declare abstract class CIDR {
    abstract type: "v4" | "v6";
    abstract partSize: 8 | 16;
    abstract parts: readonly number[];
    abstract bits: number;
    contains(ip: number[]): boolean;
}
export declare function parseProxy(proxy: string): string | CIDR;
interface PartialSocket {
    remoteAddress?: string;
}
interface PartialInfo {
    remoteAddress?: string;
}
interface PartialIdentiy {
    sourceIp?: string;
}
interface PartialRequestContext {
    identity?: PartialIdentiy;
}
export type HeaderLike = {
    headers: Headers;
} | {
    headers: Record<string, string | string[] | undefined>;
};
export type RequestLike = {
    ip?: unknown;
    socket?: PartialSocket;
    info?: PartialInfo;
    requestContext?: PartialRequestContext;
} & HeaderLike;
export type Platform = "cloudflare" | "fly-io" | "vercel" | "render";
export interface Options {
    platform?: Platform;
    proxies?: Array<string | CIDR>;
}
declare function findIP(request: RequestLike, options?: Options): string;
export default findIP;