/**
 * Check if a port is in use by attempting to bind to it. Binding is local and
 * resolves immediately, so unlike a connection-based check it never stalls on
 * the OS TCP connect timeout when `localhost` resolves to an unreachable address
 * (e.g. IPv6 `::1`) -- the cause of the `nx serve` hang in #33909.
 */
export declare function isPortInUse(port: number, host?: string): Promise<boolean>;