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37 lines
1.4 KiB
JavaScript
37 lines
1.4 KiB
JavaScript
// Copyright (C) 2017 Caio Lima. 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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description: Mapped arguments property descriptor change to non-writable and non-configurable
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info: |
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Mapping stop working when property is set to non-writable. Here we change the
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descriptor using [[DefineOwnProperty]] to {writable: false} and then
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change property descriptor to {configurable: false} in sequence.
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The property descriptor need to be the one set before the property be
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configured as {writable: false}.
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flags: [noStrict]
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esid: sec-arguments-exotic-objects-defineownproperty-p-desc
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includes: [propertyHelper.js]
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---*/
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function fn(a) {
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Object.defineProperty(arguments, "0", {writable: false});
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Object.defineProperty(arguments, "0", {configurable: false});
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let propertyDescriptor = Object.getOwnPropertyDescriptor(arguments, "0");
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assert.sameValue(propertyDescriptor.value, 1);
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verifyEnumerable(arguments, "0");
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verifyNotWritable(arguments, "0");
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verifyNotConfigurable(arguments, "0");
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// Postcondition: Arguments mapping is removed. Descriptors need to be the same
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// as above.
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a = 2;
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propertyDescriptor = Object.getOwnPropertyDescriptor(arguments, "0");
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assert.sameValue(propertyDescriptor.value, 1);
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verifyEnumerable(arguments, "0");
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verifyNotWritable(arguments, "0");
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verifyNotConfigurable(arguments, "0");
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}
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fn(1);
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