inject swc helpers (vercel/turborepo#4060)

### Description

This fixed the `_extends` is not defined issue.

crates/next-dev-tests/tests/integration/next/basic/swc-helpers/input/pages/index.js

@@ -0,0 +1,25 @@
+import { useEffect } from "react";
+
+export default function Page() {
+  useEffect(() => {
+    // Only run on client
+    import("@turbo/pack-test-harness").then(runTests);
+  });
+
+  const props1 = { className: "foo" };
+  const props2 = { style: { color: "red" } };
+  // this will require the `_extends` helper on SSR
+  return (
+    <div id="test" {...props1} {...props2}>
+      Hello World
+    </div>
+  );
+}
+
+function runTests() {
+  it("should render the #test element in red and with class foo", () => {
+    const el = document.getElementById("test");
+    expect(el.style.color).toBe("red");
+    expect(el.className).toBe("foo");
+  });
+}

crates/turbopack-ecmascript/src/parse.rs

@@ -289,6 +289,10 @@ async fn parse_content(
                 transform.apply(&mut parsed_program, &context).await?;
             }
 
+            parsed_program.visit_mut_with(
+                &mut swc_core::ecma::transforms::base::helpers::inject_helpers(unresolved_mark),
+            );
+
             let eval_context = EvalContext::new(&parsed_program, unresolved_mark);
 
             Ok::<ParseResult, anyhow::Error>(ParseResult::Ok {