avoid double declare globals

vercel · Jun 12, 2023 · 5e4c3a6 · 5e4c3a6
1 parent 25cd8bc
commit 5e4c3a6
Showing 1 changed file with 7 additions and 5 deletions.
diff --git a/packages/next/src/server/web/globals.ts b/packages/next/src/server/web/globals.ts
@@ -60,11 +60,13 @@ function enhanceGlobals() {
 
   // to allow building code that import but does not use node.js modules,
   // webpack will expect this function to exist in global scope
-  Object.defineProperty(globalThis, '__import_unsupported', {
-    value: __import_unsupported,
-    enumerable: false,
-    configurable: false,
-  })
+  if (!Object.hasOwn(globalThis, '__import_unsupported')) {
+    Object.defineProperty(globalThis, '__import_unsupported', {
+      value: __import_unsupported,
+      enumerable: false,
+      configurable: false,
+    })
+  }
 
   // Eagerly fire instrumentation hook to make the startup faster.
   void ensureInstrumentationRegistered()