/**
 * DTO for setting a user's preferred MFA device.
 *
 * This updates which device is used by default during MFA challenges.
 * The preferred device is marked with `isPrimary` in the database (internal field).
 * API responses expose this as `isPreferred` (outward-facing field).
 *
 * @example
 * ```typescript
 * const dto: SetPreferredDeviceDTO = { deviceId: 123 };
 * await mfaService.setPreferredDevice(dto);
 * ```
 */
export declare class SetPreferredDeviceDTO {
    /**
     * MFA device ID to set as preferred
     *
     * Validation:
     * - Must be a positive integer
     *
     * Sanitization:
     * - Strings are converted to numbers (useful for path params)
     *
     * @example 123
     */
    deviceId: number;
}
/**
 * Response DTO for setting preferred MFA device.
 *
 * @example
 * ```typescript
 * {
 *   message: "Preferred MFA device updated"
 * }
 * ```
 */
export declare class SetPreferredDeviceResponseDTO {
    /**
     * Success message
     *
     * @example "Preferred MFA device updated"
     */
    message: string;
}
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