export interface GetRandomPortOptions {
    maxRetries?: number;
    timeout?: number;
}
/**
 * Get a random available TCP port.
 *
 * Note that this function is prone to race conditions: a different process can start using the
 * returned port before the caller of this function can start their server. However, in-process
 * race conditions are prevented by storing the returned ports, so that a quick succession of
 * calls to this function never returns a duplicate port.
 */
export declare function getRandomPort(options?: GetRandomPortOptions): Promise<number>;
export declare function getHostIp(): Promise<string>;
export declare function downloadFile(url: string, dest: string): Promise<void>;