/**
 * @file
 *
 * Cross-platform helper to kill a child process and its entire process tree.
 */
import type { ChildProcess } from 'node:child_process';
/**
 * Kills a child process and its entire process tree.
 *
 * @param child - The child process to kill.
 */
export declare function killProcessTree(child: ChildProcess): void;
/**
 * Kills a process tree by PID, for a process this run did not spawn itself — an
 * Appium server left listening by an earlier run, identified through its marker
 * (`appium-server-marker.ts`).
 *
 * On Windows, `child.kill()` only sends SIGTERM to the direct process,
 * leaving spawned grandchildren (e.g. Electron renderer/GPU helpers, QEMU,
 * UiAutomator) alive. `taskkill /F /T /PID` forcefully terminates the entire tree.
 *
 * @param pid - The PID whose process tree to kill.
 */
export declare function killProcessTreeByPid(pid: number): void;