close method

@override Future<void> close()

Flush all pending data from the underlying IOSink, and close it. Returns a future that completes when the flush and close are finished. Calling this method more than once has no effect. See also done.

Implementation

@override
Future<void> close() {
  _lastClose ??= Future(() async {
    await flush();
    return _dest.close();
  });
  return _lastClose!;
}