namespace MediaWiki\Tidy;
+use MWException;
+
abstract class RaggettBase extends TidyDriverBase {
/**
* Generic interface for wrapping and unwrapping HTML for Dave Raggett's tidy.
* Perform a clean/repair operation
* @param string $text HTML to check
* @param bool $stderr Whether to read result from STDERR rather than STDOUT
- * @param int &$retval Exit code (-1 on internal error)
+ * @param int|null &$retval Exit code (-1 on internal error)
* @return null|string
* @throws MWException
*/