system_theme_suggestions_page

system_theme_suggestions_page(array $variables)

function system_theme_suggestions_page(array $variables) {
  if (\Drupal::service('path.matcher')->isFrontPage()) {
    $path_args = [''];
  }
  else {
    $path_args = explode('/', Url::fromRoute('<current>')->getInternalPath());
  }
  return theme_get_suggestions($path_args, 'page');
}