Version

v24.11.0

Platform

Microsoft Windows NT 10.0.26100.0 x64

Subsystem

No response

What steps will reproduce the bug?

Run the following code on Windows.

process.env = {};
console.log(require('os').tmpdir());

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

Frequency is 100%

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

os.tmpdir() should return a correct temporary directory path. Ideally it should return a value returned from the platform-specific APIs like GetTempPath2W. Or it should raise an error that it could not make a proper path.

What do you see instead?

os.tmpdir() returns the incorrect directory path undefined\temp.

Additional information

This issue happens when the node process is run in some separate sandboxed environments (for example, testing environment which wants to avoid effects by environment variables).

Current implementation: