dynamic noSuchMethod(invoke)

Invoked when a non-existent method or property is accessed.

Classes can override noSuchMethod to provide custom behavior.

If a value is returned, it becomes the result of the original invocation.

The default behavior is to throw a NoSuchMethodError.

Source 

noSuchMethod(invoke) {
  log('${invoke.memberName}(${invoke.positionalArguments}, '
      '${invoke.namedArguments}) called');
  if (invoke.isMethod) return new Future.value(false);
}