code: function format(input, level, options) {
    if (util.isArray(input)) {
      return array(input, level, options);
    } else if (util.isObject(input)) {
      return object(input, level, options);
    } else {
      return stringify(input, options);
    }
  }
docs: Turns the `input` object into a string with options for human-friendly
  output.
  
  @param {Object} input
  @param {Object} [options]
  @returns {String}