add abstract method Null safety
- T data
override
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.
Implementation
void add(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.
void add(T data);