What package does RStudio use to say "Package [name] required but is not installed."?

I'm trying to find which package is used to scan a script and tell you which packages are called in the script either via library(), require() or [package]:: ... I know that RStudio uses it to have the helpful installer prompt these days, but all of the help I get through Googling the problem is to much older solutions.


my guess that its not a function that is included in the rstudioapi that you could hope to access with R code, its in the Rstudio source proper, seems to be a java based library.

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