gatsby-node.js adding alternative creator from RSS feed

[lp-mkdir]

https://github.com/sofa-boys/gatsby-theme-podcast

I was trying to use the theme with a specific RSS which did not has the property "dc:creator" instead it's possible to take it from "itunes:author". I did edit the file like this in order to work:

const axios = require('axios');
const xml2js = require('xml2js');

module.exports = {
  sourceNodes: async (
    { actions, createNodeId, createContentDigest },
    options,
  ) => {
    const { createNode } = actions;

    const rssRes = await axios.get(options.rssUrl);
    const xmlParser = new xml2js.Parser();
    const rssJson = await xmlParser.parseStringPromise(rssRes.data);
    // check for author in dc:creator or itunes:author
    // due that not all RSS contain "dc:creator" and will generate an error
    const creator = rssJson.rss.channel[0].item.hasOwnProperty('dc:creator') ? 'dc:creator' : 'itunes:author'

    rssJson.rss.channel[0].item.forEach(item => {
      const nodeData = {
        creator: item[creator][0],
        pubDate: item.pubDate[0],
        num: item['itunes:episode'] ? parseInt(item['itunes:episode'][0]) : 0,
        title: item.title[0],
        descriptionHtml: item.description[0],
        enclosureUrl: item.enclosure[0].$.url,
        coverImgUrl: item['itunes:image'][0].$.href,
      };
    ...