/**
 * Probe each port by attempting to bind a TCP server on `0.0.0.0`. Returns
 * all ports that are currently in use (listening with `EADDRINUSE` errors).
 *
 * This function checks multiple ports concurrently and filters to return only
 * those that are unavailable. Docker remains the ultimate decider for
 * ambiguous cases during actual compose up.
 */
export declare function findUnavailablePorts(ports: number[]): Promise<number[]>;