Replacement for fs.existsSync(), which is being deprecated:
"fs.exists() is an anachronism and exists only for historical reasons. There should almost never be a reason to use it in your own code.
In particular, checking if a file exists before opening it is an anti-pattern that leaves you vulnerable to race conditions: another process may remove the file between the calls to fs.exists() and fs.open(). Just open the file and handle the error when it's not there."
exists-sync will recursively follow symlinks to verify the target file exists, rather than giving a false positive on a symlink whose target has been removed.