import { BaseCaptchaOptions, CaptchaInstance } from '../types';
export declare abstract class BaseCaptcha implements CaptchaInstance {
    protected container: HTMLElement;
    protected options: BaseCaptchaOptions;
    protected token: string | null;
    protected isVerified: boolean;
    constructor(options: BaseCaptchaOptions);
    protected abstract init(): void;
    abstract drawCaptcha(): void;
    abstract verify(input?: string | number): boolean;
    refresh(): void;
    getToken(): string | null;
    destroy(): void;
    /**
     * 生成随机令牌
     */
    protected generateToken(): string;
    /**
     * 触发成功事件
     */
    protected triggerSuccess(): void;
    /**
     * 触发失败事件
     */
    protected triggerFail(): void;
}