Function _getPageMetadata

apps/site/next.dynamic.mjs:200–261

(locale = defaultLocale.code, path = '')

   * @returns {Promise<import('next').Metadata>}
   */
  const _getPageMetadata = async (locale = defaultLocale.code, path = '') => {
    const pageMetadata = { ...PAGE_METADATA };

    const { source = '' } = await getMarkdownFile(locale, path);

    const { data } = matter(source);

    const getUrlForPathname = (l, p) =>
      `${baseUrlAndPath}/${l}${p ? `/${p}` : ''}`;

    // Default Title for the page
    pageMetadata.title = data.title
      ? `${siteConfig.title} — ${data.title}`
      : siteConfig.title;

    pageMetadata.description = data.description
      ? data.description
      : siteConfig.description;

    // Default Twitter Title for the page
    pageMetadata.twitter.title = pageMetadata.title;

    // Default Open Graph Image for the page
    pageMetadata.openGraph.images = [
      ENABLE_STATIC_EXPORT
        ? `${defaultLocale.code}/next-data/og/announcement/Run JavaScript Everywhere`
        : `${defaultLocale.code}/next-data/og/${data.category ?? DEFAULT_CATEGORY_OG_TYPE}/${pageMetadata.title}`,
    ];

    // Default canonical URL for the page
    pageMetadata.alternates.canonical =
      data.canonical ?? getUrlForPathname(locale, path);

    // Default alternate URL for the page in the default locale
    pageMetadata.alternates.languages['x-default'] = getUrlForPathname(
      defaultLocale.code,
      path
    );

    // Retrieves a matching blog feed for the category of the blog post
    // If no matching blog feed is found, we simply fallback to the default blog feed
    const matchingBlogFeed = siteConfig.rssFeeds.find(
      feed => feed.category === data.category
    );

    // Adds the RSS Feed URL to the page metadata, if a matching feed is found
    // otherwise, we fallback to the default blog feed
    pageMetadata.alternates.types['application/rss+xml'] = getUrlForPathname(
      locale,
      `feed/${matchingBlogFeed?.file ?? 'blog.xml'}`
    );

    // Iterate all languages to generate alternate URLs for each language
    availableLocaleCodes.forEach(currentLocale => {
      pageMetadata.alternates.languages[currentLocale] = getUrlForPathname(
        currentLocale,
        path
      );