code: function bytes(value, options) {
    if (typeof value === 'string') {
      return parse(value);
    }
  
    if (typeof value === 'number') {
      return format(value, options);
    }
  
    return null;
  }
docs: Convert the given value in bytes into a string or parse to string to an integer in bytes.
  
  @param {string|number} value
  @param {{
  case: [string],
  decimalPlaces: [number]
  fixedDecimals: [boolean]
  thousandsSeparator: [string]
  unitSeparator: [string]
  }} [options] bytes options.
  
  @returns {string|number|null}