Closes the current tab, terminating all contained panes. If that was the last tab, closes that window. If that was the last window, wezterm terminates.

return {
  keys = {
    {key="w", mods="CMD", action=wezterm.action.CloseCurrentTab{confirm=true}},

When confirm is true, an overlay will render over the tab to ask you to confirm whether you want to close it. See also skip_close_confirmation_for_processes_named.

If confirm is false then this action will immediately close the tab and terminates its panes without prompting.