https://docs.cloud.google.com/nodejs/docs/reference/text-to-speech/latest/text-to-speech/protos.google.cloud.texttospeech.v1beta1.isynthesizelongaudiometadata
Interface protos.google.cloud.texttospeech.v1beta1.ISynthesizeLongAudioMetadata (5.8.0) | Node.js...
google cloud