export declare type Trail = {
    x: number[];
    y: number[];
};
declare const verifyCaptcha: (captcha: number, { response, trail, }: {
    response: number;
    trail: Trail;
}, { tolerance, verify, }?: {
    tolerance?: number | undefined;
    verify?: ((captcha: number, solution: number, trail: Trail, tolerance: number) => boolean) | undefined;
}) => Promise<{
    result: 'success' | 'failure';
    token?: string;
}>;
export default verifyCaptcha;
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