code: function discernFileFormatter(filePath) {
    var format = discernFormat(filePath);
    var formatter = formatters[format];
    // If we don't have a parser for this format, return as text
    if (typeof formatter === 'undefined') {
      formatter = formatters['txt'];
    }
    return formatter;
  }
docs: Returns a formatter that will format json data to file type specified by the extension in `filePath`. Used internally by {@link writeData} and {@link writeDataSync}.
  
  @function discernFileFormatter
  @param {String} filePath Input file path
  @returns {Function} A formatter function that will write the extension format
  
  @example
  var formatter = io.discernFileFormatter('path/to/data.tsv')
  var csv = formatter(json)