sitemap.ts

import type { MetadataRoute } from 'next';
import { source } from "./source";

export const revalidate = false;

const baseUrl =
  process.env.NODE_ENV === 'development' || !process.env.VERCEL_URL
    ? new URL('http://localhost:3000')
    : new URL(`https://${process.env.VERCEL_URL}`);

export default function sitemap(): MetadataRoute.Sitemap {
  const url = (path: string): string => new URL(path, baseUrl).toString();

  return [
    {
      url: url('/'),
      changeFrequency: 'monthly',
      priority: 1,
    },
    ...source.getPages().map<MetadataRoute.Sitemap[number]>((page) => ({
      url: url(page.url),
      lastModified: page.data.lastModified
        ? new Date(page.data.lastModified)
        : undefined,
      changeFrequency: 'weekly',
      priority: 0.5,
    })),
  ];
}