trap-is-null.js (1483B)
1 // Copyright (C) 2015 the V8 project authors. All rights reserved. 2 // This code is governed by the BSD license found in the LICENSE file. 3 4 /*--- 5 esid: sec-proxy-object-internal-methods-and-internal-slots-construct-argumentslist-newtarget 6 description: > 7 If the construct trap value is null, propagate the construct to the target object. 8 info: | 9 [[Construct]] (argumentsList, newTarget) 10 11 ... 12 5. Let trap be ? GetMethod(handler, "construct"). 13 6. If trap is undefined, then 14 a. Assert: target has a [[Construct]] internal method. 15 b. Return ? Construct(target, argumentsList, newTarget). 16 ... 17 18 GetMethod ( V, P ) 19 20 ... 21 3. If func is either undefined or null, return undefined. 22 ... 23 features: [Proxy, Reflect, Reflect.construct] 24 ---*/ 25 26 var calls = 0; 27 var _NewTarget; 28 29 var Target = new Proxy(function() { 30 throw new Test262Error('target should not be called'); 31 }, { 32 construct: function(_Target, args, NewTarget) { 33 calls += 1; 34 _NewTarget = NewTarget; 35 return { 36 sum: args[0] + args[1] 37 }; 38 } 39 }) 40 41 var P = new Proxy(Target, { 42 construct: null 43 }); 44 45 var NewTarget = function() {}; 46 var obj = Reflect.construct(P, [3, 4], NewTarget); 47 48 assert.sameValue(calls, 1, "construct is null: [[Construct]] is invoked once"); 49 assert.sameValue(_NewTarget, NewTarget, "construct is null: NewTarget is passed to [[Construct]]"); 50 assert.sameValue(obj.sum, 7, "construct is null: result of [[Construct]] is returned"); 51 52 reportCompare(0, 0);