emit method
Implementation
void emit (String customId, dynamic payload) {
  final collector = _collectors.values.firstWhereOrNull((element) => element.customId == customId);
  if (collector != null) {
    collector.handle(payload);
  }
}void emit (String customId, dynamic payload) {
  final collector = _collectors.values.firstWhereOrNull((element) => element.customId == customId);
  if (collector != null) {
    collector.handle(payload);
  }
}