diff --git a/home/applications/sway/default.nix b/home/applications/sway/default.nix
index bc0e5dc..72ac112 100644
--- a/home/applications/sway/default.nix
+++ b/home/applications/sway/default.nix
@@ -36,15 +36,13 @@
     config = {
       ### Visuals
       output."*".bg = "${inputs.self.legacyPackages.${pkgs.stdenv.hostPlatform.system}.background} fill";
-      bars = [
-        {
-          statusCommand = "${lib.getExe pkgs.i3status-rust} $HOME/.config/i3status-rust/config-default.toml";
-          position = "top";
-          extraConfig = ''
-            icon_theme ${config.gtk.iconTheme.name}
-          '';
-        }
-      ];
+      bars = lib.singleton {
+        statusCommand = "${lib.getExe pkgs.i3status-rust} $HOME/.config/i3status-rust/config-default.toml";
+        position = "top";
+        extraConfig = ''
+          icon_theme ${config.gtk.iconTheme.name}
+        '';
+      };
 
       ### Inputs
       input = {
diff --git a/hosts/blacksteel/hardware-configuration.nix b/hosts/blacksteel/hardware-configuration.nix
index 3aa5270..67079a9 100644
--- a/hosts/blacksteel/hardware-configuration.nix
+++ b/hosts/blacksteel/hardware-configuration.nix
@@ -1,4 +1,5 @@
 {
+  lib,
   inputs,
   config,
   ...
@@ -43,7 +44,5 @@
       fsType = "vfat";
     };
   };
-  swapDevices = [
-    { device = "/dev/disk/by-uuid/8a2e90a9-5cc2-40fc-82fe-69ef3cd88e29"; }
-  ];
+  swapDevices = lib.singleton { device = "/dev/disk/by-uuid/8a2e90a9-5cc2-40fc-82fe-69ef3cd88e29"; };
 }
diff --git a/hosts/blacksteel/services/matrix.nix b/hosts/blacksteel/services/matrix.nix
index c573905..7c266e7 100644
--- a/hosts/blacksteel/services/matrix.nix
+++ b/hosts/blacksteel/services/matrix.nix
@@ -1,4 +1,4 @@
-{ config, ... }:
+{ lib, config, ... }:
 {
   services.matrix-synapse = {
     enable = true;
@@ -13,15 +13,13 @@
         {
           path = "/run/matrix-synapse/synapse.sock";
           type = "http";
-          resources = [
-            {
-              names = [
-                "client"
-                "federation"
-              ];
-              compress = true;
-            }
-          ];
+          resources = lib.singleton {
+            names = [
+              "client"
+              "federation"
+            ];
+            compress = true;
+          };
         }
       ];
 
@@ -32,25 +30,23 @@
       };
 
       # https://element-hq.github.io/synapse/latest/openid.html#keycloak
-      oidc_providers = [
-        {
-          idp_id = "keycloak";
-          idp_name = "id.ny4.dev";
-          issuer = "https://id.ny4.dev/realms/ny4";
-          client_id = "synapse";
-          client_secret_path = config.sops.secrets."synapse/oidc".path;
-          scopes = [
-            "openid"
-            "profile"
-          ];
-          user_mapping_provider.config = {
-            localpart_template = "{{ user.preferred_username }}";
-            display_name_template = "{{ user.name }}";
-          };
-          backchannel_logout_enabled = true;
-          allow_existing_users = true;
-        }
-      ];
+      oidc_providers = lib.singleton {
+        idp_id = "keycloak";
+        idp_name = "id.ny4.dev";
+        issuer = "https://id.ny4.dev/realms/ny4";
+        client_id = "synapse";
+        client_secret_path = config.sops.secrets."synapse/oidc".path;
+        scopes = [
+          "openid"
+          "profile"
+        ];
+        user_mapping_provider.config = {
+          localpart_template = "{{ user.preferred_username }}";
+          display_name_template = "{{ user.name }}";
+        };
+        backchannel_logout_enabled = true;
+        allow_existing_users = true;
+      };
     };
   };
 
diff --git a/hosts/tyo0/default.nix b/hosts/tyo0/default.nix
index 9e4d961..f35737d 100644
--- a/hosts/tyo0/default.nix
+++ b/hosts/tyo0/default.nix
@@ -25,12 +25,10 @@
   boot.loader.grub.device = lib.mkForce "/dev/nvme0n1";
   system.stateVersion = "24.05";
 
-  swapDevices = [
-    {
-      device = "/var/lib/swapfile";
-      size = 4 * 1024; # 4 GiB
-    }
-  ];
+  swapDevices = lib.singleton {
+    device = "/var/lib/swapfile";
+    size = 4 * 1024; # 4 GiB
+  };
 
   # WORKAROUND:
   systemd.services."print-host-key".enable = false;
diff --git a/hosts/tyo0/services/sing-box.nix b/hosts/tyo0/services/sing-box.nix
index 826d5ce..8b8b247 100644
--- a/hosts/tyo0/services/sing-box.nix
+++ b/hosts/tyo0/services/sing-box.nix
@@ -1,4 +1,4 @@
-{ config, ... }:
+{ lib, config, ... }:
 {
   networking.firewall.allowedTCPPorts = [
     27253
@@ -30,12 +30,10 @@
         }
       ];
 
-      outbounds = [
-        {
-          type = "direct";
-          tag = "direct";
-        }
-      ];
+      outbounds = lib.singleton {
+        type = "direct";
+        tag = "direct";
+      };
 
       route = {
         final = "direct";
diff --git a/nixos/profiles/sing-box/default.nix b/nixos/profiles/sing-box/default.nix
index 5352145..334e663 100644
--- a/nixos/profiles/sing-box/default.nix
+++ b/nixos/profiles/sing-box/default.nix
@@ -12,16 +12,14 @@
         level = "info";
       };
 
-      inbounds = [
-        {
-          type = "http";
-          tag = "inbound";
-          listen = "127.0.0.1";
-          listen_port = 1080;
-          sniff = true;
-          sniff_override_destination = true;
-        }
-      ];
+      inbounds = lib.singleton {
+        type = "http";
+        tag = "inbound";
+        listen = "127.0.0.1";
+        listen_port = 1080;
+        sniff = true;
+        sniff_override_destination = true;
+      };
 
       outbounds = [
         {