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cancel_subscriptions

Uncancelled instance of 'StreamSubscription'.

Description

#

The analyzer produces this diagnostic when an instance of StreamSubscription is created but the method cancel isn't invoked.

Example

#

The following code produces this diagnostic because the subscription isn't canceled:

dart
import 'dart:async';

void f(Stream stream) {
  // ignore: unused_local_variable
  var subscription = stream.listen((_) {});
}

Common fixes

#

Cancel the subscription:

dart
import 'dart:async';

void f(Stream stream) {
  var subscription = stream.listen((_) {});
  subscription.cancel();
}