unsubscribe method
Implementation
Future<bool> unsubscribe() =>
promiseToFuture<bool>(JS("", "#.unsubscribe()", this));© 2012 the Dart project authors
Licensed under the BSD 3-Clause "New" or "Revised" License.
https://api.dart.dev/stable/2.18.5/dart-html/PushSubscription/unsubscribe.html