   @param topics [String] topic names
   @param data [Array] any kind of data(s)
   ###
-  _publisher: (type, topics, data) ->
+  _publisher: (type, topics, data) =>
 
     # if somthing go wrong
     unless _.isString(topics)

  @param level [String] verbose level name
  @return [Integer] verbose level
  ###
  _parseVerboseLevel: (level) ->
    # default level is ERROR
    unless level?
      return ERROR

  
  @return [Object] *this* for chaining
  ###
  publish: (topics, data...) =>
    @_publisher 'sync', topics, data
    this
    
