1 var $ = require('../internals/export');
2 var call = require('../internals/function-call');
3 var anObject = require('../internals/an-object');
4 var isObject = require('../internals/is-object');
5 var isDataDescriptor = require('../internals/is-data-descriptor');
6 var fails = require('../internals/fails');
7 var definePropertyModule = require('../internals/object-define-property');
8 var getOwnPropertyDescriptorModule = require('../internals/object-get-own-property-descriptor');
9 var getPrototypeOf = require('../internals/object-get-prototype-of');
10 var createPropertyDescriptor = require('../internals/create-property-descriptor');
12 // `Reflect.set` method
13 // https://tc39.es/ecma262/#sec-reflect.set
14 function set(target, propertyKey, V /* , receiver */) {
15 var receiver = arguments.length < 4 ? target : arguments[3];
16 var ownDescriptor = getOwnPropertyDescriptorModule.f(anObject(target), propertyKey);
17 var existingDescriptor, prototype, setter;
19 if (isObject(prototype = getPrototypeOf(target))) {
20 return set(prototype, propertyKey, V, receiver);
22 ownDescriptor = createPropertyDescriptor(0);
24 if (isDataDescriptor(ownDescriptor)) {
25 if (ownDescriptor.writable === false || !isObject(receiver)) return false;
26 if (existingDescriptor = getOwnPropertyDescriptorModule.f(receiver, propertyKey)) {
27 if (existingDescriptor.get || existingDescriptor.set || existingDescriptor.writable === false) return false;
28 existingDescriptor.value = V;
29 definePropertyModule.f(receiver, propertyKey, existingDescriptor);
30 } else definePropertyModule.f(receiver, propertyKey, createPropertyDescriptor(0, V));
32 setter = ownDescriptor.set;
33 if (setter === undefined) return false;
34 call(setter, receiver, V);
38 // MS Edge 17-18 Reflect.set allows setting the property to object
39 // with non-writable property on the prototype
40 var MS_EDGE_BUG = fails(function () {
41 var Constructor = function () { /* empty */ };
42 var object = definePropertyModule.f(new Constructor(), 'a', { configurable: true });
43 // eslint-disable-next-line es/no-reflect -- required for testing
44 return Reflect.set(Constructor.prototype, 'a', 1, object) !== false;
47 $({ target: 'Reflect', stat: true, forced: MS_EDGE_BUG }, {