src/Type/Definition/Type.php
public static function isBuiltInType(Type $type)
    {
        return in_array($type->name, array_keys(self::getAllBuiltInTypes()), true);
    }
public static function isBuiltInType(Type $type)
    {
        return in_array($type->name, array_keys(self::getAllBuiltInTypes()), true);
    }
public static function isBuiltInType ( Type $ type ) { return in_array ( $ type -> name , array_keys ( self :: getAllBuiltInTypes ( ) ) , true ) ; }
Checks if the type is a builtin type

@return bool
Checks if the type is a builtin type