DataStorage constructor
      
      DataStorage(
    
    
- String id, [
- DataStorageType storageType = DataStorageType.session
Implementation
DataStorage(this.id, [this.storageType = DataStorageType.session]) {
  if (!isValidKeyName(id)) {
    throw ArgumentError('Invalid DataStorage id: $id');
  }
  _simpleStorage = storageType == DataStorageType.persistent
      ? _persistentStorage
      : _sessionStorage;
}