import { LazyLoaderServiceInterface } from '@internetarchive/lazy-loader-service';
import { RecaptchaWidgetInterface } from './recaptcha-widget';
export interface RecaptchaManagerInterface {
    /**
     * Changes the manager's timeout delay to the given number of milliseconds.
     */
    setTimeoutDelay(delay: number): void;
    /**
     * Load a recaptcha widget for a given site key or the default site key.
     */
    getRecaptchaWidget(options?: {
        siteKey?: string;
        recaptchaParams?: ReCaptchaV2.Parameters;
    }): Promise<RecaptchaWidgetInterface>;
}
export declare class RecaptchaManager implements RecaptchaManagerInterface {
    private static readonly DEFAULT_TIMEOUT;
    private lazyLoader;
    private defaultSiteKey?;
    private recaptchaCache;
    /**
     * How long in milliseconds to wait for the recaptcha library to load before timing out.
     */
    private timeout;
    constructor(options?: {
        defaultSiteKey?: string;
        lazyLoader?: LazyLoaderServiceInterface;
        grecaptchaLibrary?: ReCaptchaV2.ReCaptcha;
        timeout?: number;
    });
    /** @inheritdoc */
    setTimeoutDelay(delay: number): void;
    /** @inheritdoc */
    getRecaptchaWidget(options?: {
        siteKey?: string;
        recaptchaParams?: ReCaptchaV2.Parameters;
    }): Promise<RecaptchaWidgetInterface>;
    /**
     * Load the Recaptcha library from Google.
     *
     * @returns Promise<ReCaptchaV2.ReCaptcha>
     */
    private getRecaptchaLibrary;
    /** don't use directly, use `getRecaptchaLibrary()` */
    private grecaptchaLibraryCache?;
}