fixup! fix(angular-loader): do not depend on "closure" globals that may not be available

Author: gkalpak

src/loader.prefix

@@ -5,11 +5,16 @@
  */
 'use strict';
 (function() {
+    // NOTE:
+    // These functions are copied here from `src/Angular.js`, because they are needed inside the
+    // `angular-loader.js` closure and need to be available before the main `angular.js` script has
+    // been loaded.
     function isFunction(value) {return typeof value === 'function';}
     function isDefined(value) {return typeof value !== 'undefined';}
     function isNumber(value) {return typeof value === 'number';}
     function isObject(value) {return value !== null && typeof value === 'object';}
     function isScope(obj) {return obj && obj.$evalAsync && obj.$watch;}
+    function isUndefined(value) {return typeof value === 'undefined';}
     function isWindow(obj) {return obj && obj.window === obj;}
     function sliceArgs(args, startIndex) {return Array.prototype.slice.call(args, startIndex || 0);}
     function toJsonReplacer(key, value) {

src/stringify.js

@@ -2,21 +2,16 @@
 
 /* exported toDebugString */
 
-// This file is also included in `angular-loader`, so `copy()` might not always be available in the
-// closure. In such cases, it is lazily retrieved as `angular.copy()` when needed.
-var copyFn;
-
 function serializeObject(obj, maxDepth) {
   var seen = [];
 
   // There is no direct way to stringify object until reaching a specific depth
   // and a very deep object can cause a performance issue, so we copy the object
   // based on this specific depth and then stringify it.
   if (isValidObjectMaxDepth(maxDepth)) {
-    if (!copyFn) {
-      copyFn = copy || angular.copy;
-    }
-    obj = copyFn(obj, null, maxDepth);
+    // This file is also included in `angular-loader`, so `copy()` might not always be available in
+    // the closure. Therefore, it is lazily retrieved as `angular.copy()` when needed.
+    obj = angular.copy(obj, null, maxDepth);
   }
   return JSON.stringify(obj, function(key, val) {
     val = toJsonReplacer(key, val);