This roclet automates the production of a NAMESPACE file,
see Writing R Extensions.
(https://cran.r-project.org/doc/manuals/R-exts.pdf) for details.
The NAMESPACE is generated in two passes: the first generates only
import directives (because this can be computed without evaluating package
code), and the second generates everything (after the packaege has been
loaded).
namespace_roclet()vignette("namespace", package = "roxygen2")
Other roclets: rd_roclet,
vignette_roclet