In this question we learn that we can use FindFile to get the disk location of a package. However, I have some packages that are installed into my $USER/Library/Mathematica/Applications/$ directory by symbolic link.

I'd like to be able to resolve the "true" path of these packages, much like the GNU readlink utility does. Does Mathematica have such a function built in? If not, by what other [preferably cross-platform] methods can this be accomplished?

Example on my machine:

AbsoluteFileName["/Library/TeX/texbin"]
(* "/usr/local/texlive/2019/bin/x86_64-darwin" *)

After a bit more fiddling around I found FileInformation, an undocumented function which takes a file name as an argument.

FileInformation[FindFile["myPackage"]] returns

{AbsoluteFileName->/absolute/path/to/myPackage.wl,
BlockCount->24,
BlockSize->4096,
ByteCount->8474,
CreationDate->Thu 17 Oct 2019 11:06:04GMT-4.,
Device->16777220,
DirectoryName->$HOME/Library/Mathematica/Applications, FileAttributes->Missing[NotAvailable], FileBaseName->myPackage,FileExtension->wl, FileName->$HOME/Library/Mathematica/Applications/myPackage.wl,
FileType->File,
GID->20,
GroupName->Missing[NotAvailable],
Inode->28731823,
LastAccessDate->Wed 23 Oct 2019 18:16:13GMT-4.,
LastModificationDate->Wed 23 Oct 2019 18:16:10GMT-4.,
SO, what I was looking for was "AbsoluteFileName"/.FileInformation[FindFile["myPackage"]]$$$$