/**
 * Supported UI/API locales.
 * Tier-1: zh-HK (香港書面語), zh-CN, en — quality bar.
 * Tier-2: world languages (+ ja, ko); full catalogs, key-parity with en.
 */
export type LocaleCode = 'zh-HK' | 'zh-CN' | 'en' | 'ja' | 'ko' | 'hi' | 'es' | 'ar' | 'fr' | 'bn' | 'pt' | 'id' | 'ur';
export declare const LOCALES: readonly LocaleCode[];
export declare const DEFAULT_LOCALE: LocaleCode;
/** Locales that require RTL document direction */
export declare const RTL_LOCALES: readonly LocaleCode[];
/** Display names (in that language where possible) */
export declare const LOCALE_LABELS: Record<LocaleCode, string>;
/**
 * Normalize Accept-Language / stored user locale to a supported code.
 * zh-TW and bare zh → zh-HK (香港書面語).
 */
export declare function normalizeLocale(input?: string | null): LocaleCode;
export declare function isRtlLocale(input?: string | null): boolean;
/** Parse Accept-Language header (first matching supported tag). */
export declare function localeFromAcceptLanguage(header?: string | null): LocaleCode;
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