import * as Canvas from "canvas";
declare class Captcha {
    private _canvas;
    private _value;
    constructor(_h?: number, _text?: string, _complexity?: {
        lines?: number;
        circleRadius?: number;
        foregroundNoise?: number;
    });
    get value(): string;
    get PNGStream(): Canvas.PNGStream;
    get JPEGStream(): Canvas.JPEGStream;
    get dataURL(): string;
}
export { Captcha };
export default Captcha;
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