Allow IncomingRequest.req to be overwritten. (#4154)

* Allow IncomingRequest.req to be overwritten.

* add test

* fix test

* yoo

src/js/node/http.ts

@@ -607,7 +607,7 @@ class IncomingMessage extends Readable {
     this.#fakeSocket = socket;
 
     this.url = url.pathname + url.search;
-    this.#nodeReq = nodeReq;
+    this.#nodeReq = this.req = nodeReq;
     assignHeaders(this, req);
   }
 
@@ -624,10 +624,6 @@ class IncomingMessage extends Readable {
   #type;
   #nodeReq;
 
-  get req() {
-    return this.#nodeReq;
-  }
-
   _construct(callback) {
     // TODO: streaming
     if (this.#type === "response" || this.#noBody) {

test/js/node/http/node-http.test.ts

@@ -733,4 +733,21 @@ describe("node:http", () => {
     expect(() => validateHeaderValue("Foo", undefined as any)).toThrow();
     expect(() => validateHeaderValue("Foo", "Bar\r")).toThrow();
   });
+
+  test("req.req = req", done => {
+    const server = createServer((req, res) => {
+      req.req = req;
+      res.write(req.req === req ? "ok" : "fail");
+      res.end();
+    });
+    server.listen({ port: 0 }, async (_err, host, port) => {
+      try {
+        const x = await fetch(`http://${host}:${port}`).then(res => res.text());
+        expect(x).toBe("ok");
+        done();
+      } catch (error) {
+        done(error);
+      }
+    });
+  });
 });