Create logfile only if needed

[alessandrofrancesconi]

I setup my daily rolling logfile at app startup, this way:

var fileLog = SimpleNodeLogger.createRollingFileLogger({
        logDirectory: path.dirname(process.execPath) + '/logs',
        fileNamePattern: '<DATE>.log',
        dateFormat: 'YYYY-MM-DD'
});
fileLog.setLevel('warn');

This way my program creates 1 logfile each day, even if nothing is logged. So I can end up with many empty logfiles.
Is it possible to tell SimpleNodeLogger to create the file only when I actually need to log something?