function
Stop watching for changes on filename. If listener is specified, only that particular listener is removed. Otherwise, all listeners are removed, effectively stopping watching of filename.
Calling fs.unwatchFile() with a filename that is not being watched is a no-op, not an error.
Using watch is more efficient than fs.watchFile() and fs.unwatchFile(). fs.watch() should be used instead of fs.watchFile() and fs.unwatchFile() when possible.
Optional, a listener previously attached using fs.watchFile()
Stop watching for changes on filename. If listener is specified, only that particular listener is removed. Otherwise, all listeners are removed, effectively stopping watching of filename.
Calling fs.unwatchFile() with a filename that is not being watched is a no-op, not an error.
Using watch is more efficient than fs.watchFile() and fs.unwatchFile(). fs.watch() should be used instead of fs.watchFile() and fs.unwatchFile() when possible.
Optional, a listener previously attached using fs.watchFile()
