/**
 * Normalizes a locale string to its BCP 47 canonical form.
 *
 * Underscore-separated locale tags are accepted for compatibility with common
 * platform and user-input conventions. Invalid tags return null.
 */
declare const normalizeLocale: (rawLocale: string) => string | null;
declare function canonicalLocaleOrRaw(rawLocale: string): string;

export { canonicalLocaleOrRaw, normalizeLocale };