Virus found while install: PUA:MacOS/Ngrok!MTB
${\color{red}Virus warning}$
$${\color{red}PUA:MacOS/Ngrok!MTB}$$
file: D:\polygonjs\mytestproject\node_modules\ngrok\bin\ngrok
PUA:MacOS/Ngrok!MTB is a detection from a security program, such as Microsoft Defender, that identifies a potentially unwanted application related to the legitimate tool, Ngrok. It is not necessarily a virus, but a PUA can perform unwanted actions or increase security risks, which is why antivirus software may flag it. The !MTB suffix likely indicates the specific threat signature used by the antivirus vendor
https://www.trendmicro.com/vinfo/us/threat-encyclopedia/malware/pua.win64.ngrok.e
???
ngrok is one of the dependencies used by polygonjs to enable multiplayer. I'm not sure why it is triggering your anti-virus, it's a pretty legitimate library.
I'll look into upgrading it, maybe newer versions would not trigger it.