import type { IncomingMessage, ServerResponse } from "http";
/**
 * Read and size-limit an HTTP request body.
 *
 * Responds with 413 and destroys the request if the body exceeds `maxBytes`.
 * Resolves with the raw body string on success, or `null` if the size limit
 * was exceeded (the response has already been sent in that case).
 */
export declare function readRawBody(req: IncomingMessage, res: ServerResponse, maxBytes: number): Promise<string | null>;
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