drupal/core/modules/block/block.install

<?php

/**
 * @file
 * Contains install and update functions for Block.
 */

use Drupal\Core\Cache\Cache;

/**
 * Implements hook_install().
 */
function block_install() {
  // Because the Block module upon installation unconditionally overrides all
  // HTML output by selecting a different page display variant, we must
  // invalidate all cached HTML output.
  Cache::invalidateTags(['rendered']);
}

/**
 * Implements hook_update_last_removed().
 */
function block_update_last_removed() {
  return 8003;
}