/**
 * Kill a child and everything it spawned.
 *
 * The direct child is often only a shell: `cmd.exe /c npm …` on Windows, and on
 * POSIX anything that forks. Signalling it alone leaves the real work running.
 * Best-effort by design — a tree we cannot kill must not throw, because the
 * caller settles either way.
 */
export declare function killProcessTree(child: {
    pid?: number;
    kill?: (signal?: NodeJS.Signals | number) => boolean;
}): void;
export declare function runExec(command: string, args: string[], opts?: number | {
    timeoutMs?: number;
    maxBuffer?: number;
}): Promise<{
    stdout: string;
    stderr: string;
}>;
export type SpawnResult = {
    stdout: string;
    stderr: string;
    code: number | null;
    signal: NodeJS.Signals | null;
    killed: boolean;
};
export type CommandOptions = {
    timeoutMs: number;
    cwd?: string;
    input?: string;
    env?: NodeJS.ProcessEnv;
    windowsVerbatimArguments?: boolean;
};
export declare function runCommandWithTimeout(argv: string[], optionsOrTimeout: number | CommandOptions): Promise<SpawnResult>;