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load(libdir + "asserts.js");
function testProxy(handlerReturn, prop, shouldThrow) {
var handler = { get: function () { return handlerReturn; } };
for (let p of [new Proxy(target, handler), Proxy.revocable(target, handler).proxy]) {
if (shouldThrow)
assertThrowsInstanceOf(function () { return p[prop]; }, TypeError);
else
assertEq(p[prop], handlerReturn);
}
}
/*
* Throw a TypeError if the trap reports a different value for a non-writable,
* non-configurable property
*/
var target = {};
Object.defineProperty(target, 'foo', {
value: 'bar',
writable: false,
configurable: false
});
testProxy('baz', 'foo', true);
/*
* Don't throw a TypeError if the trap reports the same value for a non-writable,
* non-configurable property
*/
testProxy('bar', 'foo', false);
/*
* Don't throw a TypeError if the trap reports a different value for a writable,
* non-configurable property
*/
Object.defineProperty(target, 'prop', {
value: 'bar',
writable: true,
configurable: false
});
testProxy('baz', 'prop', false);
/*
* Don't throw a TypeError if the trap reports a different value for a non-writable,
* configurable property
*/
Object.defineProperty(target, 'prop2', {
value: 'bar',
writable: false,
configurable: true
});
testProxy('baz', 'prop2', false);