LinkProvider(String brokerUrl, String prefix, { Map<String, dynamic> defaultNodes, Map<String, NodeFactory> profiles, NodeProvider provider, DataStorage dataStore, bool loadNodes: false, bool isRequester: true, bool isResponder: true, String token })

Source 

LinkProvider(this.brokerUrl, this.prefix,
    {this.defaultNodes,
    this.profiles,
    this.provider,
    this.dataStore,
    this.loadNodes: false,
    this.isRequester: true,
    this.isResponder: true,
    this.token}) {
  if (dataStore == null) {
    dataStore = LocalDataStorage.INSTANCE;
  }
}