Issue when writing EOL in stream mode about node-byline HOT 5 OPEN

var writeStream = fs.createWriteStream(tmpFilePath, {flags: 'w', encoding: 'utf-8'});

writeStream.write(text + os.EOL);

    var stream = byline(fs.createReadStream(self._options.trainFile, { flags: 'r', encoding: 'utf8'}));

stream.on('data', function(text) { /// read line by line
            text=text.toLowerCase()
            .replace(/^/gm, '__label__')
            .replace(/'/g, " ' ")
            .replace(/"/g, '')
            .replace(/\./g, ' \. ')
            .replace(/,/g, ' \, ')
            .replace(/\(/g, ' ( ')
            .replace(/\)/g, ' ) ')
            .replace(/!/g, ' ! ')
            .replace(/\?/g, ' ! ')
            .replace(/;/g, ' ')
            .replace(/:/g, ' ');
            writeStream.write(text  + '\n');
        });

// ...

stream.on('data', function(text) { /// read line by line
  console.log(text)
});