convert static method

Implementation

static String convert(String dictString) {
  if (dictString.isEmpty) {
    return '{}';
  }

  try {
    String result = _parseValue(dictString.trim());
    return result;
  } catch (e, stacktrace) {
    if (kDebugMode) {
      debugPrint('NSDictionary to JSON conversion failed: $e');
      debugPrint(stacktrace.toString());
    }
    return '{}';
  }
}