import type { I18nConfig, LocalizedSlugs } from '../i18n/index.js';
type BuildHreflangArgs = {
    /** Absolute site origin, e.g. 'https://example.com'. Omit for relative paths. */
    baseUrl?: string;
    config: I18nConfig;
    /** Home slug that collapses to the locale root. Defaults to 'home'. */
    homeSlug?: string;
    /**
     * Localized segment the document lives under (an archive page's slugs),
     * e.g. { pl: 'artykuly', en: 'articles' }. Locales missing from the prefix
     * are omitted — an entry with no archive in that language has no URL there.
     */
    prefix?: LocalizedSlugs;
    /** slug per locale for the current document, e.g. { pl: 'o-nas', en: 'about' } */
    slugs: LocalizedSlugs;
};
/**
 * Next.js Metadata `alternates.languages`.
 *
 * Bridges SEO and i18n: for each configured locale that the document has a
 * slug in, it produces the locale-aware path (via buildLocalizedPath),
 * optionally prefixed with an absolute origin.
 *
 * Also emits `x-default` pointing at the default locale — the version Google
 * serves when the user's language/region matches no hreflang, and the fallback
 * when the root ('/') redirect is ambiguous (Googlebot with no/foreign
 * Accept-Language).
 *
 * @example
 * buildHreflangAlternates({
 *   slugs: { pl: 'o-nas', en: 'about' },
 *   config,
 *   baseUrl: 'https://example.com',
 * })
 * // → {
 * //   pl: 'https://example.com/pl/o-nas',
 * //   en: 'https://example.com/en/about',
 * //   'x-default': 'https://example.com/pl/o-nas',
 * // }
 */
export declare function buildHreflangAlternates({ baseUrl, config, homeSlug, prefix, slugs, }: BuildHreflangArgs): Record<string, string>;
export {};