import { NgZone } from '@angular/core';
export declare class ScriptService {
    protected zone: NgZone;
    /**
     * Name of the global google recaptcha script
     */
    protected readonly windowGrecaptcha = "grecaptcha";
    /**
    * Name of the global callback
    */
    protected readonly windowOnLoadCallbackProperty = "ngx_captcha_onload_callback";
    protected readonly globalDomain: string;
    protected readonly defaultDomain: string;
    constructor(zone: NgZone);
    registerCaptchaScript(useGlobalDomain: boolean, render: string, onLoad: (grecaptcha: any) => void, language?: string): void;
    cleanup(): void;
    /**
     * Indicates if google recaptcha script is available and ready to be used
     */
    private grecaptchaScriptLoaded;
    /**
     * Gets language param used in script url
     */
    private getLanguageParam;
    /**
    * Url to google api script
    */
    private getCaptchaScriptUrl;
}