import { IncomingMessage } from 'node:http';
/**
 * Reads the entire request body into a Buffer.
 * Resolves to a Buffer containing concatenated data chunks,
 * or null if an error occurs during reading.
 *
 * @param req incoming HTTP message to read the body from.
 * @returns promise that resolves with the full body Buffer or null on error.
 */
export default function readBodyBuffer(req: IncomingMessage): Promise<Buffer | null>;