* code style

Sortable.js

@@ -4,7 +4,6 @@
  * @license MIT
  */
 
-
 (function (factory) {
 	"use strict";
 
@@ -24,10 +23,10 @@
 })(function () {
 	"use strict";
 
-	if (typeof window == "undefined" || typeof window.document == "undefined") {
+	if (typeof window == "undefined" || !window.document) {
-		return function() {
+		return function SortableError() {
 			throw new Error("Sortable.js requires a window with a document");
-		}
+		};
 	}
 
 	var dragEl,

knockout-sortable.js

@@ -1,3 +1,5 @@
+/*global ko*/
+
 (function (factory) {
 	"use strict";
 	//get ko ref via global or require
@@ -28,10 +30,14 @@
 	else if (typeof define === 'function' && define.amd) {
 		//we may have a reference to only 1, or none
 		if (koRef !== undefined && sortableRef === undefined) {
-        define(['./Sortable'], function(amdSortableRef){ factory(koRef, amdSortableRef); });
+			define(['./Sortable'], function (amdSortableRef) {
+				factory(koRef, amdSortableRef);
+			});
 		}
 		else if (koRef === undefined && sortableRef !== undefined) {
-        define(['knockout'], function(amdKnockout){ factory(amdKnockout, sortableRef); });
+			define(['knockout'], function (amdKnockout) {
+				factory(amdKnockout, sortableRef);
+			});
 		}
 		else if (koRef === undefined && sortableRef === undefined) {
 			define(['knockout', './Sortable'], factory);