/**
 * Detect the user's preferred language.
 *
 * Checks (in order): localStorage → browser language list → default.
 */
export declare function detectLanguage(isLanguageSupported: (lang: string) => boolean, defaultLanguage: string, storageKey: string): string;
/**
 * Strip a language prefix from a pathname.
 *
 * `/en/daily` → `/daily`, `/zh-hant` → `/`
 */
export declare function stripLangPrefix(pathname: string): string;
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