import type { BrowserDnsLookup } from './security.js';
interface BrowserNetworkGuardProxyOptions {
    allowPrivateHosts?: boolean | undefined;
    allowedPrivateOrigins?: readonly string[] | undefined;
    lookup?: BrowserDnsLookup | undefined;
    connectTimeoutMs?: number | undefined;
}
/** Local HTTP proxy that pins every browser socket to its validated DNS answer. */
export declare class BrowserNetworkGuardProxy {
    private readonly options;
    private readonly server;
    private readonly sockets;
    private startPromise?;
    private url?;
    constructor(options?: BrowserNetworkGuardProxyOptions);
    start(): Promise<string>;
    close(): Promise<void>;
    private forwardHttp;
    private forwardConnect;
    private forwardUpgrade;
    private resolve;
}
export {};
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