Dynamiczny sitemap.xml w Next.js (app/sitemap.ts)

import type { MetadataRoute } from 'next'
import { caseSlugOrder } from '@/data/cases'
import { SITE_STATIC_PATHS } from '@/data/site-static-paths'
import { getAllPosts, getPostModifiedDate } from '@/lib/blog'
import { getAllLibraryEntries, getLibraryModifiedDate } from '@/lib/library'
import { getStaticPagesLastModified } from '@/lib/site-static-lastmod'
import { getSiteUrl } from '@/lib/site'

export default async function sitemap(): Promise<MetadataRoute.Sitemap> {
  const site = getSiteUrl()
  const base = site.replace(/\/$/, '')
  const staticLastMod = getStaticPagesLastModified()
  const posts = await getAllPosts()
  const library = await getAllLibraryEntries()

  const entries: MetadataRoute.Sitemap = [
    ...SITE_STATIC_PATHS.map((path) => ({
      url: `${base}${path}`,
      lastModified: staticLastMod,
      changeFrequency: 'weekly' as const,
      priority: path === '/' ? 1 : 0.7,
    })),
    ...caseSlugOrder.map((slug) => ({
      url: `${base}/kejsy/${slug}/`,
      lastModified: staticLastMod,
      changeFrequency: 'monthly' as const,
      priority: 0.65,
    })),
    ...posts.map((p) => ({
      url: `${base}/blog/${p.slug}/`,
      lastModified: new Date(getPostModifiedDate(p)),
      changeFrequency: 'monthly' as const,
      priority: 0.6,
    })),
    ...library.map((e) => ({
      url: `${base}/biblioteka/${e.slug}/`,
      lastModified: new Date(getLibraryModifiedDate(e)),
      changeFrequency: 'monthly' as const,
      priority: 0.62,
    })),
  ]
  return entries
}