import type { HttpsProxyAgent } from 'https-proxy-agent';
import { UnexpectedError } from 'n8n-workflow';
import type http from 'node:http';
import type net from 'node:net';
import type { SsrfBridge } from '../ssrf';
type ProxyConnectOpts = Parameters<HttpsProxyAgent<string>['connect']>[1];
export declare class UnknownConnectionHostError extends UnexpectedError {
    constructor();
}
type ConnectionOptions = {
    host?: string | null;
    hostname?: string | null;
};
type CreateConnection = (options: ConnectionOptions, onConnect?: (error: Error | null, stream?: unknown) => void) => unknown;
interface ProxyConnectionAgent {
    connectOpts: ConnectionOptions;
    connect(req: http.ClientRequest, opts: ProxyConnectOpts): Promise<net.Socket>;
}
export declare function installProxyConnectionGuard(agent: ProxyConnectionAgent, ssrf: SsrfBridge): void;
export declare function installConnectionGuard(target: {
    createConnection: CreateConnection;
}, ssrf: SsrfBridge): void;
export {};