Function generateBlogFeed

packages/docusaurus-plugin-content-blog/src/feed.ts:35–93

({
  blogPosts,
  options,
  siteConfig,
  outDir,
  locale,
}: {
  blogPosts: BlogPost[];
  options: PluginOptions;
  siteConfig: DocusaurusConfig;
  outDir: string;
  locale: string;
})

} from '@docusaurus/plugin-content-blog';

async function generateBlogFeed({
  blogPosts,
  options,
  siteConfig,
  outDir,
  locale,
}: {
  blogPosts: BlogPost[];
  options: PluginOptions;
  siteConfig: DocusaurusConfig;
  outDir: string;
  locale: string;
}): Promise<Feed | null> {
  if (!blogPosts.length) {
    return null;
  }

  const {feedOptions, routeBasePath} = options;
  const {url: siteUrl, baseUrl, title, favicon, trailingSlash} = siteConfig;
  const blogBaseUrl = applyTrailingSlash(
    normalizeUrl([siteUrl, baseUrl, routeBasePath]),
    {
      trailingSlash,
      baseUrl,
    },
  );

  const blogPostsForFeed =
    feedOptions.limit === false || feedOptions.limit === null
      ? blogPosts
      : blogPosts.slice(0, feedOptions.limit);

  const updated = blogPostsForFeed[0]?.metadata.date;

  const feed = new Feed({
    id: blogBaseUrl,
    title: feedOptions.title ?? `${title} Blog`,
    updated,
    language: feedOptions.language ?? locale,
    link: blogBaseUrl,
    description: feedOptions.description ?? `${siteConfig.title} Blog`,
    favicon: favicon ? normalizeUrl([siteUrl, baseUrl, favicon]) : undefined,
    copyright: feedOptions.copyright,
  });

  const createFeedItems =
    options.feedOptions.createFeedItems ?? defaultCreateFeedItems;

  const feedItems = await createFeedItems({
    blogPosts: blogPostsForFeed,
    siteConfig,
    outDir,
    defaultCreateFeedItems,
  });

  feedItems.forEach(feed.addItem);

  return feed;