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60 lines
1.6 KiB
JavaScript
60 lines
1.6 KiB
JavaScript
// Copyright (C) 2021 Alexey Shvayka. All rights reserved.
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// This code is governed by the license found in the LICENSE file.
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/*---
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esid: sec-object.assign
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description: >
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[[Set]] to non-existing property of sealed `target` fails with TypeError.
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info: |
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SetIntegrityLevel ( O, level )
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[...]
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3. Let status be ? O.[[PreventExtensions]]().
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[...]
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Object.assign ( target, ...sources )
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[...]
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3. For each element nextSource of sources, do
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a. If nextSource is neither undefined nor null, then
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[...]
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iii. For each element nextKey of keys, do
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1. Let desc be ? from.[[GetOwnProperty]](nextKey).
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2. If desc is not undefined and desc.[[Enumerable]] is true, then
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[...]
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b. Perform ? Set(to, nextKey, propValue, true).
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OrdinarySetWithOwnDescriptor ( O, P, V, Receiver, ownDesc )
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[...]
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3. If IsDataDescriptor(ownDesc) is true, then
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[...]
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c. Let existingDescriptor be ? Receiver.[[GetOwnProperty]](P).
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d. If existingDescriptor is not undefined, then
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[...]
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e. Else,
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i. Assert: Receiver does not currently have a property P.
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ii. Return ? CreateDataProperty(Receiver, P, V).
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ValidateAndApplyPropertyDescriptor ( O, P, extensible, Desc, current )
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[...]
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2. If current is undefined, then
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a. If extensible is false, return false.
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features: [Symbol, Reflect]
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---*/
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var target1 = Object.seal({ foo: 1 });
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assert.throws(TypeError, function() {
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Object.assign(target1, { get bar() {} });
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});
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var target2 = {};
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Object.seal(target2);
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assert.throws(TypeError, function() {
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Object.assign(target2, { [Symbol()]: 1 });
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});
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