Merge pull request #31973 from malthe/add-request-response-prototypes

[express] Add exposed prototypes

types/express/index.d.ts

@@ -30,6 +30,13 @@ declare namespace e {
      */
     var json: typeof bodyParser.json;
 
+    /**
+     * These are the exposed prototypes.
+     */
+    var application: Application;
+    var request: Request;
+    var response: Response;
+
     /**
      * This is a built-in middleware function in Express. It serves static files and is based on serve-static.
      */