fix: do not add ESM deps to optimizeDeps without a '.' export (#4855)

Author: schiller-manuel

packages/react-start-plugin/src/index.ts

@@ -104,7 +104,11 @@ export default createStartHandler({
           if (opts.name === '@tanstack/react-router-devtools') {
             return 'exclude'
           }
-          if ('react' in opts.peerDependencies) {
+          if (
+            opts.exports &&
+            '.' in opts.exports &&
+            'react' in opts.peerDependencies
+          ) {
             return 'include'
           }
           return undefined

packages/start-plugin-core/src/plugin.ts

@@ -47,6 +47,7 @@ export interface TanStackStartVitePluginCoreOptions {
   crawlPackages?: (opts: {
     name: string
     peerDependencies: Record<string, any>
+    exports?: Record<string, any>
   }) => 'include' | 'exclude' | undefined
 }
 // this needs to live outside of the TanStackStartVitePluginCore since it will be invoked multiple times by vite
@@ -110,6 +111,7 @@ export function TanStackStartVitePluginCore(
               const internalResult = opts.crawlPackages?.({
                 name: pkgJson.name,
                 peerDependencies,
+                exports: pkgJson.exports,
               })
               if (internalResult) {
                 if (internalResult === 'exclude') {