This package is an integration layer between R's sf package and Julia's GeoInterface ecosystem. It defines RCall.jl methods to materialize sfc and sfg objects as GeoInterface.jl wrapper geometries, complete with CRS information.
Simply run using Pkg; Pkg.add(url = "https://github.com/JuliaGeo/RCallSFBridge.jl") in your Julia REPL. Ensure that you have the sf library installed in whichever R installation RCall.jl uses.
using RCallSFBridgeis all that's needed, then you can use RCall's rcopy function or @rget macro to get your R data. Conversion is performed automatically and needs no input from the user.