unregister method

Future<void> unregister(
  1. String eventName,
  2. Function? callback
)

Unregisters a callback for the given event name.

Implementation

Future<void> unregister(String eventName, Function? callback) async {
  if (_callbacks.containsKey(eventName)) {
    var existed = _callbacks[eventName];
    existed?.remove(callback);
    _callbacks.remove(eventName);
    _callbacks.putIfAbsent(eventName, () => existed);
  }
  _eventsSubscription?.resume();
}