String prettyJson(obj) {
  try {
    return const JsonEncoder.withIndent(' ').convert(obj);
  } on JsonUnsupportedObjectError catch (e) {
    var error = e;

    while (error is JsonUnsupportedObjectError) {
      stderr.writeln([
        error,
        "${error.unsupportedObject} - (${error.unsupportedObject.runtimeType})",
        error.cause == null ? null : "Nested cause: ${error.cause}",
        error.stackTrace
      ].where((i) => i != null).join('\n'));

      error = error.cause;
    }
    rethrow;
  }
}