add descriptor falsy check to defaults helper - #739

lib/6to5/transformation/templates/defaults.js

@@ -3,7 +3,7 @@
   for (var i = 0; i < keys.length; i++) {
     var key = keys[i];
     var value = Object.getOwnPropertyDescriptor(defaults, key);
-    if (value.configurable && obj[key] === undefined) {
+    if (value && value.configurable && obj[key] === undefined) {
       Object.defineProperty(obj, key, value);
     }
   }

test/fixtures/transformation/es6-modules-amd/exports-from/expected.js

@@ -3,7 +3,7 @@ define(["exports", "foo"], function (exports, _foo) {
 
   var _interopRequireWildcard = function (obj) { return obj && obj.__esModule ? obj : { "default": obj }; };
 
-  var _defaults = function (obj, defaults) { var keys = Object.getOwnPropertyNames(defaults); for (var i = 0; i < keys.length; i++) { var key = keys[i]; var value = Object.getOwnPropertyDescriptor(defaults, key); if (value.configurable && obj[key] === undefined) { Object.defineProperty(obj, key, value); } } return obj; };
+  var _defaults = function (obj, defaults) { var keys = Object.getOwnPropertyNames(defaults); for (var i = 0; i < keys.length; i++) { var key = keys[i]; var value = Object.getOwnPropertyDescriptor(defaults, key); if (value && value.configurable && obj[key] === undefined) { Object.defineProperty(obj, key, value); } } return obj; };
 
   _defaults(exports, _interopRequireWildcard(_foo));
 

test/fixtures/transformation/es6-modules-common/exports-from/expected.js

@@ -2,7 +2,7 @@
 
 var _interopRequireWildcard = function (obj) { return obj && obj.__esModule ? obj : { "default": obj }; };
 
-var _defaults = function (obj, defaults) { var keys = Object.getOwnPropertyNames(defaults); for (var i = 0; i < keys.length; i++) { var key = keys[i]; var value = Object.getOwnPropertyDescriptor(defaults, key); if (value.configurable && obj[key] === undefined) { Object.defineProperty(obj, key, value); } } return obj; };
+var _defaults = function (obj, defaults) { var keys = Object.getOwnPropertyNames(defaults); for (var i = 0; i < keys.length; i++) { var key = keys[i]; var value = Object.getOwnPropertyDescriptor(defaults, key); if (value && value.configurable && obj[key] === undefined) { Object.defineProperty(obj, key, value); } } return obj; };
 
 var _foo = require("foo");
 

test/fixtures/transformation/es6-modules-umd/exports-from/expected.js

@@ -9,7 +9,7 @@
 
   var _interopRequireWildcard = function (obj) { return obj && obj.__esModule ? obj : { "default": obj }; };
 
-  var _defaults = function (obj, defaults) { var keys = Object.getOwnPropertyNames(defaults); for (var i = 0; i < keys.length; i++) { var key = keys[i]; var value = Object.getOwnPropertyDescriptor(defaults, key); if (value.configurable && obj[key] === undefined) { Object.defineProperty(obj, key, value); } } return obj; };
+  var _defaults = function (obj, defaults) { var keys = Object.getOwnPropertyNames(defaults); for (var i = 0; i < keys.length; i++) { var key = keys[i]; var value = Object.getOwnPropertyDescriptor(defaults, key); if (value && value.configurable && obj[key] === undefined) { Object.defineProperty(obj, key, value); } } return obj; };
 
   _defaults(exports, _interopRequireWildcard(_foo));
 

test/fixtures/transformation/spec-proto-to-assign/assignment-expression/expected.js

@@ -1,7 +1,7 @@
 "use strict";
 
 var _foo, _foo$bar, _foo$bar2;
-var _defaults = function (obj, defaults) { var keys = Object.getOwnPropertyNames(defaults); for (var i = 0; i < keys.length; i++) { var key = keys[i]; var value = Object.getOwnPropertyDescriptor(defaults, key); if (value.configurable && obj[key] === undefined) { Object.defineProperty(obj, key, value); } } return obj; };
+var _defaults = function (obj, defaults) { var keys = Object.getOwnPropertyNames(defaults); for (var i = 0; i < keys.length; i++) { var key = keys[i]; var value = Object.getOwnPropertyDescriptor(defaults, key); if (value && value.configurable && obj[key] === undefined) { Object.defineProperty(obj, key, value); } } return obj; };
 
 console.log((_foo = foo, _defaults(_foo, bar), _foo));
 

test/fixtures/transformation/spec-proto-to-assign/assignment-statement/expected.js

@@ -1,5 +1,5 @@
 "use strict";
 
-var _defaults = function (obj, defaults) { var keys = Object.getOwnPropertyNames(defaults); for (var i = 0; i < keys.length; i++) { var key = keys[i]; var value = Object.getOwnPropertyDescriptor(defaults, key); if (value.configurable && obj[key] === undefined) { Object.defineProperty(obj, key, value); } } return obj; };
+var _defaults = function (obj, defaults) { var keys = Object.getOwnPropertyNames(defaults); for (var i = 0; i < keys.length; i++) { var key = keys[i]; var value = Object.getOwnPropertyDescriptor(defaults, key); if (value && value.configurable && obj[key] === undefined) { Object.defineProperty(obj, key, value); } } return obj; };
 
 _defaults(obj, bar);

test/fixtures/transformation/spec-proto-to-assign/class/expected.js

@@ -1,6 +1,6 @@
 "use strict";
 
-var _defaults = function (obj, defaults) { var keys = Object.getOwnPropertyNames(defaults); for (var i = 0; i < keys.length; i++) { var key = keys[i]; var value = Object.getOwnPropertyDescriptor(defaults, key); if (value.configurable && obj[key] === undefined) { Object.defineProperty(obj, key, value); } } return obj; };
+var _defaults = function (obj, defaults) { var keys = Object.getOwnPropertyNames(defaults); for (var i = 0; i < keys.length; i++) { var key = keys[i]; var value = Object.getOwnPropertyDescriptor(defaults, key); if (value && value.configurable && obj[key] === undefined) { Object.defineProperty(obj, key, value); } } return obj; };
 
 var _inherits = function (subClass, superClass) { if (typeof superClass !== "function" && superClass !== null) { throw new TypeError("Super expression must either be null or a function, not " + typeof superClass); } subClass.prototype = Object.create(superClass && superClass.prototype, { constructor: { value: subClass, enumerable: false, writable: true, configurable: true } }); if (superClass) _defaults(subClass, superClass); };