Inconsistent presence of property in contextified object

[lachrist]

Version

v22.0.0

Platform

Darwin Laurents-MacBook-Air.local 23.2.0 Darwin Kernel Version 23.2.0: Wed Nov 15 21:59:33 PST 2023; root:xnu-10002.61.3~2/RELEASE_ARM64_T8112 arm64

Subsystem

vm

What steps will reproduce the bug?

import { createContext, runInContext } from "vm";
console.log(
  runInContext(
    `
      "use strict";
      ({
        hasOwn: Object.hasOwn(globalThis, "toLocaleString"),
        descriptor: Reflect.getOwnPropertyDescriptor(globalThis, "toLocaleString"),
      });
    `,
    createContext(),
  ),
); // { hasOwn: true, descriptor: undefined }

Tested in both v22.0.0 and v20.12.2.

How often does it reproduce? Is there a required condition?

No required condition.

What is the expected behavior? Why is that the expected behavior?

Either the property is present or it is not. So either { hasOwn: false, descriptor: undefined} and { hasOwn: true, descriptor: { ... } } would be better.

What do you see instead?

{ hasOwn: true, descriptor: undefined }

Additional information

No response

[benjamingr]

@nodejs/vm

[targos]

I understand why it happens:

• Object.has calls our PropertyGetterCallback interceptor
• We call GetRealNamedProperty, which follows the prototype chain

node/src/node_contextify.cc

Lines 477 to 478 in 6aa9047

	maybe_rv =
	ctx->global_proxy()->GetRealNamedProperty(context, property);

I don't know how to fix it though. There are cases where we want to follow the protoype and other where we don't, but I'm not sure V8 gives us enough information to know in which case we are.

[targos]

Maybe the solution is to set a NamedPropertyQueryCallback (we currently don't).