Node.js: How to know real filename which matches an internal filename in different case on Windows

My Node.js program wants to read the contents of the file "test.txt" on a Windows machine. It checks with fs.existsSync() that the file exists and reads its content. But now I want the program instead to give an error or warning if the name of the file on disk is actually "TEST.txt" or any other name which differs in case from the name my program is looking for, e.g. "test.txt".

Is there a straightforward way to figure out that even though existsSync() tells me a file exists, the file on disk has a name which differs in case from the file-name I am using to look for it?

via Panu Logic