| // Copyright (C) 2020 Alexey Shvayka. All rights reserved. |
| // This code is governed by the BSD license found in the LICENSE file. |
| |
| /*--- |
| esid: sec-proxy-object-internal-methods-and-internal-slots-setprototypeof-v |
| description: > |
| If "setPrototypeOf" trap is null or undefined, [[SetPrototypeOf]] call |
| is properly forwarded to [[ProxyTarget]] (which is also a Proxy object). |
| info: | |
| [[SetPrototypeOf]] ( V ) |
| |
| [...] |
| 5. Let target be O.[[ProxyTarget]]. |
| 6. Let trap be ? GetMethod(handler, "setPrototypeOf"). |
| 7. If trap is undefined, then |
| a. Return ? target.[[SetPrototypeOf]](V). |
| |
| OrdinarySetPrototypeOf ( O, V ) |
| |
| [...] |
| 4. Let extensible be O.[[Extensible]]. |
| 5. If extensible is false, return false. |
| features: [Proxy] |
| ---*/ |
| |
| var array = []; |
| var arrayTarget = new Proxy(array, {}); |
| var arrayProxy = new Proxy(arrayTarget, { |
| setPrototypeOf: undefined, |
| }); |
| |
| Object.setPrototypeOf(arrayProxy, Number.prototype); |
| assert.sameValue(Object.getPrototypeOf(array), Number.prototype); |
| |
| Object.preventExtensions(array); |
| assert.throws(TypeError, function() { |
| Object.setPrototypeOf(arrayProxy, null); |
| }); |