a logical indicating whether dependencies of pkg
and their
dependencies (and so on) should be included.
Can also be a character vector listing the types of dependencies, a subset
of c("Depends", "Imports", "LinkingTo", "Suggests", "Enhances")
.
Character string "all"
is shorthand for that vector, character string
"most"
for the same vector without "Enhances"
, character string "strong"
(default) for the first three elements of that vector.