https://api.drupal.org/api/drupal/8.9.x/search/getAddRouteParameters
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https://api.drupal.org/api/drupal/core%21modules%21config_translation%21src%21ConfigMapperInterface.php/function/ConfigMapperInterface%3A%3AgetAddRouteParameters/11.x
function ConfigMapperInterface::getAddRouteParameters | Drupal API
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