mirror of https://github.com/tc39/test262.git
41 lines
1.1 KiB
JavaScript
41 lines
1.1 KiB
JavaScript
// Copyright (C) 2019 Aleksey Shvayka. All rights reserved.
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// This code is governed by the BSD license found in the LICENSE file.
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/*---
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esid: sec-proxy-object-internal-methods-and-internal-slots-defineownproperty-p-desc
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description: >
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Throw a TypeError exception if trap result is true, targetDesc is not configurable
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and writable, while Desc is not writable.
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info: |
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[[DefineOwnProperty]] (P, Desc)
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...
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16. Else targetDesc is not undefined,
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...
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c. If IsDataDescriptor(targetDesc) is true, targetDesc.[[Configurable]] is
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false, and targetDesc.[[Writable]] is true, then
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i. If Desc has a [[Writable]] field and Desc.[[Writable]] is
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false, throw a TypeError exception.
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...
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features: [Proxy, Reflect, proxy-missing-checks]
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---*/
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var trapCalls = 0;
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var p = new Proxy({}, {
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defineProperty: function(t, prop, desc) {
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Object.defineProperty(t, prop, {
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configurable: false,
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writable: true,
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});
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trapCalls++;
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return true;
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},
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});
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assert.throws(TypeError, function() {
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Reflect.defineProperty(p, "prop", {
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writable: false,
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});
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});
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assert.sameValue(trapCalls, 1);
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