import { VanillaHCaptchaJsApiConfig } from "./hcaptcha";
declare global {
    interface Window {
        _hCaptchaOnLoad?: Function;
        _hCaptchaOnLoadPromise?: Promise<void>;
    }
}
/**
 * Loads the hCaptcha JS API only once on the page despite multiple attempts.
 *
 * Usage:
 * 1. import hcaptchaScript from './hcaptcha-script';
 * 2. when web component is mounted do:
 *      loadJsApiIfNotAlready(HCaptchaConfig)
 *        .then(() => console.log('hcaptcha is loaded, so it is safe to be used'))
 *        .catch((err) => console.error('failed to load the hcaptcha', err));
 */
export declare function loadJsApiIfNotAlready(config: VanillaHCaptchaJsApiConfig): Promise<void>;