https://api.drupal.org/api/drupal/core%21modules%21book%21src%21Form%21BookSettingsForm.php/class/hierarchy/BookSettingsForm/8.9.x
BookSettingsForm | Drupal API
drupalapi
https://api.drupal.org/api/drupal/core%21modules%21book%21src%21Form%21BookSettingsForm.php/function/BookSettingsForm%3A%3AgetEditableConfigNames/8.9.x
function BookSettingsForm::getEditableConfigNames | Drupal API
functiondrupalapi
https://api.drupal.org/api/drupal/core%21modules%21book%21src%21Form%21BookSettingsForm.php/8.9.x
BookSettingsForm.php | Drupal API
phpdrupalapi