/**
 * @typedef {{ value: string[] | string, type: string | null }} IpResult
 */
/**
 * Retrieves the client's IP address from the Express request object,
 * supporting detection for Firebase/Cloud Functions, proxies, and direct connections.
 *
 * @param {import('express').Request} req - The Express request object.
 * @param {Object} [options] - Optional configuration.
 * @param {boolean} [options.isFirebase=false] - Enable detection for Firebase environments (e.g., Fastly).
 *
 * @returns {IpResult} An object containing the list of IP addresses and the detection source type.
 *
 * @example
 * const ipInfo = userIp(req);
 * console.log(ipInfo.value); // ['192.168.0.1']
 * console.log(ipInfo.type);  // 'x-forwarded-for'
 */
export default function userIp(req: import("express").Request, options?: {
    isFirebase?: boolean | undefined;
}): IpResult;
export type IpResult = {
    value: string[] | string;
    type: string | null;
};
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