/**
 * Child process lifecycle management — extracted from runner.ts.
 *
 * Process group registration, signal propagation, and
 * single-child termination helpers.
 */
import { type ChildProcess } from "node:child_process";
export declare const isWindows: boolean;
export declare const SIGKILL_TIMEOUT_MS = 5000;
/** Register a child process group for cleanup on shutdown. */
export declare function registerChildGroup(pid: number, name: string): void;
/** Unregister a completed/stopped child process group. */
export declare function unregisterChildGroup(pid: number): void;
/**
 * Terminate all registered child process groups via SIGTERM (then SIGKILL after timeout).
 * Called on parent exit, SIGINT, SIGTERM, or pi-agent-flow:shutdown.
 */
export declare function terminateAllChildGroups(): void;
/**
 * Terminate a single child process with SIGTERM then SIGKILL fallback.
 * Handles both Windows (taskkill) and Unix (process group) semantics.
 */
export declare function terminateChildProcess(proc: ChildProcess, options?: {
    endStdin?: () => void;
    timeoutMs?: number;
    skipIfClosed?: () => boolean;
}): void;
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