express-http-proxy: Add limit parameter for proxy options (#35014)

* Add limit parameter for proxy options

* Remove null from type for limit

types/express-http-proxy/express-http-proxy-tests.ts

@@ -11,6 +11,14 @@ proxy('www.google.com', {
     proxyReqPathResolver: (req) => req.url,
 });
 
+proxy('www.google.com', {
+    limit: "10mb"
+});
+
+proxy('www.google.com', {
+    limit: 1024
+});
+
 proxy('www.google.com', {
     proxyReqOptDecorator(proxyReqOpts, srcReq) {
         console.log(proxyReqOpts.headers, proxyReqOpts.method);

types/express-http-proxy/index.d.ts

@@ -11,6 +11,12 @@ import { RequestOptions, IncomingHttpHeaders, OutgoingHttpHeaders } from "http";
 import { Response } from "express-serve-static-core";
 
 interface ProxyOptions {
+    /**
+     * The byte limit of the body. This is the number of bytes or any string
+     * format supported by `bytes`, for example `1000`, `'500kb'` or `'3mb'`.
+     * See https://github.com/stream-utils/raw-body/blob/master/index.d.ts
+     */
+    limit?: number | string;
     proxyReqPathResolver?: (req: Request) => string;
     proxyReqOptDecorator?: (proxyReqOpts: RequestOptions, srcReq: Request) => RequestOptions;
     userResHeaderDecorator?: (headers: IncomingHttpHeaders, userReq: Request, userRes: Response, proxyReq: Request, proxyRes: Response) => OutgoingHttpHeaders;