dispose method

@override Future<void> dispose()

Cancels the input subscription and releases resources.

Must be called when the program is done reading terminal input; otherwise the live input subscription keeps the process from exiting.

Implementation

@override
Future<void> dispose() async {
  final subscription = _inputSubscription;
  final controller = _inputController;
  _inputSubscription = null;
  _inputController = null;
  await subscription?.cancel();
  if (controller != null && !controller.isClosed) {
    await controller.close();
  }
}