I’m trying to get the value of the node title when a page loads to pass that string to a module. I’m trying to follow the recent release documentation, and my build function contains the following code:

// get the page title   $  request = \Drupal::request();   $  route_match = \Drupal::routeMatch();   $  title = \Drupal::service('title_resolver')->getTitle($  request, $  route_match->getRouteObject());    if ($  node = \Drupal::routeMatch()->getParameter('node')) {     $  build['#attached']['library'][] = 'mycustomblock/custom';      $  build['#attached']['drupalSettings']['mycustomblock']['title'];   } 

In the console I’m getting an uncaught reference error because ‘title’ is undefined, maybe something wrong with the routing?

How can I get the title of the current node and pass it to my module?