https://api.drupal.org/api/drupal/core%21modules%21system%21tests%21modules%21common_test%21src%21Render%21MainContent%21JsonRenderer.php/property/JsonRenderer%3A%3AtitleResolver/10
JsonRenderer::$titleResolver | Drupal API
drupalapi
https://api.drupal.org/api/drupal/core%21lib%21Drupal%21Core%21Controller%21TitleResolver.php/class/hierarchy/TitleResolver/9
TitleResolver | Drupal API
drupalapi