code: function readTxtSync(filePath, opts_) {
    var parserOptions;
    if (typeof opts_ !== 'undefined') {
      parserOptions = typeof opts_ === 'function' ? { map: opts_ } : opts_;
    }
    return readDataSync(filePath, { parser: parserTxt, parserOptions: parserOptions });
  }
docs: Synchronously read a text file. Returns an empty string if file is empty.
  
  @function readTxtSync
  @param {String} filePath Input file path
  @param {Function|Object} [map] Optional map function or an object with `map` key that is a function. Takes the file read in as text and must return the modified file. See example below.
  @returns {String} the contents of the file as a string
  
  @example
  var data = io.readTxtSync('path/to/data.txt')
  console.log(data) // string data
  
  var data = io.readTxtSync('path/to/data.txt', function (str) {
  return str.replace(/hello/g, 'goodbye') // Replace all instances of `"hello"` with `"goodbye"`
  })
  console.log(data) // string data with values replaced