function getFilesizeInBytes(fileName) {
    try {
        var stats = fs.statSync(fileName);
        return stats.size || 0;
    } catch (ex) {
        console.log(ex);
        return 0;
    }
}
Gets the file size in bytes.
@param   {string} fileName The name of the file to get the size
@returns {Number} the file size in bytes