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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.

config.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.