How to use the @google-cloud/text-to-speech.TextToSpeechClient function in @google-cloud/text-to-speech

async function listVoices() {
  // [START tts_list_voices]
  const textToSpeech = require('@google-cloud/text-to-speech');

  const client = new textToSpeech.TextToSpeechClient();

  const [result] = await client.listVoices({});
  const voices = result.voices;

  console.log('Voices:');
  voices.forEach(voice => {
    console.log(`Name: ${voice.name}`);
    console.log(`  SSML Voice Gender: ${voice.ssmlGender}`);
    console.log(`  Natural Sample Rate Hertz: ${voice.naturalSampleRateHertz}`);
    console.log(`  Supported languages:`);
    voice.languageCodes.forEach(languageCode => {
      console.log(`    ${languageCode}`);
    });
  });
  // [END tts_list_voices]
}

async function ssmlToAudio(ssmlText, outFile) {
    // Creates a client
    const client = new textToSpeech.TextToSpeechClient();

    // Constructs the request
    const request = {
      // Select the text to synthesize
      input: {ssml: ssmlText},
      // Select the language and SSML Voice Gender (optional)
      voice: {languageCode: 'en-US', ssmlGender: 'MALE'},
      // Select the type of audio encoding
      audioConfig: {audioEncoding: 'MP3'},
    };

    // 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(outFile, response.audioContent, 'binary');

function main(
){
  // [START tts_quickstart]
  // Imports the Google Cloud client library
  const textToSpeech = require('@google-cloud/text-to-speech');

  // Import other required libraries
  const fs = require('fs');
  const util = require('util');
  // 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', ssmlGender: 'NEUTRAL'},
      // select the type of audio encoding
      audioConfig: {audioEncoding: 'MP3'},
    };

    // Performs the text-to-speech request
    const [response] = await client.synthesizeSpeech(request);

async function synthesizeTextFile(textFile, outputFile) {
  // [START tts_synthesize_text_file]
  const textToSpeech = require('@google-cloud/text-to-speech');
  const fs = require('fs');
  const util = require('util');

  const client = new textToSpeech.TextToSpeechClient();

  /**
   * TODO(developer): Uncomment the following lines before running the sample.
   */
  // const textFile = 'Local path to text file, eg. input.txt';
  // const outputFile = 'Local path to save audio file to, e.g. output.mp3';

  const request = {
    input: {text: fs.readFileSync(textFile)},
    voice: {languageCode: 'en-US', ssmlGender: 'FEMALE'},
    audioConfig: {audioEncoding: 'MP3'},
  };

  const [response] = await client.synthesizeSpeech(request);
  const writeFile = util.promisify(fs.writeFile);
  await writeFile(outputFile, response.audioContent, 'binary');

async function syntheticAudio(text, outFile) {
    // Replace special characters with HTML Ampersand Character Codes
    // These codes prevent the API from confusing text with SSML tags
    // For example, '<' --> '<' and '&' --> '&'
    let escapedLines = text.replace(/&/g, '&');
    escapedLines = escapedLines.replace(/"/g, '"');
    escapedLines = escapedLines.replace(//g, '>');

    // Convert plaintext to SSML
    // Tag SSML so that there is a 2 second pause between each address
    const expandedNewline = escapedLines.replace(/\n/g, '\n');
    const ssmlText = '' + expandedNewline + '';

    // Creates a client
    const client = new textToSpeech.TextToSpeechClient();

    // Constructs the request
    const request = {
      // Select the text to synthesize
      input: {ssml: ssmlText},
      // Select the language and SSML Voice Gender (optional)
      voice: {languageCode: 'en-US', ssmlGender: 'MALE'},
      // Select the type of audio encoding
      audioConfig: {audioEncoding: 'MP3'},
    };

    // 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(outFile, response.audioContent, 'binary');

it('should have an underlying Google Cloud object', () => {
      expect(provider.instance).toEqual(jasmine.any(TextToSpeechClient))
    })

function main() {
  const textToSpeechClient = new TextToSpeechClient();
}

const textToSpeech = require('@google-cloud/text-to-speech');
const fs = require('fs');
const crypto = require('crypto');

const config = {
  keyFilename: './keyfile.json'
};

const client = new textToSpeech.TextToSpeechClient(config);

const text = 'this is a test message!';
const hash = crypto.createHash('md5').update(text).digest('hex');
const xml = 
`
  /xml/${hash}.xml
`

const request = {
  input: {
    text: text
  },
  voice: {
    languageCode: 'en-US',
    name: 'en-US-Wavenet-F',
    ssmlGender: 'FEMALE'

function getTtsAudio(str, cb) {
  const ttsClient = new TextToSpeech.TextToSpeechClient();
  const ttsRequest = {
    input: { text: str },
    voice: { languageCode: 'en-US', name: 'en-US-Wavenet-F', ssmlGender: 'FEMALE' },
    audioConfig: { audioEncoding: 'MP3' },
  };

  ttsClient.synthesizeSpeech(ttsRequest, (err, res) => {
    if (err) { cb(err, null); }
    else { cb(null, res.audioContent); }
  });
}