code: function createTempFile(options) {
    options = _.opts(options, {cleanup: true});
    return _createTemporaryPath((f) => fs.writeFileSync(f, ''), options.cleanup);
  }
docs: Create temporary file
  @function $os~createTempFile
  @param {Object} [options]
  @param {boolean} [options.cleanup=true] - Mark the file to be cleaned up on exit
  @returns {string} - Temporary file created
  @example
  // Create a temporary file that will be deleted at exit
  $os.createTempFile();
  // => '/tmp/1453824062535.702'
  @example
  // Create a temporary file but do not automatically clean it up at exit
  $os.createTempFile({cleanup: false});
  // => '/tmp/1453461306625.4946'