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load(libdir + "asserts.js");
/*
* Throw a TypeError if both the current descriptor and the descriptor returned
* by the trap are data descriptors, the current descriptor is non-configurable
* and non-writable, and the descriptor returned by the trap is writable.
*/
var target = {};
Object.defineProperty(target, 'foo', {
value: 'bar',
writable: false,
configurable: false
});
assertThrowsInstanceOf(function () {
Object.getOwnPropertyDescriptor(new Proxy(target, {
getOwnPropertyDescriptor: function (target, name) {
return {
value: 'bar',
writable: true,
configurable: false
};
}
}), 'foo');
}, TypeError);