const winston = require('winston');
require('winston-daily-rotate-file');

var transport = new (winston.transports.DailyRotateFile)({
  filename: 'application-%DATE%.log',
  datePattern: 'YYYY-MM-DD-HH',
  zippedArchive: true,
  maxSize: '20m',
  maxFiles: '14d',
  format: winston.format.combine(
    winston.format.timestamp(),
    winston.format.json()
  )
});

transport.on('rotate', function(oldFilename, newFilename) {
  // do something fun
});

var logger = winston.createLogger({
  transports: [
    transport
  ]
});

logger.info('Hello World!');