1{den, ...}: {
 2  den.aspects.desktop.includes = [den.aspects.desktop._.thumbnail];
 3
 4  den.aspects.desktop.provides.thumbnail.nixos = {pkgs, ...}: {
 5    services.tumbler.enable = true; # Thumbnail support
 6    environment.systemPackages = with pkgs; [
 7      # Image
 8      gdk-pixbuf
 9      libheif
10      libheif.out
11      webp-pixbuf-loader
12      # Video
13      ffmpeg-headless
14      ffmpegthumbnailer
15    ];
16  };
17}