Winston Transports setup for Daily Rotation and separate files per log level

logger.js

'use strict';

var winston = require('winston');
var DailyRotateFile = require('winston-daily-rotate-file');
winston.emitErrs = true;

var logger = new winston.Logger( {
  transports:  [
    new winston.transports.Console({
      level: 'debug',
      handleExceptions: true,
      json: true,
      colorize: true,
      humanReadableUnhandledException: true
    }),
    new DailyRotateFile({
      name: 'log.info',
      level: 'info',
      datePattern: 'yyyy-MM-dd',
      filename: './logs/info.log',
      handleExceptions: false,
      json: true,
      maxsize: 5242880,
      maxFiles: 10,
      colorize: true
    }),
    new DailyRotateFile({
      name: 'log.warn',
      level: 'warn',
      filename: './logs/warn.log',
      handleExceptions: false,
      json: true,
      maxsize: 5242880,
      maxFiles: 10,
      colorize: true,
      datePattern: 'yyyy-MM-dd'
    }),
    new DailyRotateFile({
      name: 'log.error',
      level: 'error',
      filename: './logs/error.log',
      handleExceptions: true,
      humanReadableUnhandledException: true,
      json: true,
      maxsize: 5242880,
      maxFiles: 10,
      colorize: true,
      datePattern: 'yyyy-MM-dd'
    })
  ],
  exitOnError: false
});

module.exports = logger;
module.exports.stream = {
  write: function (message) {
    logger.info(message);
  }
};