Stores the path roots available in the router.
A path root is the first virtual directory of a path, like 'admin', 'node' or 'user'.
Type: array
protected $pathRoots;
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https://api.drupal.org/api/drupal/core!lib!Drupal!Core!EventSubscriber!PathRootsSubscriber.php/property/PathRootsSubscriber::pathRoots/8.1.x