Improve __assign emit:remove getOwnPropertySymbols

sandersn · sandersn · commit 8d24712d8563 · 2016-11-16T10:14:16.000-08:00
Since __assign defaults to Object.assign if present, our own helper will
never be used in ES6 and higher, and `getOwnPropertySymbols` is not
needed in ES5 and below because symbols don't exist there.
diff --git a/src/compiler/emitter.ts b/src/compiler/emitter.ts
@@ -38,9 +38,6 @@ var __assign = (this && this.__assign) || Object.assign || function(t) {
         s = arguments[i];
         for (var p in s) if (Object.prototype.hasOwnProperty.call(s, p))
             t[p] = s[p];
-        if (typeof Object.getOwnPropertySymbols === "function")
-            for (var i = 0, p = Object.getOwnPropertySymbols(s); i < p.length; i++)
-                t[p[i]] = s[p[i]];
     }
     return t;
 };`;
