/**
 * Code below is inspired by tree-kill-sync and tree-kill:
 * - https://github.com/dvpnt/tree-kill-sync/blob/master/index.js
 * - https://github.com/pkrumins/node-tree-kill/blob/master/index.js
 */
/**
 * Kills a process with the specified PID using the given signal.
 * The error ESRCH will be ignored.
 *
 * @param {number} pid - The PID of the process to be killed.
 * @param {number | string} signal - The signal to send for termination.
 */
export declare const killPid: (pid: number, signal: number | string) => void;
/**
 * Recursively kills a process and all its child processes using the specified
 * signal - i.e. terminates the whole process tree.
 *
 * @param {number} pid - process pid to be killed alongside children.
 * @param {number | string} signal - the signal to send for termination.
 */
export declare const treeKill: (pid: number, signal: string | number) => void;