fix client side detection

CHANGELOG.txt

@@ -1,3 +1,7 @@
+# v0.1.3
+
+- Fixes issue where library erroneously detected client-side environment when running on Node.js.
+
 # v0.1.0
 
 - Will not attempt to deep-merge DOM nodes if provided as part of a nested source object. This previously resulted in an infinite loop due to circular references.

package.json

@@ -1,6 +1,6 @@
 {
   "name": "helpful-merge",
-  "version": "0.1.2",
+  "version": "0.1.3",
   "description": "A highly-configurable merge implementation with intelligent error handling for validating consumer-provided input against configuration interfaces.",
   "author": "KunkaLabs Limited",
   "private": false,

src/merge.ts

@@ -7,7 +7,7 @@ import IMerge           from './Interfaces/IMerge';
 import * as Messages    from './Messages';
 
 function merge<T extends any>(target: T, source: any, options: (IConfig|true) = null): T {
-    const isClientSide = typeof window !== undefined;
+    const isClientSide = typeof window !== 'undefined';
 
     let sourceKeys: string[] = [];
     let config: Config;