Merge pull request #5573 from ahocevar/safe-eval-global

Determine ol.global in a way that works in more environments

externs/closure-compiler.js

@@ -15,3 +15,5 @@
  * @see http://www.w3.org/TR/pointerevents/#the-touch-action-css-property
  */
 CSSProperties.prototype.touchAction;
+
+var global;

src/ol/ol.js

@@ -275,4 +275,13 @@ ol.inherits = function(childCtor, parentCtor) {
 ol.nullFunction = function() {};
 
 
-ol.global = Function('return this')();
+/**
+ * @see https://github.com/tc39/proposal-global
+ */
+if (typeof window !== 'undefined') {
+  ol.global = window;
+} else if (typeof global !== 'undefined') {
+  ol.global = global;
+} else if (typeof self !== 'undefined') {
+  ol.global = self;
+}