Required dependencies that are not explicitly loaded

[gdurif]

Sometimes, some R packages are necessary for some code to work but not explicitly loaded in any notebook/scripts (for instance packages listed as dependency in Suggests field).

Example:

• yaml package required by RStudio to read Quarto markdown (.qmd) file
• farff package required to download some datasets on OpenML.org through the OpenML R package

So even after doing renv::install("this-package"), {this-package} will not be added to the renv.lock file as long as library(this-package) is not called somewhere.

It is possible to use renv::record("this-package") to manually add it to the renv.lock file but it will be removed by the next snapshot.

Per rstudio/renv#1018 the solution is to add a file deps.R containing as much library(.) call to load this type of required package that are never loaded, e.g.

library(yaml)
library(farff)

[gdurif]

I will modify the template to document this specific case.