/** 异步执行有时限的探测；超时直接结束等待，不依赖子进程关闭管道。 */
export declare function runExternalCommandAsync(command: string, args: readonly string[], options?: ExternalCommandOptions): Promise<string>;
export interface ExternalCommandOptions {
    cwd?: string;
    env?: NodeJS.ProcessEnv;
    timeoutMs?: number;
    maxBufferBytes?: number;
    input?: string;
    signal?: AbortSignal;
}
export declare class ExternalCommandError extends Error {
    readonly command: string;
    readonly args: readonly string[];
    readonly stderr: string;
    readonly timedOut: boolean;
    constructor(command: string, args: readonly string[], stderr: string, options?: ErrorOptions & {
        timedOut?: boolean;
    });
}
export declare function runExternalCommand(command: string, args: readonly string[], options?: ExternalCommandOptions): string;
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