src/hooks.server.ts

import type { Handle } from '@sveltejs/kit';
import { addYears } from 'date-fns';

export const handle: Handle = async ({ event, resolve }) => {
	const token = event.cookies.get('session');

	event.locals.sessionId = token || crypto.randomUUID();

	// Refresh cookie expiration date
	event.cookies.set('session', event.locals.sessionId, {
		path: '/',
		sameSite: 'lax',
		secure: true,
		httpOnly: true,
		expires: addYears(new Date(), 1)
	});

	const response = await resolve(event);

	return response;
};