import { EventEmitter } from "@angular/core";
import { TranslateService } from "@ngx-translate/core";
export declare class TranslateHelper {
    static alert: {
        en: {};
        zh: {};
    };
    static time: {};
    static languageChangEvent: EventEmitter<{
        oldLang: string;
        curLang: string;
    }>;
    static changeLanguage(translateService: TranslateService, lang: string): void;
}