es5-ext/object/set-prototype-of/is-implemented.js

ECMAScript extensions and shims

"use strict";

var create = Object.create, getPrototypeOf = Object.getPrototypeOf, plainObject = {};

module.exports = function (/* CustomCreate*/) {
	var setPrototypeOf = Object.setPrototypeOf, customCreate = arguments[0] || create;
	if (typeof setPrototypeOf !== "function") return false;
	return getPrototypeOf(setPrototypeOf(customCreate(null), plainObject)) === plainObject;
};