import type { Request } from "express";
/**
 * Extracts client IP address, handling proxy scenarios
 * @param req Express Request object
 * @returns Client IP address or null if unable to determine
 */
export declare function extractClientIP(req: Request): string | null;
/**
 * Validates if an IP address is valid IPv4 or IPv6
 */
export declare function isValidIP(ip: string): boolean;
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