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36 lines
876 B
JavaScript
36 lines
876 B
JavaScript
// Copyright (C) 2015 the V8 project authors. 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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es6id: 26.1.12
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description: >
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Prevent extentions on target.
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info: |
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26.1.12 Reflect.preventExtensions ( target )
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...
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2. Return target.[[PreventExtensions]]().
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9.1.4 [[PreventExtensions]] ( )
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1. Set the value of the [[Extensible]] internal slot of O to false.
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...
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features: [Reflect]
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---*/
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var o = {};
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Reflect.preventExtensions(o);
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assert.sameValue(Object.isExtensible(o), false, 'object is not extensible');
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assert.throws(TypeError, function() {
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Object.defineProperty(o, 'y', {});
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});
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assert.throws(TypeError, function() {
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Object.setPrototypeOf(o, Array.prototype);
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});
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Reflect.preventExtensions(o);
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assert.sameValue(
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Object.isExtensible(o), false,
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'object is still not extensible on exhausted calls'
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);
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