(just in case) make isDataDescriptor operation stricter

Author: zloirock

packages/core-js/internals/is-data-descriptor.js

@@ -0,0 +1,5 @@
+var has = require('../internals/has');
+
+module.exports = function (descriptor) {
+  return descriptor !== undefined && (has(descriptor, 'value') || has(descriptor, 'writable'));
+};

packages/core-js/modules/es.reflect.get.js

@@ -1,7 +1,7 @@
 var $ = require('../internals/export');
 var isObject = require('../internals/is-object');
 var anObject = require('../internals/an-object');
-var has = require('../internals/has');
+var isDataDescriptor = require('../internals/is-data-descriptor');
 var getOwnPropertyDescriptorModule = require('../internals/object-get-own-property-descriptor');
 var getPrototypeOf = require('../internals/object-get-prototype-of');
 
@@ -11,11 +11,10 @@ function get(target, propertyKey /* , receiver */) {
   var receiver = arguments.length < 3 ? target : arguments[2];
   var descriptor, prototype;
   if (anObject(target) === receiver) return target[propertyKey];
-  if (descriptor = getOwnPropertyDescriptorModule.f(target, propertyKey)) return has(descriptor, 'value')
+  descriptor = getOwnPropertyDescriptorModule.f(target, propertyKey);
+  if (descriptor) return isDataDescriptor(descriptor)
     ? descriptor.value
-    : descriptor.get === undefined
-      ? undefined
-      : descriptor.get.call(receiver);
+    : descriptor.get === undefined ? undefined : descriptor.get.call(receiver);
   if (isObject(prototype = getPrototypeOf(target))) return get(prototype, propertyKey, receiver);
 }
 

packages/core-js/modules/es.reflect.set.js

@@ -1,7 +1,7 @@
 var $ = require('../internals/export');
 var anObject = require('../internals/an-object');
 var isObject = require('../internals/is-object');
-var has = require('../internals/has');
+var isDataDescriptor = require('../internals/is-data-descriptor');
 var fails = require('../internals/fails');
 var definePropertyModule = require('../internals/object-define-property');
 var getOwnPropertyDescriptorModule = require('../internals/object-get-own-property-descriptor');
@@ -20,7 +20,7 @@ function set(target, propertyKey, V /* , receiver */) {
     }
     ownDescriptor = createPropertyDescriptor(0);
   }
-  if (has(ownDescriptor, 'value')) {
+  if (isDataDescriptor(ownDescriptor)) {
     if (ownDescriptor.writable === false || !isObject(receiver)) return false;
     if (existingDescriptor = getOwnPropertyDescriptorModule.f(receiver, propertyKey)) {
       if (existingDescriptor.get || existingDescriptor.set || existingDescriptor.writable === false) return false;