How to use the log.INFO function in log

mkdir(dir, 0755, function(err){
      if (err) throw err;
      // master log
      var stream = fs.createWriteStream(dir + '/master.log', { flags: 'a' });
      var log = master.log = new Log(level || Log.INFO, stream);

      // master events
      master.on('start', function(){
        log.info('master started');
      });

      // master is shutting down
      master.on('closing', function(){
        log.warning('shutting down master');
      });

      // master has closed and performed cleanup
      master.on('close', function(){
        log.info('shutdown complete');
      });

var Log = require('log'),
    colors = require('colors');

// Duck Punch the logger
// "... if it walks like a duck and talks like a duck, it's a duck, right? So if
// this duck is not giving you the noise that you want, you've got to just
// punch that duck until it returns what you expect."

Log.SUCCESS = Log.INFO;

Log.prototype.success = function () {
    arguments[0] = ' ✔ '.green + arguments[0];
    this.log('SUCCESS', arguments);
};

Log.prototype.info = function () {
    arguments[0] = '    ➔ '.black + arguments[0];
    this.log('INFO', arguments);
};

Log.prototype.error = function () {
    arguments[0] = '   ✘ '.red + arguments[0];
    this.log('ERROR', arguments);
    throw new Error(arguments[arguments.length - 1]);
};

var yaml = require('js-yaml') // register .yaml require handler
  , fs   = require('fs')
  , Log  = require('log')
  , log  = new Log(Log.INFO);

var extend = function(dest, from) {
  var props = Object.getOwnPropertyNames(from);
  props.forEach(function(name) {
    if (name in dest && typeof dest[name] === 'object') {
      extend(dest[name], from[name]);
    }
     else {
      var destination = Object.getOwnPropertyDescriptor(from, name);
      Object.defineProperty(dest, name, destination);
    }
  });
};

/**
* Removes properties of the 'dest' object where the 'from' objects

it('should not use time and timeEnd when the level is higher than DEBUG', () => {
    log.level = Log.INFO
    log.time('test')
    log.timeEnd('test')

    expect(consoleSpy.time).not.toHaveBeenCalled()
    expect(consoleSpy.timeEnd).not.toHaveBeenCalled()
  })

}
}

log.timeEnd = function (label) {
  if (this.level >= Log.DEBUG) {
    console.timeEnd(label)
  }
}

log.EMERGENCY = Log.EMERGENCY
log.ALERT = Log.ALERT
log.CRITICAL = Log.CRITICAL
log.ERROR = Log.ERROR
log.WARNING = Log.WARNING
log.NOTICE = Log.NOTICE
log.INFO = Log.INFO
log.DEBUG = Log.DEBUG

module.exports = log