$ python tee_test.py [stdout] hello [stderr] hello [stdout] world [stderr] world [stdout] not going to be written to file [stderr] not going to be written to file $ cat mystdout.txt [stdout] hello ...

I am not even sure if this should be fixed on the Haxe side. So feel free to close this issue if you think that it is on the VSCode side. This error is mostly related ...