T data
) Adds event to the controller's stream.
As StreamController.add, but must not be called while an event is being added by add, addError or close.
Source
/**
* Adds event to the controller's stream.
*
* As [StreamController.add], but must not be called while an event is
* being added by [add], [addError] or [close].
*/
void add(T data);