Fix exporting objects with non-configurable prototypes from RSCs

Fixes #10150

Author: devongovett

packages/core/integration-tests/test/react-server.js

@@ -614,11 +614,11 @@ describe('react server components', function () {
         it('should support inject CSS resources', async function () {
           await fsFixture(overlayFS, dir)`
           index.jsx:
-            import {Server} from './Page.jsx';
+            import {Server, foo} from './Page.jsx';
             function render() {
               return <Server />;
             }
-            output = {render};
+            output = {render, foo: foo.map(f => f * 2)};
 
           Page.jsx:
             "use server-entry";
@@ -627,6 +627,8 @@ describe('react server components', function () {
               return <h1>Server</h1>;
             }
 
+            export const foo = [1, 2, 3];
+
           server.css:
             .server { color: red }
         `;
@@ -656,6 +658,7 @@ describe('react server components', function () {
           );
 
           let res = (await run(b, {output: null}, {require: false})).output;
+          assert.deepEqual(res.foo, [2, 4, 6]);
           let output = res.render();
 
           output.type.$$typeof;

packages/runtimes/rsc/rsc-helpers.jsx

@@ -44,7 +44,7 @@ function createResourcesValueProxy(value, resources, bootstrapScript) {
 
     let proxy = new Proxy(value, {
       get(target, prop, receiver) {
-        if (prototypeProxy && prop === 'prototype') {
+        if (prototypeProxy && prop === 'prototype' && Object.getOwnPropertyDescriptor(target, 'prototype').configurable) {
           return prototypeProxy;
         }