code: public static function parseType($source, array $options = [])
      {
          $sourceObj = $source instanceof Source ? $source : new Source($source);
          $parser    = new Parser($sourceObj, $options);
          $parser->expect(Token::SOF);
          $type = $parser->parseTypeReference();
          $parser->expect(Token::EOF);
  
          return $type;
      }
docs: Given a string containing a GraphQL Type (ex. `[Int!]`), parse the AST for
  that type.
  Throws `GraphQL\Error\SyntaxError` if a syntax error is encountered.
  
  This is useful within tools that operate upon GraphQL Types directly and
  in isolation of complete GraphQL documents.
  
  Consider providing the results to the utility function: `GraphQL\Utils\AST::typeFromAST()`.
  
  @param Source|string $source
  @param bool[]        $options
  
  @return ListTypeNode|NameNode|NonNullTypeNode
  
  @api