filesize -package:hackage-security -package:http-client -package:unix -package:pantry -package:ghc -package:LibZip -package:unliftio -package:directory package:base

For a handle hdl which attached to a physical file, hFileSize hdl returns the size of that file in 8-bit bytes.
hSetFileSize hdl size truncates the physical file with handle hdl to size bytes.