import { BaseCaptcha } from '../base/BaseCaptcha';
import { InvisibleCaptchaOptions } from '../types';
export declare class InvisibleCaptcha extends BaseCaptcha {
    private mouseMovements;
    private keyboardEvents;
    private score;
    private isVerifying;
    constructor(options: InvisibleCaptchaOptions);
    protected init(): void;
    drawCaptcha(): void;
    verify(input?: string | number): boolean;
    /**
     * 计算验证分数
     */
    private calculateScore;
    /**
     * 自动验证
     */
    private autoVerify;
}