better Symbol polyfill existence check because the one es6-symbol uses isn't reliable

2014-11-07 12:27:57 +11:00 · 2014-11-07 12:27:57 +11:00 · 12f68b05c3
commit 12f68b05c3
parent 62fe128132
1 changed files with 4 additions and 1 deletions
--- a/lib/6to5/polyfill.js
+++ b/lib/6to5/polyfill.js
@ -1,3 +1,6 @@
-require("es6-symbol/implement");
+if (typeof Symbol === "undefined") {
+  require("es6-symbol/implement");
+}
+
 require("es6-shim");
 require("regenerator/runtime");