data() command with no arguments lists all the
datasets available via data in attached packages, and to do so a
per-package list is installed. Creating that list at install time can
be slow for packages with huge datasets, and can be expedited by a
supplying ‘data/datalist’ file.
add_datalist(pkgpath, force = FALSE)R CMD build will call this function to add a data list to
packages with 1MB or more of data.It is also helpful to give a ‘data/datalist’ file in packages whose datasets have many dependencies, including loading the packages itself (and maybe others).
data.The ‘Writing R Extensions’ manual.