How to use the hexo-util.Color function in hexo-util

options = options || {};

  const min = options.min_font || 10;
  const max = options.max_font || 20;
  const orderby = options.orderby || 'name';
  const order = options.order || 1;
  const unit = options.unit || 'px';
  let color = options.color;
  const { transform } = options;
  const separator = options.separator || ' ';
  const result = [];
  let startColor, endColor;

  if (color) {
    startColor = new Color(options.start_color);
    endColor = new Color(options.end_color);

    if (!startColor || !endColor) color = false;
  }

  // Sort the tags
  if (orderby === 'random' || orderby === 'rand') {
    tags = tags.random();
  } else {
    tags = tags.sort(orderby, order);
  }

  // Limit the number of tags
  if (options.amount) {
    tags = tags.limit(options.amount);
  }

if (!tags || !tags.length) return '';
  options = options || {};

  const min = options.min_font || 10;
  const max = options.max_font || 20;
  const orderby = options.orderby || 'name';
  const order = options.order || 1;
  const unit = options.unit || 'px';
  let color = options.color;
  const { transform } = options;
  const separator = options.separator || ' ';
  const result = [];
  let startColor, endColor;

  if (color) {
    startColor = new Color(options.start_color);
    endColor = new Color(options.end_color);

    if (!startColor || !endColor) color = false;
  }

  // Sort the tags
  if (orderby === 'random' || orderby === 'rand') {
    tags = tags.random();
  } else {
    tags = tags.sort(orderby, order);
  }

  // Limit the number of tags
  if (options.amount) {
    tags = tags.limit(options.amount);
  }