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Re:Warriorjs – An exciting game of programming and artificia... by olistic on Sunday May 13, 2018 @12:54PM (#17059821)
I found this to be an issue with Node 10, did you happen to be running that version? It was already fixed and a new version will be released soon (meanwhile you should be able to play with Node 8).
Re:Warriorjs – An exciting game of programming and artificia... by DEinspanjer on Sunday May 13, 2018 @09:34PM (#17062066)
Yep, I'm running Node v10.1.0

I worked around it by just copying the class as described in the website.