libraries.install

<?php

/**
 * @file
 * Containsinstall, uninstall and update functions for Libraries API.
 */

use Drupal\libraries\ExternalLibrary\Definition\FileDefinitionDiscovery;

/**
 * Implements hook_install().
 */
function libraries_install() {
  if (!is_dir('public://library-definitions')) {
    /** @var \Drupal\Core\File\FileSystemInterface $file_system */
    $file_system = \Drupal::service('file_system');
    $file_system->mkdir('public://library-definitions');
  }
}

/**
 * Implements hook_uninstall().
 */
function libraries_uninstall() {
  if (is_dir('public://library-definitions')) {
    \Drupal::service('file_system')->deleteRecursive('public://library-definitions');
  }
}