SpeechSynthesisErrorCode
type SpeechSynthesisErrorCode =
| "audio-busy"
| "audio-hardware"
| "canceled"
| "interrupted"
| "invalid-argument"
| "language-unavailable"
| "network"
| "not-allowed"
| "synthesis-failed"
| "synthesis-unavailable"
| "text-too-long"
| "voice-unavailable";