• Version: 12.4.0
• Platform: Darwin C02WJ0U4HTDG 17.7.0 Darwin Kernel Version 17.7.0: Wed Apr 24 21:17:24 PDT 2019; root:xnu-4570.71.45~1/RELEASE_X86_64 x86_64
• Subsystem: tty

I found out recently that in a worker which is run with worker_threads, tty.isatty(1) returns True whereas process.stdout.isTTY returns False.

This led to a weird issue in mocha - a popular library for testing: mochajs/mocha#3955