Add a Symbol polyfill, using core-js, to allow using for...of loops

https://github.com/zloirock/core-js#ecmascript-symbol
mozilla · Sep 16, 2018 · f027494 · f027494
1 parent 40934fb
commit f027494
Showing 1 changed file with 8 additions and 0 deletions.
diff --git a/src/shared/compatibility.js b/src/shared/compatibility.js
@@ -183,6 +183,14 @@ const hasDOM = typeof window === 'object' && typeof document === 'object';
   String.fromCodePoint = require('core-js/fn/string/from-code-point');
 })();
 
+// Support: IE
+(function checkSymbol() {
+  if (globalScope.Symbol) {
+    return;
+  }
+  require('core-js/es6/symbol');
+})();
+
 } // End of !PDFJSDev.test('CHROME')
 
 // Provides support for Object.values in legacy browsers.