toJson method
Implementation
core.Map<core.String, core.dynamic> toJson() => {
if (customPronunciations != null)
'customPronunciations': customPronunciations!,
if (multiSpeakerMarkup != null)
'multiSpeakerMarkup': multiSpeakerMarkup!,
if (ssml != null) 'ssml': ssml!,
if (text != null) 'text': text!,
};