Gio.bus_watch_name

function bus_watch_name(bus_type: Gio.BusType, name: String, flags: Gio.BusNameWatcherFlags, name_appeared_closure: Function, name_vanished_closure: Function): Number(guint) {
    // Gjs wrapper for g_bus_watch_name_with_closures()
}

Version of Gio.bus_watch_name using closures instead of callbacks for easier binding in other languages.

Since 2.26

bus_type: The type of bus to watch a name on.
name: The name (well-known or unique) to watch.
flags: Flags from the Gio.BusNameWatcherFlags enumeration.
name_appeared_closure: GObject.Closure to invoke when name is known to exist or null.
name_vanished_closure: GObject.Closure to invoke when name is known to not exist or null.
Returns: An identifier (never 0) that an be used with Gio.bus_unwatch_name to stop watching the name.