note: OK to use `AudioConfig.fromDefaultMicrophoneInput()`

[nfreear]

..

• GitHub: compulim/web-speech-cognitive-services ~ ../createSpeechRecognitionPonyfill.js;
• MS Docs: ...-speech-sdk/audioconfig;

const {
    audioConfig = AudioConfig.fromDefaultMicrophoneInput(),
    // ...
}

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