code: function longFormat(ms) {
    return plural(ms, d, 'day') ||
      plural(ms, h, 'hour') ||
      plural(ms, m, 'minute') ||
      plural(ms, s, 'second') ||
      ms + ' ms';
  }
docs: Long format for `ms`.
  
  @api private
  @param {number} ms
  @return {string}