export interface PSTreeChild {
    PPID: string;
    PID: string;
    STAT: string;
    COMMAND: string;
}
export type Callback = (err: Error | null, children?: PSTreeChild[]) => void;
export declare function psTree(pid: number | string): Promise<PSTreeChild[]>;
export declare function psTree(pid: number | string, callback: Callback): void;
export declare const pstree: typeof psTree;