NeverChangingValueListenable<T> for Flutter

never_changing_value_listenable.dart

import 'package:flutter/foundation.dart';

class NeverChangingValueListenable<T> implements ValueListenable<T> {
  const NeverChangingValueListenable(this.value);

  @override
  final T value;

  @override
  void addListener(VoidCallback listener) {}

  @override
  void removeListener(VoidCallback listener) {}
}