nixos-dotfiles/modules/boot/efi-grub.nix

{pkgs, ... }:
{
  boot.loader.grub.enable = true;
  boot.loader.grub.efiSupport = true;
  boot.loader.grub.efiInstallAsRemovable = true;
  boot.loader.grub.useOSProber = true;
  boot.loader.efi.efiSysMountPoint = "/boot";
  boot.loader.grub.device = "nodev";
}