import { Observable } from 'rxjs';
import * as i0 from "@angular/core";
export declare class CaptchaService {
    private captcha;
    private invisibleCaptcha;
    constructor();
    getCaptcha(): string;
    setCaptcha(captcha: string): void;
    getInvisibelCaptcha(): string;
    setInvisibelCaptcha(captcha: string): void;
    generateCaptchaToken(action: string): Observable<string>;
    resetCaptcha(): void;
    static ɵfac: i0.ɵɵFactoryDeclaration<CaptchaService, never>;
    static ɵprov: i0.ɵɵInjectableDeclaration<CaptchaService>;
}
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