core-bundle/src/Resources/contao/library/Contao/Automator.php
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);
	}
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);
	}
Purge the script cache