code: function(module, exports, __webpack_require__) {
  
  	'use strict';
  
  	var queue = __webpack_require__(9);
  
  	module.exports = function (worker, concurrency) {
  	    return queue(function (items, cb) {
  	        worker(items[0], cb);
  	    }, concurrency, 1);
  	};
  
  
  /***/ }
docs: /* 3