Process an OPML file to generate an array of feeds

feedsformulti.js

// Read from an OPML file and write to a JSON file, processing the OPML file
// and producing the following for each of the feed items in the file:
//   name: title of the feed (from the title attribute)
//   url: URL of the feed (from the htmlUrl attribute)
//   feed: URL of the feed (from the xmlUrl attribute)
//   feedtype: type of feed (from the type attribute)
//
// NOTE: This only extracts feeds from the "CSS" and "Eleventy" outlines.
//       Remove that test if you wish to extract all of the feeds.
//
// Path: feedsformulti.js
import fs from "fs";
import xml2js from "xml2js";
import path from "path";

// Read the OPML file
const opml = fs.readFileSync("feeds.opml", "utf8");

function extractFeeds(outline) {
  let feeds = [];

  if (outline.$.text === "CSS" || outline.$.text === "Eleventy") {
    if (outline.outline) {
      for (let subOutline of outline.outline) {
        if (subOutline.$.type === "rss") {
          const attributes = subOutline.$;
          const feedtype =
            path.extname(attributes.xmlUrl) === ".json" ? "json" : "text";
          feeds.push({
            name: attributes.title,
            url: attributes.htmlUrl,
            feed: attributes.xmlUrl,
            feedType: feedtype,
          });
        }
      }
    }
  }

  if (outline.outline) {
    for (let subOutline of outline.outline) {
      feeds = feeds.concat(extractFeeds(subOutline));
    }
  }

  return feeds;
}

// Parse the OPML file
xml2js.parseString(opml, (err, result) => {
  if (err) {
    console.error(err);
    return;
  }

  // Extract the feeds
  const feeds = [];
  for (let outline of result.opml.body[0].outline) {
    feeds.push(...extractFeeds(outline));
  }

  // Write the feeds to a JSON file
  fs.writeFileSync("multifeeds-full.json", JSON.stringify(feeds, null, 2));
});

I am aware of this fact, I discovered a new package from this gist, xml2js, that's what I am focusing on.