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Wayland
While X11 (see ) is still the primary display technology on NixOS, Wayland support is steadily improving. Where X11 separates the X Server and the window manager, on Wayland those are combined: a Wayland Compositor is like an X11 window manager, but also embeds the Wayland 'Server' functionality. This means it is sufficient to install a Wayland Compositor such as sway without separately enabling a Wayland server:
{
programs.sway.enable = true;
}
This installs the sway compositor along with some essential utilities. Now you can start sway from the TTY console.
If you are using a wlroots-based compositor, like sway, and want to be able to share your screen, make sure to configure Pipewire using and related options.
For more helpful tips and tricks, see the wiki page about Sway.