newtarget-proto-custom.js (1442B)
1 // Copyright (C) 2019 Leo Balter. All rights reserved. 2 // This code is governed by the BSD license found in the LICENSE file. 3 4 /*--- 5 esid: sec-aggregate-error 6 description: > 7 Use a custom NewTarget prototype 8 info: | 9 AggregateError ( errors, message ) 10 11 1. If NewTarget is undefined, let newTarget be the active function object, else let newTarget be NewTarget. 12 2. Let O be ? OrdinaryCreateFromConstructor(newTarget, "%AggregateError.prototype%", « [[ErrorData]], [[AggregateErrors]] »). 13 ... 14 6. Return O. 15 16 OrdinaryCreateFromConstructor ( constructor, intrinsicDefaultProto [ , internalSlotsList ] ) 17 18 ... 19 2. Let proto be ? GetPrototypeFromConstructor(constructor, intrinsicDefaultProto). 20 3. Return ObjectCreate(proto, internalSlotsList). 21 22 GetPrototypeFromConstructor ( constructor, intrinsicDefaultProto ) 23 24 ... 25 3. Let proto be ? Get(constructor, "prototype"). 26 4. If Type(proto) is not Object, then 27 a. Let realm be ? GetFunctionRealm(constructor). 28 b. Set proto to realm's intrinsic object named intrinsicDefaultProto. 29 Return proto. 30 features: [AggregateError, Reflect.construct] 31 ---*/ 32 33 var custom = { x: 42 }; 34 var newt = new Proxy(function() {}, { 35 get(t, p) { 36 if (p === 'prototype') { 37 return custom; 38 } 39 40 return t[p]; 41 } 42 }); 43 44 var obj = Reflect.construct(AggregateError, [[]], newt); 45 46 assert.sameValue(Object.getPrototypeOf(obj), custom); 47 assert.sameValue(obj.x, 42); 48 49 reportCompare(0, 0);