v4.6.3

package.json

@@ -1,7 +1,7 @@
 {
   "name": "babel",
   "description": "Turn ES6 code into readable vanilla ES5 with source maps",
-  "version": "4.6.2",
+  "version": "4.6.3",
   "author": "Sebastian McKenzie <sebmck@gmail.com>",
   "homepage": "https://babeljs.io/",
   "repository": "babel/babel",

src/babel/transformation/transformers/es6/parameters.rest.js

@@ -29,7 +29,6 @@ var memberExpressionOptimisationVisitor = {
       var prop = parent.property;
       if (isNumber(prop.value) || t.isUnaryExpression(prop) || t.isBinaryExpression(prop)) {
         state.candidates.push(this);
-        state.canOptimise = true;
         return;
       }
     }
@@ -81,7 +80,7 @@ exports.Function = function (node, parent, scope) {
 
   var state = {
     outerBinding: scope.getBindingIdentifier(rest.name),
-    canOptimise:  false,
+    canOptimise:  true,
     candidates:   [],
     method:       node,
     name:         rest.name
@@ -90,7 +89,7 @@ exports.Function = function (node, parent, scope) {
   scope.traverse(node, memberExpressionOptimisationVisitor, state);
 
   // we only have shorthands and there's no other references
-  if (state.canOptimise) {
+  if (state.canOptimise && state.candidates.length) {
     for (var i = 0; i < state.candidates.length; i++) {
       var candidate = state.candidates[i];
       candidate.node = argsId;

test/fixtures/transformation/es6-parameters.rest/deopt/actual.js

@@ -8,17 +8,23 @@ var y = function (foo, ...bar) {
   };
 };
 
+var b = function (x, y, ...args) {
+  console.log(args[0]);
+  args.pop();
+  console.log(args[1]);
+};
+
 var z = function (foo, ...bar) {
-    var x = function () {
-        bar[1] = 5;
-    };
+  var x = function () {
+    bar[1] = 5;
+  };
 };
 
 var a = function (foo, ...bar) {
-    return bar.join(',');
+  return bar.join(',');
 };
 
 var b = function (foo, ...bar) {
-    var join = "join";
-    return bar[join];
+  var join = "join";
+  return bar[join];
 };

test/fixtures/transformation/es6-parameters.rest/deopt/expected.js

@@ -1,47 +1,56 @@
 "use strict";
 
 var x = function x(foo) {
-    for (var _len = arguments.length, bar = Array(_len > 1 ? _len - 1 : 0), _key = 1; _key < _len; _key++) {
-        bar[_key - 1] = arguments[_key];
-    }
+  for (var _len = arguments.length, bar = Array(_len > 1 ? _len - 1 : 0), _key = 1; _key < _len; _key++) {
+    bar[_key - 1] = arguments[_key];
+  }
 
-    console.log(bar);
+  console.log(bar);
 };
 
 var y = function y(foo) {
-    for (var _len = arguments.length, bar = Array(_len > 1 ? _len - 1 : 0), _key = 1; _key < _len; _key++) {
-        bar[_key - 1] = arguments[_key];
-    }
+  for (var _len = arguments.length, bar = Array(_len > 1 ? _len - 1 : 0), _key = 1; _key < _len; _key++) {
+    bar[_key - 1] = arguments[_key];
+  }
 
-    var x = function z(bar) {
-        bar[1] = 5;
-    };
+  var x = function z(bar) {
+    bar[1] = 5;
+  };
+};
+
+var b = function b(x, y) {
+  for (var _len = arguments.length, args = Array(_len > 2 ? _len - 2 : 0), _key = 2; _key < _len; _key++) {
+    args[_key - 2] = arguments[_key];
+  }
+
+  console.log(args[0]);
+  args.pop();
+  console.log(args[1]);
 };
 
 var z = function z(foo) {
-    for (var _len = arguments.length, bar = Array(_len > 1 ? _len - 1 : 0), _key = 1; _key < _len; _key++) {
-        bar[_key - 1] = arguments[_key];
-    }
+  for (var _len = arguments.length, bar = Array(_len > 1 ? _len - 1 : 0), _key = 1; _key < _len; _key++) {
+    bar[_key - 1] = arguments[_key];
+  }
 
-    var x = function x() {
-        bar[1] = 5;
-    };
+  var x = function x() {
+    bar[1] = 5;
+  };
 };
 
 var a = function a(foo) {
-    for (var _len = arguments.length, bar = Array(_len > 1 ? _len - 1 : 0), _key = 1; _key < _len; _key++) {
-        bar[_key - 1] = arguments[_key];
-    }
+  for (var _len = arguments.length, bar = Array(_len > 1 ? _len - 1 : 0), _key = 1; _key < _len; _key++) {
+    bar[_key - 1] = arguments[_key];
+  }
 
-    return bar.join(",");
+  return bar.join(",");
 };
 
 var b = function b(foo) {
-    for (var _len = arguments.length, bar = Array(_len > 1 ? _len - 1 : 0), _key = 1; _key < _len; _key++) {
-        bar[_key - 1] = arguments[_key];
-    }
+  for (var _len = arguments.length, bar = Array(_len > 1 ? _len - 1 : 0), _key = 1; _key < _len; _key++) {
+    bar[_key - 1] = arguments[_key];
+  }
 
-    var join = "join";
-    return bar[join];
+  var join = "join";
+  return bar[join];
 };
-