niobi-8.x-2.0-alpha4/modules/niobi_pages/niobi_pages.install

<?php

/**
 * @file
 */

use Drupal\user\Entity\Role;
use Drupal\user\RoleInterface;

/**
 * Implements hook_install().
 */
function niobi_pages_install() {
  \Drupal::service('config.installer')->installDefaultConfig('module', 'niobi_pages');
  $role_objects = Role::loadMultiple(['anonymous', 'authenticated']);
  foreach ($role_objects as $role_object) {
    $role_object->grantPermission('view niobi pages');
    $role_object->save();
  }

  $site_config = \Drupal::configFactory()->getEditable('system.site');
  $site_settings = $site_config->getOriginal('page');
  $site_settings['front'] = '/dashboard';
  $site_config->set('page', $site_settings)->save();

  \Drupal::messenger()->addMessage('Niobi Pages has been installed.');
}

/**
 * Implements hook_uninstall().
 */
function niobi_pages_uninstall() {
  \Drupal::service('config.manager')->uninstall('module', 'niobi_pages');

  // Set the homepage to something that shouldn't return a 404.
  $site_config = \Drupal::configFactory()->getEditable('system.site');
  $site_settings = $site_config->getOriginal('page');
  $site_settings['front'] = '/user';
  $site_config->set('page', $site_settings)->save();
}