Stuck on an issue?

Lightrun Answers was designed to reduce the constant googling that comes with debugging 3rd party libraries. It collects links to all the places you might be looking at while hunting down a tough bug.

And, if you’re still stuck at the end, we’re happy to hop on a call to see how we can help out.

Disable Text-To-Speech issue

See original GitHub issue

Edited by @compulim to add what we should fix.

Description

My customer would like to enable the Speech-To-Text feature, but not the Text-To-Speech one. I tried to set to null the properties speechSynthesis and SpeechSynthesisUtterance but it’s not working. This is my code:

var _botConnection = new window.WebChat.createDirectLine({
      token: '{secret}'
});    
const subscriptionKey = 'xxxxxxxxxxxxxx';

async function createPonyfillFactory() {
       const webSpeechPonyfillFactory = await window.WebChat.createCognitiveServicesSpeechServicesPonyfillFactory({
       region: 'westeurope',
       speechRecognitionEndpointId: 'yyyyyyyyyyyyy',
       subscriptionKey
       });
       
     return options => {
            const webSpeechPonyfill = webSpeechPonyfillFactory(options);
                    return {
                        SpeechGrammarList: webSpeechPonyfill.SpeechGrammarList,
                        SpeechRecognition: webSpeechPonyfill.SpeechRecognition,
                        speechSynthesis: null,
                        SpeechSynthesisUtterance: null
                    }
                };
            };

 window.WebChat.renderWebChat({
       directLine: _botConnection,
       webSpeechPonyfillFactory: await createPonyfillFactory()
       },
       document.getElementById('webchat')
 );

This is the console output:

_webchat.js:1 TypeError: i is not a constructor
    at c (webchat.js:1)
    at webchat.js:1
    at c (webchat.js:1)
    at Generator._invoke (webchat.js:1)
    at Generator.e.<computed> [as next] (webchat.js:1)
    at n (webchat.js:1)
    at s (webchat.js:1)
    at webchat.js:1
    at new Promise (<anonymous>)
    at webchat.js:1_

The first interaction works fine, but after it the microphone icon is greyed out and you cannot dictate anymore.

Could you please help me? Thanks

What we should fix

(Will update this from time to time)

Current error:

createContext.js:25 TypeError: SpeechSynthesisUtterance is not a constructor
    at createNativeUtterance (QueuedUtterance.js:14)
    at _callee4$ (QueuedUtterance.js:58)
    at tryCatch (runtime.js:45)
    at Generator.invoke [as _invoke] (runtime.js:271)
    at Generator.prototype.<computed> [as next] (runtime.js:97)
    at asyncGeneratorStep (asyncToGenerator.js:3)
    at _next (asyncToGenerator.js:25)
    at eval (asyncToGenerator.js:32)
    at new Promise (<anonymous>)
    at eval (asyncToGenerator.js:21)

We need to prevent synthesizing if it is null/falsy. So something up this call stack need to be blocked.