export declare function issueCaptcha(): {
    id: string;
    svg: string;
    expiresAt: number;
};
export declare function consumeCaptcha(id: string, answer: string): boolean;
export declare function _resetCaptchaForTests(): void;
export declare function _issueCaptchaForTests(answer: string): {
    id: string;
    svg: string;
};
/** Test-only: peek the stored answer hash for a challenge. */
export declare function _challengeCountForTests(): number;
//# sourceMappingURL=captcha.d.ts.map