trap-is-undefined-target-is-proxy.js

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// |reftest| module

// 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-preventextensions

description: >

  If "preventExtensions" trap is null or undefined, [[PreventExtensions]] call

  is properly forwarded to [[ProxyTarget]] (which is also a Proxy object).

info: |

  [[PreventExtensions]] ( )

  [...]

  4. Let target be O.[[ProxyTarget]].

  5. Let trap be ? GetMethod(handler, "preventExtensions").

  6. If trap is undefined, then

    a. Return ? target.[[PreventExtensions]]().

  [[PreventExtensions]] ( )

  1. Return true.

features: [Proxy, Reflect]

flags: [module]

---*/

import * as ns from "./trap-is-undefined-target-is-proxy.js";

var nsTarget = new Proxy(ns, {});

var nsProxy = new Proxy(nsTarget, {

  preventExtensions: undefined,

});

assert(Reflect.preventExtensions(nsProxy));

reportCompare(0, 0);