GObject.Object.prototype.connect_after

function connect(signal_name: String, handler: Function): Number(gint) {
    // Gjs wrapper for g_signal_connect()
}
  

Connects handler to signal_name on the object on which this method is invoked, and returns an integer ID different than 0 that can be passed to GObject.Object.prototype.disconnect

This is similar to GObject.Object.prototype.connect but the handler will always be invoked after the class implementation, if one exists.