Better error message when using coord_map() without {maproj} installed

[daattali]

It seems that the {mapproj} package is required for coord_map() to work. The documentation for the function does talk about {mapproj} but doesn't explicitly say that the package is required.

Using the example from the function documentation this is what I get:

library(ggplot2)
library(maps)
nzmap <- ggplot(map_data("nz"), aes(x = long, y = lat, group = group)) +
  geom_polygon(fill = "white", colour = "black")
nzmap + coord_map()

Error in loadNamespace(name) : there is no package called ‘mapproj‘

When running this function in isolation it's easy enough to understand I need to install the package. However when this is part of a large codebase that runs on one machine and then is attempted to run on another machine, the error has no indication of where it came from. When uploading a shiny app to shinyapps.io, shinyapps did not pick up that it needs to install {mapproj}, and looking at the error log did not make it clear where in my app {mapproj} is needed.

[atisor73]

I am facing the same issue. coord_map needs mapproj, and while the local app works with mapproj installed , deploying the app to shinyapps.io renders a blank map. I'm quite new to R... is the solution to then directly add mapproj to the renv.lock file?