Speech generation via Google Text-to-Speech API

generate-speech.js

/**
  https://cloud.google.com/text-to-speech/docs/create-audio-text-client-libraries#client-libraries-usage-nodejs
  
  ### USAGE
  
  * [Setup your googleplatform project](https://cloud.google.com/text-to-speech/docs/before-you-begin)
    and download a service account json key.
  * run below.
  
  ```
  npm init
  npm install @google-cloud/text-to-speech
  env GOOGLE_APPLICATION_CREDENTIALS=/path/to/your/service-account-key.json node generate-speech.js
  ```
**/

// Imports the Google Cloud client library
import textToSpeech from '@google-cloud/text-to-speech'

// Import other required libraries
import fs from 'fs'
import util from 'util'

const SAMPLE_RATE = 11025;

// Creates a client
const client = new textToSpeech.TextToSpeechClient();
async function quickStart() {
  // The text to synthesize
  const text = 'hello, world!';

  // Construct the request
  const request = {
    input: { text: text },
    // Select the language and SSML voice gender (optional)
    voice: { languageCode: 'en-US', name: 'en-US-Wavenet-F', ssmlGender: 'NEUTRAL' },
    // select the type of audio encoding
    audioConfig: { audioEncoding: 'LINEAR16', sampleRateHertz: SAMPLE_RATE },
  };

  // Performs the text-to-speech request
  const [response] = await client.synthesizeSpeech(request);
  // Write the binary audio content to a local file
  const writeFile = util.promisify(fs.writeFile);
  await writeFile('output.wav', response.audioContent, 'binary');
  console.log('Audio content written to file: output.wav');
}
quickStart();