This roclet rebuilds outdated vignettes with tools::buildVignette, but we no longer recommend it because we no longer recommend storing built vignettes in a package.
By default, it will rebuild all vignettes if the source file is newer than
the output pdf or html. (This means it will automatically re-build the
vignette if you change the vignette source, but not when you
change the R code). If you want finer control, add a Makefile to
vignettes/ and roxygen2 will use that instead.
To prevent RStudio from re-building the vignettes again when checking
your package, add --no-build-vignettes to the "Build Source Package"
field in your project options.