savewidget from htmlwidget in R , cannot save html file in another folder

Agreed.

here is a workaround:

f<-"ressources\\test.html"
saveWidget(map_leaflet,file.path(normalizePath(dirname(f)),basename(f)))

The issues appear to be that saveWidget does not work with relative pathnames and normalizePath does not work for paths to files that done exist yet.

I would call this a bug in saveWidget.

edit:

I have contribute what I think is an even better workaround to an existing open issue