better-auth/docs/app/sitemap.ts

import type { MetadataRoute } from "next";
import { blogs, source } from "@/lib/source";

const BASE_URL = "https://better-auth.com";

export default async function sitemap(): Promise<MetadataRoute.Sitemap> {
	const basePages: MetadataRoute.Sitemap = [
		{
			url: BASE_URL,
			lastModified: new Date(),
			changeFrequency: "daily",
			priority: 1.0,
		},
		{
			url: `${BASE_URL}/blog`,
			lastModified: new Date(),
			changeFrequency: "weekly",
			priority: 0.8,
		},
		{
			url: `${BASE_URL}/changelog`,
			lastModified: new Date(),
			changeFrequency: "weekly",
			priority: 0.8,
		},
		{
			url: `${BASE_URL}/community`,
			lastModified: new Date(),
			changeFrequency: "weekly",
			priority: 0.8,
		},
		{
			url: `${BASE_URL}/enterprise`,
			lastModified: new Date(),
			changeFrequency: "weekly",
			priority: 0.8,
		},
		{
			url: `${BASE_URL}/products/framework`,
			lastModified: new Date(),
			changeFrequency: "weekly",
			priority: 0.8,
		},
		{
			url: `${BASE_URL}/products/infrastructure`,
			lastModified: new Date(),
			changeFrequency: "weekly",
			priority: 0.8,
		},
	];

	const docPages: MetadataRoute.Sitemap = await Promise.all(
		source.getPages().map(async (page) => {
			const { lastModified } = await page.data.load();
			return {
				url: `${BASE_URL}${page.url}`,
				lastModified: lastModified ? new Date(lastModified) : new Date(),
				changeFrequency: "weekly",
				priority: 0.7,
			};
		}),
	);

	const blogPages: MetadataRoute.Sitemap = blogs.getPages().map((page) => ({
		url: `${BASE_URL}${page.url.replace("/blogs/", "/blog/")}`,
		lastModified: page.data.date ? new Date(page.data.date) : new Date(),
		changeFrequency: "monthly",
		priority: 0.6,
	}));

	return [...basePages, ...docPages, ...blogPages];
}