1'use strict';
2var isObject = require('./_is-object');
3var getPrototypeOf = require('./_object-gpo');
4var HAS_INSTANCE = require('./_wks')('hasInstance');
5var FunctionProto = Function.prototype;
6// 19.2.3.6 Function.prototype[@@hasInstance](V)
7if (!(HAS_INSTANCE in FunctionProto)) require('./_object-dp').f(FunctionProto, HAS_INSTANCE, { value: function (O) {
8  if (typeof this != 'function' || !isObject(O)) return false;
9  if (!isObject(this.prototype)) return O instanceof this;
10  // for environment w/o native `@@hasInstance` logic enough `instanceof`, but add this:
11  while (O = getPrototypeOf(O)) if (this.prototype === O) return true;
12  return false;
13} });
14