Function field return type in Dart

Question

In the following class I want to type the onPress method as a function which returns void. Is there a way to do that?

class Human {
  var onPress;

  Human({
    this.onPress,
  });
}

Answer 1

class Human {
  void Function() onPress;

  Human({
    this.onPress,
  });
}

or

typedef VoidFunction = void Function();

class Human {
  VoidFunction onPress;

  Human({
    this.onPress,
  });
}