While fontawesome 4.7.0 works smoothly, setting version = "5.13.0" doesn't work.
From the documentation:
nodes <- data.frame(id = 1:3, group = c("B", "A", "B"))
edges <- data.frame(from = c(1,2), to = c(2,3))
visNetwork(nodes, edges, width = "100%") %>%
visGroups(groupname = "A", shape = "icon", icon = list(code = "f0c0", size = 75)) %>%
visGroups(groupname = "B", shape = "icon", icon = list(code = "f007", color = "red")) %>%
visLegend() %>%
addFontAwesome(version = "5.13.0")
