Webhooks in SvelteKit

// src/routes/api/cosmic/+server.ts
import { json } from '@sveltejs/kit';

export async function POST({ request }) {
  const secret = request.headers.get('x-webhook-secret');
  if (secret !== process.env.COSMIC_WEBHOOK_SECRET) {
    return json({ error: 'unauthorized' }, { status: 401 });
  }

  const payload = await request.json();
  if (payload.resource === 'objects' && payload.event === 'published') {
    // Rebuild or revalidate the page for payload.data.object.slug.
  }

  return json({ ok: true });
}