old_contents: /**
   * Copyright 2018, Google, Inc.
   * Licensed under the Apache License, Version 2.0 (the "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at
   *
   *    http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  
  'use strict';
  
  function listVoices() {
    // [START tts_list_voices]
    const textToSpeech = require('@google-cloud/text-to-speech');
  
    const client = new textToSpeech.TextToSpeechClient();
  
    client
      .listVoices({})
      .then(results => {
        const voices = results[0].voices;
  
        console.log('Voices:');
        voices.forEach(voice => {
          console.log(`Name: ${voice.name}`);
          console.log(`  SSML Gender: ${voice.ssmlGender}`);
          console.log(
            `  Natural Sample Rate Hertz: ${voice.naturalSampleRateHertz}`
          );
          console.log(`  Supported languages:`);
          voice.languageCodes.forEach(languageCode => {
            console.log(`    ${languageCode}`);
          });
        });
      })
      .catch(err => {
        console.error('ERROR:', err);
      });
    // [END tts_list_voices]
  }
  
  require(`yargs`) // eslint-disable-line
    .demand(1)
    .command(`list-voices`, `List supported voices.`, {}, opts => listVoices())
    .example(`node $0 list-voices`)
    .wrap(120)
    .recommendCommands()
    .epilogue(
      `For more information, see https://cloud.google.com/text-to-speech/docs`
    )
    .help()
    .strict().argv;
  
new_contents: /**
   * Copyright 2018, Google, Inc.
   * Licensed under the Apache License, Version 2.0 (the "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at
   *
   *    http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  
  'use strict';
  
  function listVoices() {
    // [START tts_list_voices]
    const textToSpeech = require('@google-cloud/text-to-speech');
  
    const client = new textToSpeech.TextToSpeechClient();
  
    client
      .listVoices({})
      .then(results => {
        const voices = results[0].voices;
  
        console.log('Voices:');
        voices.forEach(voice => {
          console.log(`Name: ${voice.name}`);
          console.log(`  SSML Gender: ${voice.ssmlGender}`);
          console.log(
            `  Natural Sample Rate Hertz: ${voice.naturalSampleRateHertz}`
          );
          console.log(`  Supported languages:`);
          voice.languageCodes.forEach(languageCode => {
            console.log(`    ${languageCode}`);
          });
        });
      })
      .catch(err => {
        console.error('ERROR:', err);
      });
    // [END tts_list_voices]
  }
  
  require(`yargs`) // eslint-disable-line
    .demand(1)
    .command(`list-voices`, `List supported voices.`, {}, () => listVoices())
    .example(`node $0 list-voices`)
    .wrap(120)
    .recommendCommands()
    .epilogue(
      `For more information, see https://cloud.google.com/text-to-speech/docs`
    )
    .help()
    .strict().argv;
  
subject: fix lint error for unused closure arg var