PHPStan 1.9 features

src/utils/Process.php

@@ -152,6 +152,8 @@ final class Process{
 	 * @param string      $command Command to execute
 	 * @param string|null $stdout Reference parameter to write stdout to
 	 * @param string|null $stderr Reference parameter to write stderr to
+	 * @phpstan-param-out string $stdout
+	 * @phpstan-param-out string $stderr
 	 *
 	 * @return int process exit code
 	 */