dont use @swc/helpers in the server context as node support already modern syntax

npm-packages/meteor-rspack/rspack.config.js

@@ -118,6 +118,7 @@ export default function (inMeteor = {}, argv = {}) {
   const isDev = !!Meteor.isDevelopment || !isProd;
   const isTest = !!Meteor.isTest;
   const isClient = !!Meteor.isClient;
+  const isServer = !!Meteor.isServer;
   const isRun = !!Meteor.isRun;
   const isReactEnabled = !!Meteor.isReactEnabled;
   const isTestModule = !!Meteor.isTestModule;
@@ -203,12 +204,13 @@ export default function (inMeteor = {}, argv = {}) {
     console.log('[i] Meteor flags:', Meteor);
   }
 
+  const enableSwcExternalHelpers = !isServer && swcExternalHelpers;
   const isDevEnvironment = isRun && isDev && !isTest && !isNative;
   const swcConfigRule = createSwcConfig({
     isTypescriptEnabled,
     isJsxEnabled,
     isTsxEnabled,
-    externalHelpers: swcExternalHelpers,
+    externalHelpers: enableSwcExternalHelpers,
     isDevEnvironment,
   });
   // Expose swc config to use in custom configs

packages/babel-compiler/babel-compiler.js

@@ -281,7 +281,8 @@ BCp.processOneFileForTarget = function (inputFile, source) {
     const features = Object.assign({}, this.extraFeatures);
     const arch = inputFile.getArch();
 
-    if (arch.startsWith("os.")) {
+    const isNodeTarget = arch.startsWith("os.");
+    if (isNodeTarget) {
       // Start with a much simpler set of Babel presets and plugins if
       // we're compiling for Node 8.
       features.nodeMajorVersion = parseInt(process.versions.node, 10);
@@ -355,6 +356,7 @@ BCp.processOneFileForTarget = function (inputFile, source) {
             tsx: hasTSXSupport,
           },
           ...(hasSwcHelpersAvailable &&
+            !isNodeTarget &&
             (packageName == null ||
               !['modules-runtime'].includes(packageName)) && {
               externalHelpers: true,

tools/modern-tests/apps/react-router/package.json

@@ -8,6 +8,7 @@
     "visualize": "meteor --production --extra-packages bundle-visualizer"
   },
   "dependencies": {
+    "@aws-sdk/client-s3": "^3.879.0",
     "@babel/runtime": "^7.23.5",
     "@modelcontextprotocol/sdk": "^1.17.3",
     "@swc/helpers": "^0.5.17",

tools/modern-tests/apps/react-router/server/main.js

@@ -4,8 +4,10 @@ import { LinksCollection } from '/imports/api/links';
 import { StreamableHTTPClientTransport } from '@modelcontextprotocol/sdk/client/streamableHttp.js';
 import '@helper/alias';
 import ReactAlias from '@react/alias';
+import { S3Client } from '@aws-sdk/client-s3';
 
 console.log('@react/alias loaded', ReactAlias.version);
+console.log('S3client loaded', !!S3Client);
 
 async function insertLink({ title, url }) {
   await LinksCollection.insertAsync({ title, url, createdAt: new Date() });