doOnData method
Invokes the given callback function when the Single emits an item. In other implementations, this is called doOnNext.
Example
Single.value(1)
.doOnData(print)
.listen(null); // prints 1
Implementation
Single<T> doOnData(void Function(T event) onData) => forwardSingleWithSink(
() => _DoStreamSingleSink(onDataCallback: onData), true);