/**
 * Pure, fs-free RSS 2.0 feed builder for the blog - the feed counterpart of `buildSitemap`.
 * No `next` or `react` import: the feed is returned as a complete XML string for the consumer
 * to serve from a route handler (`new Response(xml, { headers: { "Content-Type":
 * "application/rss+xml; charset=utf-8" } })`), which also works in a Next static export
 * (`export const dynamic = "force-static"`).
 *
 * One feed per locale, mounted by convention at `<locale index path>/rss.xml` (e.g.
 * `/blog/rss.xml`, or `/en/rss.xml` under `prefixDefaultLocale`) - the same `localePath` the
 * links, canonicals and sitemap use, so the feed's URLs can never drift from the rendered site. On
 * a domain-per-locale site (`site.localeOrigins`) each feed and its URLs sit on its locale's origin.
 */
import type { PostMeta, SiteConfig } from "./types.js";
/**
 * The root-relative path a locale's feed is mounted at by convention:
 * `<locale index path>/rss.xml` (e.g. `/blog/rss.xml`, `/en/rss.xml`).
 *
 * @param site - the site configuration.
 * @param lang - the locale code.
 * @returns the root-relative feed path.
 */
export declare function rssFeedPath(site: SiteConfig, lang: string): string;
/**
 * Builds one locale's complete RSS 2.0 document from its posts' metadata.
 *
 * The channel is the locale's blog index (title from `site.indexName` falling back to `brandName`,
 * description from `site.description` with the same fallback the overview metadata uses - both
 * resolved for THIS locale, so a Dutch feed does not announce itself in English); each item carries the
 * post's absolute URL as both `link` and permalink `guid`, its description, its categories, and
 * a `pubDate` when the post declares a date. The channel's `lastBuildDate` is the newest post
 * date, so an unchanged blog produces a byte-identical feed - readers and crawlers see a new
 * build only when a post actually changed.
 *
 * @param posts - the locale's posts' metadata (typically `Blog.getAllPosts(lang)`), newest first.
 * @param site - the site configuration; `siteUrl` (or the locale's `localeOrigins` entry) makes
 *   every URL absolute.
 * @param lang - the locale code the feed is for. Defaults to the site's default locale.
 * @returns the XML document, ready to serve as `application/rss+xml`.
 */
export declare function buildRssFeed(posts: PostMeta[], site: SiteConfig, lang?: string): string;