import { CaptchaComponent } from '../components/captcha/captcha.component';
import { Observable } from 'rxjs';
import * as i0 from "@angular/core";
export declare class CaptchaService {
    private readonly logger;
    private component;
    private lastPromise;
    private lastTimeout;
    registerComponent(component: CaptchaComponent): void;
    private runTest;
    private showCaptcha;
    unregisterComponent(component: CaptchaComponent): void;
    notifyResolved(code: string): void;
    executeAsync(onManual: () => void): Promise<string>;
    execute(): Observable<string>;
    private clearLastRequest;
    static ɵfac: i0.ɵɵFactoryDeclaration<CaptchaService, never>;
    static ɵprov: i0.ɵɵInjectableDeclaration<CaptchaService>;
}