cancel method

void cancel([
  1. Object? reason
])

Cancels the signal. reason is used to dereive the result of the future, using ConnectException.from.

Noop after the first call.

Implementation

void cancel([Object? reason]) {
  if (_completer.isCompleted) return;
  _completer.complete(
    super.errorFromReason(reason, Code.canceled, 'operation canceled'),
  );
}