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