What version of Oxlint are you using?

1.51.0

What command did you run?

oxlint

What does your .oxlintrc.json (or oxlint.config.ts) config file look like?

Please see: https://github.com/s-h-a-d-o-w/oxlint-repro

What happened?

When a config extends another, it doesn't inherit env and so globals can't be found.

I guess it's conceptually related to issues such as this: #19932
And this: #20073
In that you don't seem to merge configs at the moment?