [];
+        default = [ ];
         example = [ "webmaster@example.org" "admin@example.org" ];
         description = "Alternative email addresses of this account.";
       };
@@ -276,7 +276,7 @@ let
             };
           };
         };
-        default = {};
+        default = { };
         description = ''
           Standard email folders.
         '';
@@ -292,7 +292,7 @@ let
 
       signature = mkOption {
         type = signatureModule;
-        default = {};
+        default = { };
         description = ''
           Signature configuration.
         '';
@@ -332,9 +332,7 @@ let
       (mkIf (config.flavor == "gmail.com") {
         userName = mkDefault config.address;
 
-        imap = {
-          host = "imap.gmail.com";
-        };
+        imap = { host = "imap.gmail.com"; };
 
         smtp = {
           host = "smtp.gmail.com";
@@ -343,20 +341,14 @@ let
       })
 
       (mkIf (config.flavor == "runbox.com") {
-        imap = {
-          host = "mail.runbox.com";
-        };
+        imap = { host = "mail.runbox.com"; };
 
-        smtp = {
-          host = "mail.runbox.com";
-        };
+        smtp = { host = "mail.runbox.com"; };
       })
     ];
   };
 
-in
-
-{
+in {
   options.accounts.email = {
     certificatesFile = mkOption {
       type = types.path;
@@ -373,9 +365,7 @@ in
       default = "${config.home.homeDirectory}/Maildir";
       defaultText = "$HOME/Maildir";
       apply = p:
-        if hasPrefix "/" p
-        then p
-        else "${config.home.homeDirectory}/${p}";
+        if hasPrefix "/" p then p else "${config.home.homeDirectory}/${p}";
       description = ''
         The base directory for account maildir directories. May be a
         relative path, in which case it is relative the home
@@ -395,32 +385,24 @@ in
         (import ../programs/neomutt-accounts.nix)
         (import ../programs/notmuch-accounts.nix)
         (import ../programs/offlineimap-accounts.nix)
-      ] ++ optionals pkgs.stdenv.hostPlatform.isLinux [
-        (import ../services/lieer-accounts.nix)
-      ]));
-      default = {};
+      ] ++ optionals pkgs.stdenv.hostPlatform.isLinux
+        [ (import ../services/lieer-accounts.nix) ]));
+      default = { };
       description = "List of email accounts.";
     };
   };
 
-  config = mkIf (cfg.accounts != {}) {
+  config = mkIf (cfg.accounts != { }) {
     assertions = [
-      (
-        let
-          primaries =
-            catAttrs "name"
-            (filter (a: a.primary)
-            (attrValues cfg.accounts));
-        in
-          {
-            assertion = length primaries == 1;
-            message =
-              "Must have exactly one primary mail account but found "
-              + toString (length primaries)
-              + optionalString (length primaries > 1)
-                  (", namely " + concatStringsSep ", " primaries);
-          }
-      )
+      (let
+        primaries =
+          catAttrs "name" (filter (a: a.primary) (attrValues cfg.accounts));
+      in {
+        assertion = length primaries == 1;
+        message = "Must have exactly one primary mail account but found "
+          + toString (length primaries) + optionalString (length primaries > 1)
+          (", namely " + concatStringsSep ", " primaries);
+      })
     ];
   };
 }
diff --git a/modules/lib/types.nix b/modules/lib/types.nix
index f47f717c8..46db1157d 100644
--- a/modules/lib/types.nix
+++ b/modules/lib/types.nix
@@ -1,7 +1,5 @@
-{ lib
-, dag ? import ./dag.nix { inherit lib; }
-, gvariant ? import ./gvariant.nix { inherit lib; }
-}:
+{ lib, dag ? import ./dag.nix { inherit lib; }
+, gvariant ? import ./gvariant.nix { inherit lib; } }:
 
 with lib;
 
@@ -13,31 +11,25 @@ let
   # must refer back to the type.
   gvar = gvariant;
 
-in
-
-rec {
+in rec {
 
   inherit (typesDag) dagOf listOrDagOf;
 
   selectorFunction = mkOptionType {
     name = "selectorFunction";
-    description =
-      "Function that takes an attribute set and returns a list"
+    description = "Function that takes an attribute set and returns a list"
       + " containing a selection of the values of the input set";
     check = isFunction;
-    merge = _loc: defs:
-      as: concatMap (select: select as) (getValues defs);
+    merge = _loc: defs: as: concatMap (select: select as) (getValues defs);
   };
 
   overlayFunction = mkOptionType {
     name = "overlayFunction";
-    description =
-      "An overlay function, takes self and super and returns"
+    description = "An overlay function, takes self and super and returns"
       + " an attribute set overriding the desired attributes.";
     check = isFunction;
-    merge = _loc: defs:
-      self: super:
-        foldl' (res: def: mergeAttrs res (def.value self super)) {} defs;
+    merge = _loc: defs: self: super:
+      foldl' (res: def: mergeAttrs res (def.value self super)) { } defs;
   };
 
   fontType = types.submodule {
@@ -76,22 +68,21 @@ rec {
         # A bit naive to just check the first entry…
         sharedDefType = foldl' sameOrNull (head defTypes) defTypes;
         allChecked = all (x: check x) vals;
-      in
-        if sharedDefType == null then
-          throw ("Cannot merge definitions of `${showOption loc}' with"
-                 + " mismatched GVariant types given in"
-                 + " ${showFiles (getFiles defs)}.")
-        else if gvar.isArray sharedDefType && allChecked then
-          (types.listOf gvariant).merge
-            loc (map (d: d // { value = d.value.value; } ) vdefs)
-        else if gvar.isTuple sharedDefType && allChecked then
-          mergeOneOption loc defs
-        else if gvar.type.string == sharedDefType && allChecked then
-          types.str.merge loc defs
-        else if gvar.type.double == sharedDefType && allChecked then
-          types.float.merge loc defs
-        else
-          mergeDefaultOption loc defs;
+      in if sharedDefType == null then
+        throw ("Cannot merge definitions of `${showOption loc}' with"
+          + " mismatched GVariant types given in"
+          + " ${showFiles (getFiles defs)}.")
+      else if gvar.isArray sharedDefType && allChecked then
+        (types.listOf gvariant).merge loc
+        (map (d: d // { value = d.value.value; }) vdefs)
+      else if gvar.isTuple sharedDefType && allChecked then
+        mergeOneOption loc defs
+      else if gvar.type.string == sharedDefType && allChecked then
+        types.str.merge loc defs
+      else if gvar.type.double == sharedDefType && allChecked then
+        types.float.merge loc defs
+      else
+        mergeDefaultOption loc defs;
   };
 
 }
diff --git a/modules/programs/broot.nix b/modules/programs/broot.nix
index eac31b568..f0e1afee2 100644
--- a/modules/programs/broot.nix
+++ b/modules/programs/broot.nix
@@ -175,8 +175,8 @@ in {
     xdg.configFile."broot/launcher/installed".text = "";
 
     programs.bash.initExtra = mkIf cfg.enableBashIntegration (
-    # Using mkAfter to make it more likely to appear after other
-    # manipulations of the prompt.
+      # Using mkAfter to make it more likely to appear after other
+      # manipulations of the prompt.
       mkAfter ''
         # This script was automatically generated by the broot function
         # More information can be found in https://github.com/Canop/broot
diff --git a/modules/programs/direnv.nix b/modules/programs/direnv.nix
index beb40a962..de57727fd 100644
--- a/modules/programs/direnv.nix
+++ b/modules/programs/direnv.nix
@@ -82,8 +82,8 @@ in {
       mkIf (cfg.stdlib != "") { text = cfg.stdlib; };
 
     programs.bash.initExtra = mkIf cfg.enableBashIntegration (
-    # Using mkAfter to make it more likely to appear after other
-    # manipulations of the prompt.
+      # Using mkAfter to make it more likely to appear after other
+      # manipulations of the prompt.
       mkAfter ''
         eval "$(${pkgs.direnv}/bin/direnv hook bash)"
       '');
diff --git a/tests/modules/programs/tmux/disable-confirmation-prompt.nix b/tests/modules/programs/tmux/disable-confirmation-prompt.nix
index e3d13a4b1..9c65ad6ee 100644
--- a/tests/modules/programs/tmux/disable-confirmation-prompt.nix
+++ b/tests/modules/programs/tmux/disable-confirmation-prompt.nix
@@ -12,9 +12,7 @@ with lib;
     nixpkgs.overlays = [
       (self: super: {
         tmuxPlugins = super.tmuxPlugins // {
-          sensible = super.tmuxPlugins.sensible // {
-            rtp = "@sensible_rtp@";
-          };
+          sensible = super.tmuxPlugins.sensible // { rtp = "@sensible_rtp@"; };
         };
       })
     ];
diff --git a/tests/modules/programs/tmux/secure-socket-enabled.nix b/tests/modules/programs/tmux/secure-socket-enabled.nix
index 34e9129c5..7e8c535c0 100644
--- a/tests/modules/programs/tmux/secure-socket-enabled.nix
+++ b/tests/modules/programs/tmux/secure-socket-enabled.nix
@@ -11,7 +11,9 @@ with lib;
 
     nmt.script = ''
       assertFileExists home-path/etc/profile.d/hm-session-vars.sh
-      assertFileContent home-path/etc/profile.d/hm-session-vars.sh ${./hm-session-vars.sh}
+      assertFileContent home-path/etc/profile.d/hm-session-vars.sh ${
+        ./hm-session-vars.sh
+      }
     '';
   };
 }