--- /dev/null
+var $ = require('../internals/export');
+var anObject = require('../internals/an-object');
+var isObject = require('../internals/is-object');
+var has = require('../internals/has');
+var fails = require('../internals/fails');
+var definePropertyModule = require('../internals/object-define-property');
+var getOwnPropertyDescriptorModule = require('../internals/object-get-own-property-descriptor');
+var getPrototypeOf = require('../internals/object-get-prototype-of');
+var createPropertyDescriptor = require('../internals/create-property-descriptor');
+
+// `Reflect.set` method
+// https://tc39.es/ecma262/#sec-reflect.set
+function set(target, propertyKey, V /* , receiver */) {
+ var receiver = arguments.length < 4 ? target : arguments[3];
+ var ownDescriptor = getOwnPropertyDescriptorModule.f(anObject(target), propertyKey);
+ var existingDescriptor, prototype;
+ if (!ownDescriptor) {
+ if (isObject(prototype = getPrototypeOf(target))) {
+ return set(prototype, propertyKey, V, receiver);
+ }
+ ownDescriptor = createPropertyDescriptor(0);
+ }
+ if (has(ownDescriptor, 'value')) {
+ if (ownDescriptor.writable === false || !isObject(receiver)) return false;
+ if (existingDescriptor = getOwnPropertyDescriptorModule.f(receiver, propertyKey)) {
+ if (existingDescriptor.get || existingDescriptor.set || existingDescriptor.writable === false) return false;
+ existingDescriptor.value = V;
+ definePropertyModule.f(receiver, propertyKey, existingDescriptor);
+ } else definePropertyModule.f(receiver, propertyKey, createPropertyDescriptor(0, V));
+ return true;
+ }
+ return ownDescriptor.set === undefined ? false : (ownDescriptor.set.call(receiver, V), true);
+}
+
+// MS Edge 17-18 Reflect.set allows setting the property to object
+// with non-writable property on the prototype
+var MS_EDGE_BUG = fails(function () {
+ var Constructor = function () { /* empty */ };
+ var object = definePropertyModule.f(new Constructor(), 'a', { configurable: true });
+ /* global Reflect -- required for testing */
+ return Reflect.set(Constructor.prototype, 'a', 1, object) !== false;
+});
+
+$({ target: 'Reflect', stat: true, forced: MS_EDGE_BUG }, {
+ set: set
+});