v4.4.3

CHANGELOG.md

@@ -13,6 +13,14 @@ _Note: Gaps between patch versions are faulty/broken releases._
 
 See [CHANGELOG - 6to5](CHANGELOG-6to5.md) for the pre-4.0.0 version changelog.
 
+## 4.4.3
+
+ * **Bug Fix**
+  * Fix `for...of` iterator break returns being duplicated.
+  * Only call `return` on the iterator if it exists.
+ * **Internal**
+  * Rename `selfContained` transformer to `runtime`.
+
 ## 4.4.2
 
  * **New Feature**

lib/babel/transformation/file.js

@@ -176,7 +176,7 @@ File.prototype.normalizeOptions = function (opts) {
   }
 
   if (opts.externalHelpers) {
-    this.set("runtimeIdentifier", t.identifier("babelHelpers"));
+    this.set("helpersNamespace", t.identifier("babelHelpers"));
   }
 
   opts.blacklist = transform._ensureTransformerNames("blacklist", opts.blacklist);
@@ -333,7 +333,7 @@ File.prototype.addHelper = function (name) {
   var declar = program._declarations && program._declarations[name];
   if (declar) return declar.id;
 
-  var runtime = this.get("runtimeIdentifier");
+  var runtime = this.get("helpersNamespace");
   if (runtime) {
     name = t.identifier(t.toIdentifier(name));
     return t.memberExpression(runtime, name);

lib/babel/transformation/transformers/deprecated.json

@@ -1 +1,3 @@
-{}
+{
+  "selfContained": "runtime"
+}

lib/babel/transformation/transformers/es6/for-of.js

@@ -53,8 +53,9 @@ var breakVisitor = {
       var ret = t.expressionStatement(
         t.callExpression(t.memberExpression(state.iteratorKey, t.identifier("return")), [])
       );
-      if (state.wrapReturn) ret = state.wrapReturn(ret);
+      ret = state.wrapReturn(ret);
 
+      this.skip();
       return [ret, node];
     }
   }
@@ -99,7 +100,13 @@ var loose = function (node, parent, scope, file) {
   scope.traverse(node, breakVisitor, {
     iteratorKey: iteratorKey,
     wrapReturn:  function (node) {
-      return t.ifStatement(t.unaryExpression("!", isArrayKey, true), node);
+      return t.ifStatement(
+        t.logicalExpression(
+          "&&",
+          t.unaryExpression("!", isArrayKey, true),
+          t.memberExpression(iteratorKey, t.identifier("return")
+        )
+      ), node);
     },
     label:       t.isLabeledStatement(parent) && parent.label.name
   });
@@ -145,6 +152,9 @@ var spec = function (node, parent, scope, file) {
 
   scope.traverse(node, breakVisitor, {
     iteratorKey: iteratorKey,
+    wrapReturn:  function (node) {
+      return t.ifStatement(t.memberExpression(iteratorKey, t.identifier("return")), node);
+    },
     label:       t.isLabeledStatement(parent) && parent.label.name
   });
 

lib/babel/transformation/transformers/index.js

@@ -79,7 +79,7 @@ module.exports = {
   // needs to be after `regenerator` due to needing `regeneratorRuntime` references
   // needs to be after `es6.forOf` due to needing `Symbol.iterator` references
   // needs to be before `es6.modules` due to dynamic imports
-  selfContained:                           require("./other/self-contained"),
+  runtime:                                require("./other/runtime"),
 
   // needs to be before `_blockHoist` due to function hoisting etc
   "es6.modules":                           require("./es6/modules"),

lib/babel/transformation/transformers/other/runtime.js

@@ -82,7 +82,7 @@ exports.Program = function (node, parent, scope, file) {
 };
 
 exports.pre = function (file) {
-  file.setDynamic("runtimeIdentifier", function () {
+  file.setDynamic("helpersNamespace", function () {
     return file.addImport("babel-runtime/helpers", "babelHelpers");
   });
 

package.json

@@ -1,7 +1,7 @@
 {
   "name": "babel",
   "description": "Turn ES6 code into readable vanilla ES5 with source maps",
-  "version": "4.4.2",
+  "version": "4.4.3",
   "author": "Sebastian McKenzie <sebmck@gmail.com>",
   "homepage": "https://babeljs.io/",
   "repository": "babel/babel",

packages/babel-runtime/package.json

@@ -1,7 +1,7 @@
 {
   "name": "babel-runtime",
   "description": "babel selfContained runtime",
-  "version": "4.4.1",
+  "version": "4.4.2",
   "repository": "babel/babel",
   "author": "Sebastian McKenzie <sebmck@gmail.com>"
 }

test/fixtures/transformation/es6-for-of-loose/break/expected.js

@@ -17,7 +17,7 @@ foo: for (var _iterator = foo(), _isArray = Array.isArray(_iterator), _i = 0, _i
   var x = _ref;
 
   while (true) {
-    if (!_isArray) _iterator["return"]();
+    if (!_isArray && _iterator["return"]) _iterator["return"]();
 
     break foo;
   }
@@ -55,7 +55,7 @@ foo: for (var _iterator3 = foo(), _isArray3 = Array.isArray(_iterator3), _i3 = 0
   }
 
   var x = _ref3;
-  if (!_isArray3) _iterator3["return"]();
+  if (!_isArray3 && _iterator3["return"]) _iterator3["return"]();
 
   break foo;
 }
@@ -75,7 +75,7 @@ for (var _iterator4 = foo(), _isArray4 = Array.isArray(_iterator4), _i4 = 0, _it
   }
 
   var x = _ref4;
-  if (!_isArray4) _iterator4["return"]();
+  if (!_isArray4 && _iterator4["return"]) _iterator4["return"]();
 
   break;
 }

test/fixtures/transformation/es6-for-of/break/expected.js

@@ -6,7 +6,7 @@ foo: for (var _iterator = foo()[Symbol.iterator](), _step; !(_step = _iterator.n
   var x = _step.value;
 
   while (true) {
-    _iterator["return"]();
+    if (_iterator["return"]) _iterator["return"]();
 
     break foo;
   }
@@ -22,8 +22,7 @@ foo: for (var _iterator2 = foo()[Symbol.iterator](), _step2; !(_step2 = _iterato
 
 foo: for (var _iterator3 = foo()[Symbol.iterator](), _step3; !(_step3 = _iterator3.next()).done;) {
   var x = _step3.value;
-
-  _iterator3["return"]();
+  if (_iterator3["return"]) _iterator3["return"]();
 
   break foo;
 }
@@ -32,8 +31,7 @@ foo: for (var _iterator3 = foo()[Symbol.iterator](), _step3; !(_step3 = _iterato
 
 for (var _iterator4 = foo()[Symbol.iterator](), _step4; !(_step4 = _iterator4.next()).done;) {
   var x = _step4.value;
-
-  _iterator4["return"]();
+  if (_iterator4["return"]) _iterator4["return"]();
 
   break;
 }

test/fixtures/transformation/runtime/options.json

@@ -0,0 +1,4 @@
+{
+  "optional": ["runtime"],
+  "experimental": true
+}

test/fixtures/transformation/self-contained/options.json

@@ -1,4 +0,0 @@
-{
-  "optional": ["selfContained"],
-  "experimental": true
-}