1. DomName('SpeechSynthesis.getVoices')
  2. DocsEditable()
List<SpeechSynthesisVoice> getVoices()

Source 

@DomName('SpeechSynthesis.getVoices')
@DocsEditable()
List<SpeechSynthesisVoice> getVoices() => wrap_jso(_blink.BlinkSpeechSynthesis.instance.getVoices_Callback_0_(unwrap_jso(this)));