| // Copyright (C) 2021 Alexey Shvayka. All rights reserved. |
| // This code is governed by the license found in the LICENSE file. |
| |
| /*--- |
| esid: sec-object.assign |
| description: > |
| [[Set]] to data property of frozen `target` fails with TypeError. |
| info: | |
| SetIntegrityLevel ( O, level ) |
| |
| [...] |
| 3. Let status be ? O.[[PreventExtensions]](). |
| [...] |
| 7. Else, |
| a. Assert: level is frozen. |
| b. For each element k of keys, do |
| i. Let currentDesc be ? O.[[GetOwnProperty]](k). |
| ii. If currentDesc is not undefined, then |
| 1. If IsAccessorDescriptor(currentDesc) is true, then |
| [...] |
| 2. Else, |
| a. Let desc be the PropertyDescriptor { [[Configurable]]: false, [[Writable]]: false }. |
| 3. Perform ? DefinePropertyOrThrow(O, k, desc). |
| 8. Return true. |
| |
| Object.assign ( target, ...sources ) |
| |
| [...] |
| 3. For each element nextSource of sources, do |
| a. If nextSource is neither undefined nor null, then |
| [...] |
| iii. For each element nextKey of keys, do |
| 1. Let desc be ? from.[[GetOwnProperty]](nextKey). |
| 2. If desc is not undefined and desc.[[Enumerable]] is true, then |
| [...] |
| b. Perform ? Set(to, nextKey, propValue, true). |
| |
| OrdinarySetWithOwnDescriptor ( O, P, V, Receiver, ownDesc ) |
| |
| [...] |
| 3. If IsDataDescriptor(ownDesc) is true, then |
| a. If ownDesc.[[Writable]] is false, return false. |
| features: [Symbol, Reflect] |
| ---*/ |
| |
| var sym = Symbol(); |
| var target1 = { [sym]: 1 }; |
| |
| Object.freeze(target1); |
| assert.throws(TypeError, function() { |
| Object.assign(target1, { [sym]: 1 }); |
| }); |
| |
| |
| var target2 = Object.freeze({ foo: 1 }); |
| |
| assert.throws(TypeError, function() { |
| Object.assign(target2, { foo: 1 }); |
| }); |