Strict mode Failing
Expected no error, got TypeError: Cannot read property 'value' of undefined
non-Strict mode Failing
Expected no error, got TypeError: Cannot read property 'value' of undefined
Features:
- Symbol
- Proxy
- Reflect
Expected no error, got TypeError: Cannot read property 'value' of undefined
Expected no error, got TypeError: Cannot read property 'value' of undefined
// Copyright (C) 2021 Alexey Shvayka. All rights reserved.
// This code is governed by the BSD license found in the LICENSE file.
/*---
esid: sec-object.freeze
description: >
[[DefineOwnProperty]] is called with partial descriptor with only [[Configurable]] and
[[Writable]] (for data properties only) fields present.
info: |
SetIntegrityLevel ( O, level )
[...]
5. Let keys be ? O.[[OwnPropertyKeys]]().
[...]
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
a. Let desc be the PropertyDescriptor { [[Configurable]]: false }.
2. Else,
a. Let desc be the PropertyDescriptor { [[Configurable]]: false, [[Writable]]: false }.
3. Perform ? DefinePropertyOrThrow(O, k, desc).
features: [Symbol, Proxy, Reflect]
---*/
var sym = Symbol();
var seenDescriptors = {};
var proxy = new Proxy({
[sym]: 1,
get foo() {},
set foo(_v) {},
}, {
defineProperty: function(target, key, descriptor) {
seenDescriptors[key] = descriptor;
return Reflect.defineProperty(target, key, descriptor);
},
});
Object.freeze(proxy);
assert.sameValue(seenDescriptors[sym].value, undefined, "value");
assert.sameValue(seenDescriptors[sym].writable, false, "writable");
assert.sameValue(seenDescriptors[sym].enumerable, undefined, "enumerable");
assert.sameValue(seenDescriptors[sym].configurable, false, "configurable");
assert.sameValue(seenDescriptors.foo.get, undefined, "get");
assert.sameValue(seenDescriptors.foo.set, undefined, "set");
assert.sameValue(seenDescriptors.foo.enumerable, undefined, "enumerable");
assert.sameValue(seenDescriptors.foo.configurable, false, "configurable");