import { TranslateService as NGxTranslateService } from '@ngx-translate/core';
import { Observable } from 'rxjs/Observable';
export declare class TranslateService {
    private translate;
    constructor(translate: NGxTranslateService);
    readonly currentLang: string;
    /**
     * Gets the translated value of a key (or an array of keys)
     * @param key
     * @param interpolateParams
     * @returns {any} the translated key, or an object of translated keys
     */
    get(key: string | Array<string>, interpolateParams?: Object): Observable<string | any>;
    /**
     * Returns a stream of translated values of a key (or an array of keys) which updates
     * whenever the language changes.
     * @param key
     * @param interpolateParams
     * @returns {any} A stream of the translated key, or an object of translated keys
     */
    stream(key: string | Array<string>, interpolateParams?: Object): Observable<string | any>;
    /**
     * Returns a translation instantly from the internal state of loaded translation.
     * All rules regarding the current language, the preferred language of even fallback languages will be used except any promise handling.
     * @param key
     * @param interpolateParams
     * @returns {string}
     */
    instant(key: string | Array<string>, interpolateParams?: Object): string | any;
    /**
     * Changes the lang currently used
     * @param lang
     * @returns {Observable<*>}
     */
    use(lang: string): Observable<any>;
    /**
     * Sets the default language to use as a fallback
     * @param lang
     */
    setDefaultLang(lang: string): void;
    /**
     * Gets the default language used
     * @returns string
     */
    getDefaultLang(): string;
    /**
     * Returns an array of currently available langs
     * @returns {any}
     */
    getLangs(): Array<string>;
    /**
     * @param langs
     * Add available langs
     */
    addLangs(langs: Array<string>): void;
    /**
     * Sets the translated value of a key
     * @param key
     * @param value
     * @param lang
     */
    set(key: string, value: string, lang?: string): void;
    /**
     * Allows to reload the lang file from the file
     * @param lang
     * @returns {Observable<any>}
     */
    reloadLang(lang: string): Observable<any>;
    /**
     * Deletes inner translation
     * @param lang
     */
    resetLang(lang: string): void;
    /**
     * Returns the language code name from the browser, e.g. "de"
     *
     * @returns string
     */
    getBrowserLang(): string;
    /**
     * Returns the culture language code name from the browser, e.g. "de-DE"
     *
     * @returns string
     */
    getBrowserCultureLang(): string;
}