[Bun.js] Fix entry point to only call default if it was a CommonJS transformed function

src/bundler.zig

@@ -3482,7 +3482,7 @@ pub const ServerEntryPoint = struct {
             \\//Auto-generated file
             \\import * as start from '{s}{s}';
             \\export * from '{s}{s}';
-            \\if ('default' in start && typeof start.default == 'function') {{
+            \\if ('default' in start && "__internalIsCommonJSNamespace" in globalThis && __internalIsCommonJSNamespace(start)) {{
             \\  start.default();
             \\}}
         ,

src/runtime.footer.js

@@ -19,6 +19,9 @@ export var regeneratorRuntime = BUN_RUNTIME.regeneratorRuntime;
 export var __exportValue = BUN_RUNTIME.__exportValue;
 export var __exportDefault = BUN_RUNTIME.__exportDefault;
 export var $$bun_runtime_json_parse = JSON.parse;
+export var __internalIsCommonJSNamespace =
+  BUN_RUNTIME.__internalIsCommonJSNamespace;
 
+globalThis.__internalIsCommonJSNamespace ||= __internalIsCommonJSNamespace;
 globalThis.require ||= BUN_RUNTIME.__require;
 globalThis.self ||= globalThis;

src/runtime.js

@@ -136,6 +136,11 @@ export var __commonJS = (cb, name) => {
 
 export var __cJS2eSM = __commonJS;
 
+export var __internalIsCommonJSNamespace = (namespace) =>
+  typeof namespace === "object" &&
+  "default" in namespace &&
+  namespace.default[cjsRequireSymbol];
+
 export var __require = (namespace) => {
   const namespaceType = typeof namespace;
   if (namespaceType === "function" && namespace[cjsRequireSymbol])

src/runtime.version

@@ -1 +1 @@
-7be53da538434cb0
+c6d7615ce951f3ae