Read file as Stream in dart

ReadFileStream.dart

void readFileStream() {
  Stream<List<int>> stream = new File('./assets/user.json').openRead();
  StringBuffer buffer = new StringBuffer();
  stream
    .transform(utf8.decoder)
    .listen((data) {
      buffer.write(data);
    },
    onDone: () => print(buffer.toString()),
    onError: (e) => print(e));
}