type LanguageMode = 'system' | 'fixed';
type Messages = Record<string, string>;
type LanguagePack = {
    tag: string;
    messages: Messages;
    aliases?: string[];
    rtl?: boolean;
};
type I18nState = {
    tag: string | null;
    mode: LanguageMode;
    rtl: boolean;
};
declare class I18nServiceImpl {
    private initialized;
    private mode;
    private currentTag;
    private isRTL;
    private packs;
    private aliasMap;
    private overrides;
    private listeners;
    private unsubscribeLoc?;
    initialize(): Promise<void>;
    destroy(): void;
    registerPacks(packs: LanguagePack[]): void;
    getState(): I18nState;
    addListener(listener: (state: I18nState) => void): () => void;
    setLanguageMode(mode: LanguageMode): void;
    setLanguageTag(tag: string | null): void;
    private sanitizeMessages;
    updateOverrides(next: Record<string, string | null | undefined>): void;
    resetOverrides(): void;
    t(key: string, params?: Record<string, any>): string;
    private selectBestTag;
    private resolveMessage;
    private lookupInTag;
    private fallbackChain;
    private computeRTL;
    private resolveTag;
    private normalizeTag;
    private interpolate;
    private parseJson;
    private emit;
}
export declare const I18nService: I18nServiceImpl;
export default I18nService;
//# sourceMappingURL=I18nService.d.ts.map