nonwritable-nonenumerable-nonconfigurable-descriptors-basic.js (1118B)
1 // Copyright (C) 2017 Caio Lima. All rights reserved. 2 // This code is governed by the BSD license found in the LICENSE file. 3 4 /*--- 5 description: Mapped arguments property descriptor change to non-writable and non-configurable 6 info: | 7 Change the descriptor using [[DefineOwnProperty]] to 8 {writable: false, enumerable: false} and then 9 change property descriptor to {configurable: false}. 10 The descriptor's enumerable property continue with its configured value 11 even if mapping stops. 12 flags: [noStrict] 13 esid: sec-arguments-exotic-objects-defineownproperty-p-desc 14 includes: [propertyHelper.js] 15 ---*/ 16 17 function fn(a) { 18 Object.defineProperty(arguments, "0", {writable: false, enumerable: false}); 19 Object.defineProperty(arguments, "0", {configurable: false}); 20 21 verifyProperty(arguments, "0", { 22 value: 1, 23 writable: false, 24 enumerable: false, 25 configurable: false, 26 }); 27 28 // Postcondition: Arguments mapping is removed. 29 a = 2; 30 31 verifyProperty(arguments, "0", { 32 value: 1, 33 writable: false, 34 enumerable: false, 35 configurable: false, 36 }); 37 } 38 fn(1); 39 40 reportCompare(0, 0);