util: inspect constructor closer

This adds an extra check to `util.inspect` to closer inspect object
constructors in case there's not much other information about the
constructor.

PR-URL: https://github.com/nodejs/node/pull/27522
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Michaël Zasso <targos@protonmail.com>
Reviewed-By: Rich Trott <rtrott@gmail.com>
Reviewed-By: Yongsheng Zhang <zyszys98@gmail.com>

1 files changed, 11 insertions, 0 deletions

diff --git a/src/node_util.cc b/src/node_util.cc
index 180c58c416..0c498e2838 100644
--- a/src/node_util.cc
+++ b/src/node_util.cc
@@ -58,6 +58,16 @@ static void GetOwnNonIndexProperties(
   args.GetReturnValue().Set(properties);
 }
 
+static void GetConstructorName(
+    const FunctionCallbackInfo<Value>& args) {
+  CHECK(args[0]->IsObject());
+
+  Local<Object> object = args[0].As<Object>();
+  Local<String> name = object->GetConstructorName();
+
+  args.GetReturnValue().Set(name);
+}
+
 static void GetPromiseDetails(const FunctionCallbackInfo<Value>& args) {
   // Return undefined if it's not a Promise.
   if (!args[0]->IsPromise())
@@ -262,6 +272,7 @@ void Initialize(Local<Object> target,
   env->SetMethodNoSideEffect(target, "previewEntries", PreviewEntries);
   env->SetMethodNoSideEffect(target, "getOwnNonIndexProperties",
                                      GetOwnNonIndexProperties);
+  env->SetMethodNoSideEffect(target, "getConstructorName", GetConstructorName);
 
   env->SetMethod(target, "arrayBufferViewHasBuffer", ArrayBufferViewHasBuffer);
   Local<Object> constants = Object::New(env->isolate());