property observation in Dart

partial.dart

/// Is Naurt's Locomotion running at the moment?
Future<bool> isRunning() {
  throw UnimplementedError('isRunning() has not been implemented.');
}
ValueChanged<bool>? onRunning;

/// Streams location changes
Stream<NaurtLocation> get onLocationChanged {
  throw UnimplementedError('onLocationChanged has not been implemented.');
}