target-is-frozen-accessor-property-set-succeeds.js (1715B)
1 // Copyright (C) 2021 Alexey Shvayka. All rights reserved. 2 // This code is governed by the license found in the LICENSE file. 3 4 /*--- 5 esid: sec-object.assign 6 description: > 7 [[Set]] to accessor property of frozen `target` succeeds. 8 info: | 9 SetIntegrityLevel ( O, level ) 10 11 [...] 12 3. Let status be ? O.[[PreventExtensions]](). 13 [...] 14 7. Else, 15 a. Assert: level is frozen. 16 b. For each element k of keys, do 17 i. Let currentDesc be ? O.[[GetOwnProperty]](k). 18 ii. If currentDesc is not undefined, then 19 1. If IsAccessorDescriptor(currentDesc) is true, then 20 a. Let desc be the PropertyDescriptor { [[Configurable]]: false }. 21 [...] 22 3. Perform ? DefinePropertyOrThrow(O, k, desc). 23 8. Return true. 24 25 Object.assign ( target, ...sources ) 26 27 [...] 28 3. For each element nextSource of sources, do 29 a. If nextSource is neither undefined nor null, then 30 [...] 31 iii. For each element nextKey of keys, do 32 1. Let desc be ? from.[[GetOwnProperty]](nextKey). 33 2. If desc is not undefined and desc.[[Enumerable]] is true, then 34 [...] 35 b. Perform ? Set(to, nextKey, propValue, true). 36 37 OrdinarySetWithOwnDescriptor ( O, P, V, Receiver, ownDesc ) 38 39 [...] 40 7. Perform ? Call(setter, Receiver, « V »). 41 8. Return true. 42 features: [Symbol] 43 ---*/ 44 45 var value1 = 1; 46 var target1 = { 47 set foo(val) { value1 = val; }, 48 }; 49 50 Object.freeze(target1); 51 Object.assign(target1, { foo: 2 }); 52 assert.sameValue(value1, 2); 53 54 55 var sym = Symbol(); 56 var value2 = 1; 57 var target2 = Object.freeze({ 58 set [sym](val) { value2 = val; }, 59 }); 60 61 Object.freeze(target2); 62 Object.assign(target2, { [sym]: 2 }); 63 assert.sameValue(value2, 2); 64 65 reportCompare(0, 0);