diff --git a/src/bun.js/modules/NodeUtilTypesModule.h b/src/bun.js/modules/NodeUtilTypesModule.h
index cc4117701e..c5275be052 100644
--- a/src/bun.js/modules/NodeUtilTypesModule.h
+++ b/src/bun.js/modules/NodeUtilTypesModule.h
@@ -112,32 +112,6 @@ JSC_DEFINE_HOST_FUNCTION(jsFunctionIsNativeError,
     if (value.isCell()) {
         if (value.inherits<JSC::ErrorInstance>() || value.asCell()->type() == ErrorInstanceType)
             return JSValue::encode(jsBoolean(true));
-
-        VM& vm = globalObject->vm();
-        auto scope = DECLARE_THROW_SCOPE(vm);
-        JSObject* object = value.toObject(globalObject);
-
-        // node util.isError relies on toString
-        // https://github.com/nodejs/node/blob/cf8c6994e0f764af02da4fa70bc5962142181bf3/doc/api/util.md#L2923
-        PropertySlot slot(object, PropertySlot::InternalMethodType::VMInquiry, &vm);
-        if (object->getPropertySlot(globalObject,
-                vm.propertyNames->toStringTagSymbol, slot)) {
-            EXCEPTION_ASSERT(!scope.exception());
-            if (slot.isValue()) {
-                JSValue value = slot.getValue(globalObject, vm.propertyNames->toStringTagSymbol);
-                if (value.isString()) {
-                    String tag = asString(value)->value(globalObject);
-                    if (UNLIKELY(scope.exception()))
-                        scope.clearException();
-                    if (tag == "Error"_s)
-                        return JSValue::encode(jsBoolean(true));
-                }
-            }
-        }
-
-        JSValue proto = object->getPrototype(vm, globalObject);
-        if (proto.isCell() && (proto.inherits<JSC::ErrorInstance>() || proto.asCell()->type() == ErrorInstanceType || proto.inherits<JSC::ErrorPrototype>()))
-            return JSValue::encode(jsBoolean(true));
     }
 
     return JSValue::encode(jsBoolean(false));
diff --git a/test/js/node/test/parallel/test-util.js b/test/js/node/test/parallel/test-util.js
new file mode 100644
index 0000000000..568ecec769
--- /dev/null
+++ b/test/js/node/test/parallel/test-util.js
@@ -0,0 +1,88 @@
+// Copyright Joyent, Inc. and other Node contributors.
+//
+// Permission is hereby granted, free of charge, to any person obtaining a
+// copy of this software and associated documentation files (the
+// "Software"), to deal in the Software without restriction, including
+// without limitation the rights to use, copy, modify, merge, publish,
+// distribute, sublicense, and/or sell copies of the Software, and to permit
+// persons to whom the Software is furnished to do so, subject to the
+// following conditions:
+//
+// The above copyright notice and this permission notice shall be included
+// in all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
+// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
+// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
+// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
+// USE OR OTHER DEALINGS IN THE SOFTWARE.
+
+'use strict';
+// Flags: --expose-internals
+const common = require('../common');
+const assert = require('assert');
+const util = require('util');
+const context = require('vm').runInNewContext;
+
+// isArray
+assert.strictEqual(util.isArray([]), true);
+assert.strictEqual(util.isArray(Array()), true);
+assert.strictEqual(util.isArray(new Array()), true);
+assert.strictEqual(util.isArray(new Array(5)), true);
+assert.strictEqual(util.isArray(new Array('with', 'some', 'entries')), true);
+assert.strictEqual(util.isArray(context('Array')()), true);
+assert.strictEqual(util.isArray({}), false);
+assert.strictEqual(util.isArray({ push: function() {} }), false);
+assert.strictEqual(util.isArray(/regexp/), false);
+assert.strictEqual(util.isArray(new Error()), false);
+assert.strictEqual(util.isArray({ __proto__: Array.prototype }), false);
+
+// _extend
+assert.deepStrictEqual(util._extend({ a: 1 }), { a: 1 });
+assert.deepStrictEqual(util._extend({ a: 1 }, []), { a: 1 });
+assert.deepStrictEqual(util._extend({ a: 1 }, null), { a: 1 });
+assert.deepStrictEqual(util._extend({ a: 1 }, true), { a: 1 });
+assert.deepStrictEqual(util._extend({ a: 1 }, false), { a: 1 });
+assert.deepStrictEqual(util._extend({ a: 1 }, { b: 2 }), { a: 1, b: 2 });
+assert.deepStrictEqual(util._extend({ a: 1, b: 2 }, { b: 3 }), { a: 1, b: 3 });
+
+assert.strictEqual(util.toUSVString('string\ud801'), 'string\ufffd');
+
+{
+  assert.strictEqual(util.types.isNativeError(new Error()), true);
+  assert.strictEqual(util.types.isNativeError(new TypeError()), true);
+  assert.strictEqual(util.types.isNativeError(new SyntaxError()), true);
+  assert.strictEqual(util.types.isNativeError(new (context('Error'))()), true);
+  assert.strictEqual(
+    util.types.isNativeError(new (context('TypeError'))()),
+    true
+  );
+  assert.strictEqual(
+    util.types.isNativeError(new (context('SyntaxError'))()),
+    true
+  );
+  assert.strictEqual(util.types.isNativeError({}), false);
+  assert.strictEqual(
+    util.types.isNativeError({ name: 'Error', message: '' }),
+    false
+  );
+  assert.strictEqual(util.types.isNativeError([]), false);
+  assert.strictEqual(
+    util.types.isNativeError({ __proto__: Error.prototype }),
+    false
+  );
+  // assert.strictEqual(
+  //   util.types.isNativeError(new errors.codes.ERR_IPC_CHANNEL_CLOSED()),
+  //   true
+  // );
+}
+
+assert.throws(() => {
+  util.stripVTControlCharacters({});
+}, {
+  code: 'ERR_INVALID_ARG_TYPE',
+  message: 'The "str" argument must be of type string.' +
+           common.invalidArgTypeHelper({})
+});