How to use the botframework-webchat.createCognitiveServicesBingSpeechPonyfillFactory function in botframework-webchat

useEffect(() => {
    if (speech === 'bingspeech') {
      createCognitiveServicesBingSpeechPonyfillFactory({
        authorizationToken: () => fetchAndMemoizeBingSpeechAuthorizationToken(Date.now())
      }).then(webSpeechPonyfillFactory => setWebSpeechPonyfillFactory(() => webSpeechPonyfillFactory));
    } else if (speech === 'speechservices') {
      const webSpeechPonyfillFactory = createCognitiveServicesSpeechServicesPonyfillFactory({
        authorizationToken: () => fetchAndMemoizeSpeechServicesAuthorizationToken(Date.now()),
        region: 'westus2'
      });

      setWebSpeechPonyfillFactory(() => webSpeechPonyfillFactory);
    } else {
      setWebSpeechPonyfillFactory(() => createBrowserWebSpeechPonyfillFactory());
    }
  }, [speech, setWebSpeechPonyfillFactory]);