R tmap: How to adjust the legend frame line width

Question

I am trying to make a map with the cool tmap package and I cannot figure it out how to adjust the legend frame line width. I checked the impressive list of tm_layout arguments, but the closest I found was frame.lwd However,that refers to the frame of the map. I took the guess with legend.frame.lwd but that is not defined. Here is a toy example:

library(tmap)
data(Europe)

tm_shape(Europe) +
  tm_polygons("well_being", textNA="Non-European countries", title="Well-Being Index") +
  tm_text("iso_a3", size="AREA", root=5) +
  tm_layout(legend.position = c("RIGHT","TOP"),
            legend.frame = TRUE,
            frame.lwd = 5) # legend.frame.lwd does not exist

Answer 1

In the newer versions of tmap , the argument legend.frame.lwd was included with this commit . Here is an example, using tmap version 2.2:

library(tmap)
data("World")

tm_shape(World) +
  tm_polygons("HPI") +
  tm_layout(legend.frame = TRUE,
            frame.lwd = 5,
            legend.frame.lwd = 5)