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'use strict';
// Copyright (c) 2020 Ecma International. All rights reserved.
// This code is governed by the BSD license found in the LICENSE file.
/*---
esid: sec-assignment-operators-runtime-semantics-evaluation
description: >
Strict Mode - TypeError is thrown if The LeftHandSide of a Logical
Assignment operator(??=) is a reference to a non-existent property
of an object whose [[Extensible]] internal property is false.
flags: [onlyStrict]
features: [logical-assignment-operators]
---*/
var obj = {};
Object.preventExtensions(obj);
assert.throws(TypeError, function() {
obj.prop ??= 1;
});
assert.sameValue(obj.prop, undefined, "obj.prop");
reportCompare(0, 0);
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