v1.13.1

CHANGELOG.md

@@ -1,7 +1,11 @@
+# 1.13.1
+
+ * Fix constructor spread optimisation. Thanks [@zloirock](https://github.com/zloirock).
+
 # 1.13.0
 
  * Put experimental ES7 features behind a flag `--experimental` and `experimental` option.
- * Constructor speed performance increase. Thanks [@RReverser](https://github.com/RReverser).
+ * Constructor spread performance increase. Thanks [@RReverser](https://github.com/RReverser).
  * Use `self` instead of `window` in the optional 6to5 runtime. Thanks [@RReverser](https://github.com/RReverser).
 
 # 1.12.26

lib/6to5/templates/apply-constructor.js

@@ -1,5 +1,5 @@
 (function (Constructor, args) {
   var instance = Object.create(Constructor.prototype);
-  Constructor.apply(instance, args);
-  return instance;
+  var result = Constructor.apply(instance, args);
+  return result != null && (typeof result == "object" || typeof result == "function") ? result : instance;
 });

package.json

@@ -1,7 +1,7 @@
 {
   "name": "6to5",
   "description": "Turn ES6 code into readable vanilla ES5 with source maps",
-  "version": "1.13.0",
+  "version": "1.13.1",
   "author": "Sebastian McKenzie <sebmck@gmail.com>",
   "homepage": "https://github.com/6to5/6to5",
   "repository": {

test/fixtures/transformation/spread/new-expression/expected.js

@@ -3,9 +3,9 @@
 var _applyConstructor = function (Constructor, args) {
   var instance = Object.create(Constructor.prototype);
 
-  Constructor.apply(instance, args);
+  var result = Constructor.apply(instance, args);
 
-  return instance;
+  return result != null && (typeof result == "object" || typeof result == "function") ? result : instance;
 };
 
 _applyConstructor(Numbers, Array.from(nums));