How to list recursive package dependency prior to installation/upgrade of a package

tools::package_dependencies("lme4")

$lme4
 [1] "Matrix"    "methods"   "stats"     "graphics"  "grid"      "splines"
 [7] "utils"     "parallel"  "MASS"      "lattice"   "boot"      "nlme"
[13] "minqa"     "nloptr"    "Rcpp"      "RcppEigen"

tools::package_dependencies("lme4", recursive=TRUE)

$lme4
 [1] "Matrix"    "methods"   "stats"     "graphics"  "grid"      "splines"
 [7] "utils"     "parallel"  "MASS"      "lattice"   "boot"      "nlme"
[13] "minqa"     "nloptr"    "Rcpp"      "RcppEigen" "grDevices"

Use reverse=TRUE to list packages that depend on the given package.
Bill Dunlap
TIBCO Software
wdunlap tibco.com


On Thu, Mar 14, 2019 at 12:09 PM Sebastien Bihorel <

Hi

Is there an elegant way to recursive list all dependencies of a package
prior to its installation or upgrade?

I am particularly interested in finding which of the packages currently
installed in my test/production environment would require an upgrade prior
to actual installation/upgrade of a package.

Can the packrat package help with this?

Thank you

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