GraphQL\Language\Parser::parseSchemaDefinition PHP Method

    function parseSchemaDefinition()
    {
        $start = $this->lexer->token;
        $this->expectKeyword('schema');
        $directives = $this->parseDirectives();
        $operationTypes = $this->many(Token::BRACE_L, [$this, 'parseOperationTypeDefinition'], Token::BRACE_R);
        return new SchemaDefinitionNode(['directives' => $directives, 'operationTypes' => $operationTypes, 'loc' => $this->loc($start)]);
    }