environment.defaultPackages

Set of default packages that aren't strictly necessary for a running system, entries can be removed for a more minimal NixOS installation.

Like with systemPackages, packages are installed to /run/current-system/sw. They are automatically available to all users, and are automatically updated every time you rebuild the system configuration.

Type
list of package
Default

these packages, with their meta.priority numerically increased (thus lowering their installation priority):

[ pkgs.perl pkgs.rsync pkgs.strace ]
Example
[ ]
Declared
<nixpkgs/nixos/modules/config/system-path.nix>