Logger boilerplate, where does it go?

emitter.js

var Emitter = require('events').EventEmitter

function task(options, cb) {
  
  var emitter = new Emitter()
  emitter.emit('log', 'Starting stuff', 'info')
  emitter.emit('log', 'Fine grained detail about stuff', 'debug')
  cb(null)
  return emitter
  
}


//
// Usage:
//

task({ .. options .. }, function (err) {
  // Done
  })
  .on('log', function (msg, level) {
    // Sanitise level to make sure it is
    // in 'debug' 'info' 'warn' or 'error'
    pliers.logger[level](msg)
  })

logger.js

var defaultLogger =
  { debug: console.log
  , info: console.log
  , warn: console.log
  , error: console.log
  }


function task(options, cb) {
  
  var logger = options.logger || defaultLogger
  
  logger.info('Doing some stuff')
  
  // do some stuff
  logger.debug('Granular detail about the stuff')
  
  logger.info('Done doing stuff')
  
  cb(null)
  
}


//
// Usage:
//

task({ logger: pliers.logger, .. options .. }, function (err) {
  
  // done
  
})