message = sprintf( 'Database upgrader class "%s" could not be loaded', $class ); } /** * @return array */ public function get_stages() { return [ 'invalid_upgrader' => $this->message, ]; } /** * @param Status $status * @return void */ public function perform_stage( Status $status ): void { $status->set_error( $this->message ); } /** * @param string $stage * @return list */ public function get_queries_for_stage( string $stage ): array { return []; } }