src/Type/Definition/Type.php
public static function isOutputType($type)
    {
        return $type instanceof OutputType &&
            (
                ! $type instanceof WrappingType ||
                self::getNamedType($type) instanceof OutputType
            );
    }
public static function isOutputType($type)
    {
        return $type instanceof OutputType &&
            (
                ! $type instanceof WrappingType ||
                self::getNamedType($type) instanceof OutputType
            );
    }
@param Type $type

@return bool

@api