export type TreeSignalOutcome = "sent" | "gone" | "failed";
/** POSIX detaches into its own group; Windows needs an explicit tree kill. */
export declare function supportsProcessGroups(): boolean;
export declare function processAlive(pid: number | undefined): boolean;
export declare function processGroupAlive(processGroupId: number | undefined): boolean;
/**
 * Terminate a process and its descendants. POSIX signals the process group when
 * one is known; Windows uses `taskkill /T` because signalling the shell pid
 * leaves the real workload (servers, scanners) holding ports and CPU.
 */
export declare function terminateProcessTree(pid: number, options: {
    signal: NodeJS.Signals;
    processGroupId?: number | undefined;
}): TreeSignalOutcome;
/** Best-effort synchronous-looking descendant check used by tests/diagnostics. */
export declare function hasLiveDescendants(pid: number): Promise<boolean>;