new "extensionless files" loader error, new node 18.17.0 only

[iambumblehead]

Version

18.17.0

the error does not occur using 18.16.0
the error does not occur using 20.*

Platform

win32

Subsystem

No response

What steps will reproduce the bug?

• use a windows environment and install node lts 18.17.0,
• clone this repo https://github.com/iambumblehead/esmock.git
• locally cd into esmock then npm install
• next cd into esmock tests/tests-source-map, upstream location here, then npm install && npm test
• see the error

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

It reproduces every time. Here is a link to a failed CI job that encountered the error, link

screenshot of the error from a win32 virtual machine

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

When npm test is called, the tests should pass.

Historically, for the last two years or so since that test was added, the test has passed in a matrix of win32 and linux environments running the three or four most recent major versions of node.

What do you see instead?

Additional information

thank you for giving this ticket your attention :)

[aduh95]

Hey, thanks for the detailed report, any chance you could send a repro that do not involve downloading code from the internet (i.e. no repo cloning, no npm install)?
Also, did you try with Node.js 20.x? That would be helpful to figure out the underlying bug.

[iambumblehead]

@aduh95 the issue does not occur using node 20.x

Creating a smaller repro case would be challenging for me now. I don't know if I will be able to do it