Description
Currently, copying files is implemented by reading the data of the source file and writing it to the new file, see fs-extra's implementation of copy. The problem is that this approach doesn't allow the OS to optimize file copying (such as by using direct disk-to-disk copy if it's available), nor does it allow the (optional or by default) use of reflink/CoW.
I'm specifically interested in making CoW (which is already available on some *nix file systems, including btrfs and zfs) available to nodejs.
IMHO, nodejs should add an fs.copy function (just like what fs-extra already does) which is implemented using the OS native file copying syscall. It should have an optional option parameter that allows specifying the copy should use CoW (if available), just like how cp --reflink=auto from coreutils works on Linux.
Note that this would be particularly benefit for cases where files are copied often - particularly big files. I'm thinking that this improvement would substantially benefit package managers (npm, yarn, etc).