clearCache method

@override Future<void> clearCache()

Implementation

@override
Future<void> clearCache() async {
  // Outputs are blob: URLs, which the browser keeps alive for the whole page
  // unless revoked. Release every URL this engine handed out.
  //
  // If the engine never loaded it never minted a URL, so there is nothing to
  // free — don't fetch the script just to iterate an empty set.
  if (!_engineReady) return;
  _jsRevokeAll();
}