onError abstract method

void onError(Function handleError)

Set or override the error event handler of this subscription.

This method overrides the handler that has been set at the invocation of Stream.listen or by calling asFuture.

Source

void onError(Function handleError);

© 2012 the Dart project authors
Licensed under the Creative Commons Attribution-ShareAlike License v4.0.
https://api.dartlang.org/stable/1.24.3/dart-async/StreamSubscription/onError.html