fix(request) handle undefined/null/empty signal on request (#5503)

* handle undefined/null/empty signal on request

* better approach

src/bun.js/webcore/request.zig

@@ -608,9 +608,8 @@ pub const Request = struct {
             }
 
             if (!fields.contains(.signal)) {
-                if (value.get(globalThis, "signal")) |signal_| {
+                if (value.getTruthy(globalThis, "signal")) |signal_| {
                     fields.insert(.signal);
-
                     if (AbortSignal.fromJS(signal_)) |signal| {
                         //Keep it alive
                         signal_.ensureStillAlive();

test/js/web/request/request.test.ts

@@ -0,0 +1,37 @@
+import { test, expect } from "bun:test";
+
+test("request can receive undefined signal", async () => {
+  const request = new Request("http://example.com/", {
+    method: "POST",
+    headers: {
+      "Content-Type": "text/bun;charset=utf-8",
+    },
+    body: "bun",
+    signal: undefined,
+  });
+  expect(request.method).toBe("POST");
+  // @ts-ignore
+  const clone = new Request(request);
+  expect(clone.method).toBe("POST");
+  expect(clone.headers.get("content-type")).toBe("text/bun;charset=utf-8");
+  expect(await request.text()).toBe("bun");
+  expect(await clone.text()).toBe("bun");
+});
+
+test("request can receive null signal", async () => {
+  const request = new Request("http://example.com/", {
+    method: "POST",
+    headers: {
+      "Content-Type": "text/bun;charset=utf-8",
+    },
+    body: "bun",
+    signal: null,
+  });
+  expect(request.method).toBe("POST");
+  // @ts-ignore
+  const clone = new Request(request);
+  expect(clone.method).toBe("POST");
+  expect(clone.headers.get("content-type")).toBe("text/bun;charset=utf-8");
+  expect(await request.text()).toBe("bun");
+  expect(await clone.text()).toBe("bun");
+});