import { T_LANG } from '../types/main';
import * as i0 from "@angular/core";
export declare class TranslateService {
    #private;
    private document;
    readonly lang$: import("rxjs").Observable<T_LANG | undefined>;
    static instance: TranslateService;
    constructor(document: Document);
    get lang(): T_LANG;
    set lang(value: T_LANG);
    translate(key: string, args?: Record<string, unknown>, locale?: T_LANG): string;
    static ɵfac: i0.ɵɵFactoryDeclaration<TranslateService, never>;
    static ɵprov: i0.ɵɵInjectableDeclaration<TranslateService>;
}