extend nixpkgs's lib instead

services/jellyfin.nix

@@ -3,23 +3,22 @@
   config,
   service_configs,
   username,
-  serviceMountDeps,
-  optimizePackage,
+  lib,
   ...
 }:
 {
   imports = [
-    (serviceMountDeps "jellyfin" [
+    (lib.serviceMountDeps "jellyfin" [
       config.services.jellyfin.dataDir
       config.services.jellyfin.cacheDir
-    ] pkgs)
+    ])
   ];
 
   services.jellyfin = {
     enable = true;
     # used for local streaming
     openFirewall = true;
-    package = pkgs.jellyfin.override { jellyfin-ffmpeg = (optimizePackage pkgs.jellyfin-ffmpeg); };
+    package = pkgs.jellyfin.override { jellyfin-ffmpeg = (lib.optimizePackage pkgs.jellyfin-ffmpeg); };
 
     dataDir = service_configs.jellyfin.dataDir;
     cacheDir = service_configs.jellyfin.cacheDir;