logger.js

function makeLogger() {
  return new winston.Logger({
    level: 'info',
    transports: [
      new (winston.transports.Console)(),
      new (winston.transports.File)({ filename: 'somefile.log' })
    ]
  });
}

module.exports = makeLogger;

main.js

// Require and create a a new logger
var logger = require('./logger')();