Flarum\Extension\Extension::hasAssets PHP Метод

    public function hasAssets()
    {
        return realpath($this->path . '/assets/') !== false;
    }

 /**
  * Copy the assets from an extension's assets directory into public view.
  *
  * @param Extension $extension
  */
 protected function publishAssets(Extension $extension)
 {
     if ($extension->hasAssets()) {
         $this->filesystem->copyDirectory($extension->getPath() . '/assets', $this->app->basePath() . '/assets/extensions/' . $extension->getId());
     }
 }