Using watson TTS for ruby name error.

name_error_tts.js

var watson = require('watson-developer-cloud');
var fs     = require('fs');
var exec   = require('child_process').exec;

var text_to_speech = watson.text_to_speech({
  username: 'xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx',
  password: 'xxxxxxxxxxxxxxxxx',
  version: 'v1'
});

var params = {
  text: '<p><s><prosody rate=\'slow\'>name error</prosody> on 43<break time=\'0.25s\'/>7.</s></p>',
  voice: 'en-US_AllisonVoice', // Optional voice
  accept: 'audio/wav'
};

// Pipe the synthesized text to a file
synth = text_to_speech.synthesize(params);
synth.pipe(fs.createWriteStream('output.wav'));
synth.on('end', () => {
  exec('aplay output.wav',
    function (error, stdout, stderr) {
      console.log(`stdout: ${stdout}`);
      console.log(`stderr: ${stderr}`);
      if (error !== null) {
        console.log(`exec error: ${error}`);
      }
    }
  );
});