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<?php
function getEntityBundles(string $entity_type):array {
  $bundles = [];
  $entity_type_manager = \Drupal::entityTypeManager();
  $type = $entity_type_manager
    ->getDefinition($entity_type)
    ->getBundleEntityType();
  foreach ($entity_type_manager->getStorage($type)->loadMultiple() as $bundle) {
    $bundles[$bundle->id()] = $bundle;
  }
  return $bundles;
}