code: function breakpointToString(options) {
    var mq;
  
    if ('undefined' !== typeof options.mq) {
      mq = options.mq;
    } else {
      var max = Util.getOption(options.max, Infinity);
      var min = Util.getOption(options.min, 0);
  
      mq = 'only screen';
      if (max < Infinity) {
        mq += ' and (max-width: ' + max + 'px)';
      }
      if (min > 0) {
        mq += ' and (min-width: ' + min + 'px)';
      }
    }
  
    return mq;
  }
docs: Convert a map with max/min values into a media query string.
  @param {Object} options The options.
  @param {number=} options.min The minimum size.
  @param {number=} options.max The maximum size.
  @return {string} The resulting media query.