The good news is that installing node version 14.7.6 allowed the build to complete successfully I was on node v16.14.0

Good to know
I hope Renaud will find a way to adapt JSweet accordingly.

Under what Java server did you try to run the war file?
Can you log the value of serverBaseUrl used at line 48 in writeHomeEdits.jsp? Maybe you could just adapt its initialization at line 32 to ensure it works in your case?