export declare function validateAndResolve(host: string, port: number, resolver?: (host: string) => Promise<{
    address: string;
}[]>): Promise<{
    ok: true;
    address: string;
} | {
    ok: false;
}>;
export declare function splitHostPort(hostport: string): [string, string];
export declare function startEgressProxy(): Promise<{
    port: number;
}>;
export declare function launchAuditChromium(): Promise<import("playwright").Browser>;