Streams with click

main.dart

import 'dart:html';

void main() {
  final ButtonElement button = querySelector('button') as ButtonElement;

  button.onClick
    .timeout(
      Duration(seconds: 1),
      onTimeout: (sink) => sink.addError("You have lost")
    ).listen(
      (event) {},
      onError: (err) => print(err)
    );
}