_types_with_archive as $post_type_with_archive ) {
			$post_types[] = $post_type_with_archive->name;
		}

		return $post_types;
	}

	/**
	 * Retrieves the list of post type names for which an archive indexable exists.
	 *
	 * @return array The list of names of post types with unindexed archive pages.
	 */
	private function get_indexed_post_type_archives() {
		$results = $this->repository->query()
			->select( 'object_sub_type' )
			->where( 'object_type', 'post-type-archive' )
			->find_array();

		if ( $results === false ) {
			return [];
		}

		$callback = function( $result ) {
			return $result['object_sub_type'];
		};
		return \array_map( $callback, $results );
	}
}