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How do I get the output of a field of a node? I have some weird subpage construct using entity references (one 'main' node and a few 'sub'-nodes).

Each of these nodes have a header image to be displayed above the content. What I am trying to do is for the sub-nodes to 'inherit' the header image of the main node.

I implemented hook_node_view and I have got the node, I just don't know how to build the renderable array for it.

function hook_node_view(array &$build, \Drupal\Core\Entity\EntityInterface $entity, \Drupal\Core\Entity\Display\EntityViewDisplayInterface $display, $view_mode) {
  if($view_mode == 'full'){
    if((!isset($build['field_headerimage']) || !isset($build['field_headerimage'][0])) && $entity->hasField('field_location')){
      $location = $entity->get('field_location')->referencedEntities();
      if(is_array($location) && isset($location[0])) {
        $node = $location[0];
        dsm('yay, now what?');
        dsm($node->label());
      }
    }
  }
}
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The answer to my own question seems to be like so:

$build['field_headerimage'] = $node->get('field_headerimage')->view();

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