Customized Winston logger with chalk-colored output

customized-winston-logger.js

var winston = require("winston"),
    dateformat = require("dateformat"),
    chalk = require("chalk");

module.exports = new (winston.Logger)({
  transports: [
    new (winston.transports.Console)({
        timestamp: function () {
          return dateformat(Date.now(), "yyyy-mm-dd HH:MM:ss.l");
        },
        formatter: function (options) {
          var message = "";

          if (options.message !== undefined) {
            message = options.message;
          }

          var meta = "";

          if (options.meta && Object.keys(options.meta).length) {
            meta = "\n\t" + JSON.stringify(options.meta);
          }

          var level = options.level.toUpperCase();

          switch (level) {
            case "INFO":
              level = chalk.cyan(level);
              break;

            case "WARN":
              level = chalk.yellow(level);
              break;

            case "ERROR":
              level = chalk.red(level);
              break;

            default:
              break;
          }

          var output = [
            "[" + options.timestamp() + "][" + level + "]",
            message,
            meta
          ];

          return output.join(" ");
        }
    })
  ]
});

Thanks!