watson-speech/speech-to-text/to-promise.js

IBM Watson Speech to Text and Text to Speech SDK for web browsers.

'use strict';

/**
 * Helper method that can be bound to a stream - it sets the output to utf-8, captures all of the results, and returns a promise that resolves to the final text.
 * Essentially a smaller version of concat-stream wrapped in a promise
 *
 * @param {Stream} [stream=] optional stream param for when not bound to an existing stream instance
 * @return {Promise}
 */
module.exports = function promise(stream) {
  stream = stream || this;
  return new Promise(function(resolve, reject) {
    var results = [];
    stream
      .on('data', function(result) {
        results.push(result);
      })
      .on('end', function() {
        resolve(Buffer.isBuffer(results[0]) ? Buffer.concat(results).toString() : results);
      })
      .on('error', reject);
  });
};