Just encountered https://youtrack.jetbrains.com/issue/KT-61957 too in Beta2. Easy workaround is to go back to

values()

I tried reporting this a while back, and I failed to deliver a minimal reproducer

It's really just a matter of adding

@JsExport

. First time I'm in the position of exporting one

That makes sense then. My reproducer had no

@JsExport