The Leaflet JS mapping library has lots of plugins available. The Leaflet package for R provides direct support for some, but far from all, of these plugins, by providing R functions for invoking the plugins.
If you as an R user find yourself wanting to use a Leaflet plugin that isn't directly supported in the R package, you can use the technique shown here to load the plugin yourself and invoke it using JS code.
Very helpful. But I've struggled to figure out how I can extend this logic to enable the display of a Google Maps baselayers (via Pavel Shramov's Google plugin for Leaflet). If you could add another gist showing this, I'd be much obliged. Thanks!