Merge pull request #39 from naturalatlas/bugfix-serverside-window

Bugfix: fixed server-side rendering (window undefined)

Author: Claudéric Demers

src/SortableContainer/index.js

@@ -24,7 +24,7 @@ export default function SortableContainer(WrappedComponent, config = {withRef: f
 			pressDelay: 0,
 			useWindowAsScrollContainer: false,
 			hideSortableGhost: true,
-			contentWindow: window,
+			contentWindow: typeof window !== 'undefined' ? window : null,
 			lockToContainerEdges: false,
 			lockOffset: '50%'
 		};

src/utils.js

@@ -16,6 +16,7 @@ export const events = {
 };
 
 export const vendorPrefix = (function () {
+    if (typeof window === 'undefined') return ''; // server environment
     let styles = window.getComputedStyle(document.documentElement, '');
     let pre = (Array.prototype.slice
         .call(styles)