import { Observable } from 'rxjs';
import { OTPVerifyResult, TOTPGenerateOptions, TOTPVerifyOptions } from '../schemas/interfaces';
export declare class TOTP {
    static generate: (key: string, options?: TOTPGenerateOptions) => Observable<string>;
    static verify: (token: string, key: string, options?: TOTPVerifyOptions) => Observable<OTPVerifyResult | {}>;
}