ES6 target uses Object.assign for emitting spread

sandersn · sandersn · commit 5282a8d0f5c1 · 2017-01-30T08:55:32.000-08:00
Also omits the __assign helper
diff --git a/src/compiler/transformers/esnext.ts b/src/compiler/transformers/esnext.ts
@@ -402,6 +402,11 @@ namespace ts {
     };
 
     export function createAssignHelper(context: TransformationContext, attributesSegments: Expression[]) {
+        if (context.getCompilerOptions().target === ScriptTarget.ES2015) {
+            return createCall(createPropertyAccess(createIdentifier("Object"), "assign"),
+                              /*typeArguments*/ undefined,
+                              attributesSegments);
+        }
         context.requestEmitHelper(assignHelper);
         return createCall(
             getHelperName("__assign"),
