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How to get node information in RouteSubscriberBase::alterRoutes

what I’m trying to achieve, is to for some specific nodes set admin theme. I have defined RouteSubscriberBase but how can I get node information here? This code is not working $node = Drupal::routeMatch()->getParameter(‘node’);

$route->getPath() will return /node/{node}

class RouteSubscriber extends RouteSubscriberBase {      /**      * {@inheritdoc}      */     public function alterRoutes(RouteCollection $collection)     {         if ($route = $collection->get('entity.node.canonical')) {             $node = Drupal::routeMatch()->getParameter('node');             // dpm($node); - this will be null             if ($nid == 123) {                 $route->setOption('_node_operation_route', TRUE);             }         }     }  }
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How to get node information in RouteSubscriberBase::alterRoutes

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