Add stricter comparison between global and window objects.

Supports js-dom and faked DOM environments during Node testing. See #31 for more context.

Author: jplhomer

src/custom-extend.ts

@@ -3,7 +3,7 @@
 // Allows 'inherited' hook
 
 let globalObj;
-if (typeof window === 'undefined') {
+if (typeof window === 'undefined' || window != (global as any)) {
   globalObj = global;
 } else {
   globalObj = window;

src/util/extend.ts

@@ -2,7 +2,7 @@
 // use for non-typescript extends
 
 let globalObj;
-if (typeof window === 'undefined') {
+if (typeof window === 'undefined' || window !== (global as any)) {
   globalObj = global;
 } else {
   globalObj = window;