Add typing for proxyReqOptDecorator option

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

@@ -10,3 +10,11 @@ proxy('www.google.com', {});
 proxy('www.google.com', {
     proxyReqPathResolver: (req) => req.url,
 });
+
+proxy('www.google.com', {
+    proxyReqOptDecorator(proxyReqOpts, srcReq) {
+        console.log(proxyReqOpts.headers, proxyReqOpts.method);
+        console.log(srcReq.url, srcReq.cookies);
+        return proxyReqOpts;
+    }
+});

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

@@ -5,9 +5,11 @@
 // TypeScript Version: 2.2
 
 import { RequestHandler, Request } from "express";
+import { RequestOptions } from "http";
 
 export interface ProxyOptions {
     proxyReqPathResolver?: (req: Request) => string;
+    proxyReqOptDecorator?: (proxyReqOpts: RequestOptions, srcReq: Request) => RequestOptions;
 }
 
 declare function proxy(host: string, options?: ProxyOptions): RequestHandler;