trap-is-null-target-is-proxy.js (1252B)
1 // Copyright (C) 2020 Alexey Shvayka. 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-get-p-receiver 6 description: > 7 If "get" trap is null or undefined, [[Get]] call is properly 8 forwarded to [[ProxyTarget]] (which is also a Proxy object). 9 info: | 10 [[Get]] ( P, Receiver ) 11 12 [...] 13 5. Let target be O.[[ProxyTarget]]. 14 6. Let trap be ? GetMethod(handler, "get"). 15 7. If trap is undefined, then 16 a. Return ? target.[[Get]](P, Receiver). 17 features: [Proxy, Symbol] 18 ---*/ 19 20 var stringTarget = new Proxy(new String("str"), {}); 21 var stringProxy = new Proxy(stringTarget, { 22 get: null, 23 }); 24 25 assert.sameValue(stringProxy.length, 3); 26 assert.sameValue(stringProxy[0], "s"); 27 assert.sameValue(stringProxy[4], undefined); 28 29 30 var sym = Symbol(); 31 var target = new Proxy({}, { 32 get: function(_target, key) { 33 switch (key) { 34 case sym: return 1; 35 case "10": return 2; 36 case "foo": return 3; 37 } 38 }, 39 }); 40 41 var proxy = new Proxy(target, { 42 get: null, 43 }); 44 45 assert.sameValue(proxy[sym], 1); 46 assert.sameValue(proxy[10], 2); 47 assert.sameValue(Object.create(proxy).foo, 3); 48 assert.sameValue(proxy.bar, undefined); 49 50 reportCompare(0, 0);