import { BaseCaptchaProvider } from "./base-captcha.provider";
import { CaptchaRenderOptions, widgetId } from "../types";
import * as i0 from "@angular/core";
declare global {
    interface Window {
        turnstile: any;
    }
}
export declare class TurnstileProvider extends BaseCaptchaProvider {
    private readonly logger;
    private backdropElement;
    readonly name = "turnstile";
    readonly url = "https://challenges.cloudflare.com/turnstile/v0/api.js?compat=recaptcha";
    render(element: HTMLElement, options: CaptchaRenderOptions): number | string;
    execute(widgetId?: widgetId): void;
    reset(widgetId?: widgetId): void;
    getResponse(widgetId?: widgetId): string | null;
    private configureInvisibleCaptcha;
    private showBackdrop;
    private removeExistingBackdrop;
    private createBackdrop;
    private positionCaptchaContainer;
    private ensureCaptchaWidget;
    static ɵfac: i0.ɵɵFactoryDeclaration<TurnstileProvider, never>;
    static ɵprov: i0.ɵɵInjectableDeclaration<TurnstileProvider>;
}