| 'use strict'; |
| var $ = require('../internals/export'); |
| var DESCRIPTORS = require('../internals/descriptors'); |
| var FORCED = require('../internals/forced-object-prototype-accessors-methods'); |
| var toObject = require('../internals/to-object'); |
| var toPrimitive = require('../internals/to-primitive'); |
| var getPrototypeOf = require('../internals/object-get-prototype-of'); |
| var getOwnPropertyDescriptor = require('../internals/object-get-own-property-descriptor').f; |
| |
| // `Object.prototype.__lookupSetter__` method |
| // https://tc39.github.io/ecma262/#sec-object.prototype.__lookupSetter__ |
| if (DESCRIPTORS) { |
| $({ target: 'Object', proto: true, forced: FORCED }, { |
| __lookupSetter__: function __lookupSetter__(P) { |
| var O = toObject(this); |
| var key = toPrimitive(P, true); |
| var desc; |
| do { |
| if (desc = getOwnPropertyDescriptor(O, key)) return desc.set; |
| } while (O = getPrototypeOf(O)); |
| } |
| }); |
| } |