| // 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 not thrown if the LeftHandSide of a Logical |
| Assignment operator(??=) is a reference to a data property with the |
| attribute value {[[Writable]]:false} and PutValue step is not reached. |
| flags: [onlyStrict] |
| features: [logical-assignment-operators] |
| |
| ---*/ |
| |
| var obj = {}; |
| Object.defineProperty(obj, "prop", { |
| value: 0, |
| writable: false, |
| enumerable: true, |
| configurable: true |
| }); |
| |
| assert.sameValue(obj.prop ??= 1, 0, "obj.prop"); |
