Sulu\Bundle\PreviewBundle\Preview\Renderer\PreviewKernel::getRootDir PHP Method

    public function getRootDir()
    {
        if (null === $this->rootDir) {
            $reflectionClass = new \ReflectionClass(\WebsiteKernel::class);
            $this->rootDir = dirname($reflectionClass->getFileName());
        }
        return $this->rootDir;
    }