public function getRootDir(): string
    {
        if (null === $this->rootDir) {
            $this->rootDir = $this->getProjectDir().'/app';
        }

        return $this->rootDir;
    }
public function getRootDir(): string
    {
        if (null === $this->rootDir) {
            $this->rootDir = $this->getProjectDir().'/app';
        }

        return $this->rootDir;
    }
public function getRootDir ( ) : string { if ( null === $ this -> rootDir ) { $ this -> rootDir = $ this -> getProjectDir ( ) . '/app' ; } return $ this -> rootDir ; }
{@inheritdoc}

@deprecated since Symfony 4.2, use getProjectDir() instead
{ @inheritdoc }