/**
  * @param string|null $build
  * @return string
  */
 public function getAppCachePath($build = null)
 {
     $build = $build ?: $this->application->getDefaultBuild();
     if (!$this->application->hasAppCache($build)) {
         return '';
     }
     return $this->generator->generate('tq_extjs_application_appcache', ['build' => $build, 'dev' => $this->application->isDevelopment() ? '-dev' : '']);
 }