const getUniqueTags = function()

in gulpfile.js [124:136]


const getUniqueTags = function (datasets) {
  // Build up list of unique tags
  let tags = [];
  datasets.forEach((d) => {
    d.Tags.forEach((t) => {
      if (tags.includes(t) === false) {
        tags.push(t);
      }
    });
  });

  return tags;
};