addTokenChangedCallback method

UnsubscribeDelegate addTokenChangedCallback(
  1. TokenChangedCallback callback
)

Add a callback that will be invoked when the service's token changes.

The returned function will remove the callback when called.

Implementation

UnsubscribeDelegate addTokenChangedCallback(TokenChangedCallback callback) {
  _tokenChangedCallbacks.add(callback);
  return () {
    _tokenChangedCallbacks.removeWhere((element) => element == callback);
  };
}