D8 Modify default homepage

$homeNode = Node::create(array(
    'type' => 'node',
    'title' => 'Home page',
    'langcode' => 'en',
    'uid' => '1',
    'status' => 1,
    'promoted' => 1,
    'field_fields' => array(),
  ));
  $homeNode->save();
}

$page_front = '/node/' . $homeNode->id();

\Drupal::service('config.factory')
->getEditable('system.site')
->set('page.front', $page_front)
->save();