Bump to v4.13.0.

_root.js

@@ -1,41 +1,15 @@
-import checkGlobal from './_checkGlobal';
-
-/** Used to determine if values are of the language type `Object`. */
-var objectTypes = {
-  'function': true,
-  'object': true
-};
-
-/** Detect free variable `exports`. */
-var freeExports = (objectTypes[typeof exports] && exports && !exports.nodeType)
-  ? exports
-  : undefined;
-
-/** Detect free variable `module`. */
-var freeModule = (objectTypes[typeof module] && module && !module.nodeType)
-  ? module
-  : undefined;
+import checkGlobal from './_checkGlobal.js';
 
 /** Detect free variable `global` from Node.js. */
-var freeGlobal = checkGlobal(freeExports && freeModule && typeof global == 'object' && global);
+var freeGlobal = checkGlobal(typeof global == 'object' && global);
 
 /** Detect free variable `self`. */
-var freeSelf = checkGlobal(objectTypes[typeof self] && self);
-
-/** Detect free variable `window`. */
-var freeWindow = checkGlobal(objectTypes[typeof window] && window);
+var freeSelf = checkGlobal(typeof self == 'object' && self);
 
 /** Detect `this` as the global object. */
-var thisGlobal = checkGlobal(objectTypes[typeof this] && this);
+var thisGlobal = checkGlobal(typeof this == 'object' && this);
 
-/**
- * Used as a reference to the global object.
- *
- * The `this` value is used if it's the global object to avoid Greasemonkey's
- * restricted `window` object, otherwise the `window` object is used.
- */
-var root = freeGlobal ||
-  ((freeWindow !== (thisGlobal && thisGlobal.window)) && freeWindow) ||
-    freeSelf || thisGlobal || Function('return this')();
+/** Used as a reference to the global object. */
+var root = freeGlobal || freeSelf || thisGlobal || Function('return this')();
 
 export default root;