/// <reference types="node" />
import { Readable } from 'stream';
/**
 * Verify the passed in xml is valid. Requires xmllib be installed
 *
 * Security: This function always pipes XML content via stdin to prevent
 * command injection vulnerabilities. Never pass user-controlled strings
 * as file path arguments to xmllint.
 *
 * @param xml what you want validated (string or Readable stream)
 * @return {Promise<void>} resolves on valid rejects [error stderr]
 */
export declare function xmlLint(xml: string | Readable): Promise<void>;