// Copyright (C) 2019 Aleksey Shvayka. All rights reserved.
// This code is governed by the BSD license found in the LICENSE file.
/*---
esid: sec-proxy-object-internal-methods-and-internal-slots-defineownproperty-p-desc
description: >
Throw a TypeError exception if trap result is true, targetDesc is not configurable
and writable, while Desc is not writable.
info: |
[[DefineOwnProperty]] (P, Desc)
...
16. Else targetDesc is not undefined,
...
c. If IsDataDescriptor(targetDesc) is true, targetDesc.[[Configurable]] is
false, and targetDesc.[[Writable]] is true, then
i. If Desc has a [[Writable]] field and Desc.[[Writable]] is
false, throw a TypeError exception.
...
features: [Proxy, Reflect, proxy-missing-checks]
---*/
var trapCalls = 0;
var p = new Proxy({}, {
defineProperty: function(t, prop, desc) {
Object.defineProperty(t, prop, {
configurable: false,
writable: true,
});
trapCalls++;
return true;
},
});
assert.throws(TypeError, function() {
Reflect.defineProperty(p, "prop", {
writable: false,
});
});
assert.sameValue(trapCalls, 1);