Natively support CommonJS at runtime (#3104)

* Natively support CommonJS at runtime

* cleanup how getters are handled, add fast path

* more consistent with node

* use * As

* Remove thrown modules on exception

* Handle exception better

---------

Co-authored-by: Jarred Sumner <709451+Jarred-Sumner@users.noreply.github.com>

1 files changed, 6 insertions, 0 deletions

diff --git a/src/bun.js/bindings/ModuleLoader.cpp b/src/bun.js/bindings/ModuleLoader.cpp
index 75981f5b3..f4e96130b 100644
--- a/src/bun.js/bindings/ModuleLoader.cpp
+++ b/src/bun.js/bindings/ModuleLoader.cpp
@@ -35,6 +35,7 @@
 #include "../modules/NodeModuleModule.h"
 #include "../modules/TTYModule.h"
 #include "node_util_types.h"
+#include "CommonJSModuleRecord.h"
 
 namespace Bun {
 using namespace Zig;
@@ -475,6 +476,11 @@ static JSValue fetchSourceCode(
         Bun__transpileFile(bunVM, globalObject, specifier, referrer, res, false);
     }
 
+    if (res->success && res->result.value.commonJSExportsLen) {
+        auto source = Bun::createCommonJSModule(globalObject, res->result.value);
+        return rejectOrResolve(JSSourceCode::create(vm, WTFMove(source)));
+    }
+
     if (!res->success) {
         throwException(scope, res->result.err, globalObject);
         auto* exception = scope.exception();