es.object.lookup-setter.js
5d92ed19fb80issn4frontend

es.object.lookup-setter.js
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			'use strict';
			var $ = require('../internals/export');
			var DESCRIPTORS = require('../internals/descriptors');
			var FORCED = require('../internals/object-prototype-accessors-forced');
			var toObject = require('../internals/to-object');
			var toPropertyKey = require('../internals/to-property-key');
			var getPrototypeOf = require('../internals/object-get-prototype-of');
			var getOwnPropertyDescriptor = require('../internals/object-get-own-property-descriptor').f;

			// `Object.prototype.__lookupSetter__` method
			// https://tc39.es/ecma262/#sec-object.prototype.__lookupSetter__
			if (DESCRIPTORS) {
			$({ target: 'Object', proto: true, forced: FORCED }, {
			__lookupSetter__: function __lookupSetter__(P) {
			var O = toObject(this);
			var key = toPropertyKey(P);
			var desc;
			do {
			if (desc = getOwnPropertyDescriptor(O, key)) return desc.set;
			} while (O = getPrototypeOf(O));
			}
			});
			}