AVSpeechSynthesizer output as file?

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This is finally possible, in iOS 13 AVSpeechSynthesizer now has write(_:toBufferCallback:):

let synthesizer = AVSpeechSynthesizer()
let utterance = AVSpeechUtterance(string: "test 123")
utterance.voice = AVSpeechSynthesisVoice(language: "en")
var output: AVAudioFile?

synthesizer.write(utterance) { (buffer: AVAudioBuffer) in
   guard let pcmBuffer = buffer as? AVAudioPCMBuffer else {
      fatalError("unknown buffer type: \(buffer)")
   }
   if pcmBuffer.frameLength == 0 {
     // done
   } else {
     // append buffer to file
     if output == nil { 
       output = AVAudioFile(
         forWriting: URL(fileURLWithPath: "test.caf"), 
         settings: pcmBuffer.format.settings, 
         commonFormat: .pcmFormatInt16, 
         interleaved: false) 
     }
     output?.write(from: pcmBuffer)
   } 
}

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