foo.js

var Tasker = exports.Tasker = function _Tasker(options) {
  this.options = options;
  this.state = {};
}; 

Tasker.prototype = new EventEmitter2();

Tasker.prototype.destruct = destructTasker;
Tasker.prototype.addTask = tasks.addTask;
Tasker.prototype.removeTask = tasks.removeTask;
Tasker.prototype.getTasksRunning = scheduler.getTasksRunning;
Tasker.prototype.getTasksQueued = queue.getTasksQueued;  

var create = exports.create = function _create(options) {
  var tasker = new Tasker(options);
};