Fix build on older versions

Author: timfish

module.cc

@@ -2,6 +2,7 @@
 #include <future>
 #include <mutex>
 #include <node.h>
+#include <node_version.h>
 
 // Platform-specific includes for time functions
 #ifdef _WIN32
@@ -97,6 +98,7 @@ JsStackFrames GetStackFrames(Isolate *isolate) {
   return frames;
 }
 
+#if NODE_MAJOR_VERSION >= 22
 static std::string ToJSONOrEmpty(Isolate *isolate, v8::Local<v8::Value> value) {
   auto context = isolate->GetCurrentContext();
   MaybeLocal<String> maybe_json = v8::JSON::Stringify(context, value);
@@ -109,10 +111,12 @@ static std::string ToJSONOrEmpty(Isolate *isolate, v8::Local<v8::Value> value) {
   }
   return "";
 }
+#endif
 
 // Function to fetch the thread state from the async context store
 std::string GetThreadState(Isolate *isolate,
                            v8::Global<v8::Value> async_local_storage) {
+#if NODE_MAJOR_VERSION >= 22
   // Node.js stores the async local storage in the isolate's
   // "ContinuationPreservedEmbedderData" map, keyed by the
   // AsyncLocalStorage instance.
@@ -129,6 +133,7 @@ std::string GetThreadState(Isolate *isolate,
       return ToJSONOrEmpty(isolate, val.ToLocalChecked());
     }
   }
+#endif
 
   return "";
 }