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- // 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");
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