code: public function purgeScriptCache()
  	{
  		// assets/js and assets/css
  		foreach (array('assets/js', 'assets/css') as $dir)
  		{
  			// Purge the folder
  			$objFolder = new Folder($dir);
  			$objFolder->purge();
  		}
  
  		// Recreate the internal style sheets
  		$this->import(StyleSheets::class, 'StyleSheets');
  		$this->StyleSheets->updateStyleSheets();
  
  		// Also empty the page cache so there are no links to deleted scripts
  		$this->purgePageCache();
  
  		// Add a log entry
  		$this->log('Purged the script cache', __METHOD__, TL_CRON);
  	}
docs: Purge the script cache