Two way enum mapper

enum_mapper.dart

typedef EnumMapperCallback<T, E> = T Function(E value);

class EnumMapper<E, T> {
  EnumMapper(List<E> enumValues, EnumMapperCallback<T, E> mapper) {
    for (final enumValue in enumValues) {
      final key = enumValue;
      final value = mapper(enumValue);
      _forwardMap[key] = value;
      _inverseMap[value] = key;
    }
  }

  final _forwardMap = <E, T>{};
  final _inverseMap = <T, E>{};

  T fromEnum(E value) => _forwardMap[value];
  E toEnum(T value) => _inverseMap[value];
}

example.dart

enum Messenger { viber, telegram, facebook }

final mapper = EnumMapper(
  Messenger.values,
  (type) {
    switch (type) {
      case Messenger.viber:
        return 'viber';
      case Messenger.telegram:
        return 'telegram';
      case Messenger.facebook:
        return 'facebook';
    }
  },
);

void main() {
  final telegramEnumValue = mapper.toEnum('TELEGRAM');
  final telegramStringValue = mapper.fromEnum(Messenger.telegram);
}