dependsOnPkgs(pkgs, dependencies = c("Depends", "Imports", "LinkingTo"), recursive = TRUE, lib.loc = NULL, installed = utils::installed.packages(lib.loc, fields = "Enhances"))c("Depends", "Imports", "LinkingTo", "Suggests", "Enhances").
Character string "all" is shorthand for that vector, and
"most" currently shorthand for these apart from "Enhances".NULL
for all known trees (see .libPaths).installed.packages.pkgs.