import { HttpRequest } from '@angular/common/http';
import * as i0 from "@angular/core";
export declare class JwtHelperService {
    urlBase64Decode(str: string): string;
    private b64decode;
    private b64DecodeUnicode;
    decodeToken<T = any>(token: string): null | T;
    getTokenExpirationDate(token: string): Date | null;
    isTokenExpired(token: string | null, offsetSeconds?: number): boolean;
    getAuthScheme(authScheme: Function | string | undefined, request: HttpRequest<any>): string | undefined;
    static ɵfac: i0.ɵɵFactoryDeclaration<JwtHelperService, never>;
    static ɵprov: i0.ɵɵInjectableDeclaration<JwtHelperService>;
}