public StorageInterface::deleteAll($prefix = '')
Deletes configuration objects whose names start with a given prefix.
Given the following configuration object names:
Passing the prefix 'node.type.' will delete the above configuration objects.
string $prefix: (optional) The prefix to search for. If omitted, all configuration objects that exist will be deleted.
bool TRUE on success, FALSE otherwise.
public function deleteAll($prefix = '');
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https://api.drupal.org/api/drupal/core!lib!Drupal!Core!Config!StorageInterface.php/function/StorageInterface::deleteAll/8.1.x