List<SpeechSynthesisVoice> getVoices() { List<SpeechSynthesisVoice> voices = _getVoices(); if (voices.length > 0) applyExtension('SpeechSynthesisVoice', voices[0]); return voices; }
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https://api.dartlang.org/stable/2.0.0/dart-html/SpeechSynthesis/getVoices.html