import type { Fallback } from '../types';
/**
 * Derive the BCP-47 parent tags of a locale, from most-specific to most-generic.
 *
 * `pt-BR-Latn` → `['pt-BR', 'pt']`
 * `pt-BR`      → `['pt']`
 * `pt`         → `[]`
 */
export declare function bcp47Parents(locale: string): string[];
/**
 * Resolve the ordered chain of locales to try for a single lookup.
 *
 * The returned array always starts with `locale` and ends with the default
 * locale, deduplicated. The middle is the explicit `fallback` if given,
 * otherwise the BCP-47 parent chain.
 */
export declare function resolveLocaleChain(locale: string, fallback: Fallback | undefined, defaultLocale: string): string[];