Next.js: ISR (Incremental Static Regeneration) — пример кода

// app/blog/[slug]/page.tsx
// Pre-render the top posts at build; render the long tail on first hit.
export const revalidate = 3600;        // regenerate at most once per hour
export const dynamicParams = true;      // allow slugs not in generateStaticParams

export async function generateStaticParams() {
  const posts = await getTopPosts();    // only the hot paths at build time
  return posts.map((p) => ({ slug: p.slug }));
}

export default async function Post({ params }: { params: { slug: string } }) {
  const post = await getPost(params.slug); // cached in the Data Cache too
  return {post.body};
}

// The correctness upgrade: on-demand invalidation from your mutation.
'use server';
import { revalidateTag, revalidatePath } from 'next/cache';

export async function publishPost(slug: string) {
  await db.publish(slug);
  revalidatePath(`/blog/${slug}`);   // this page is fresh NOW, not in an hour
  revalidateTag('post-list');         // and any list that tagged its fetch
}