filesize -package:hackage-security -package:http-conduit -package:tar-conduit -package:pantry is:exact -package:slack-api

Size of the file in bytes. If this file is a symbolic link the size is the length of the pathname it contains.
File size.
Set to 0 if unknown or a directory
Size of the file in bytes. Does not follow symlinks
Get size of a file in the archive.