REPLServer seems to override the built-in Object

[ranjan-purbey]

Version

v16.7.0, v14.15.1, v12.16.1

Platform

Linux 5.11.0-31-generic # 33-Ubuntu SMP Wed Aug 11 13:19:04 UTC 2021 x86_64 x86_64 x86_64 GNU/Linux

Subsystem

No response

What steps will reproduce the bug?

1. Create isObject.js

module.exports = (x) => x instanceof Object;

2. Create repl.js

require("repl").start();

3. Run repl.js

$ node repl.js
> const obj = {};
> obj instanceof Object; // -> true
> require("./isObject")(obj); // -> false

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

Always

What is the expected behavior?

The Object instance created inside repl should return true for isObject

What do you see instead?

The Object instance returns false for isObject

Additional information

No response

[BridgeAR]

This is a fundamental issue in the REPL design. It is very difficult to fix this. It might be possible to use a child process to improve the situation but such implementation is not trivial.

Former similar issues: #27859