[Fix] in WSH, Object.getPrototypeOf([].values()) is falsy

Closes es-shims/es5-shim#476.
paulmillr · Apr 28, 2021 · 023fde8 · 023fde8
1 parent d4be3e6
commit 023fde8
Showing 1 changed file with 4 additions and 1 deletion.
diff --git a/es6-shim.js b/es6-shim.js
@@ -1268,7 +1268,10 @@
   // Chrome defines keys/values/entries on Array, but doesn't give us
   // any way to identify its iterator.  So add our own shimmed field.
   if (Object.getPrototypeOf) {
-    addIterator(Object.getPrototypeOf([].values()));
+    var ChromeArrayIterator = Object.getPrototypeOf([].values());
+    if (ChromeArrayIterator) { // in WSH, this is `undefined`
+      addIterator(ChromeArrayIterator);
+    }
   }
 
   // note: this is positioned here because it relies on Array#entries