doOnListen method

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

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

Example

Stream.fromIterable([1])
  .doOnListen(() => print('Is someone there?'))
  .listen(null); // prints 'Is someone there?'

Implementation

Stream<T> doOnListen(void Function() onListen) =>
    DoStreamTransformer<T>(onListen: onListen).bind(this);