import { type TFunction } from 'i18next';
/**
 * Initialize i18next with zh/en resources.
 * Call once at app startup. Returns t() and changeLanguage().
 */
export declare function createI18n(lang: string): {
    t: TFunction;
    changeLanguage: (l: string) => void;
};
/**
 * Global t() function. Must call createI18n() before use.
 */
export declare function t(key: string, options?: Record<string, unknown>): string;
/**
 * Detect language from env variable like LANG, LC_ALL, etc.
 * - "zh_CN.UTF-8" -> "zh"
 * - "en_US.UTF-8" -> "en"
 * Falls back to "en".
 */
export declare function detectLang(envLang?: string): string;
//# sourceMappingURL=i18n.d.ts.map