9 methods override RouteEnhancerInterface::enhance()

AjaxEnhancer::enhance in drupal/core/lib/Drupal/Core/Routing/Enhancer/AjaxEnhancer.php
Update the defaults based on its own data and the request.
ContentControllerEnhancer::enhance in drupal/core/lib/Drupal/Core/Routing/Enhancer/ContentControllerEnhancer.php
Update the defaults based on its own data and the request.
EntityFormEnhancer::enhance in drupal/core/lib/Drupal/Core/Entity/Enhancer/EntityFormEnhancer.php
Update the defaults based on its own data and the request.
FieldByClassEnhancer::enhance in drupal/core/vendor/symfony-cmf/routing/Symfony/Cmf/Component/Routing/Enhancer/FieldByClassEnhancer.php
If the source field is instance of one of the entries in the map, target is set to the value of that map entry.
FieldMapEnhancer::enhance in drupal/core/vendor/symfony-cmf/routing/Symfony/Cmf/Component/Routing/Enhancer/FieldMapEnhancer.php
If the target field is not set but the source field is, map the field
FieldPresenceEnhancer::enhance in drupal/core/vendor/symfony-cmf/routing/Symfony/Cmf/Component/Routing/Enhancer/FieldPresenceEnhancer.php
Update the defaults based on its own data and the request.
FormEnhancer::enhance in drupal/core/lib/Drupal/Core/Routing/Enhancer/FormEnhancer.php
{@inhertdoc}
ParamConverterManager::enhance in drupal/core/lib/Drupal/Core/ParamConverter/ParamConverterManager.php
Implements \Symfony\Cmf\Component\Routing\Enhancer\ŖouteEnhancerIterface.
RouteContentEnhancer::enhance in drupal/core/vendor/symfony-cmf/routing/Symfony/Cmf/Component/Routing/Enhancer/RouteContentEnhancer.php
If the route has a non-null content and if that content class is in the injected map, returns that controller.