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31 lines
842 B
JavaScript
31 lines
842 B
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-preventextensions
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description: >
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If "preventExtensions" trap is null or undefined, [[PreventExtensions]] 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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[[PreventExtensions]] ( )
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[...]
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4. Let target be O.[[ProxyTarget]].
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5. Let trap be ? GetMethod(handler, "preventExtensions").
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6. If trap is undefined, then
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a. Return ? target.[[PreventExtensions]]().
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features: [Proxy]
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---*/
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var target = new Proxy({}, {
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preventExtensions: function(_target) {
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return false;
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},
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});
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var proxy = new Proxy(target, {});
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assert.throws(TypeError, function() {
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Object.preventExtensions(proxy);
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});
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