text: // 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-defineownproperty-p-desc
  description: >
    If "defineProperty" trap is null or undefined, [[DefineOwnProperty]] call
    is properly forwarded to [[ProxyTarget]] (which is also a Proxy object).
  info: |
    [[DefineOwnProperty]] (P, Desc)
  
    [...]
    5. Let target be O.[[ProxyTarget]].
    6. Let trap be ? GetMethod(handler, "defineProperty").
    7. If trap is undefined, then
      a. Return ? target.[[DefineOwnProperty]](P, Desc).
  features: [Proxy, Reflect]
  ---*/
  
  var string = new String("str");
  var stringTarget = new Proxy(string, {});
  var stringProxy = new Proxy(stringTarget, {});
  
  assert(Reflect.defineProperty(stringProxy, "4", {value: 4}));
  assert.sameValue(string[4], 4);
  
  assert.throws(TypeError, function() {
    Object.defineProperty(stringProxy, "0", {
      value: "x",
    });
  });
  
  Object.preventExtensions(string);
  assert(!Reflect.defineProperty(stringProxy, "foo", {value: 5}));
  
  
  var func = function() {};
  var funcTarget = new Proxy(func, {});
  var funcProxy = new Proxy(funcTarget, {});
  
  Object.defineProperty(funcProxy, "name", {value: "foo"});
  assert.sameValue(func.name, "foo");
  
  assert.throws(TypeError, function() {
    Object.defineProperty(funcProxy, "prototype", {
      set: function(_value) {},
    });
  });
  