Port set-prototype-of to ext

object/create.js

@@ -0,0 +1,43 @@
+// Workaround for http://code.google.com/p/v8/issues/detail?id=2804
+
+"use strict";
+
+var create = Object.create, shim;
+
+if (!require("./set-prototype-of/is-implemented")()) {
+	shim = require("./set-prototype-of/implementation");
+}
+
+module.exports = (function () {
+	var nullObject, polyProps, desc;
+	if (!shim) return create;
+	if (shim.level !== 1) return create;
+
+	nullObject = {};
+	polyProps = {};
+	desc = { configurable: false, enumerable: false, writable: true, value: undefined };
+	Object.getOwnPropertyNames(Object.prototype).forEach(function (name) {
+		if (name === "__proto__") {
+			polyProps[name] = {
+				configurable: true,
+				enumerable: false,
+				writable: true,
+				value: undefined
+			};
+			return;
+		}
+		polyProps[name] = desc;
+	});
+	Object.defineProperties(nullObject, polyProps);
+
+	Object.defineProperty(shim, "nullPolyfill", {
+		configurable: false,
+		enumerable: false,
+		writable: false,
+		value: nullObject
+	});
+
+	return function (prototype, props) {
+		return create(prototype === null ? nullObject : prototype, props);
+	};
+})();

object/is-object.js

@@ -0,0 +1,7 @@
+"use strict";
+
+var isValue = require("./is-value");
+
+var map = { function: true, object: true };
+
+module.exports = function (value) { return (isValue(value) && map[typeof value]) || false; };

object/set-prototype-of/implement.js

@@ -0,0 +1,10 @@
+"use strict";
+
+if (!require("./is-implemented")()) {
+	Object.defineProperty(Object, "setPrototypeOf", {
+		value: require("./implementation"),
+		configurable: true,
+		enumerable: false,
+		writable: true
+	});
+}

object/set-prototype-of/implementation.js

@@ -0,0 +1,81 @@
+/* eslint no-proto: "off" */
+
+// Big thanks to @WebReflection for sorting this out
+// https://gist.github.com/WebReflection/5593554
+
+"use strict";
+
+var isObject         = require("../is-object")
+  , value            = require("../valid-value")
+  , objIsPrototypeOf = Object.prototype.isPrototypeOf
+  , defineProperty   = Object.defineProperty
+  , nullDesc         = { configurable: true, enumerable: false, writable: true, value: undefined }
+  , validate;
+
+validate = function (obj, prototype) {
+	value(obj);
+	if (prototype === null || isObject(prototype)) return obj;
+	throw new TypeError("Prototype must be null or an object");
+};
+
+module.exports = (function (status) {
+	var fn, set;
+	if (!status) return null;
+	if (status.level === 2) {
+		if (status.set) {
+			set = status.set;
+			fn = function (obj, prototype) {
+				set.call(validate(obj, prototype), prototype);
+				return obj;
+			};
+		} else {
+			fn = function (obj, prototype) {
+				validate(obj, prototype).__proto__ = prototype;
+				return obj;
+			};
+		}
+	} else {
+		fn = function self(obj, prototype) {
+			var isNullBase;
+			validate(obj, prototype);
+			isNullBase = objIsPrototypeOf.call(self.nullPolyfill, obj);
+			if (isNullBase) delete self.nullPolyfill.__proto__;
+			if (prototype === null) prototype = self.nullPolyfill;
+			obj.__proto__ = prototype;
+			if (isNullBase) defineProperty(self.nullPolyfill, "__proto__", nullDesc);
+			return obj;
+		};
+	}
+	return Object.defineProperty(fn, "level", {
+		configurable: false,
+		enumerable: false,
+		writable: false,
+		value: status.level
+	});
+})(
+	(function () {
+		var tmpObj1 = Object.create(null)
+		  , tmpObj2 = {}
+		  , set
+		  , desc = Object.getOwnPropertyDescriptor(Object.prototype, "__proto__");
+
+		if (desc) {
+			try {
+				set = desc.set; // Opera crashes at this point
+				set.call(tmpObj1, tmpObj2);
+			} catch (ignore) {}
+			if (Object.getPrototypeOf(tmpObj1) === tmpObj2) return { set: set, level: 2 };
+		}
+
+		tmpObj1.__proto__ = tmpObj2;
+		if (Object.getPrototypeOf(tmpObj1) === tmpObj2) return { level: 2 };
+
+		tmpObj1 = {};
+		tmpObj1.__proto__ = tmpObj2;
+		if (Object.getPrototypeOf(tmpObj1) === tmpObj2) return { level: 1 };
+
+		return false;
+	})()
+);
+
+require("../create");

object/set-prototype-of/index.js

@@ -0,0 +1,3 @@
+"use strict";
+
+module.exports = require("./is-implemented")() ? Object.setPrototypeOf : require("./implementation");

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

@@ -0,0 +1,9 @@
+"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;
+};

object/valid-value.js

@@ -0,0 +1,8 @@
+"use strict";
+
+var isValue = require("./is-value");
+
+module.exports = function (value) {
+	if (!isValue(value)) throw new TypeError("Cannot use null or undefined");
+	return value;
+};