doOnListen method

Single<T> doOnListen(
  1. void onListen()
)

Invokes the given callback function when the Single is first listened to.

Example

Single.value(1)
  .doOnListen(() => print('Is someone there?'))
  .listen(null); // prints 'Is someone there?'

Implementation

Single<T> doOnListen(void Function() onListen) => forwardSingleWithSink(
    () => _DoStreamSingleSink(onListenCallback: onListen), true);