public function getVendorDir()
{
/* old vendor folder to give backward compatibility */
$vendorFolder = $this->getConfigurationLoaderDir() . '/../../../../vendor';
if (is_dir($vendorFolder)) {
return $vendorFolder;
}
/* correct vendor folder for composer installations */
$vendorFolder = $this->getConfigurationLoaderDir() . '/../../../../../../../vendor';
if (is_dir($vendorFolder)) {
return $vendorFolder;
}
return '';
}