/**
 * Shared low-level utilities (process kill/reap, id minting) used across the
 * supervisor stack — LongRunningSupervisor and the orphan sweep.
 *
 * Extracted so the kill/reap machinery is maintained in one place.
 */
import type { ChildProcess } from "../../utils/safe-spawn.js";
import type { Logger } from "../../utils/logger.js";
/**
 * Send SIGTERM to `child` (and its process group), then SIGKILL after the
 * grace period if still alive.  Safe to call on an already-dead child.
 *
 * Returns once the child (and any stragglers found in the pre-kill descendant
 * snapshot) are all gone.
 */
export declare function killChild(child: ChildProcess, reason: string, graceMs: number, logger: Logger): Promise<void>;
/**
 * SIGKILL any pids from a pre-kill descendant snapshot that are still alive.
 */
export declare function reapSurvivors(pids: number[], sig: "SIGKILL", logger: Logger): void;
/**
 * Signal the child's process group (negative pid) when detached, falling back
 * to the direct child.  Returns false if the process is already gone.
 */
export declare function signalChild(child: ChildProcess, sig: "SIGTERM" | "SIGKILL"): boolean;
/**
 * Collect every transitive descendant pid of `rootPid` by reading the full
 * process table once and walking the ppid graph.
 *
 * POSIX-only (uses `ps`). Returns empty list on Windows or if `ps` is
 * unavailable.  `rootPid` itself is NOT included.
 */
export declare function collectDescendants(rootPid: number, logger: Logger): number[];
export declare function errorMessage(err: unknown): string;
export declare function isErrno(err: unknown, code: string): boolean;
export declare function makeId(prefix: string): string;
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