mirror of https://github.com/tc39/test262.git
58 lines
1.4 KiB
JavaScript
58 lines
1.4 KiB
JavaScript
// Copyright (C) 2020 Alexey 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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If "defineProperty" trap is null or undefined, [[DefineOwnProperty]] call
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is properly forwarded to [[ProxyTarget]] (which is also a Proxy object).
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info: |
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[[DefineOwnProperty]] (P, Desc)
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[...]
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5. Let target be O.[[ProxyTarget]].
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6. Let trap be ? GetMethod(handler, "defineProperty").
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7. If trap is undefined, then
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a. Return ? target.[[DefineOwnProperty]](P, Desc).
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features: [Proxy, Reflect]
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includes: [propertyHelper.js]
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---*/
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var plainObject = Object.create(null);
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Object.defineProperty(plainObject, "foo", {
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configurable: false,
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});
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var plainObjectTarget = new Proxy(plainObject, {});
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var plainObjectProxy = new Proxy(plainObjectTarget, {
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defineProperty: null,
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});
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assert.throws(TypeError, function() {
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Object.defineProperty(plainObjectProxy, "foo", {
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configurable: true,
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});
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});
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Object.defineProperty(plainObjectProxy, "bar", {
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get: function() {
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return 2;
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},
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});
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assert.sameValue(plainObject.bar, 2);
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var regExp = /(?:)/g;
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var regExpTarget = new Proxy(regExp, {});
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var regExpProxy = new Proxy(regExpTarget, {
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defineProperty: null,
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});
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assert(
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Reflect.defineProperty(regExpProxy, "lastIndex", {
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writable: false,
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})
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);
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verifyNotWritable(regExp, "lastIndex");
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