Merge pull request #2 from justvanilla/hotfix/proxy-support

Proxy support

.licensed.yml

@@ -13,4 +13,11 @@ allowed:
 
 reviewed:
   npm:
-  - sax
+  - sax
+  - escodegen
+  - estraverse
+  - esutils
+  - ieee754
+  - readable-stream
+  - source-map
+  - string_decoder

dist/restore-only/bridge.js

@@ -0,0 +1,1010 @@
+'use strict';
+
+/**
+ * __        ___    ____  _   _ ___ _   _  ____
+ * \ \      / / \  |  _ \| \ | |_ _| \ | |/ ___|
+ *  \ \ /\ / / _ \ | |_) |  \| || ||  \| | |  _
+ *   \ V  V / ___ \|  _ <| |\  || || |\  | |_| |
+ *    \_/\_/_/   \_\_| \_\_| \_|___|_| \_|\____|
+ *
+ * This file is critical for vm2. It implements the bridge between the host and the sandbox.
+ * If you do not know exactly what you are doing, you should NOT edit this file.
+ *
+ * The file is loaded in the host and sandbox to handle objects in both directions.
+ * This is done to ensure that RangeErrors are from the correct context.
+ * The boundary between the sandbox and host might throw RangeErrors from both contexts.
+ * Therefore, thisFromOther and friends can handle objects from both domains.
+ *
+ * Method parameters have comments to tell from which context they came.
+ *
+ */
+
+const globalsList = [
+	'Number',
+	'String',
+	'Boolean',
+	'Date',
+	'RegExp',
+	'Map',
+	'WeakMap',
+	'Set',
+	'WeakSet',
+	'Promise',
+	'Function'
+];
+
+const errorsList = [
+	'RangeError',
+	'ReferenceError',
+	'SyntaxError',
+	'TypeError',
+	'EvalError',
+	'URIError',
+	'Error'
+];
+
+const OPNA = 'Operation not allowed on contextified object.';
+
+const thisGlobalPrototypes = {
+	__proto__: null,
+	Object: Object.prototype,
+	Array: Array.prototype
+};
+
+for (let i = 0; i < globalsList.length; i++) {
+	const key = globalsList[i];
+	const g = global[key];
+	if (g) thisGlobalPrototypes[key] = g.prototype;
+}
+
+for (let i = 0; i < errorsList.length; i++) {
+	const key = errorsList[i];
+	const g = global[key];
+	if (g) thisGlobalPrototypes[key] = g.prototype;
+}
+
+const {
+	getPrototypeOf: thisReflectGetPrototypeOf,
+	setPrototypeOf: thisReflectSetPrototypeOf,
+	defineProperty: thisReflectDefineProperty,
+	deleteProperty: thisReflectDeleteProperty,
+	getOwnPropertyDescriptor: thisReflectGetOwnPropertyDescriptor,
+	isExtensible: thisReflectIsExtensible,
+	preventExtensions: thisReflectPreventExtensions,
+	apply: thisReflectApply,
+	construct: thisReflectConstruct,
+	set: thisReflectSet,
+	get: thisReflectGet,
+	has: thisReflectHas,
+	ownKeys: thisReflectOwnKeys,
+	enumerate: thisReflectEnumerate,
+} = Reflect;
+
+const thisObject = Object;
+const {
+	freeze: thisObjectFreeze,
+	prototype: thisObjectPrototype
+} = thisObject;
+const thisObjectHasOwnProperty = thisObjectPrototype.hasOwnProperty;
+const ThisProxy = Proxy;
+const ThisWeakMap = WeakMap;
+const {
+	get: thisWeakMapGet,
+	set: thisWeakMapSet
+} = ThisWeakMap.prototype;
+const ThisMap = Map;
+const thisMapGet = ThisMap.prototype.get;
+const thisMapSet = ThisMap.prototype.set;
+const thisFunction = Function;
+const thisFunctionBind = thisFunction.prototype.bind;
+const thisArrayIsArray = Array.isArray;
+const thisErrorCaptureStackTrace = Error.captureStackTrace;
+
+const thisSymbolToString = Symbol.prototype.toString;
+const thisSymbolToStringTag = Symbol.toStringTag;
+const thisSymbolIterator = Symbol.iterator;
+const thisSymbolNodeJSUtilInspectCustom = Symbol.for('nodejs.util.inspect.custom');
+
+/**
+ * VMError.
+ *
+ * @public
+ * @extends {Error}
+ */
+class VMError extends Error {
+
+	/**
+	 * Create VMError instance.
+	 *
+	 * @public
+	 * @param {string} message - Error message.
+	 * @param {string} code - Error code.
+	 */
+	constructor(message, code) {
+		super(message);
+
+		this.name = 'VMError';
+		this.code = code;
+
+		thisErrorCaptureStackTrace(this, this.constructor);
+	}
+}
+
+thisGlobalPrototypes['VMError'] = VMError.prototype;
+
+function thisUnexpected() {
+	return new VMError('Unexpected');
+}
+
+if (!thisReflectSetPrototypeOf(exports, null)) throw thisUnexpected();
+
+function thisSafeGetOwnPropertyDescriptor(obj, key) {
+	const desc = thisReflectGetOwnPropertyDescriptor(obj, key);
+	if (!desc) return desc;
+	if (!thisReflectSetPrototypeOf(desc, null)) throw thisUnexpected();
+	return desc;
+}
+
+function thisThrowCallerCalleeArgumentsAccess(key) {
+	'use strict';
+	thisThrowCallerCalleeArgumentsAccess[key];
+	return thisUnexpected();
+}
+
+function thisIdMapping(factory, other) {
+	return other;
+}
+
+const thisThrowOnKeyAccessHandler = thisObjectFreeze({
+	__proto__: null,
+	get(target, key, receiver) {
+		if (typeof key === 'symbol') {
+			key = thisReflectApply(thisSymbolToString, key, []);
+		}
+		throw new VMError(`Unexpected access to key '${key}'`);
+	}
+});
+
+const emptyForzenObject = thisObjectFreeze({
+	__proto__: null
+});
+
+const thisThrowOnKeyAccess = new ThisProxy(emptyForzenObject, thisThrowOnKeyAccessHandler);
+
+function SafeBase() {}
+
+if (!thisReflectDefineProperty(SafeBase, 'prototype', {
+	__proto__: null,
+	value: thisThrowOnKeyAccess
+})) throw thisUnexpected();
+
+function SHARED_FUNCTION() {}
+
+const TEST_PROXY_HANDLER = thisObjectFreeze({
+	__proto__: thisThrowOnKeyAccess,
+	construct() {
+		return this;
+	}
+});
+
+function thisIsConstructor(obj) {
+	// Note: obj@any(unsafe)
+	const Func = new ThisProxy(obj, TEST_PROXY_HANDLER);
+	try {
+		// eslint-disable-next-line no-new
+		new Func();
+		return true;
+	} catch (e) {
+		return false;
+	}
+}
+
+function thisCreateTargetObject(obj, proto) {
+	// Note: obj@any(unsafe) proto@any(unsafe) returns@this(unsafe) throws@this(unsafe)
+	let base;
+	if (typeof obj === 'function') {
+		if (thisIsConstructor(obj)) {
+			// Bind the function since bound functions do not have a prototype property.
+			base = thisReflectApply(thisFunctionBind, SHARED_FUNCTION, [null]);
+		} else {
+			base = () => {};
+		}
+	} else if (thisArrayIsArray(obj)) {
+		base = [];
+	} else {
+		return {__proto__: proto};
+	}
+	if (!thisReflectSetPrototypeOf(base, proto)) throw thisUnexpected();
+	return base;
+}
+
+function createBridge(otherInit, registerProxy) {
+
+	const mappingOtherToThis = new ThisWeakMap();
+	const protoMappings = new ThisMap();
+	const protoName = new ThisMap();
+
+	function thisAddProtoMapping(proto, other, name) {
+		// Note: proto@this(unsafe) other@other(unsafe) name@this(unsafe) throws@this(unsafe)
+		thisReflectApply(thisMapSet, protoMappings, [proto, thisIdMapping]);
+		thisReflectApply(thisMapSet, protoMappings, [other,
+			(factory, object) => thisProxyOther(factory, object, proto)]);
+		if (name) thisReflectApply(thisMapSet, protoName, [proto, name]);
+	}
+
+	function thisAddProtoMappingFactory(protoFactory, other, name) {
+		// Note: protoFactory@this(unsafe) other@other(unsafe) name@this(unsafe) throws@this(unsafe)
+		let proto;
+		thisReflectApply(thisMapSet, protoMappings, [other,
+			(factory, object) => {
+				if (!proto) {
+					proto = protoFactory();
+					thisReflectApply(thisMapSet, protoMappings, [proto, thisIdMapping]);
+					if (name) thisReflectApply(thisMapSet, protoName, [proto, name]);
+				}
+				return thisProxyOther(factory, object, proto);
+			}]);
+	}
+
+	const result = {
+		__proto__: null,
+		globalPrototypes: thisGlobalPrototypes,
+		safeGetOwnPropertyDescriptor: thisSafeGetOwnPropertyDescriptor,
+		fromArguments: thisFromOtherArguments,
+		from: thisFromOther,
+		fromWithFactory: thisFromOtherWithFactory,
+		ensureThis: thisEnsureThis,
+		mapping: mappingOtherToThis,
+		connect: thisConnect,
+		reflectSet: thisReflectSet,
+		reflectGet: thisReflectGet,
+		reflectDefineProperty: thisReflectDefineProperty,
+		reflectDeleteProperty: thisReflectDeleteProperty,
+		reflectApply: thisReflectApply,
+		reflectConstruct: thisReflectConstruct,
+		reflectHas: thisReflectHas,
+		reflectOwnKeys: thisReflectOwnKeys,
+		reflectEnumerate: thisReflectEnumerate,
+		reflectGetPrototypeOf: thisReflectGetPrototypeOf,
+		reflectIsExtensible: thisReflectIsExtensible,
+		reflectPreventExtensions: thisReflectPreventExtensions,
+		objectHasOwnProperty: thisObjectHasOwnProperty,
+		weakMapSet: thisWeakMapSet,
+		addProtoMapping: thisAddProtoMapping,
+		addProtoMappingFactory: thisAddProtoMappingFactory,
+		defaultFactory,
+		protectedFactory,
+		readonlyFactory,
+		VMError
+	};
+
+	const isHost = typeof otherInit !== 'object';
+
+	if (isHost) {
+		otherInit = otherInit(result, registerProxy);
+	}
+
+	result.other = otherInit;
+
+	const {
+		globalPrototypes: otherGlobalPrototypes,
+		safeGetOwnPropertyDescriptor: otherSafeGetOwnPropertyDescriptor,
+		fromArguments: otherFromThisArguments,
+		from: otherFromThis,
+		mapping: mappingThisToOther,
+		reflectSet: otherReflectSet,
+		reflectGet: otherReflectGet,
+		reflectDefineProperty: otherReflectDefineProperty,
+		reflectDeleteProperty: otherReflectDeleteProperty,
+		reflectApply: otherReflectApply,
+		reflectConstruct: otherReflectConstruct,
+		reflectHas: otherReflectHas,
+		reflectOwnKeys: otherReflectOwnKeys,
+		reflectEnumerate: otherReflectEnumerate,
+		reflectGetPrototypeOf: otherReflectGetPrototypeOf,
+		reflectIsExtensible: otherReflectIsExtensible,
+		reflectPreventExtensions: otherReflectPreventExtensions,
+		objectHasOwnProperty: otherObjectHasOwnProperty,
+		weakMapSet: otherWeakMapSet
+	} = otherInit;
+
+	function thisOtherHasOwnProperty(object, key) {
+		// Note: object@other(safe) key@prim throws@this(unsafe)
+		try {
+			return otherReflectApply(otherObjectHasOwnProperty, object, [key]) === true;
+		} catch (e) { // @other(unsafe)
+			throw thisFromOtherForThrow(e);
+		}
+	}
+
+	function thisDefaultGet(handler, object, key, desc) {
+		// Note: object@other(unsafe) key@prim desc@other(safe)
+		let ret; // @other(unsafe)
+		if (desc.get || desc.set) {
+			const getter = desc.get;
+			if (!getter) return undefined;
+			try {
+				ret = otherReflectApply(getter, object, [key]);
+			} catch (e) {
+				throw thisFromOtherForThrow(e);
+			}
+		} else {
+			ret = desc.value;
+		}
+		return handler.fromOtherWithContext(ret);
+	}
+
+	function otherFromThisIfAvailable(to, from, key) {
+		// Note: to@other(safe) from@this(safe) key@prim throws@this(unsafe)
+		if (!thisReflectApply(thisObjectHasOwnProperty, from, [key])) return false;
+		try {
+			to[key] = otherFromThis(from[key]);
+		} catch (e) { // @other(unsafe)
+			throw thisFromOtherForThrow(e);
+		}
+		return true;
+	}
+
+	class BaseHandler extends SafeBase {
+
+		constructor(object) {
+			// Note: object@other(unsafe) throws@this(unsafe)
+			super();
+			this.objectWrapper = () => object;
+		}
+
+		getObject() {
+			return this.objectWrapper();
+		}
+
+		getFactory() {
+			return defaultFactory;
+		}
+
+		fromOtherWithContext(other) {
+			// Note: other@other(unsafe) throws@this(unsafe)
+			return thisFromOtherWithFactory(this.getFactory(), other);
+		}
+
+		doPreventExtensions(target, object, factory) {
+			// Note: target@this(unsafe) object@other(unsafe) throws@this(unsafe)
+			let keys; // @other(safe-array-of-prim)
+			try {
+				keys = otherReflectOwnKeys(object);
+			} catch (e) { // @other(unsafe)
+				throw thisFromOtherForThrow(e);
+			}
+			for (let i = 0; i < keys.length; i++) {
+				const key = keys[i]; // @prim
+				let desc;
+				try {
+					desc = otherSafeGetOwnPropertyDescriptor(object, key);
+				} catch (e) { // @other(unsafe)
+					throw thisFromOtherForThrow(e);
+				}
+				if (!desc) continue;
+				if (!desc.configurable) {
+					const current = thisSafeGetOwnPropertyDescriptor(target, key);
+					if (current && !current.configurable) continue;
+					if (desc.get || desc.set) {
+						desc.get = this.fromOtherWithContext(desc.get);
+						desc.set = this.fromOtherWithContext(desc.set);
+					} else if (typeof object === 'function' && (key === 'caller' || key === 'callee' || key === 'arguments')) {
+						desc.value = null;
+					} else {
+						desc.value = this.fromOtherWithContext(desc.value);
+					}
+				} else {
+					if (desc.get || desc.set) {
+						desc = {
+							__proto__: null,
+							configurable: true,
+							enumerable: desc.enumerable,
+							writable: true,
+							value: null
+						};
+					} else {
+						desc.value = null;
+					}
+				}
+				if (!thisReflectDefineProperty(target, key, desc)) throw thisUnexpected();
+			}
+			if (!thisReflectPreventExtensions(target)) throw thisUnexpected();
+		}
+
+		get(target, key, receiver) {
+			// Note: target@this(unsafe) key@prim receiver@this(unsafe) throws@this(unsafe)
+			const object = this.getObject(); // @other(unsafe)
+			switch (key) {
+				case 'constructor': {
+					const desc = otherSafeGetOwnPropertyDescriptor(object, key);
+					if (desc) return thisDefaultGet(this, object, key, desc);
+					const proto = thisReflectGetPrototypeOf(target);
+					return proto === null ? undefined : proto.constructor;
+				}
+				case '__proto__': {
+					const desc = otherSafeGetOwnPropertyDescriptor(object, key);
+					if (desc) return thisDefaultGet(this, object, key, desc);
+					return thisReflectGetPrototypeOf(target);
+				}
+				case thisSymbolToStringTag:
+					if (!thisOtherHasOwnProperty(object, thisSymbolToStringTag)) {
+						const proto = thisReflectGetPrototypeOf(target);
+						const name = thisReflectApply(thisMapGet, protoName, [proto]);
+						if (name) return name;
+					}
+					break;
+				case 'arguments':
+				case 'caller':
+				case 'callee':
+					if (typeof object === 'function' && thisOtherHasOwnProperty(object, key)) {
+						throw thisThrowCallerCalleeArgumentsAccess(key);
+					}
+					break;
+			}
+			let ret; // @other(unsafe)
+			try {
+				ret = otherReflectGet(object, key);
+			} catch (e) { // @other(unsafe)
+				throw thisFromOtherForThrow(e);
+			}
+			return this.fromOtherWithContext(ret);
+		}
+
+		set(target, key, value, receiver) {
+			// Note: target@this(unsafe) key@prim value@this(unsafe) receiver@this(unsafe) throws@this(unsafe)
+			const object = this.getObject(); // @other(unsafe)
+			if (key === '__proto__' && !thisOtherHasOwnProperty(object, key)) {
+				return this.setPrototypeOf(target, value);
+			}
+			try {
+				value = otherFromThis(value);
+				return otherReflectSet(object, key, value) === true;
+			} catch (e) { // @other(unsafe)
+				throw thisFromOtherForThrow(e);
+			}
+		}
+
+		getPrototypeOf(target) {
+			// Note: target@this(unsafe)
+			return thisReflectGetPrototypeOf(target);
+		}
+
+		setPrototypeOf(target, value) {
+			// Note: target@this(unsafe) throws@this(unsafe)
+			throw new VMError(OPNA);
+		}
+
+		apply(target, context, args) {
+			// Note: target@this(unsafe) context@this(unsafe) args@this(safe-array) throws@this(unsafe)
+			const object = this.getObject(); // @other(unsafe)
+			let ret; // @other(unsafe)
+			try {
+				context = otherFromThis(context);
+				args = otherFromThisArguments(args);
+				ret = otherReflectApply(object, context, args);
+			} catch (e) { // @other(unsafe)
+				throw thisFromOtherForThrow(e);
+			}
+			return thisFromOther(ret);
+		}
+
+		construct(target, args, newTarget) {
+			// Note: target@this(unsafe) args@this(safe-array) newTarget@this(unsafe) throws@this(unsafe)
+			const object = this.getObject(); // @other(unsafe)
+			let ret; // @other(unsafe)
+			try {
+				args = otherFromThisArguments(args);
+				ret = otherReflectConstruct(object, args);
+			} catch (e) { // @other(unsafe)
+				throw thisFromOtherForThrow(e);
+			}
+			return thisFromOtherWithFactory(this.getFactory(), ret, thisFromOther(object));
+		}
+
+		getOwnPropertyDescriptorDesc(target, prop, desc) {
+			// Note: target@this(unsafe) prop@prim desc@other{safe} throws@this(unsafe)
+			const object = this.getObject(); // @other(unsafe)
+			if (desc && typeof object === 'function' && (prop === 'arguments' || prop === 'caller' || prop === 'callee')) desc.value = null;
+			return desc;
+		}
+
+		getOwnPropertyDescriptor(target, prop) {
+			// Note: target@this(unsafe) prop@prim throws@this(unsafe)
+			const object = this.getObject(); // @other(unsafe)
+			let desc; // @other(safe)
+			try {
+				desc = otherSafeGetOwnPropertyDescriptor(object, prop);
+			} catch (e) { // @other(unsafe)
+				throw thisFromOtherForThrow(e);
+			}
+
+			desc = this.getOwnPropertyDescriptorDesc(target, prop, desc);
+
+			if (!desc) return undefined;
+
+			let thisDesc;
+			if (desc.get || desc.set) {
+				thisDesc = {
+					__proto__: null,
+					get: this.fromOtherWithContext(desc.get),
+					set: this.fromOtherWithContext(desc.set),
+					enumerable: desc.enumerable === true,
+					configurable: desc.configurable === true
+				};
+			} else {
+				thisDesc = {
+					__proto__: null,
+					value: this.fromOtherWithContext(desc.value),
+					writable: desc.writable === true,
+					enumerable: desc.enumerable === true,
+					configurable: desc.configurable === true
+				};
+			}
+			if (!thisDesc.configurable) {
+				const oldDesc = thisSafeGetOwnPropertyDescriptor(target, prop);
+				if (!oldDesc || oldDesc.configurable || oldDesc.writable !== thisDesc.writable) {
+					if (!thisReflectDefineProperty(target, prop, thisDesc)) throw thisUnexpected();
+				}
+			}
+			return thisDesc;
+		}
+
+		definePropertyDesc(target, prop, desc) {
+			// Note: target@this(unsafe) prop@prim desc@this(safe) throws@this(unsafe)
+			return desc;
+		}
+
+		defineProperty(target, prop, desc) {
+			// Note: target@this(unsafe) prop@prim desc@this(unsafe) throws@this(unsafe)
+			const object = this.getObject(); // @other(unsafe)
+			if (!thisReflectSetPrototypeOf(desc, null)) throw thisUnexpected();
+
+			desc = this.definePropertyDesc(target, prop, desc);
+
+			if (!desc) return false;
+
+			let otherDesc = {__proto__: null};
+			let hasFunc = true;
+			let hasValue = true;
+			let hasBasic = true;
+			hasFunc &= otherFromThisIfAvailable(otherDesc, desc, 'get');
+			hasFunc &= otherFromThisIfAvailable(otherDesc, desc, 'set');
+			hasValue &= otherFromThisIfAvailable(otherDesc, desc, 'value');
+			hasValue &= otherFromThisIfAvailable(otherDesc, desc, 'writable');
+			hasBasic &= otherFromThisIfAvailable(otherDesc, desc, 'enumerable');
+			hasBasic &= otherFromThisIfAvailable(otherDesc, desc, 'configurable');
+
+			try {
+				if (!otherReflectDefineProperty(object, prop, otherDesc)) return false;
+				if (otherDesc.configurable !== true && (!hasBasic || !(hasFunc || hasValue))) {
+					otherDesc = otherSafeGetOwnPropertyDescriptor(object, prop);
+				}
+			} catch (e) { // @other(unsafe)
+				throw thisFromOtherForThrow(e);
+			}
+
+			if (!otherDesc.configurable) {
+				let thisDesc;
+				if (otherDesc.get || otherDesc.set) {
+					thisDesc = {
+						__proto__: null,
+						get: this.fromOtherWithContext(otherDesc.get),
+						set: this.fromOtherWithContext(otherDesc.set),
+						enumerable: otherDesc.enumerable,
+						configurable: otherDesc.configurable
+					};
+				} else {
+					thisDesc = {
+						__proto__: null,
+						value: this.fromOtherWithContext(otherDesc.value),
+						writable: otherDesc.writable,
+						enumerable: otherDesc.enumerable,
+						configurable: otherDesc.configurable
+					};
+				}
+				if (!thisReflectDefineProperty(target, prop, thisDesc)) throw thisUnexpected();
+			}
+			return true;
+		}
+
+		deleteProperty(target, prop) {
+			// Note: target@this(unsafe) prop@prim throws@this(unsafe)
+			const object = this.getObject(); // @other(unsafe)
+			try {
+				return otherReflectDeleteProperty(object, prop) === true;
+			} catch (e) { // @other(unsafe)
+				throw thisFromOtherForThrow(e);
+			}
+		}
+
+		has(target, key) {
+			// Note: target@this(unsafe) key@prim throws@this(unsafe)
+			const object = this.getObject(); // @other(unsafe)
+			try {
+				return otherReflectHas(object, key) === true;
+			} catch (e) { // @other(unsafe)
+				throw thisFromOtherForThrow(e);
+			}
+		}
+
+		isExtensible(target) {
+			// Note: target@this(unsafe) throws@this(unsafe)
+			const object = this.getObject(); // @other(unsafe)
+			try {
+				if (otherReflectIsExtensible(object)) return true;
+			} catch (e) { // @other(unsafe)
+				throw thisFromOtherForThrow(e);
+			}
+			if (thisReflectIsExtensible(target)) {
+				this.doPreventExtensions(target, object, this);
+			}
+			return false;
+		}
+
+		ownKeys(target) {
+			// Note: target@this(unsafe) throws@this(unsafe)
+			const object = this.getObject(); // @other(unsafe)
+			let res; // @other(unsafe)
+			try {
+				res = otherReflectOwnKeys(object);
+			} catch (e) { // @other(unsafe)
+				throw thisFromOtherForThrow(e);
+			}
+			return thisFromOther(res);
+		}
+
+		preventExtensions(target) {
+			// Note: target@this(unsafe) throws@this(unsafe)
+			const object = this.getObject(); // @other(unsafe)
+			try {
+				if (!otherReflectPreventExtensions(object)) return false;
+			} catch (e) { // @other(unsafe)
+				throw thisFromOtherForThrow(e);
+			}
+			if (thisReflectIsExtensible(target)) {
+				this.doPreventExtensions(target, object, this);
+			}
+			return true;
+		}
+
+		enumerate(target) {
+			// Note: target@this(unsafe) throws@this(unsafe)
+			const object = this.getObject(); // @other(unsafe)
+			let res; // @other(unsafe)
+			try {
+				res = otherReflectEnumerate(object);
+			} catch (e) { // @other(unsafe)
+				throw thisFromOtherForThrow(e);
+			}
+			return this.fromOtherWithContext(res);
+		}
+
+	}
+
+	BaseHandler.prototype[thisSymbolNodeJSUtilInspectCustom] = undefined;
+	BaseHandler.prototype[thisSymbolToStringTag] = 'VM2 Wrapper';
+	BaseHandler.prototype[thisSymbolIterator] = undefined;
+
+	function defaultFactory(object) {
+		// Note: other@other(unsafe) returns@this(unsafe) throws@this(unsafe)
+		return new BaseHandler(object);
+	}
+
+	class ProtectedHandler extends BaseHandler {
+
+		getFactory() {
+			return protectedFactory;
+		}
+
+		set(target, key, value, receiver) {
+			// Note: target@this(unsafe) key@prim value@this(unsafe) receiver@this(unsafe) throws@this(unsafe)
+			if (typeof value === 'function') {
+				return thisReflectDefineProperty(receiver, key, {
+					__proto__: null,
+					value: value,
+					writable: true,
+					enumerable: true,
+					configurable: true
+				}) === true;
+			}
+			return super.set(target, key, value, receiver);
+		}
+
+		definePropertyDesc(target, prop, desc) {
+			// Note: target@this(unsafe) prop@prim desc@this(safe) throws@this(unsafe)
+			if (desc && (desc.set || desc.get || typeof desc.value === 'function')) return undefined;
+			return desc;
+		}
+
+	}
+
+	function protectedFactory(object) {
+		// Note: other@other(unsafe) returns@this(unsafe) throws@this(unsafe)
+		return new ProtectedHandler(object);
+	}
+
+	class ReadOnlyHandler extends BaseHandler {
+
+		getFactory() {
+			return readonlyFactory;
+		}
+
+		set(target, key, value, receiver) {
+			// Note: target@this(unsafe) key@prim value@this(unsafe) receiver@this(unsafe) throws@this(unsafe)
+			return thisReflectDefineProperty(receiver, key, {
+				__proto__: null,
+				value: value,
+				writable: true,
+				enumerable: true,
+				configurable: true
+			});
+		}
+
+		setPrototypeOf(target, value) {
+			// Note: target@this(unsafe) throws@this(unsafe)
+			return false;
+		}
+
+		defineProperty(target, prop, desc) {
+			// Note: target@this(unsafe) prop@prim desc@this(unsafe) throws@this(unsafe)
+			return false;
+		}
+
+		deleteProperty(target, prop) {
+			// Note: target@this(unsafe) prop@prim throws@this(unsafe)
+			return false;
+		}
+
+		isExtensible(target) {
+			// Note: target@this(unsafe) throws@this(unsafe)
+			return false;
+		}
+
+		preventExtensions(target) {
+			// Note: target@this(unsafe) throws@this(unsafe)
+			return false;
+		}
+
+	}
+
+	function readonlyFactory(object) {
+		// Note: other@other(unsafe) returns@this(unsafe) throws@this(unsafe)
+		return new ReadOnlyHandler(object);
+	}
+
+	class ReadOnlyMockHandler extends ReadOnlyHandler {
+
+		constructor(object, mock) {
+			// Note: object@other(unsafe) mock:this(unsafe) throws@this(unsafe)
+			super(object);
+			this.mock = mock;
+		}
+
+		get(target, key, receiver) {
+			// Note: target@this(unsafe) key@prim receiver@this(unsafe) throws@this(unsafe)
+			const object = this.getObject(); // @other(unsafe)
+			const mock = this.mock;
+			if (thisReflectApply(thisObjectHasOwnProperty, mock, key) && !thisOtherHasOwnProperty(object, key)) {
+				return mock[key];
+			}
+			return super.get(target, key, receiver);
+		}
+
+	}
+
+	function thisFromOther(other) {
+		// Note: other@other(unsafe) returns@this(unsafe) throws@this(unsafe)
+		return thisFromOtherWithFactory(defaultFactory, other);
+	}
+
+	function thisProxyOther(factory, other, proto) {
+		const target = thisCreateTargetObject(other, proto);
+		const handler = factory(other);
+		const proxy = new ThisProxy(target, handler);
+		try {
+			otherReflectApply(otherWeakMapSet, mappingThisToOther, [proxy, other]);
+			registerProxy(proxy, handler);
+		} catch (e) {
+			throw new VMError('Unexpected error');
+		}
+		if (!isHost) {
+			thisReflectApply(thisWeakMapSet, mappingOtherToThis, [other, proxy]);
+			return proxy;
+		}
+		const proxy2 = new ThisProxy(proxy, emptyForzenObject);
+		try {
+			otherReflectApply(otherWeakMapSet, mappingThisToOther, [proxy2, other]);
+			registerProxy(proxy2, handler);
+		} catch (e) {
+			throw new VMError('Unexpected error');
+		}
+		thisReflectApply(thisWeakMapSet, mappingOtherToThis, [other, proxy2]);
+		return proxy2;
+	}
+
+	function thisEnsureThis(other) {
+		const type = typeof other;
+		switch (type) {
+			case 'object':
+				if (other === null) {
+					return null;
+				}
+				// fallthrough
+			case 'function':
+				let proto = thisReflectGetPrototypeOf(other);
+				if (!proto) {
+					return other;
+				}
+				while (proto) {
+					const mapping = thisReflectApply(thisMapGet, protoMappings, [proto]);
+					if (mapping) {
+						const mapped = thisReflectApply(thisWeakMapGet, mappingOtherToThis, [other]);
+						if (mapped) return mapped;
+						return mapping(defaultFactory, other);
+					}
+					proto = thisReflectGetPrototypeOf(proto);
+				}
+				return other;
+			case 'undefined':
+			case 'string':
+			case 'number':
+			case 'boolean':
+			case 'symbol':
+			case 'bigint':
+				return other;
+
+			default: // new, unknown types can be dangerous
+				throw new VMError(`Unknown type '${type}'`);
+		}
+	}
+
+	function thisFromOtherForThrow(other) {
+		for (let loop = 0; loop < 10; loop++) {
+			const type = typeof other;
+			switch (type) {
+				case 'object':
+					if (other === null) {
+						return null;
+					}
+					// fallthrough
+				case 'function':
+					const mapped = thisReflectApply(thisWeakMapGet, mappingOtherToThis, [other]);
+					if (mapped) return mapped;
+					let proto;
+					try {
+						proto = otherReflectGetPrototypeOf(other);
+					} catch (e) { // @other(unsafe)
+						other = e;
+						break;
+					}
+					if (!proto) {
+						return thisProxyOther(defaultFactory, other, null);
+					}
+					for (;;) {
+						const mapping = thisReflectApply(thisMapGet, protoMappings, [proto]);
+						if (mapping) return mapping(defaultFactory, other);
+						try {
+							proto = otherReflectGetPrototypeOf(proto);
+						} catch (e) { // @other(unsafe)
+							other = e;
+							break;
+						}
+						if (!proto) return thisProxyOther(defaultFactory, other, thisObjectPrototype);
+					}
+					break;
+				case 'undefined':
+				case 'string':
+				case 'number':
+				case 'boolean':
+				case 'symbol':
+				case 'bigint':
+					return other;
+
+				default: // new, unknown types can be dangerous
+					throw new VMError(`Unknown type '${type}'`);
+			}
+		}
+		throw new VMError('Exception recursion depth');
+	}
+
+	function thisFromOtherWithFactory(factory, other, proto) {
+		const type = typeof other;
+		switch (type) {
+			case 'object':
+				if (other === null) {
+					return null;
+				}
+				// fallthrough
+			case 'function':
+				const mapped = thisReflectApply(thisWeakMapGet, mappingOtherToThis, [other]);
+				if (mapped) return mapped;
+				if (proto) {
+					return thisProxyOther(factory, other, proto);
+				}
+				try {
+					proto = otherReflectGetPrototypeOf(other);
+				} catch (e) { // @other(unsafe)
+					throw thisFromOtherForThrow(e);
+				}
+				if (!proto) {
+					return thisProxyOther(factory, other, null);
+				}
+				do {
+					const mapping = thisReflectApply(thisMapGet, protoMappings, [proto]);
+					if (mapping) return mapping(factory, other);
+					try {
+						proto = otherReflectGetPrototypeOf(proto);
+					} catch (e) { // @other(unsafe)
+						throw thisFromOtherForThrow(e);
+					}
+				} while (proto);
+				return thisProxyOther(factory, other, thisObjectPrototype);
+			case 'undefined':
+			case 'string':
+			case 'number':
+			case 'boolean':
+			case 'symbol':
+			case 'bigint':
+				return other;
+
+			default: // new, unknown types can be dangerous
+				throw new VMError(`Unknown type '${type}'`);
+		}
+	}
+
+	function thisFromOtherArguments(args) {
+		// Note: args@other(safe-array) returns@this(safe-array) throws@this(unsafe)
+		const arr = [];
+		for (let i = 0; i < args.length; i++) {
+			const value = thisFromOther(args[i]);
+			thisReflectDefineProperty(arr, i, {
+				__proto__: null,
+				value: value,
+				writable: true,
+				enumerable: true,
+				configurable: true
+			});
+		}
+		return arr;
+	}
+
+	function thisConnect(obj, other) {
+		// Note: obj@this(unsafe) other@other(unsafe) throws@this(unsafe)
+		try {
+			otherReflectApply(otherWeakMapSet, mappingThisToOther, [obj, other]);
+		} catch (e) {
+			throw new VMError('Unexpected error');
+		}
+		thisReflectApply(thisWeakMapSet, mappingOtherToThis, [other, obj]);
+	}
+
+	thisAddProtoMapping(thisGlobalPrototypes.Object, otherGlobalPrototypes.Object);
+	thisAddProtoMapping(thisGlobalPrototypes.Array, otherGlobalPrototypes.Array);
+
+	for (let i = 0; i < globalsList.length; i++) {
+		const key = globalsList[i];
+		const tp = thisGlobalPrototypes[key];
+		const op = otherGlobalPrototypes[key];
+		if (tp && op) thisAddProtoMapping(tp, op, key);
+	}
+
+	for (let i = 0; i < errorsList.length; i++) {
+		const key = errorsList[i];
+		const tp = thisGlobalPrototypes[key];
+		const op = otherGlobalPrototypes[key];
+		if (tp && op) thisAddProtoMapping(tp, op, 'Error');
+	}
+
+	thisAddProtoMapping(thisGlobalPrototypes.VMError, otherGlobalPrototypes.VMError, 'Error');
+
+	result.BaseHandler = BaseHandler;
+	result.ProtectedHandler = ProtectedHandler;
+	result.ReadOnlyHandler = ReadOnlyHandler;
+	result.ReadOnlyMockHandler = ReadOnlyMockHandler;
+
+	return result;
+}
+
+exports.createBridge = createBridge;
+exports.VMError = VMError;

dist/restore-only/events.js

@@ -0,0 +1,977 @@
+// Copyright Joyent, Inc. and other Node contributors.
+//
+// Permission is hereby granted, free of charge, to any person obtaining a
+// copy of this software and associated documentation files (the
+// "Software"), to deal in the Software without restriction, including
+// without limitation the rights to use, copy, modify, merge, publish,
+// distribute, sublicense, and/or sell copies of the Software, and to permit
+// persons to whom the Software is furnished to do so, subject to the
+// following conditions:
+//
+// The above copyright notice and this permission notice shall be included
+// in all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
+// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
+// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
+// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
+// USE OR OTHER DEALINGS IN THE SOFTWARE.
+
+// Modified by the vm2 team to make this a standalone module to be loaded into the sandbox.
+
+'use strict';
+
+const host = fromhost;
+
+const {
+	Boolean,
+  Error,
+	String,
+	Symbol
+} = globalThis;
+
+const ReflectApply = Reflect.apply;
+const ReflectOwnKeys = Reflect.ownKeys;
+
+const ErrorCaptureStackTrace = Error.captureStackTrace;
+
+const NumberIsNaN = Number.isNaN;
+
+const ObjectCreate = Object.create;
+const ObjectDefineProperty = Object.defineProperty;
+const ObjectDefineProperties = Object.defineProperties;
+const ObjectGetPrototypeOf = Object.getPrototypeOf;
+
+const SymbolFor = Symbol.for;
+
+function uncurryThis(func) {
+	return (thiz, ...args) => ReflectApply(func, thiz, args);
+}
+
+const ArrayPrototypeIndexOf = uncurryThis(Array.prototype.indexOf);
+const ArrayPrototypeJoin = uncurryThis(Array.prototype.join);
+const ArrayPrototypeSlice = uncurryThis(Array.prototype.slice);
+const ArrayPrototypeSplice = uncurryThis(Array.prototype.splice);
+const ArrayPrototypeUnshift = uncurryThis(Array.prototype.unshift);
+
+const kRejection = SymbolFor('nodejs.rejection');
+
+function inspect(obj) {
+	return typeof obj === 'symbol' ? obj.toString() : `${obj}`;
+}
+
+function spliceOne(list, index) {
+	for (; index + 1 < list.length; index++)
+		list[index] = list[index + 1];
+	list.pop();
+}
+
+function assert(what, message) {
+	if (!what) throw new Error(message);
+}
+
+function E(key, msg, Base) {
+	return function NodeError(...args) {
+	  const error = new Base();
+	  const message = ReflectApply(msg, error, args);
+	  ObjectDefineProperties(error, {
+		message: {
+		  value: message,
+		  enumerable: false,
+		  writable: true,
+		  configurable: true,
+		},
+		toString: {
+		  value() {
+			return `${this.name} [${key}]: ${this.message}`;
+		  },
+		  enumerable: false,
+		  writable: true,
+		  configurable: true,
+		},
+	  });
+	  error.code = key;
+	  return error;
+	};
+}
+
+
+const ERR_INVALID_ARG_TYPE = E('ERR_INVALID_ARG_TYPE',
+  (name, expected, actual) => {
+    assert(typeof name === 'string', "'name' must be a string");
+    if (!ArrayIsArray(expected)) {
+      expected = [expected];
+    }
+
+    let msg = 'The ';
+    if (StringPrototypeEndsWith(name, ' argument')) {
+      // For cases like 'first argument'
+      msg += `${name} `;
+    } else {
+      const type = StringPrototypeIncludes(name, '.') ? 'property' : 'argument';
+      msg += `"${name}" ${type} `;
+    }
+    msg += 'must be ';
+
+    const types = [];
+    const instances = [];
+    const other = [];
+
+    for (const value of expected) {
+      assert(typeof value === 'string',
+             'All expected entries have to be of type string');
+      if (ArrayPrototypeIncludes(kTypes, value)) {
+        ArrayPrototypePush(types, StringPrototypeToLowerCase(value));
+      } else if (RegExpPrototypeTest(classRegExp, value)) {
+        ArrayPrototypePush(instances, value);
+      } else {
+        assert(value !== 'object',
+               'The value "object" should be written as "Object"');
+        ArrayPrototypePush(other, value);
+      }
+    }
+
+    // Special handle `object` in case other instances are allowed to outline
+    // the differences between each other.
+    if (instances.length > 0) {
+      const pos = ArrayPrototypeIndexOf(types, 'object');
+      if (pos !== -1) {
+        ArrayPrototypeSplice(types, pos, 1);
+        ArrayPrototypePush(instances, 'Object');
+      }
+    }
+
+    if (types.length > 0) {
+      if (types.length > 2) {
+        const last = ArrayPrototypePop(types);
+        msg += `one of type ${ArrayPrototypeJoin(types, ', ')}, or ${last}`;
+      } else if (types.length === 2) {
+        msg += `one of type ${types[0]} or ${types[1]}`;
+      } else {
+        msg += `of type ${types[0]}`;
+      }
+      if (instances.length > 0 || other.length > 0)
+        msg += ' or ';
+    }
+
+    if (instances.length > 0) {
+      if (instances.length > 2) {
+        const last = ArrayPrototypePop(instances);
+        msg +=
+          `an instance of ${ArrayPrototypeJoin(instances, ', ')}, or ${last}`;
+      } else {
+        msg += `an instance of ${instances[0]}`;
+        if (instances.length === 2) {
+          msg += ` or ${instances[1]}`;
+        }
+      }
+      if (other.length > 0)
+        msg += ' or ';
+    }
+
+    if (other.length > 0) {
+      if (other.length > 2) {
+        const last = ArrayPrototypePop(other);
+        msg += `one of ${ArrayPrototypeJoin(other, ', ')}, or ${last}`;
+      } else if (other.length === 2) {
+        msg += `one of ${other[0]} or ${other[1]}`;
+      } else {
+        if (StringPrototypeToLowerCase(other[0]) !== other[0])
+          msg += 'an ';
+        msg += `${other[0]}`;
+      }
+    }
+
+    if (actual == null) {
+      msg += `. Received ${actual}`;
+    } else if (typeof actual === 'function' && actual.name) {
+      msg += `. Received function ${actual.name}`;
+    } else if (typeof actual === 'object') {
+      if (actual.constructor && actual.constructor.name) {
+        msg += `. Received an instance of ${actual.constructor.name}`;
+      } else {
+        const inspected = inspect(actual, { depth: -1 });
+        msg += `. Received ${inspected}`;
+      }
+    } else {
+      let inspected = inspect(actual, { colors: false });
+      if (inspected.length > 25)
+        inspected = `${StringPrototypeSlice(inspected, 0, 25)}...`;
+      msg += `. Received type ${typeof actual} (${inspected})`;
+    }
+    return msg;
+  }, TypeError);
+
+const ERR_INVALID_THIS = E('ERR_INVALID_THIS', s => `Value of "this" must be of type ${s}`, TypeError);
+
+const ERR_OUT_OF_RANGE = E('ERR_OUT_OF_RANGE',
+  (str, range, input, replaceDefaultBoolean = false) => {
+    assert(range, 'Missing "range" argument');
+    let msg = replaceDefaultBoolean ? str :
+      `The value of "${str}" is out of range.`;
+    const received = inspect(input);
+    msg += ` It must be ${range}. Received ${received}`;
+    return msg;
+  }, RangeError);
+
+const ERR_UNHANDLED_ERROR = E('ERR_UNHANDLED_ERROR',
+  err => {
+    const msg = 'Unhandled error.';
+    if (err === undefined) return msg;
+    return `${msg} (${err})`;
+  }, Error);
+
+function validateBoolean(value, name) {
+  if (typeof value !== 'boolean')
+    throw new ERR_INVALID_ARG_TYPE(name, 'boolean', value);
+}
+
+function validateFunction(value, name) {
+  if (typeof value !== 'function')
+    throw new ERR_INVALID_ARG_TYPE(name, 'Function', value);
+}
+
+function validateString(value, name) {
+  if (typeof value !== 'string')
+    throw new ERR_INVALID_ARG_TYPE(name, 'string', value);
+}
+
+function nc(cond, e) {
+	return cond === undefined || cond === null ? e : cond;
+}
+
+function oc(base, key) {
+	return base === undefined || base === null ? undefined : base[key];
+}
+
+const kCapture = Symbol('kCapture');
+const kErrorMonitor = host.kErrorMonitor || Symbol('events.errorMonitor');
+const kMaxEventTargetListeners = Symbol('events.maxEventTargetListeners');
+const kMaxEventTargetListenersWarned =
+  Symbol('events.maxEventTargetListenersWarned');
+
+const kIsEventTarget = SymbolFor('nodejs.event_target');
+
+function isEventTarget(obj) {
+	return oc(oc(obj, 'constructor'), kIsEventTarget);
+}
+
+/**
+ * Creates a new `EventEmitter` instance.
+ * @param {{ captureRejections?: boolean; }} [opts]
+ * @constructs {EventEmitter}
+ */
+function EventEmitter(opts) {
+  EventEmitter.init.call(this, opts);
+}
+module.exports = EventEmitter;
+if (host.once) module.exports.once = host.once;
+if (host.on) module.exports.on = host.on;
+if (host.getEventListeners) module.exports.getEventListeners = host.getEventListeners;
+// Backwards-compat with node 0.10.x
+EventEmitter.EventEmitter = EventEmitter;
+
+EventEmitter.usingDomains = false;
+
+EventEmitter.captureRejectionSymbol = kRejection;
+ObjectDefineProperty(EventEmitter, 'captureRejections', {
+  get() {
+    return EventEmitter.prototype[kCapture];
+  },
+  set(value) {
+    validateBoolean(value, 'EventEmitter.captureRejections');
+
+    EventEmitter.prototype[kCapture] = value;
+  },
+  enumerable: true
+});
+
+if (host.EventEmitterReferencingAsyncResource) {
+	const kAsyncResource = Symbol('kAsyncResource');
+	const EventEmitterReferencingAsyncResource = host.EventEmitterReferencingAsyncResource;
+
+	class EventEmitterAsyncResource extends EventEmitter {
+		/**
+		 * @param {{
+		 *   name?: string,
+		 *   triggerAsyncId?: number,
+		 *   requireManualDestroy?: boolean,
+		 * }} [options]
+		 */
+		constructor(options = undefined) {
+			let name;
+			if (typeof options === 'string') {
+				name = options;
+				options = undefined;
+			} else {
+				if (new.target === EventEmitterAsyncResource) {
+					validateString(oc(options, 'name'), 'options.name');
+				}
+				name = oc(options, 'name') || new.target.name;
+			}
+			super(options);
+
+			this[kAsyncResource] =
+				new EventEmitterReferencingAsyncResource(this, name, options);
+		}
+
+		/**
+		 * @param {symbol,string} event
+		 * @param  {...any} args
+		 * @returns {boolean}
+		 */
+		emit(event, ...args) {
+			if (this[kAsyncResource] === undefined)
+				throw new ERR_INVALID_THIS('EventEmitterAsyncResource');
+			const { asyncResource } = this;
+			ArrayPrototypeUnshift(args, super.emit, this, event);
+			return ReflectApply(asyncResource.runInAsyncScope, asyncResource,
+													args);
+		}
+
+		/**
+		 * @returns {void}
+		 */
+		emitDestroy() {
+			if (this[kAsyncResource] === undefined)
+				throw new ERR_INVALID_THIS('EventEmitterAsyncResource');
+			this.asyncResource.emitDestroy();
+		}
+
+		/**
+		 * @type {number}
+		 */
+		get asyncId() {
+			if (this[kAsyncResource] === undefined)
+				throw new ERR_INVALID_THIS('EventEmitterAsyncResource');
+			return this.asyncResource.asyncId();
+		}
+
+		/**
+		 * @type {number}
+		 */
+		get triggerAsyncId() {
+			if (this[kAsyncResource] === undefined)
+				throw new ERR_INVALID_THIS('EventEmitterAsyncResource');
+			return this.asyncResource.triggerAsyncId();
+		}
+
+		/**
+		 * @type {EventEmitterReferencingAsyncResource}
+		 */
+		get asyncResource() {
+			if (this[kAsyncResource] === undefined)
+				throw new ERR_INVALID_THIS('EventEmitterAsyncResource');
+			return this[kAsyncResource];
+		}
+	}
+	EventEmitter.EventEmitterAsyncResource = EventEmitterAsyncResource;
+}
+
+EventEmitter.errorMonitor = kErrorMonitor;
+
+// The default for captureRejections is false
+ObjectDefineProperty(EventEmitter.prototype, kCapture, {
+  value: false,
+  writable: true,
+  enumerable: false
+});
+
+EventEmitter.prototype._events = undefined;
+EventEmitter.prototype._eventsCount = 0;
+EventEmitter.prototype._maxListeners = undefined;
+
+// By default EventEmitters will print a warning if more than 10 listeners are
+// added to it. This is a useful default which helps finding memory leaks.
+let defaultMaxListeners = 10;
+
+function checkListener(listener) {
+  validateFunction(listener, 'listener');
+}
+
+ObjectDefineProperty(EventEmitter, 'defaultMaxListeners', {
+  enumerable: true,
+  get: function() {
+    return defaultMaxListeners;
+  },
+  set: function(arg) {
+    if (typeof arg !== 'number' || arg < 0 || NumberIsNaN(arg)) {
+      throw new ERR_OUT_OF_RANGE('defaultMaxListeners',
+                                 'a non-negative number',
+                                 arg);
+    }
+    defaultMaxListeners = arg;
+  }
+});
+
+ObjectDefineProperties(EventEmitter, {
+  kMaxEventTargetListeners: {
+    value: kMaxEventTargetListeners,
+    enumerable: false,
+    configurable: false,
+    writable: false,
+  },
+  kMaxEventTargetListenersWarned: {
+    value: kMaxEventTargetListenersWarned,
+    enumerable: false,
+    configurable: false,
+    writable: false,
+  }
+});
+
+/**
+ * Sets the max listeners.
+ * @param {number} n
+ * @param {EventTarget[] | EventEmitter[]} [eventTargets]
+ * @returns {void}
+ */
+EventEmitter.setMaxListeners =
+  function(n = defaultMaxListeners, ...eventTargets) {
+    if (typeof n !== 'number' || n < 0 || NumberIsNaN(n))
+      throw new ERR_OUT_OF_RANGE('n', 'a non-negative number', n);
+    if (eventTargets.length === 0) {
+      defaultMaxListeners = n;
+    } else {
+      for (let i = 0; i < eventTargets.length; i++) {
+        const target = eventTargets[i];
+        if (isEventTarget(target)) {
+          target[kMaxEventTargetListeners] = n;
+          target[kMaxEventTargetListenersWarned] = false;
+        } else if (typeof target.setMaxListeners === 'function') {
+          target.setMaxListeners(n);
+        } else {
+          throw new ERR_INVALID_ARG_TYPE(
+            'eventTargets',
+            ['EventEmitter', 'EventTarget'],
+            target);
+        }
+      }
+    }
+  };
+
+// If you're updating this function definition, please also update any
+// re-definitions, such as the one in the Domain module (lib/domain.js).
+EventEmitter.init = function(opts) {
+
+  if (this._events === undefined ||
+      this._events === ObjectGetPrototypeOf(this)._events) {
+    this._events = ObjectCreate(null);
+    this._eventsCount = 0;
+  }
+
+  this._maxListeners = this._maxListeners || undefined;
+
+
+  if (oc(opts, 'captureRejections')) {
+    validateBoolean(opts.captureRejections, 'options.captureRejections');
+    this[kCapture] = Boolean(opts.captureRejections);
+  } else {
+    // Assigning the kCapture property directly saves an expensive
+    // prototype lookup in a very sensitive hot path.
+    this[kCapture] = EventEmitter.prototype[kCapture];
+  }
+};
+
+function addCatch(that, promise, type, args) {
+  if (!that[kCapture]) {
+    return;
+  }
+
+  // Handle Promises/A+ spec, then could be a getter
+  // that throws on second use.
+  try {
+    const then = promise.then;
+
+    if (typeof then === 'function') {
+      then.call(promise, undefined, function(err) {
+        // The callback is called with nextTick to avoid a follow-up
+        // rejection from this promise.
+        process.nextTick(emitUnhandledRejectionOrErr, that, err, type, args);
+      });
+    }
+  } catch (err) {
+    that.emit('error', err);
+  }
+}
+
+function emitUnhandledRejectionOrErr(ee, err, type, args) {
+  if (typeof ee[kRejection] === 'function') {
+    ee[kRejection](err, type, ...args);
+  } else {
+    // We have to disable the capture rejections mechanism, otherwise
+    // we might end up in an infinite loop.
+    const prev = ee[kCapture];
+
+    // If the error handler throws, it is not catchable and it
+    // will end up in 'uncaughtException'. We restore the previous
+    // value of kCapture in case the uncaughtException is present
+    // and the exception is handled.
+    try {
+      ee[kCapture] = false;
+      ee.emit('error', err);
+    } finally {
+      ee[kCapture] = prev;
+    }
+  }
+}
+
+/**
+ * Increases the max listeners of the event emitter.
+ * @param {number} n
+ * @returns {EventEmitter}
+ */
+EventEmitter.prototype.setMaxListeners = function setMaxListeners(n) {
+  if (typeof n !== 'number' || n < 0 || NumberIsNaN(n)) {
+    throw new ERR_OUT_OF_RANGE('n', 'a non-negative number', n);
+  }
+  this._maxListeners = n;
+  return this;
+};
+
+function _getMaxListeners(that) {
+  if (that._maxListeners === undefined)
+    return EventEmitter.defaultMaxListeners;
+  return that._maxListeners;
+}
+
+/**
+ * Returns the current max listener value for the event emitter.
+ * @returns {number}
+ */
+EventEmitter.prototype.getMaxListeners = function getMaxListeners() {
+  return _getMaxListeners(this);
+};
+
+/**
+ * Synchronously calls each of the listeners registered
+ * for the event.
+ * @param {string | symbol} type
+ * @param {...any} [args]
+ * @returns {boolean}
+ */
+EventEmitter.prototype.emit = function emit(type, ...args) {
+  let doError = (type === 'error');
+
+  const events = this._events;
+  if (events !== undefined) {
+    if (doError && events[kErrorMonitor] !== undefined)
+      this.emit(kErrorMonitor, ...args);
+    doError = (doError && events.error === undefined);
+  } else if (!doError)
+    return false;
+
+  // If there is no 'error' event listener then throw.
+  if (doError) {
+    let er;
+    if (args.length > 0)
+      er = args[0];
+    if (er instanceof Error) {
+      try {
+        const capture = {};
+        ErrorCaptureStackTrace(capture, EventEmitter.prototype.emit);
+      } catch (e) {}
+
+      // Note: The comments on the `throw` lines are intentional, they show
+      // up in Node's output if this results in an unhandled exception.
+      throw er; // Unhandled 'error' event
+    }
+
+    let stringifiedEr;
+    try {
+      stringifiedEr = inspect(er);
+    } catch (e) {
+      stringifiedEr = er;
+    }
+
+    // At least give some kind of context to the user
+    const err = new ERR_UNHANDLED_ERROR(stringifiedEr);
+    err.context = er;
+    throw err; // Unhandled 'error' event
+  }
+
+  const handler = events[type];
+
+  if (handler === undefined)
+    return false;
+
+  if (typeof handler === 'function') {
+    const result = handler.apply(this, args);
+
+    // We check if result is undefined first because that
+    // is the most common case so we do not pay any perf
+    // penalty
+    if (result !== undefined && result !== null) {
+      addCatch(this, result, type, args);
+    }
+  } else {
+    const len = handler.length;
+    const listeners = arrayClone(handler);
+    for (let i = 0; i < len; ++i) {
+      const result = listeners[i].apply(this, args);
+
+      // We check if result is undefined first because that
+      // is the most common case so we do not pay any perf
+      // penalty.
+      // This code is duplicated because extracting it away
+      // would make it non-inlineable.
+      if (result !== undefined && result !== null) {
+        addCatch(this, result, type, args);
+      }
+    }
+  }
+
+  return true;
+};
+
+function _addListener(target, type, listener, prepend) {
+  let m;
+  let events;
+  let existing;
+
+  checkListener(listener);
+
+  events = target._events;
+  if (events === undefined) {
+    events = target._events = ObjectCreate(null);
+    target._eventsCount = 0;
+  } else {
+    // To avoid recursion in the case that type === "newListener"! Before
+    // adding it to the listeners, first emit "newListener".
+    if (events.newListener !== undefined) {
+      target.emit('newListener', type,
+                  nc(listener.listener, listener));
+
+      // Re-assign `events` because a newListener handler could have caused the
+      // this._events to be assigned to a new object
+      events = target._events;
+    }
+    existing = events[type];
+  }
+
+  if (existing === undefined) {
+    // Optimize the case of one listener. Don't need the extra array object.
+    events[type] = listener;
+    ++target._eventsCount;
+  } else {
+    if (typeof existing === 'function') {
+      // Adding the second element, need to change to array.
+      existing = events[type] =
+        prepend ? [listener, existing] : [existing, listener];
+      // If we've already got an array, just append.
+    } else if (prepend) {
+      existing.unshift(listener);
+    } else {
+      existing.push(listener);
+    }
+
+    // Check for listener leak
+    m = _getMaxListeners(target);
+    if (m > 0 && existing.length > m && !existing.warned) {
+      existing.warned = true;
+      // No error code for this since it is a Warning
+      // eslint-disable-next-line no-restricted-syntax
+      const w = new Error('Possible EventEmitter memory leak detected. ' +
+                          `${existing.length} ${String(type)} listeners ` +
+                          `added to ${inspect(target, { depth: -1 })}. Use ` +
+                          'emitter.setMaxListeners() to increase limit');
+      w.name = 'MaxListenersExceededWarning';
+      w.emitter = target;
+      w.type = type;
+      w.count = existing.length;
+      process.emitWarning(w);
+    }
+  }
+
+  return target;
+}
+
+/**
+ * Adds a listener to the event emitter.
+ * @param {string | symbol} type
+ * @param {Function} listener
+ * @returns {EventEmitter}
+ */
+EventEmitter.prototype.addListener = function addListener(type, listener) {
+  return _addListener(this, type, listener, false);
+};
+
+EventEmitter.prototype.on = EventEmitter.prototype.addListener;
+
+/**
+ * Adds the `listener` function to the beginning of
+ * the listeners array.
+ * @param {string | symbol} type
+ * @param {Function} listener
+ * @returns {EventEmitter}
+ */
+EventEmitter.prototype.prependListener =
+    function prependListener(type, listener) {
+      return _addListener(this, type, listener, true);
+    };
+
+function onceWrapper() {
+  if (!this.fired) {
+    this.target.removeListener(this.type, this.wrapFn);
+    this.fired = true;
+    if (arguments.length === 0)
+      return this.listener.call(this.target);
+    return this.listener.apply(this.target, arguments);
+  }
+}
+
+function _onceWrap(target, type, listener) {
+  const state = { fired: false, wrapFn: undefined, target, type, listener };
+  const wrapped = onceWrapper.bind(state);
+  wrapped.listener = listener;
+  state.wrapFn = wrapped;
+  return wrapped;
+}
+
+/**
+ * Adds a one-time `listener` function to the event emitter.
+ * @param {string | symbol} type
+ * @param {Function} listener
+ * @returns {EventEmitter}
+ */
+EventEmitter.prototype.once = function once(type, listener) {
+  checkListener(listener);
+
+  this.on(type, _onceWrap(this, type, listener));
+  return this;
+};
+
+/**
+ * Adds a one-time `listener` function to the beginning of
+ * the listeners array.
+ * @param {string | symbol} type
+ * @param {Function} listener
+ * @returns {EventEmitter}
+ */
+EventEmitter.prototype.prependOnceListener =
+    function prependOnceListener(type, listener) {
+      checkListener(listener);
+
+      this.prependListener(type, _onceWrap(this, type, listener));
+      return this;
+    };
+
+
+/**
+ * Removes the specified `listener` from the listeners array.
+ * @param {string | symbol} type
+ * @param {Function} listener
+ * @returns {EventEmitter}
+ */
+EventEmitter.prototype.removeListener =
+    function removeListener(type, listener) {
+      checkListener(listener);
+
+      const events = this._events;
+      if (events === undefined)
+        return this;
+
+      const list = events[type];
+      if (list === undefined)
+        return this;
+
+      if (list === listener || list.listener === listener) {
+        if (--this._eventsCount === 0)
+          this._events = ObjectCreate(null);
+        else {
+          delete events[type];
+          if (events.removeListener)
+            this.emit('removeListener', type, list.listener || listener);
+        }
+      } else if (typeof list !== 'function') {
+        let position = -1;
+
+        for (let i = list.length - 1; i >= 0; i--) {
+          if (list[i] === listener || list[i].listener === listener) {
+            position = i;
+            break;
+          }
+        }
+
+        if (position < 0)
+          return this;
+
+        if (position === 0)
+          list.shift();
+        else {
+          spliceOne(list, position);
+        }
+
+        if (list.length === 1)
+          events[type] = list[0];
+
+        if (events.removeListener !== undefined)
+          this.emit('removeListener', type, listener);
+      }
+
+      return this;
+    };
+
+EventEmitter.prototype.off = EventEmitter.prototype.removeListener;
+
+/**
+ * Removes all listeners from the event emitter. (Only
+ * removes listeners for a specific event name if specified
+ * as `type`).
+ * @param {string | symbol} [type]
+ * @returns {EventEmitter}
+ */
+EventEmitter.prototype.removeAllListeners =
+    function removeAllListeners(type) {
+      const events = this._events;
+      if (events === undefined)
+        return this;
+
+      // Not listening for removeListener, no need to emit
+      if (events.removeListener === undefined) {
+        if (arguments.length === 0) {
+          this._events = ObjectCreate(null);
+          this._eventsCount = 0;
+        } else if (events[type] !== undefined) {
+          if (--this._eventsCount === 0)
+            this._events = ObjectCreate(null);
+          else
+            delete events[type];
+        }
+        return this;
+      }
+
+      // Emit removeListener for all listeners on all events
+      if (arguments.length === 0) {
+        for (const key of ReflectOwnKeys(events)) {
+          if (key === 'removeListener') continue;
+          this.removeAllListeners(key);
+        }
+        this.removeAllListeners('removeListener');
+        this._events = ObjectCreate(null);
+        this._eventsCount = 0;
+        return this;
+      }
+
+      const listeners = events[type];
+
+      if (typeof listeners === 'function') {
+        this.removeListener(type, listeners);
+      } else if (listeners !== undefined) {
+        // LIFO order
+        for (let i = listeners.length - 1; i >= 0; i--) {
+          this.removeListener(type, listeners[i]);
+        }
+      }
+
+      return this;
+    };
+
+function _listeners(target, type, unwrap) {
+  const events = target._events;
+
+  if (events === undefined)
+    return [];
+
+  const evlistener = events[type];
+  if (evlistener === undefined)
+    return [];
+
+  if (typeof evlistener === 'function')
+    return unwrap ? [evlistener.listener || evlistener] : [evlistener];
+
+  return unwrap ?
+    unwrapListeners(evlistener) : arrayClone(evlistener);
+}
+
+/**
+ * Returns a copy of the array of listeners for the event name
+ * specified as `type`.
+ * @param {string | symbol} type
+ * @returns {Function[]}
+ */
+EventEmitter.prototype.listeners = function listeners(type) {
+  return _listeners(this, type, true);
+};
+
+/**
+ * Returns a copy of the array of listeners and wrappers for
+ * the event name specified as `type`.
+ * @param {string | symbol} type
+ * @returns {Function[]}
+ */
+EventEmitter.prototype.rawListeners = function rawListeners(type) {
+  return _listeners(this, type, false);
+};
+
+/**
+ * Returns the number of listeners listening to the event name
+ * specified as `type`.
+ * @deprecated since v3.2.0
+ * @param {EventEmitter} emitter
+ * @param {string | symbol} type
+ * @returns {number}
+ */
+EventEmitter.listenerCount = function(emitter, type) {
+  if (typeof emitter.listenerCount === 'function') {
+    return emitter.listenerCount(type);
+  }
+  return emitter.listenerCount(type);
+};
+
+EventEmitter.prototype.listenerCount = listenerCount;
+
+/**
+ * Returns the number of listeners listening to event name
+ * specified as `type`.
+ * @param {string | symbol} type
+ * @returns {number}
+ */
+function listenerCount(type) {
+  const events = this._events;
+
+  if (events !== undefined) {
+    const evlistener = events[type];
+
+    if (typeof evlistener === 'function') {
+      return 1;
+    } else if (evlistener !== undefined) {
+      return evlistener.length;
+    }
+  }
+
+  return 0;
+}
+
+/**
+ * Returns an array listing the events for which
+ * the emitter has registered listeners.
+ * @returns {any[]}
+ */
+EventEmitter.prototype.eventNames = function eventNames() {
+  return this._eventsCount > 0 ? ReflectOwnKeys(this._events) : [];
+};
+
+function arrayClone(arr) {
+  // At least since V8 8.3, this implementation is faster than the previous
+  // which always used a simple for-loop
+  switch (arr.length) {
+    case 2: return [arr[0], arr[1]];
+    case 3: return [arr[0], arr[1], arr[2]];
+    case 4: return [arr[0], arr[1], arr[2], arr[3]];
+    case 5: return [arr[0], arr[1], arr[2], arr[3], arr[4]];
+    case 6: return [arr[0], arr[1], arr[2], arr[3], arr[4], arr[5]];
+  }
+  return ArrayPrototypeSlice(arr);
+}
+
+function unwrapListeners(arr) {
+  const ret = arrayClone(arr);
+  for (let i = 0; i < ret.length; ++i) {
+    const orig = ret[i].listener;
+    if (typeof orig === 'function')
+      ret[i] = orig;
+  }
+  return ret;
+}

dist/restore-only/setup-node-sandbox.js

@@ -0,0 +1,469 @@
+/* global host, data, VMError */
+
+'use strict';
+
+const LocalError = Error;
+const LocalTypeError = TypeError;
+const LocalWeakMap = WeakMap;
+
+const {
+	apply: localReflectApply,
+	defineProperty: localReflectDefineProperty
+} = Reflect;
+
+const {
+	set: localWeakMapSet,
+	get: localWeakMapGet
+} = LocalWeakMap.prototype;
+
+const {
+	isArray: localArrayIsArray
+} = Array;
+
+function uncurryThis(func) {
+	return (thiz, ...args) => localReflectApply(func, thiz, args);
+}
+
+const localArrayPrototypeSlice = uncurryThis(Array.prototype.slice);
+const localArrayPrototypeIncludes = uncurryThis(Array.prototype.includes);
+const localArrayPrototypePush = uncurryThis(Array.prototype.push);
+const localArrayPrototypeIndexOf = uncurryThis(Array.prototype.indexOf);
+const localArrayPrototypeSplice = uncurryThis(Array.prototype.splice);
+const localStringPrototypeStartsWith = uncurryThis(String.prototype.startsWith);
+const localStringPrototypeSlice = uncurryThis(String.prototype.slice);
+const localStringPrototypeIndexOf = uncurryThis(String.prototype.indexOf);
+
+const {
+	argv: optionArgv,
+	env: optionEnv,
+	console: optionConsole,
+	vm,
+	resolver,
+	extensions
+} = data;
+
+function ensureSandboxArray(a) {
+	return localArrayPrototypeSlice(a);
+}
+
+const globalPaths = ensureSandboxArray(resolver.globalPaths);
+
+class Module {
+
+	constructor(id, path, parent) {
+		this.id = id;
+		this.filename = id;
+		this.path = path;
+		this.parent = parent;
+		this.loaded = false;
+		this.paths = path ? ensureSandboxArray(resolver.genLookupPaths(path)) : [];
+		this.children = [];
+		this.exports = {};
+	}
+
+	_updateChildren(child, isNew) {
+		const children = this.children;
+		if (children && (isNew || !localArrayPrototypeIncludes(children, child))) {
+			localArrayPrototypePush(children, child);
+		}
+	}
+
+	require(id) {
+		return requireImpl(this, id, false);
+	}
+
+}
+
+const originalRequire = Module.prototype.require;
+const cacheBuiltins = {__proto__: null};
+
+function requireImpl(mod, id, direct) {
+	if (direct && mod.require !== originalRequire) {
+		return mod.require(id);
+	}
+	const filename = resolver.resolve(mod, id, undefined, Module._extensions, direct);
+	if (localStringPrototypeStartsWith(filename, 'node:')) {
+		id = localStringPrototypeSlice(filename, 5);
+		let nmod = cacheBuiltins[id];
+		if (!nmod) {
+			nmod = resolver.loadBuiltinModule(vm, id);
+			if (!nmod) throw new VMError(`Cannot find module '${filename}'`, 'ENOTFOUND');
+			cacheBuiltins[id] = nmod;
+		}
+		return nmod;
+	}
+
+	const cachedModule = Module._cache[filename];
+	if (cachedModule !== undefined) {
+		mod._updateChildren(cachedModule, false);
+		return cachedModule.exports;
+	}
+
+	let nmod = cacheBuiltins[id];
+	if (nmod) return nmod;
+	nmod = resolver.loadBuiltinModule(vm, id);
+	if (nmod) {
+		cacheBuiltins[id] = nmod;
+		return nmod;
+	}
+
+	const path = resolver.fs.dirname(filename);
+	const module = new Module(filename, path, mod);
+	resolver.registerModule(module, filename, path, mod, direct);
+	mod._updateChildren(module, true);
+	try {
+		Module._cache[filename] = module;
+		const handler = findBestExtensionHandler(filename);
+		handler(module, filename);
+		module.loaded = true;
+	} catch (e) {
+		delete Module._cache[filename];
+		const children = mod.children;
+		if (localArrayIsArray(children)) {
+			const index = localArrayPrototypeIndexOf(children, module);
+			if (index !== -1) {
+				localArrayPrototypeSplice(children, index, 1);
+			}
+		}
+		throw e;
+	}
+
+	return module.exports;
+}
+
+Module.builtinModules = ensureSandboxArray(resolver.getBuiltinModulesList());
+Module.globalPaths = globalPaths;
+Module._extensions = {__proto__: null};
+Module._cache = {__proto__: null};
+
+{
+	const keys = Object.getOwnPropertyNames(extensions);
+	for (let i = 0; i < keys.length; i++) {
+		const key = keys[i];
+		const handler = extensions[key];
+		Module._extensions[key] = (mod, filename) => handler(mod, filename);
+	}
+}
+
+function findBestExtensionHandler(filename) {
+	const name = resolver.fs.basename(filename);
+	for (let i = 0; (i = localStringPrototypeIndexOf(name, '.', i + 1)) !== -1;) {
+		const ext = localStringPrototypeSlice(name, i);
+		const handler = Module._extensions[ext];
+		if (handler) return handler;
+	}
+	const js = Module._extensions['.js'];
+	if (js) return js;
+	const keys = Object.getOwnPropertyNames(Module._extensions);
+	if (keys.length === 0) throw new VMError(`Failed to load '${filename}': Unknown type.`, 'ELOADFAIL');
+	return Module._extensions[keys[0]];
+}
+
+function createRequireForModule(mod) {
+	// eslint-disable-next-line no-shadow
+	function require(id) {
+		return requireImpl(mod, id, true);
+	}
+	function resolve(id, options) {
+		return resolver.resolve(mod, id, options, Module._extensions, true);
+	}
+	require.resolve = resolve;
+	function paths(id) {
+		return ensureSandboxArray(resolver.lookupPaths(mod, id));
+	}
+	resolve.paths = paths;
+
+	require.extensions = Module._extensions;
+
+	require.cache = Module._cache;
+
+	return require;
+}
+
+/**
+ * Prepare sandbox.
+ */
+
+const TIMERS = new LocalWeakMap();
+
+class Timeout {
+}
+
+class Interval {
+}
+
+class Immediate {
+}
+
+function clearTimer(timer) {
+	const obj = localReflectApply(localWeakMapGet, TIMERS, [timer]);
+	if (obj) {
+		obj.clear(obj.value);
+	}
+}
+
+// This is a function and not an arrow function, since the original is also a function
+// eslint-disable-next-line no-shadow
+global.setTimeout = function setTimeout(callback, delay, ...args) {
+	if (typeof callback !== 'function') throw new LocalTypeError('"callback" argument must be a function');
+	const obj = new Timeout(callback, args);
+	const cb = () => {
+		localReflectApply(callback, null, args);
+	};
+	const tmr = host.setTimeout(cb, delay);
+
+	const ref = {
+		__proto__: null,
+		clear: host.clearTimeout,
+		value: tmr
+	};
+
+	localReflectApply(localWeakMapSet, TIMERS, [obj, ref]);
+	return obj;
+};
+
+// eslint-disable-next-line no-shadow
+global.setInterval = function setInterval(callback, interval, ...args) {
+	if (typeof callback !== 'function') throw new LocalTypeError('"callback" argument must be a function');
+	const obj = new Interval();
+	const cb = () => {
+		localReflectApply(callback, null, args);
+	};
+	const tmr = host.setInterval(cb, interval);
+
+	const ref = {
+		__proto__: null,
+		clear: host.clearInterval,
+		value: tmr
+	};
+
+	localReflectApply(localWeakMapSet, TIMERS, [obj, ref]);
+	return obj;
+};
+
+// eslint-disable-next-line no-shadow
+global.setImmediate = function setImmediate(callback, ...args) {
+	if (typeof callback !== 'function') throw new LocalTypeError('"callback" argument must be a function');
+	const obj = new Immediate();
+	const cb = () => {
+		localReflectApply(callback, null, args);
+	};
+	const tmr = host.setImmediate(cb);
+
+	const ref = {
+		__proto__: null,
+		clear: host.clearImmediate,
+		value: tmr
+	};
+
+	localReflectApply(localWeakMapSet, TIMERS, [obj, ref]);
+	return obj;
+};
+
+// eslint-disable-next-line no-shadow
+global.clearTimeout = function clearTimeout(timeout) {
+	clearTimer(timeout);
+};
+
+// eslint-disable-next-line no-shadow
+global.clearInterval = function clearInterval(interval) {
+	clearTimer(interval);
+};
+
+// eslint-disable-next-line no-shadow
+global.clearImmediate = function clearImmediate(immediate) {
+	clearTimer(immediate);
+};
+
+const localProcess = host.process;
+
+function vmEmitArgs(event, args) {
+	const allargs = [event];
+	for (let i = 0; i < args.length; i++) {
+		if (!localReflectDefineProperty(allargs, i + 1, {
+			__proto__: null,
+			value: args[i],
+			writable: true,
+			enumerable: true,
+			configurable: true
+		})) throw new LocalError('Unexpected');
+	}
+	return localReflectApply(vm.emit, vm, allargs);
+}
+
+const LISTENERS = new LocalWeakMap();
+const LISTENER_HANDLER = new LocalWeakMap();
+
+/**
+ *
+ * @param {*} name
+ * @param {*} handler
+ * @this process
+ * @return {this}
+ */
+function addListener(name, handler) {
+	if (name !== 'beforeExit' && name !== 'exit') {
+		throw new LocalError(`Access denied to listen for '${name}' event.`);
+	}
+
+	let cb = localReflectApply(localWeakMapGet, LISTENERS, [handler]);
+	if (!cb) {
+		cb = () => {
+			handler();
+		};
+		localReflectApply(localWeakMapSet, LISTENER_HANDLER, [cb, handler]);
+		localReflectApply(localWeakMapSet, LISTENERS, [handler, cb]);
+	}
+
+	localProcess.on(name, cb);
+
+	return this;
+}
+
+/**
+ *
+ * @this process
+ * @return {this}
+ */
+// eslint-disable-next-line no-shadow
+function process() {
+	return this;
+}
+
+const baseUptime = localProcess.uptime();
+
+// FIXME wrong class structure
+global.process = {
+	__proto__: process.prototype,
+	argv: optionArgv !== undefined ? optionArgv : [],
+	title: localProcess.title,
+	version: localProcess.version,
+	versions: localProcess.versions,
+	arch: localProcess.arch,
+	platform: localProcess.platform,
+	env: optionEnv !== undefined ? optionEnv : {},
+	pid: localProcess.pid,
+	features: localProcess.features,
+	nextTick: function nextTick(callback, ...args) {
+		if (typeof callback !== 'function') {
+			throw new LocalError('Callback must be a function.');
+		}
+
+		localProcess.nextTick(()=>{
+			localReflectApply(callback, null, args);
+		});
+	},
+	hrtime: function hrtime(time) {
+		return localProcess.hrtime(time);
+	},
+	uptime: function uptime() {
+		return localProcess.uptime() - baseUptime;
+	},
+	cwd: function cwd() {
+		return localProcess.cwd();
+	},
+	addListener,
+	on: addListener,
+
+	once: function once(name, handler) {
+		if (name !== 'beforeExit' && name !== 'exit') {
+			throw new LocalError(`Access denied to listen for '${name}' event.`);
+		}
+
+		let triggered = false;
+		const cb = () => {
+			if (triggered) return;
+			triggered = true;
+			localProcess.removeListener(name, cb);
+			handler();
+		};
+		localReflectApply(localWeakMapSet, LISTENER_HANDLER, [cb, handler]);
+
+		localProcess.on(name, cb);
+
+		return this;
+	},
+
+	listeners: function listeners(name) {
+		if (name !== 'beforeExit' && name !== 'exit') {
+			// Maybe add ({__proto__:null})[name] to throw when name fails in https://tc39.es/ecma262/#sec-topropertykey.
+			return [];
+		}
+
+		// Filter out listeners, which were not created in this sandbox
+		const all = localProcess.listeners(name);
+		const filtered = [];
+		let j = 0;
+		for (let i = 0; i < all.length; i++) {
+			const h = localReflectApply(localWeakMapGet, LISTENER_HANDLER, [all[i]]);
+			if (h) {
+				if (!localReflectDefineProperty(filtered, j, {
+					__proto__: null,
+					value: h,
+					writable: true,
+					enumerable: true,
+					configurable: true
+				})) throw new LocalError('Unexpected');
+				j++;
+			}
+		}
+		return filtered;
+	},
+
+	removeListener: function removeListener(name, handler) {
+		if (name !== 'beforeExit' && name !== 'exit') {
+			return this;
+		}
+
+		const cb = localReflectApply(localWeakMapGet, LISTENERS, [handler]);
+		if (cb) localProcess.removeListener(name, cb);
+
+		return this;
+	},
+
+	umask: function umask() {
+		if (arguments.length) {
+			throw new LocalError('Access denied to set umask.');
+		}
+
+		return localProcess.umask();
+	}
+};
+
+if (optionConsole === 'inherit') {
+	global.console = host.console;
+} else if (optionConsole === 'redirect') {
+	global.console = {
+		debug(...args) {
+			vmEmitArgs('console.debug', args);
+		},
+		log(...args) {
+			vmEmitArgs('console.log', args);
+		},
+		info(...args) {
+			vmEmitArgs('console.info', args);
+		},
+		warn(...args) {
+			vmEmitArgs('console.warn', args);
+		},
+		error(...args) {
+			vmEmitArgs('console.error', args);
+		},
+		dir(...args) {
+			vmEmitArgs('console.dir', args);
+		},
+		time() {},
+		timeEnd() {},
+		trace(...args) {
+			vmEmitArgs('console.trace', args);
+		}
+	};
+}
+
+return {
+	__proto__: null,
+	Module,
+	jsonParse: JSON.parse,
+	createRequireForModule,
+	requireImpl
+};

dist/restore-only/setup-sandbox.js

@@ -0,0 +1,474 @@
+/* global host, bridge, data, context */
+
+'use strict';
+
+const {
+	Object: localObject,
+	Array: localArray,
+	Error: LocalError,
+	Reflect: localReflect,
+	Proxy: LocalProxy,
+	WeakMap: LocalWeakMap,
+	Function: localFunction,
+	Promise: localPromise,
+	eval: localEval
+} = global;
+
+const {
+	freeze: localObjectFreeze
+} = localObject;
+
+const {
+	getPrototypeOf: localReflectGetPrototypeOf,
+	apply: localReflectApply,
+	deleteProperty: localReflectDeleteProperty,
+	has: localReflectHas,
+	defineProperty: localReflectDefineProperty,
+	setPrototypeOf: localReflectSetPrototypeOf,
+	getOwnPropertyDescriptor: localReflectGetOwnPropertyDescriptor
+} = localReflect;
+
+const {
+	isArray: localArrayIsArray
+} = localArray;
+
+const {
+	ensureThis,
+	ReadOnlyHandler,
+	from,
+	fromWithFactory,
+	readonlyFactory,
+	connect,
+	addProtoMapping,
+	VMError,
+	ReadOnlyMockHandler
+} = bridge;
+
+const {
+	allowAsync,
+	GeneratorFunction,
+	AsyncFunction,
+	AsyncGeneratorFunction
+} = data;
+
+const {
+	get: localWeakMapGet,
+	set: localWeakMapSet
+} = LocalWeakMap.prototype;
+
+function localUnexpected() {
+	return new VMError('Should not happen');
+}
+
+// global is originally prototype of host.Object so it can be used to climb up from the sandbox.
+if (!localReflectSetPrototypeOf(context, localObject.prototype)) throw localUnexpected();
+
+Object.defineProperties(global, {
+	global: {value: global, writable: true, configurable: true, enumerable: true},
+	globalThis: {value: global, writable: true, configurable: true},
+	GLOBAL: {value: global, writable: true, configurable: true},
+	root: {value: global, writable: true, configurable: true},
+	Error: {value: LocalError}
+});
+
+if (!localReflectDefineProperty(global, 'VMError', {
+	__proto__: null,
+	value: VMError,
+	writable: true,
+	enumerable: false,
+	configurable: true
+})) throw localUnexpected();
+
+// Fixes buffer unsafe allocation
+/* eslint-disable no-use-before-define */
+class BufferHandler extends ReadOnlyHandler {
+
+	apply(target, thiz, args) {
+		if (args.length > 0 && typeof args[0] === 'number') {
+			return LocalBuffer.alloc(args[0]);
+		}
+		return localReflectApply(LocalBuffer.from, LocalBuffer, args);
+	}
+
+	construct(target, args, newTarget) {
+		if (args.length > 0 && typeof args[0] === 'number') {
+			return LocalBuffer.alloc(args[0]);
+		}
+		return localReflectApply(LocalBuffer.from, LocalBuffer, args);
+	}
+
+}
+/* eslint-enable no-use-before-define */
+
+const LocalBuffer = fromWithFactory(obj => new BufferHandler(obj), host.Buffer);
+
+
+if (!localReflectDefineProperty(global, 'Buffer', {
+	__proto__: null,
+	value: LocalBuffer,
+	writable: true,
+	enumerable: false,
+	configurable: true
+})) throw localUnexpected();
+
+addProtoMapping(LocalBuffer.prototype, host.Buffer.prototype, 'Uint8Array');
+
+/**
+ *
+ * @param {*} size Size of new buffer
+ * @this LocalBuffer
+ * @return {LocalBuffer}
+ */
+function allocUnsafe(size) {
+	return LocalBuffer.alloc(size);
+}
+
+connect(allocUnsafe, host.Buffer.allocUnsafe);
+
+/**
+ *
+ * @param {*} size Size of new buffer
+ * @this LocalBuffer
+ * @return {LocalBuffer}
+ */
+function allocUnsafeSlow(size) {
+	return LocalBuffer.alloc(size);
+}
+
+connect(allocUnsafeSlow, host.Buffer.allocUnsafeSlow);
+
+/**
+ * Replacement for Buffer inspect
+ *
+ * @param {*} recurseTimes
+ * @param {*} ctx
+ * @this LocalBuffer
+ * @return {string}
+ */
+function inspect(recurseTimes, ctx) {
+	// Mimic old behavior, could throw but didn't pass a test.
+	const max = host.INSPECT_MAX_BYTES;
+	const actualMax = Math.min(max, this.length);
+	const remaining = this.length - max;
+	let str = this.hexSlice(0, actualMax).replace(/(.{2})/g, '$1 ').trim();
+	if (remaining > 0) str += ` ... ${remaining} more byte${remaining > 1 ? 's' : ''}`;
+	return `<${this.constructor.name} ${str}>`;
+}
+
+connect(inspect, host.Buffer.prototype.inspect);
+
+connect(localFunction.prototype.bind, host.Function.prototype.bind);
+
+connect(localObject.prototype.__defineGetter__, host.Object.prototype.__defineGetter__);
+connect(localObject.prototype.__defineSetter__, host.Object.prototype.__defineSetter__);
+connect(localObject.prototype.__lookupGetter__, host.Object.prototype.__lookupGetter__);
+connect(localObject.prototype.__lookupSetter__, host.Object.prototype.__lookupSetter__);
+
+/*
+ * PrepareStackTrace sanitization
+ */
+
+const oldPrepareStackTraceDesc = localReflectGetOwnPropertyDescriptor(LocalError, 'prepareStackTrace');
+
+let currentPrepareStackTrace = LocalError.prepareStackTrace;
+const wrappedPrepareStackTrace = new LocalWeakMap();
+if (typeof currentPrepareStackTrace === 'function') {
+	wrappedPrepareStackTrace.set(currentPrepareStackTrace, currentPrepareStackTrace);
+}
+
+let OriginalCallSite;
+LocalError.prepareStackTrace = (e, sst) => {
+	OriginalCallSite = sst[0].constructor;
+};
+new LocalError().stack;
+if (typeof OriginalCallSite === 'function') {
+	LocalError.prepareStackTrace = undefined;
+
+	function makeCallSiteGetters(list) {
+		const callSiteGetters = [];
+		for (let i=0; i<list.length; i++) {
+			const name = list[i];
+			const func = OriginalCallSite.prototype[name];
+			callSiteGetters[i] = {__proto__: null,
+				name,
+				propName: '_' + name,
+				func: (thiz) => {
+					return localReflectApply(func, thiz, []);
+				}
+			};
+		}
+		return callSiteGetters;
+	}
+
+	function applyCallSiteGetters(thiz, callSite, getters) {
+		for (let i=0; i<getters.length; i++) {
+			const getter = getters[i];
+			localReflectDefineProperty(thiz, getter.propName, {
+				__proto__: null,
+				value: getter.func(callSite)
+			});
+		}
+	}
+
+	const callSiteGetters = makeCallSiteGetters([
+		'getTypeName',
+		'getFunctionName',
+		'getMethodName',
+		'getFileName',
+		'getLineNumber',
+		'getColumnNumber',
+		'getEvalOrigin',
+		'isToplevel',
+		'isEval',
+		'isNative',
+		'isConstructor',
+		'isAsync',
+		'isPromiseAll',
+		'getPromiseIndex'
+	]);
+
+	class CallSite {
+		constructor(callSite) {
+			applyCallSiteGetters(this, callSite, callSiteGetters);
+		}
+		getThis() {
+			return undefined;
+		}
+		getFunction() {
+			return undefined;
+		}
+		toString() {
+			return 'CallSite {}';
+		}
+	}
+
+
+	for (let i=0; i<callSiteGetters.length; i++) {
+		const name = callSiteGetters[i].name;
+		const funcProp = localReflectGetOwnPropertyDescriptor(OriginalCallSite.prototype, name);
+		if (!funcProp) continue;
+		const propertyName = callSiteGetters[i].propName;
+		const func = {func() {
+			return this[propertyName];
+		}}.func;
+		const nameProp = localReflectGetOwnPropertyDescriptor(func, 'name');
+		if (!nameProp) throw localUnexpected();
+		nameProp.value = name;
+		if (!localReflectDefineProperty(func, 'name', nameProp)) throw localUnexpected();
+		funcProp.value = func;
+		if (!localReflectDefineProperty(CallSite.prototype, name, funcProp)) throw localUnexpected();
+	}
+
+	if (!localReflectDefineProperty(LocalError, 'prepareStackTrace', {
+		configurable: false,
+		enumerable: false,
+		get() {
+			return currentPrepareStackTrace;
+		},
+		set(value) {
+			if (typeof(value) !== 'function') {
+				currentPrepareStackTrace = value;
+				return;
+			}
+			const wrapped = localReflectApply(localWeakMapGet, wrappedPrepareStackTrace, [value]);
+			if (wrapped) {
+				currentPrepareStackTrace = wrapped;
+				return;
+			}
+			const newWrapped = (error, sst) => {
+				const sandboxSst = ensureThis(sst);
+				if (localArrayIsArray(sst)) {
+					if (sst === sandboxSst) {
+						for (let i=0; i < sst.length; i++) {
+							const cs = sst[i];
+							if (typeof cs === 'object' && localReflectGetPrototypeOf(cs) === OriginalCallSite.prototype) {
+								sst[i] = new CallSite(cs);
+							}
+						}
+					} else {
+						sst = [];
+						for (let i=0; i < sandboxSst.length; i++) {
+							const cs = sandboxSst[i];
+							localReflectDefineProperty(sst, i, {
+								__proto__: null,
+								value: new CallSite(cs),
+								enumerable: true,
+								configurable: true,
+								writable: true
+							});
+						}
+					}
+				} else {
+					sst = sandboxSst;
+				}
+				return value(error, sst);
+			};
+			localReflectApply(localWeakMapSet, wrappedPrepareStackTrace, [value, newWrapped]);
+			localReflectApply(localWeakMapSet, wrappedPrepareStackTrace, [newWrapped, newWrapped]);
+			currentPrepareStackTrace = newWrapped;
+		}
+	})) throw localUnexpected();
+} else if (oldPrepareStackTraceDesc) {
+	localReflectDefineProperty(LocalError, 'prepareStackTrace', oldPrepareStackTraceDesc);
+} else {
+	localReflectDeleteProperty(LocalError, 'prepareStackTrace');
+}
+
+/*
+ * Exception sanitization
+ */
+
+const withProxy = localObjectFreeze({
+	__proto__: null,
+	has(target, key) {
+		if (key === host.INTERNAL_STATE_NAME) return false;
+		return localReflectHas(target, key);
+	}
+});
+
+const interanState = localObjectFreeze({
+	__proto__: null,
+	wrapWith(x) {
+		if (x === null || x === undefined) return x;
+		return new LocalProxy(localObject(x), withProxy);
+	},
+	handleException: ensureThis,
+	import(what) {
+		throw new VMError('Dynamic Import not supported');
+	}
+});
+
+if (!localReflectDefineProperty(global, host.INTERNAL_STATE_NAME, {
+	__proto__: null,
+	configurable: false,
+	enumerable: false,
+	writable: false,
+	value: interanState
+})) throw localUnexpected();
+
+/*
+ * Eval sanitization
+ */
+
+function throwAsync() {
+	return new VMError('Async not available');
+}
+
+function makeFunction(inputArgs, isAsync, isGenerator) {
+	const lastArgs = inputArgs.length - 1;
+	let code = lastArgs >= 0 ? `${inputArgs[lastArgs]}` : '';
+	let args = lastArgs > 0 ? `${inputArgs[0]}` : '';
+	for (let i = 1; i < lastArgs; i++) {
+		args += `,${inputArgs[i]}`;
+	}
+	try {
+		code = host.transformAndCheck(args, code, isAsync, isGenerator, allowAsync);
+	} catch (e) {
+		throw bridge.from(e);
+	}
+	return localEval(code);
+}
+
+const FunctionHandler = {
+	__proto__: null,
+	apply(target, thiz, args) {
+		return makeFunction(args, this.isAsync, this.isGenerator);
+	},
+	construct(target, args, newTarget) {
+		return makeFunction(args, this.isAsync, this.isGenerator);
+	}
+};
+
+const EvalHandler = {
+	__proto__: null,
+	apply(target, thiz, args) {
+		if (args.length === 0) return undefined;
+		let code = `${args[0]}`;
+		try {
+			code = host.transformAndCheck(null, code, false, false, allowAsync);
+		} catch (e) {
+			throw bridge.from(e);
+		}
+		return localEval(code);
+	}
+};
+
+const AsyncErrorHandler = {
+	__proto__: null,
+	apply(target, thiz, args) {
+		throw throwAsync();
+	},
+	construct(target, args, newTarget) {
+		throw throwAsync();
+	}
+};
+
+function makeCheckFunction(isAsync, isGenerator) {
+	if (isAsync && !allowAsync) return AsyncErrorHandler;
+	return {
+		__proto__: FunctionHandler,
+		isAsync,
+		isGenerator
+	};
+}
+
+function overrideWithProxy(obj, prop, value, handler) {
+	const proxy = new LocalProxy(value, handler);
+	if (!localReflectDefineProperty(obj, prop, {__proto__: null, value: proxy})) throw localUnexpected();
+	return proxy;
+}
+
+const proxiedFunction = overrideWithProxy(localFunction.prototype, 'constructor', localFunction, makeCheckFunction(false, false));
+if (GeneratorFunction) {
+	if (!localReflectSetPrototypeOf(GeneratorFunction, proxiedFunction)) throw localUnexpected();
+	overrideWithProxy(GeneratorFunction.prototype, 'constructor', GeneratorFunction, makeCheckFunction(false, true));
+}
+if (AsyncFunction) {
+	if (!localReflectSetPrototypeOf(AsyncFunction, proxiedFunction)) throw localUnexpected();
+	overrideWithProxy(AsyncFunction.prototype, 'constructor', AsyncFunction, makeCheckFunction(true, false));
+}
+if (AsyncGeneratorFunction) {
+	if (!localReflectSetPrototypeOf(AsyncGeneratorFunction, proxiedFunction)) throw localUnexpected();
+	overrideWithProxy(AsyncGeneratorFunction.prototype, 'constructor', AsyncGeneratorFunction, makeCheckFunction(true, true));
+}
+
+global.Function = proxiedFunction;
+global.eval = new LocalProxy(localEval, EvalHandler);
+
+/*
+ * Promise sanitization
+ */
+
+if (localPromise && !allowAsync) {
+
+	const PromisePrototype = localPromise.prototype;
+
+	overrideWithProxy(PromisePrototype, 'then', PromisePrototype.then, AsyncErrorHandler);
+	// This seems not to work, and will produce
+	// UnhandledPromiseRejectionWarning: TypeError: Method Promise.prototype.then called on incompatible receiver [object Object].
+	// This is likely caused since the host.Promise.prototype.then cannot use the VM Proxy object.
+	// Contextify.connect(host.Promise.prototype.then, Promise.prototype.then);
+
+	if (PromisePrototype.finally) {
+		overrideWithProxy(PromisePrototype, 'finally', PromisePrototype.finally, AsyncErrorHandler);
+		// Contextify.connect(host.Promise.prototype.finally, Promise.prototype.finally);
+	}
+	if (Promise.prototype.catch) {
+		overrideWithProxy(PromisePrototype, 'catch', PromisePrototype.catch, AsyncErrorHandler);
+		// Contextify.connect(host.Promise.prototype.catch, Promise.prototype.catch);
+	}
+
+}
+
+function readonly(other, mock) {
+	// Note: other@other(unsafe) mock@other(unsafe) returns@this(unsafe) throws@this(unsafe)
+	if (!mock) return fromWithFactory(readonlyFactory, other);
+	const tmock = from(mock);
+	return fromWithFactory(obj=>new ReadOnlyMockHandler(obj, tmock), other);
+}
+
+return {
+	__proto__: null,
+	readonly,
+	global
+};

dist/restore/bridge.js

@@ -0,0 +1,1010 @@
+'use strict';
+
+/**
+ * __        ___    ____  _   _ ___ _   _  ____
+ * \ \      / / \  |  _ \| \ | |_ _| \ | |/ ___|
+ *  \ \ /\ / / _ \ | |_) |  \| || ||  \| | |  _
+ *   \ V  V / ___ \|  _ <| |\  || || |\  | |_| |
+ *    \_/\_/_/   \_\_| \_\_| \_|___|_| \_|\____|
+ *
+ * This file is critical for vm2. It implements the bridge between the host and the sandbox.
+ * If you do not know exactly what you are doing, you should NOT edit this file.
+ *
+ * The file is loaded in the host and sandbox to handle objects in both directions.
+ * This is done to ensure that RangeErrors are from the correct context.
+ * The boundary between the sandbox and host might throw RangeErrors from both contexts.
+ * Therefore, thisFromOther and friends can handle objects from both domains.
+ *
+ * Method parameters have comments to tell from which context they came.
+ *
+ */
+
+const globalsList = [
+	'Number',
+	'String',
+	'Boolean',
+	'Date',
+	'RegExp',
+	'Map',
+	'WeakMap',
+	'Set',
+	'WeakSet',
+	'Promise',
+	'Function'
+];
+
+const errorsList = [
+	'RangeError',
+	'ReferenceError',
+	'SyntaxError',
+	'TypeError',
+	'EvalError',
+	'URIError',
+	'Error'
+];
+
+const OPNA = 'Operation not allowed on contextified object.';
+
+const thisGlobalPrototypes = {
+	__proto__: null,
+	Object: Object.prototype,
+	Array: Array.prototype
+};
+
+for (let i = 0; i < globalsList.length; i++) {
+	const key = globalsList[i];
+	const g = global[key];
+	if (g) thisGlobalPrototypes[key] = g.prototype;
+}
+
+for (let i = 0; i < errorsList.length; i++) {
+	const key = errorsList[i];
+	const g = global[key];
+	if (g) thisGlobalPrototypes[key] = g.prototype;
+}
+
+const {
+	getPrototypeOf: thisReflectGetPrototypeOf,
+	setPrototypeOf: thisReflectSetPrototypeOf,
+	defineProperty: thisReflectDefineProperty,
+	deleteProperty: thisReflectDeleteProperty,
+	getOwnPropertyDescriptor: thisReflectGetOwnPropertyDescriptor,
+	isExtensible: thisReflectIsExtensible,
+	preventExtensions: thisReflectPreventExtensions,
+	apply: thisReflectApply,
+	construct: thisReflectConstruct,
+	set: thisReflectSet,
+	get: thisReflectGet,
+	has: thisReflectHas,
+	ownKeys: thisReflectOwnKeys,
+	enumerate: thisReflectEnumerate,
+} = Reflect;
+
+const thisObject = Object;
+const {
+	freeze: thisObjectFreeze,
+	prototype: thisObjectPrototype
+} = thisObject;
+const thisObjectHasOwnProperty = thisObjectPrototype.hasOwnProperty;
+const ThisProxy = Proxy;
+const ThisWeakMap = WeakMap;
+const {
+	get: thisWeakMapGet,
+	set: thisWeakMapSet
+} = ThisWeakMap.prototype;
+const ThisMap = Map;
+const thisMapGet = ThisMap.prototype.get;
+const thisMapSet = ThisMap.prototype.set;
+const thisFunction = Function;
+const thisFunctionBind = thisFunction.prototype.bind;
+const thisArrayIsArray = Array.isArray;
+const thisErrorCaptureStackTrace = Error.captureStackTrace;
+
+const thisSymbolToString = Symbol.prototype.toString;
+const thisSymbolToStringTag = Symbol.toStringTag;
+const thisSymbolIterator = Symbol.iterator;
+const thisSymbolNodeJSUtilInspectCustom = Symbol.for('nodejs.util.inspect.custom');
+
+/**
+ * VMError.
+ *
+ * @public
+ * @extends {Error}
+ */
+class VMError extends Error {
+
+	/**
+	 * Create VMError instance.
+	 *
+	 * @public
+	 * @param {string} message - Error message.
+	 * @param {string} code - Error code.
+	 */
+	constructor(message, code) {
+		super(message);
+
+		this.name = 'VMError';
+		this.code = code;
+
+		thisErrorCaptureStackTrace(this, this.constructor);
+	}
+}
+
+thisGlobalPrototypes['VMError'] = VMError.prototype;
+
+function thisUnexpected() {
+	return new VMError('Unexpected');
+}
+
+if (!thisReflectSetPrototypeOf(exports, null)) throw thisUnexpected();
+
+function thisSafeGetOwnPropertyDescriptor(obj, key) {
+	const desc = thisReflectGetOwnPropertyDescriptor(obj, key);
+	if (!desc) return desc;
+	if (!thisReflectSetPrototypeOf(desc, null)) throw thisUnexpected();
+	return desc;
+}
+
+function thisThrowCallerCalleeArgumentsAccess(key) {
+	'use strict';
+	thisThrowCallerCalleeArgumentsAccess[key];
+	return thisUnexpected();
+}
+
+function thisIdMapping(factory, other) {
+	return other;
+}
+
+const thisThrowOnKeyAccessHandler = thisObjectFreeze({
+	__proto__: null,
+	get(target, key, receiver) {
+		if (typeof key === 'symbol') {
+			key = thisReflectApply(thisSymbolToString, key, []);
+		}
+		throw new VMError(`Unexpected access to key '${key}'`);
+	}
+});
+
+const emptyForzenObject = thisObjectFreeze({
+	__proto__: null
+});
+
+const thisThrowOnKeyAccess = new ThisProxy(emptyForzenObject, thisThrowOnKeyAccessHandler);
+
+function SafeBase() {}
+
+if (!thisReflectDefineProperty(SafeBase, 'prototype', {
+	__proto__: null,
+	value: thisThrowOnKeyAccess
+})) throw thisUnexpected();
+
+function SHARED_FUNCTION() {}
+
+const TEST_PROXY_HANDLER = thisObjectFreeze({
+	__proto__: thisThrowOnKeyAccess,
+	construct() {
+		return this;
+	}
+});
+
+function thisIsConstructor(obj) {
+	// Note: obj@any(unsafe)
+	const Func = new ThisProxy(obj, TEST_PROXY_HANDLER);
+	try {
+		// eslint-disable-next-line no-new
+		new Func();
+		return true;
+	} catch (e) {
+		return false;
+	}
+}
+
+function thisCreateTargetObject(obj, proto) {
+	// Note: obj@any(unsafe) proto@any(unsafe) returns@this(unsafe) throws@this(unsafe)
+	let base;
+	if (typeof obj === 'function') {
+		if (thisIsConstructor(obj)) {
+			// Bind the function since bound functions do not have a prototype property.
+			base = thisReflectApply(thisFunctionBind, SHARED_FUNCTION, [null]);
+		} else {
+			base = () => {};
+		}
+	} else if (thisArrayIsArray(obj)) {
+		base = [];
+	} else {
+		return {__proto__: proto};
+	}
+	if (!thisReflectSetPrototypeOf(base, proto)) throw thisUnexpected();
+	return base;
+}
+
+function createBridge(otherInit, registerProxy) {
+
+	const mappingOtherToThis = new ThisWeakMap();
+	const protoMappings = new ThisMap();
+	const protoName = new ThisMap();
+
+	function thisAddProtoMapping(proto, other, name) {
+		// Note: proto@this(unsafe) other@other(unsafe) name@this(unsafe) throws@this(unsafe)
+		thisReflectApply(thisMapSet, protoMappings, [proto, thisIdMapping]);
+		thisReflectApply(thisMapSet, protoMappings, [other,
+			(factory, object) => thisProxyOther(factory, object, proto)]);
+		if (name) thisReflectApply(thisMapSet, protoName, [proto, name]);
+	}
+
+	function thisAddProtoMappingFactory(protoFactory, other, name) {
+		// Note: protoFactory@this(unsafe) other@other(unsafe) name@this(unsafe) throws@this(unsafe)
+		let proto;
+		thisReflectApply(thisMapSet, protoMappings, [other,
+			(factory, object) => {
+				if (!proto) {
+					proto = protoFactory();
+					thisReflectApply(thisMapSet, protoMappings, [proto, thisIdMapping]);
+					if (name) thisReflectApply(thisMapSet, protoName, [proto, name]);
+				}
+				return thisProxyOther(factory, object, proto);
+			}]);
+	}
+
+	const result = {
+		__proto__: null,
+		globalPrototypes: thisGlobalPrototypes,
+		safeGetOwnPropertyDescriptor: thisSafeGetOwnPropertyDescriptor,
+		fromArguments: thisFromOtherArguments,
+		from: thisFromOther,
+		fromWithFactory: thisFromOtherWithFactory,
+		ensureThis: thisEnsureThis,
+		mapping: mappingOtherToThis,
+		connect: thisConnect,
+		reflectSet: thisReflectSet,
+		reflectGet: thisReflectGet,
+		reflectDefineProperty: thisReflectDefineProperty,
+		reflectDeleteProperty: thisReflectDeleteProperty,
+		reflectApply: thisReflectApply,
+		reflectConstruct: thisReflectConstruct,
+		reflectHas: thisReflectHas,
+		reflectOwnKeys: thisReflectOwnKeys,
+		reflectEnumerate: thisReflectEnumerate,
+		reflectGetPrototypeOf: thisReflectGetPrototypeOf,
+		reflectIsExtensible: thisReflectIsExtensible,
+		reflectPreventExtensions: thisReflectPreventExtensions,
+		objectHasOwnProperty: thisObjectHasOwnProperty,
+		weakMapSet: thisWeakMapSet,
+		addProtoMapping: thisAddProtoMapping,
+		addProtoMappingFactory: thisAddProtoMappingFactory,
+		defaultFactory,
+		protectedFactory,
+		readonlyFactory,
+		VMError
+	};
+
+	const isHost = typeof otherInit !== 'object';
+
+	if (isHost) {
+		otherInit = otherInit(result, registerProxy);
+	}
+
+	result.other = otherInit;
+
+	const {
+		globalPrototypes: otherGlobalPrototypes,
+		safeGetOwnPropertyDescriptor: otherSafeGetOwnPropertyDescriptor,
+		fromArguments: otherFromThisArguments,
+		from: otherFromThis,
+		mapping: mappingThisToOther,
+		reflectSet: otherReflectSet,
+		reflectGet: otherReflectGet,
+		reflectDefineProperty: otherReflectDefineProperty,
+		reflectDeleteProperty: otherReflectDeleteProperty,
+		reflectApply: otherReflectApply,
+		reflectConstruct: otherReflectConstruct,
+		reflectHas: otherReflectHas,
+		reflectOwnKeys: otherReflectOwnKeys,
+		reflectEnumerate: otherReflectEnumerate,
+		reflectGetPrototypeOf: otherReflectGetPrototypeOf,
+		reflectIsExtensible: otherReflectIsExtensible,
+		reflectPreventExtensions: otherReflectPreventExtensions,
+		objectHasOwnProperty: otherObjectHasOwnProperty,
+		weakMapSet: otherWeakMapSet
+	} = otherInit;
+
+	function thisOtherHasOwnProperty(object, key) {
+		// Note: object@other(safe) key@prim throws@this(unsafe)
+		try {
+			return otherReflectApply(otherObjectHasOwnProperty, object, [key]) === true;
+		} catch (e) { // @other(unsafe)
+			throw thisFromOtherForThrow(e);
+		}
+	}
+
+	function thisDefaultGet(handler, object, key, desc) {
+		// Note: object@other(unsafe) key@prim desc@other(safe)
+		let ret; // @other(unsafe)
+		if (desc.get || desc.set) {
+			const getter = desc.get;
+			if (!getter) return undefined;
+			try {
+				ret = otherReflectApply(getter, object, [key]);
+			} catch (e) {
+				throw thisFromOtherForThrow(e);
+			}
+		} else {
+			ret = desc.value;
+		}
+		return handler.fromOtherWithContext(ret);
+	}
+
+	function otherFromThisIfAvailable(to, from, key) {
+		// Note: to@other(safe) from@this(safe) key@prim throws@this(unsafe)
+		if (!thisReflectApply(thisObjectHasOwnProperty, from, [key])) return false;
+		try {
+			to[key] = otherFromThis(from[key]);
+		} catch (e) { // @other(unsafe)
+			throw thisFromOtherForThrow(e);
+		}
+		return true;
+	}
+
+	class BaseHandler extends SafeBase {
+
+		constructor(object) {
+			// Note: object@other(unsafe) throws@this(unsafe)
+			super();
+			this.objectWrapper = () => object;
+		}
+
+		getObject() {
+			return this.objectWrapper();
+		}
+
+		getFactory() {
+			return defaultFactory;
+		}
+
+		fromOtherWithContext(other) {
+			// Note: other@other(unsafe) throws@this(unsafe)
+			return thisFromOtherWithFactory(this.getFactory(), other);
+		}
+
+		doPreventExtensions(target, object, factory) {
+			// Note: target@this(unsafe) object@other(unsafe) throws@this(unsafe)
+			let keys; // @other(safe-array-of-prim)
+			try {
+				keys = otherReflectOwnKeys(object);
+			} catch (e) { // @other(unsafe)
+				throw thisFromOtherForThrow(e);
+			}
+			for (let i = 0; i < keys.length; i++) {
+				const key = keys[i]; // @prim
+				let desc;
+				try {
+					desc = otherSafeGetOwnPropertyDescriptor(object, key);
+				} catch (e) { // @other(unsafe)
+					throw thisFromOtherForThrow(e);
+				}
+				if (!desc) continue;
+				if (!desc.configurable) {
+					const current = thisSafeGetOwnPropertyDescriptor(target, key);
+					if (current && !current.configurable) continue;
+					if (desc.get || desc.set) {
+						desc.get = this.fromOtherWithContext(desc.get);
+						desc.set = this.fromOtherWithContext(desc.set);
+					} else if (typeof object === 'function' && (key === 'caller' || key === 'callee' || key === 'arguments')) {
+						desc.value = null;
+					} else {
+						desc.value = this.fromOtherWithContext(desc.value);
+					}
+				} else {
+					if (desc.get || desc.set) {
+						desc = {
+							__proto__: null,
+							configurable: true,
+							enumerable: desc.enumerable,
+							writable: true,
+							value: null
+						};
+					} else {
+						desc.value = null;
+					}
+				}
+				if (!thisReflectDefineProperty(target, key, desc)) throw thisUnexpected();
+			}
+			if (!thisReflectPreventExtensions(target)) throw thisUnexpected();
+		}
+
+		get(target, key, receiver) {
+			// Note: target@this(unsafe) key@prim receiver@this(unsafe) throws@this(unsafe)
+			const object = this.getObject(); // @other(unsafe)
+			switch (key) {
+				case 'constructor': {
+					const desc = otherSafeGetOwnPropertyDescriptor(object, key);
+					if (desc) return thisDefaultGet(this, object, key, desc);
+					const proto = thisReflectGetPrototypeOf(target);
+					return proto === null ? undefined : proto.constructor;
+				}
+				case '__proto__': {
+					const desc = otherSafeGetOwnPropertyDescriptor(object, key);
+					if (desc) return thisDefaultGet(this, object, key, desc);
+					return thisReflectGetPrototypeOf(target);
+				}
+				case thisSymbolToStringTag:
+					if (!thisOtherHasOwnProperty(object, thisSymbolToStringTag)) {
+						const proto = thisReflectGetPrototypeOf(target);
+						const name = thisReflectApply(thisMapGet, protoName, [proto]);
+						if (name) return name;
+					}
+					break;
+				case 'arguments':
+				case 'caller':
+				case 'callee':
+					if (typeof object === 'function' && thisOtherHasOwnProperty(object, key)) {
+						throw thisThrowCallerCalleeArgumentsAccess(key);
+					}
+					break;
+			}
+			let ret; // @other(unsafe)
+			try {
+				ret = otherReflectGet(object, key);
+			} catch (e) { // @other(unsafe)
+				throw thisFromOtherForThrow(e);
+			}
+			return this.fromOtherWithContext(ret);
+		}
+
+		set(target, key, value, receiver) {
+			// Note: target@this(unsafe) key@prim value@this(unsafe) receiver@this(unsafe) throws@this(unsafe)
+			const object = this.getObject(); // @other(unsafe)
+			if (key === '__proto__' && !thisOtherHasOwnProperty(object, key)) {
+				return this.setPrototypeOf(target, value);
+			}
+			try {
+				value = otherFromThis(value);
+				return otherReflectSet(object, key, value) === true;
+			} catch (e) { // @other(unsafe)
+				throw thisFromOtherForThrow(e);
+			}
+		}
+
+		getPrototypeOf(target) {
+			// Note: target@this(unsafe)
+			return thisReflectGetPrototypeOf(target);
+		}
+
+		setPrototypeOf(target, value) {
+			// Note: target@this(unsafe) throws@this(unsafe)
+			throw new VMError(OPNA);
+		}
+
+		apply(target, context, args) {
+			// Note: target@this(unsafe) context@this(unsafe) args@this(safe-array) throws@this(unsafe)
+			const object = this.getObject(); // @other(unsafe)
+			let ret; // @other(unsafe)
+			try {
+				context = otherFromThis(context);
+				args = otherFromThisArguments(args);
+				ret = otherReflectApply(object, context, args);
+			} catch (e) { // @other(unsafe)
+				throw thisFromOtherForThrow(e);
+			}
+			return thisFromOther(ret);
+		}
+
+		construct(target, args, newTarget) {
+			// Note: target@this(unsafe) args@this(safe-array) newTarget@this(unsafe) throws@this(unsafe)
+			const object = this.getObject(); // @other(unsafe)
+			let ret; // @other(unsafe)
+			try {
+				args = otherFromThisArguments(args);
+				ret = otherReflectConstruct(object, args);
+			} catch (e) { // @other(unsafe)
+				throw thisFromOtherForThrow(e);
+			}
+			return thisFromOtherWithFactory(this.getFactory(), ret, thisFromOther(object));
+		}
+
+		getOwnPropertyDescriptorDesc(target, prop, desc) {
+			// Note: target@this(unsafe) prop@prim desc@other{safe} throws@this(unsafe)
+			const object = this.getObject(); // @other(unsafe)
+			if (desc && typeof object === 'function' && (prop === 'arguments' || prop === 'caller' || prop === 'callee')) desc.value = null;
+			return desc;
+		}
+
+		getOwnPropertyDescriptor(target, prop) {
+			// Note: target@this(unsafe) prop@prim throws@this(unsafe)
+			const object = this.getObject(); // @other(unsafe)
+			let desc; // @other(safe)
+			try {
+				desc = otherSafeGetOwnPropertyDescriptor(object, prop);
+			} catch (e) { // @other(unsafe)
+				throw thisFromOtherForThrow(e);
+			}
+
+			desc = this.getOwnPropertyDescriptorDesc(target, prop, desc);
+
+			if (!desc) return undefined;
+
+			let thisDesc;
+			if (desc.get || desc.set) {
+				thisDesc = {
+					__proto__: null,
+					get: this.fromOtherWithContext(desc.get),
+					set: this.fromOtherWithContext(desc.set),
+					enumerable: desc.enumerable === true,
+					configurable: desc.configurable === true
+				};
+			} else {
+				thisDesc = {
+					__proto__: null,
+					value: this.fromOtherWithContext(desc.value),
+					writable: desc.writable === true,
+					enumerable: desc.enumerable === true,
+					configurable: desc.configurable === true
+				};
+			}
+			if (!thisDesc.configurable) {
+				const oldDesc = thisSafeGetOwnPropertyDescriptor(target, prop);
+				if (!oldDesc || oldDesc.configurable || oldDesc.writable !== thisDesc.writable) {
+					if (!thisReflectDefineProperty(target, prop, thisDesc)) throw thisUnexpected();
+				}
+			}
+			return thisDesc;
+		}
+
+		definePropertyDesc(target, prop, desc) {
+			// Note: target@this(unsafe) prop@prim desc@this(safe) throws@this(unsafe)
+			return desc;
+		}
+
+		defineProperty(target, prop, desc) {
+			// Note: target@this(unsafe) prop@prim desc@this(unsafe) throws@this(unsafe)
+			const object = this.getObject(); // @other(unsafe)
+			if (!thisReflectSetPrototypeOf(desc, null)) throw thisUnexpected();
+
+			desc = this.definePropertyDesc(target, prop, desc);
+
+			if (!desc) return false;
+
+			let otherDesc = {__proto__: null};
+			let hasFunc = true;
+			let hasValue = true;
+			let hasBasic = true;
+			hasFunc &= otherFromThisIfAvailable(otherDesc, desc, 'get');
+			hasFunc &= otherFromThisIfAvailable(otherDesc, desc, 'set');
+			hasValue &= otherFromThisIfAvailable(otherDesc, desc, 'value');
+			hasValue &= otherFromThisIfAvailable(otherDesc, desc, 'writable');
+			hasBasic &= otherFromThisIfAvailable(otherDesc, desc, 'enumerable');
+			hasBasic &= otherFromThisIfAvailable(otherDesc, desc, 'configurable');
+
+			try {
+				if (!otherReflectDefineProperty(object, prop, otherDesc)) return false;
+				if (otherDesc.configurable !== true && (!hasBasic || !(hasFunc || hasValue))) {
+					otherDesc = otherSafeGetOwnPropertyDescriptor(object, prop);
+				}
+			} catch (e) { // @other(unsafe)
+				throw thisFromOtherForThrow(e);
+			}
+
+			if (!otherDesc.configurable) {
+				let thisDesc;
+				if (otherDesc.get || otherDesc.set) {
+					thisDesc = {
+						__proto__: null,
+						get: this.fromOtherWithContext(otherDesc.get),
+						set: this.fromOtherWithContext(otherDesc.set),
+						enumerable: otherDesc.enumerable,
+						configurable: otherDesc.configurable
+					};
+				} else {
+					thisDesc = {
+						__proto__: null,
+						value: this.fromOtherWithContext(otherDesc.value),
+						writable: otherDesc.writable,
+						enumerable: otherDesc.enumerable,
+						configurable: otherDesc.configurable
+					};
+				}
+				if (!thisReflectDefineProperty(target, prop, thisDesc)) throw thisUnexpected();
+			}
+			return true;
+		}
+
+		deleteProperty(target, prop) {
+			// Note: target@this(unsafe) prop@prim throws@this(unsafe)
+			const object = this.getObject(); // @other(unsafe)
+			try {
+				return otherReflectDeleteProperty(object, prop) === true;
+			} catch (e) { // @other(unsafe)
+				throw thisFromOtherForThrow(e);
+			}
+		}
+
+		has(target, key) {
+			// Note: target@this(unsafe) key@prim throws@this(unsafe)
+			const object = this.getObject(); // @other(unsafe)
+			try {
+				return otherReflectHas(object, key) === true;
+			} catch (e) { // @other(unsafe)
+				throw thisFromOtherForThrow(e);
+			}
+		}
+
+		isExtensible(target) {
+			// Note: target@this(unsafe) throws@this(unsafe)
+			const object = this.getObject(); // @other(unsafe)
+			try {
+				if (otherReflectIsExtensible(object)) return true;
+			} catch (e) { // @other(unsafe)
+				throw thisFromOtherForThrow(e);
+			}
+			if (thisReflectIsExtensible(target)) {
+				this.doPreventExtensions(target, object, this);
+			}
+			return false;
+		}
+
+		ownKeys(target) {
+			// Note: target@this(unsafe) throws@this(unsafe)
+			const object = this.getObject(); // @other(unsafe)
+			let res; // @other(unsafe)
+			try {
+				res = otherReflectOwnKeys(object);
+			} catch (e) { // @other(unsafe)
+				throw thisFromOtherForThrow(e);
+			}
+			return thisFromOther(res);
+		}
+
+		preventExtensions(target) {
+			// Note: target@this(unsafe) throws@this(unsafe)
+			const object = this.getObject(); // @other(unsafe)
+			try {
+				if (!otherReflectPreventExtensions(object)) return false;
+			} catch (e) { // @other(unsafe)
+				throw thisFromOtherForThrow(e);
+			}
+			if (thisReflectIsExtensible(target)) {
+				this.doPreventExtensions(target, object, this);
+			}
+			return true;
+		}
+
+		enumerate(target) {
+			// Note: target@this(unsafe) throws@this(unsafe)
+			const object = this.getObject(); // @other(unsafe)
+			let res; // @other(unsafe)
+			try {
+				res = otherReflectEnumerate(object);
+			} catch (e) { // @other(unsafe)
+				throw thisFromOtherForThrow(e);
+			}
+			return this.fromOtherWithContext(res);
+		}
+
+	}
+
+	BaseHandler.prototype[thisSymbolNodeJSUtilInspectCustom] = undefined;
+	BaseHandler.prototype[thisSymbolToStringTag] = 'VM2 Wrapper';
+	BaseHandler.prototype[thisSymbolIterator] = undefined;
+
+	function defaultFactory(object) {
+		// Note: other@other(unsafe) returns@this(unsafe) throws@this(unsafe)
+		return new BaseHandler(object);
+	}
+
+	class ProtectedHandler extends BaseHandler {
+
+		getFactory() {
+			return protectedFactory;
+		}
+
+		set(target, key, value, receiver) {
+			// Note: target@this(unsafe) key@prim value@this(unsafe) receiver@this(unsafe) throws@this(unsafe)
+			if (typeof value === 'function') {
+				return thisReflectDefineProperty(receiver, key, {
+					__proto__: null,
+					value: value,
+					writable: true,
+					enumerable: true,
+					configurable: true
+				}) === true;
+			}
+			return super.set(target, key, value, receiver);
+		}
+
+		definePropertyDesc(target, prop, desc) {
+			// Note: target@this(unsafe) prop@prim desc@this(safe) throws@this(unsafe)
+			if (desc && (desc.set || desc.get || typeof desc.value === 'function')) return undefined;
+			return desc;
+		}
+
+	}
+
+	function protectedFactory(object) {
+		// Note: other@other(unsafe) returns@this(unsafe) throws@this(unsafe)
+		return new ProtectedHandler(object);
+	}
+
+	class ReadOnlyHandler extends BaseHandler {
+
+		getFactory() {
+			return readonlyFactory;
+		}
+
+		set(target, key, value, receiver) {
+			// Note: target@this(unsafe) key@prim value@this(unsafe) receiver@this(unsafe) throws@this(unsafe)
+			return thisReflectDefineProperty(receiver, key, {
+				__proto__: null,
+				value: value,
+				writable: true,
+				enumerable: true,
+				configurable: true
+			});
+		}
+
+		setPrototypeOf(target, value) {
+			// Note: target@this(unsafe) throws@this(unsafe)
+			return false;
+		}
+
+		defineProperty(target, prop, desc) {
+			// Note: target@this(unsafe) prop@prim desc@this(unsafe) throws@this(unsafe)
+			return false;
+		}
+
+		deleteProperty(target, prop) {
+			// Note: target@this(unsafe) prop@prim throws@this(unsafe)
+			return false;
+		}
+
+		isExtensible(target) {
+			// Note: target@this(unsafe) throws@this(unsafe)
+			return false;
+		}
+
+		preventExtensions(target) {
+			// Note: target@this(unsafe) throws@this(unsafe)
+			return false;
+		}
+
+	}
+
+	function readonlyFactory(object) {
+		// Note: other@other(unsafe) returns@this(unsafe) throws@this(unsafe)
+		return new ReadOnlyHandler(object);
+	}
+
+	class ReadOnlyMockHandler extends ReadOnlyHandler {
+
+		constructor(object, mock) {
+			// Note: object@other(unsafe) mock:this(unsafe) throws@this(unsafe)
+			super(object);
+			this.mock = mock;
+		}
+
+		get(target, key, receiver) {
+			// Note: target@this(unsafe) key@prim receiver@this(unsafe) throws@this(unsafe)
+			const object = this.getObject(); // @other(unsafe)
+			const mock = this.mock;
+			if (thisReflectApply(thisObjectHasOwnProperty, mock, key) && !thisOtherHasOwnProperty(object, key)) {
+				return mock[key];
+			}
+			return super.get(target, key, receiver);
+		}
+
+	}
+
+	function thisFromOther(other) {
+		// Note: other@other(unsafe) returns@this(unsafe) throws@this(unsafe)
+		return thisFromOtherWithFactory(defaultFactory, other);
+	}
+
+	function thisProxyOther(factory, other, proto) {
+		const target = thisCreateTargetObject(other, proto);
+		const handler = factory(other);
+		const proxy = new ThisProxy(target, handler);
+		try {
+			otherReflectApply(otherWeakMapSet, mappingThisToOther, [proxy, other]);
+			registerProxy(proxy, handler);
+		} catch (e) {
+			throw new VMError('Unexpected error');
+		}
+		if (!isHost) {
+			thisReflectApply(thisWeakMapSet, mappingOtherToThis, [other, proxy]);
+			return proxy;
+		}
+		const proxy2 = new ThisProxy(proxy, emptyForzenObject);
+		try {
+			otherReflectApply(otherWeakMapSet, mappingThisToOther, [proxy2, other]);
+			registerProxy(proxy2, handler);
+		} catch (e) {
+			throw new VMError('Unexpected error');
+		}
+		thisReflectApply(thisWeakMapSet, mappingOtherToThis, [other, proxy2]);
+		return proxy2;
+	}
+
+	function thisEnsureThis(other) {
+		const type = typeof other;
+		switch (type) {
+			case 'object':
+				if (other === null) {
+					return null;
+				}
+				// fallthrough
+			case 'function':
+				let proto = thisReflectGetPrototypeOf(other);
+				if (!proto) {
+					return other;
+				}
+				while (proto) {
+					const mapping = thisReflectApply(thisMapGet, protoMappings, [proto]);
+					if (mapping) {
+						const mapped = thisReflectApply(thisWeakMapGet, mappingOtherToThis, [other]);
+						if (mapped) return mapped;
+						return mapping(defaultFactory, other);
+					}
+					proto = thisReflectGetPrototypeOf(proto);
+				}
+				return other;
+			case 'undefined':
+			case 'string':
+			case 'number':
+			case 'boolean':
+			case 'symbol':
+			case 'bigint':
+				return other;
+
+			default: // new, unknown types can be dangerous
+				throw new VMError(`Unknown type '${type}'`);
+		}
+	}
+
+	function thisFromOtherForThrow(other) {
+		for (let loop = 0; loop < 10; loop++) {
+			const type = typeof other;
+			switch (type) {
+				case 'object':
+					if (other === null) {
+						return null;
+					}
+					// fallthrough
+				case 'function':
+					const mapped = thisReflectApply(thisWeakMapGet, mappingOtherToThis, [other]);
+					if (mapped) return mapped;
+					let proto;
+					try {
+						proto = otherReflectGetPrototypeOf(other);
+					} catch (e) { // @other(unsafe)
+						other = e;
+						break;
+					}
+					if (!proto) {
+						return thisProxyOther(defaultFactory, other, null);
+					}
+					for (;;) {
+						const mapping = thisReflectApply(thisMapGet, protoMappings, [proto]);
+						if (mapping) return mapping(defaultFactory, other);
+						try {
+							proto = otherReflectGetPrototypeOf(proto);
+						} catch (e) { // @other(unsafe)
+							other = e;
+							break;
+						}
+						if (!proto) return thisProxyOther(defaultFactory, other, thisObjectPrototype);
+					}
+					break;
+				case 'undefined':
+				case 'string':
+				case 'number':
+				case 'boolean':
+				case 'symbol':
+				case 'bigint':
+					return other;
+
+				default: // new, unknown types can be dangerous
+					throw new VMError(`Unknown type '${type}'`);
+			}
+		}
+		throw new VMError('Exception recursion depth');
+	}
+
+	function thisFromOtherWithFactory(factory, other, proto) {
+		const type = typeof other;
+		switch (type) {
+			case 'object':
+				if (other === null) {
+					return null;
+				}
+				// fallthrough
+			case 'function':
+				const mapped = thisReflectApply(thisWeakMapGet, mappingOtherToThis, [other]);
+				if (mapped) return mapped;
+				if (proto) {
+					return thisProxyOther(factory, other, proto);
+				}
+				try {
+					proto = otherReflectGetPrototypeOf(other);
+				} catch (e) { // @other(unsafe)
+					throw thisFromOtherForThrow(e);
+				}
+				if (!proto) {
+					return thisProxyOther(factory, other, null);
+				}
+				do {
+					const mapping = thisReflectApply(thisMapGet, protoMappings, [proto]);
+					if (mapping) return mapping(factory, other);
+					try {
+						proto = otherReflectGetPrototypeOf(proto);
+					} catch (e) { // @other(unsafe)
+						throw thisFromOtherForThrow(e);
+					}
+				} while (proto);
+				return thisProxyOther(factory, other, thisObjectPrototype);
+			case 'undefined':
+			case 'string':
+			case 'number':
+			case 'boolean':
+			case 'symbol':
+			case 'bigint':
+				return other;
+
+			default: // new, unknown types can be dangerous
+				throw new VMError(`Unknown type '${type}'`);
+		}
+	}
+
+	function thisFromOtherArguments(args) {
+		// Note: args@other(safe-array) returns@this(safe-array) throws@this(unsafe)
+		const arr = [];
+		for (let i = 0; i < args.length; i++) {
+			const value = thisFromOther(args[i]);
+			thisReflectDefineProperty(arr, i, {
+				__proto__: null,
+				value: value,
+				writable: true,
+				enumerable: true,
+				configurable: true
+			});
+		}
+		return arr;
+	}
+
+	function thisConnect(obj, other) {
+		// Note: obj@this(unsafe) other@other(unsafe) throws@this(unsafe)
+		try {
+			otherReflectApply(otherWeakMapSet, mappingThisToOther, [obj, other]);
+		} catch (e) {
+			throw new VMError('Unexpected error');
+		}
+		thisReflectApply(thisWeakMapSet, mappingOtherToThis, [other, obj]);
+	}
+
+	thisAddProtoMapping(thisGlobalPrototypes.Object, otherGlobalPrototypes.Object);
+	thisAddProtoMapping(thisGlobalPrototypes.Array, otherGlobalPrototypes.Array);
+
+	for (let i = 0; i < globalsList.length; i++) {
+		const key = globalsList[i];
+		const tp = thisGlobalPrototypes[key];
+		const op = otherGlobalPrototypes[key];
+		if (tp && op) thisAddProtoMapping(tp, op, key);
+	}
+
+	for (let i = 0; i < errorsList.length; i++) {
+		const key = errorsList[i];
+		const tp = thisGlobalPrototypes[key];
+		const op = otherGlobalPrototypes[key];
+		if (tp && op) thisAddProtoMapping(tp, op, 'Error');
+	}
+
+	thisAddProtoMapping(thisGlobalPrototypes.VMError, otherGlobalPrototypes.VMError, 'Error');
+
+	result.BaseHandler = BaseHandler;
+	result.ProtectedHandler = ProtectedHandler;
+	result.ReadOnlyHandler = ReadOnlyHandler;
+	result.ReadOnlyMockHandler = ReadOnlyMockHandler;
+
+	return result;
+}
+
+exports.createBridge = createBridge;
+exports.VMError = VMError;

dist/restore/events.js

@@ -0,0 +1,977 @@
+// Copyright Joyent, Inc. and other Node contributors.
+//
+// Permission is hereby granted, free of charge, to any person obtaining a
+// copy of this software and associated documentation files (the
+// "Software"), to deal in the Software without restriction, including
+// without limitation the rights to use, copy, modify, merge, publish,
+// distribute, sublicense, and/or sell copies of the Software, and to permit
+// persons to whom the Software is furnished to do so, subject to the
+// following conditions:
+//
+// The above copyright notice and this permission notice shall be included
+// in all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
+// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
+// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
+// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
+// USE OR OTHER DEALINGS IN THE SOFTWARE.
+
+// Modified by the vm2 team to make this a standalone module to be loaded into the sandbox.
+
+'use strict';
+
+const host = fromhost;
+
+const {
+	Boolean,
+  Error,
+	String,
+	Symbol
+} = globalThis;
+
+const ReflectApply = Reflect.apply;
+const ReflectOwnKeys = Reflect.ownKeys;
+
+const ErrorCaptureStackTrace = Error.captureStackTrace;
+
+const NumberIsNaN = Number.isNaN;
+
+const ObjectCreate = Object.create;
+const ObjectDefineProperty = Object.defineProperty;
+const ObjectDefineProperties = Object.defineProperties;
+const ObjectGetPrototypeOf = Object.getPrototypeOf;
+
+const SymbolFor = Symbol.for;
+
+function uncurryThis(func) {
+	return (thiz, ...args) => ReflectApply(func, thiz, args);
+}
+
+const ArrayPrototypeIndexOf = uncurryThis(Array.prototype.indexOf);
+const ArrayPrototypeJoin = uncurryThis(Array.prototype.join);
+const ArrayPrototypeSlice = uncurryThis(Array.prototype.slice);
+const ArrayPrototypeSplice = uncurryThis(Array.prototype.splice);
+const ArrayPrototypeUnshift = uncurryThis(Array.prototype.unshift);
+
+const kRejection = SymbolFor('nodejs.rejection');
+
+function inspect(obj) {
+	return typeof obj === 'symbol' ? obj.toString() : `${obj}`;
+}
+
+function spliceOne(list, index) {
+	for (; index + 1 < list.length; index++)
+		list[index] = list[index + 1];
+	list.pop();
+}
+
+function assert(what, message) {
+	if (!what) throw new Error(message);
+}
+
+function E(key, msg, Base) {
+	return function NodeError(...args) {
+	  const error = new Base();
+	  const message = ReflectApply(msg, error, args);
+	  ObjectDefineProperties(error, {
+		message: {
+		  value: message,
+		  enumerable: false,
+		  writable: true,
+		  configurable: true,
+		},
+		toString: {
+		  value() {
+			return `${this.name} [${key}]: ${this.message}`;
+		  },
+		  enumerable: false,
+		  writable: true,
+		  configurable: true,
+		},
+	  });
+	  error.code = key;
+	  return error;
+	};
+}
+
+
+const ERR_INVALID_ARG_TYPE = E('ERR_INVALID_ARG_TYPE',
+  (name, expected, actual) => {
+    assert(typeof name === 'string', "'name' must be a string");
+    if (!ArrayIsArray(expected)) {
+      expected = [expected];
+    }
+
+    let msg = 'The ';
+    if (StringPrototypeEndsWith(name, ' argument')) {
+      // For cases like 'first argument'
+      msg += `${name} `;
+    } else {
+      const type = StringPrototypeIncludes(name, '.') ? 'property' : 'argument';
+      msg += `"${name}" ${type} `;
+    }
+    msg += 'must be ';
+
+    const types = [];
+    const instances = [];
+    const other = [];
+
+    for (const value of expected) {
+      assert(typeof value === 'string',
+             'All expected entries have to be of type string');
+      if (ArrayPrototypeIncludes(kTypes, value)) {
+        ArrayPrototypePush(types, StringPrototypeToLowerCase(value));
+      } else if (RegExpPrototypeTest(classRegExp, value)) {
+        ArrayPrototypePush(instances, value);
+      } else {
+        assert(value !== 'object',
+               'The value "object" should be written as "Object"');
+        ArrayPrototypePush(other, value);
+      }
+    }
+
+    // Special handle `object` in case other instances are allowed to outline
+    // the differences between each other.
+    if (instances.length > 0) {
+      const pos = ArrayPrototypeIndexOf(types, 'object');
+      if (pos !== -1) {
+        ArrayPrototypeSplice(types, pos, 1);
+        ArrayPrototypePush(instances, 'Object');
+      }
+    }
+
+    if (types.length > 0) {
+      if (types.length > 2) {
+        const last = ArrayPrototypePop(types);
+        msg += `one of type ${ArrayPrototypeJoin(types, ', ')}, or ${last}`;
+      } else if (types.length === 2) {
+        msg += `one of type ${types[0]} or ${types[1]}`;
+      } else {
+        msg += `of type ${types[0]}`;
+      }
+      if (instances.length > 0 || other.length > 0)
+        msg += ' or ';
+    }
+
+    if (instances.length > 0) {
+      if (instances.length > 2) {
+        const last = ArrayPrototypePop(instances);
+        msg +=
+          `an instance of ${ArrayPrototypeJoin(instances, ', ')}, or ${last}`;
+      } else {
+        msg += `an instance of ${instances[0]}`;
+        if (instances.length === 2) {
+          msg += ` or ${instances[1]}`;
+        }
+      }
+      if (other.length > 0)
+        msg += ' or ';
+    }
+
+    if (other.length > 0) {
+      if (other.length > 2) {
+        const last = ArrayPrototypePop(other);
+        msg += `one of ${ArrayPrototypeJoin(other, ', ')}, or ${last}`;
+      } else if (other.length === 2) {
+        msg += `one of ${other[0]} or ${other[1]}`;
+      } else {
+        if (StringPrototypeToLowerCase(other[0]) !== other[0])
+          msg += 'an ';
+        msg += `${other[0]}`;
+      }
+    }
+
+    if (actual == null) {
+      msg += `. Received ${actual}`;
+    } else if (typeof actual === 'function' && actual.name) {
+      msg += `. Received function ${actual.name}`;
+    } else if (typeof actual === 'object') {
+      if (actual.constructor && actual.constructor.name) {
+        msg += `. Received an instance of ${actual.constructor.name}`;
+      } else {
+        const inspected = inspect(actual, { depth: -1 });
+        msg += `. Received ${inspected}`;
+      }
+    } else {
+      let inspected = inspect(actual, { colors: false });
+      if (inspected.length > 25)
+        inspected = `${StringPrototypeSlice(inspected, 0, 25)}...`;
+      msg += `. Received type ${typeof actual} (${inspected})`;
+    }
+    return msg;
+  }, TypeError);
+
+const ERR_INVALID_THIS = E('ERR_INVALID_THIS', s => `Value of "this" must be of type ${s}`, TypeError);
+
+const ERR_OUT_OF_RANGE = E('ERR_OUT_OF_RANGE',
+  (str, range, input, replaceDefaultBoolean = false) => {
+    assert(range, 'Missing "range" argument');
+    let msg = replaceDefaultBoolean ? str :
+      `The value of "${str}" is out of range.`;
+    const received = inspect(input);
+    msg += ` It must be ${range}. Received ${received}`;
+    return msg;
+  }, RangeError);
+
+const ERR_UNHANDLED_ERROR = E('ERR_UNHANDLED_ERROR',
+  err => {
+    const msg = 'Unhandled error.';
+    if (err === undefined) return msg;
+    return `${msg} (${err})`;
+  }, Error);
+
+function validateBoolean(value, name) {
+  if (typeof value !== 'boolean')
+    throw new ERR_INVALID_ARG_TYPE(name, 'boolean', value);
+}
+
+function validateFunction(value, name) {
+  if (typeof value !== 'function')
+    throw new ERR_INVALID_ARG_TYPE(name, 'Function', value);
+}
+
+function validateString(value, name) {
+  if (typeof value !== 'string')
+    throw new ERR_INVALID_ARG_TYPE(name, 'string', value);
+}
+
+function nc(cond, e) {
+	return cond === undefined || cond === null ? e : cond;
+}
+
+function oc(base, key) {
+	return base === undefined || base === null ? undefined : base[key];
+}
+
+const kCapture = Symbol('kCapture');
+const kErrorMonitor = host.kErrorMonitor || Symbol('events.errorMonitor');
+const kMaxEventTargetListeners = Symbol('events.maxEventTargetListeners');
+const kMaxEventTargetListenersWarned =
+  Symbol('events.maxEventTargetListenersWarned');
+
+const kIsEventTarget = SymbolFor('nodejs.event_target');
+
+function isEventTarget(obj) {
+	return oc(oc(obj, 'constructor'), kIsEventTarget);
+}
+
+/**
+ * Creates a new `EventEmitter` instance.
+ * @param {{ captureRejections?: boolean; }} [opts]
+ * @constructs {EventEmitter}
+ */
+function EventEmitter(opts) {
+  EventEmitter.init.call(this, opts);
+}
+module.exports = EventEmitter;
+if (host.once) module.exports.once = host.once;
+if (host.on) module.exports.on = host.on;
+if (host.getEventListeners) module.exports.getEventListeners = host.getEventListeners;
+// Backwards-compat with node 0.10.x
+EventEmitter.EventEmitter = EventEmitter;
+
+EventEmitter.usingDomains = false;
+
+EventEmitter.captureRejectionSymbol = kRejection;
+ObjectDefineProperty(EventEmitter, 'captureRejections', {
+  get() {
+    return EventEmitter.prototype[kCapture];
+  },
+  set(value) {
+    validateBoolean(value, 'EventEmitter.captureRejections');
+
+    EventEmitter.prototype[kCapture] = value;
+  },
+  enumerable: true
+});
+
+if (host.EventEmitterReferencingAsyncResource) {
+	const kAsyncResource = Symbol('kAsyncResource');
+	const EventEmitterReferencingAsyncResource = host.EventEmitterReferencingAsyncResource;
+
+	class EventEmitterAsyncResource extends EventEmitter {
+		/**
+		 * @param {{
+		 *   name?: string,
+		 *   triggerAsyncId?: number,
+		 *   requireManualDestroy?: boolean,
+		 * }} [options]
+		 */
+		constructor(options = undefined) {
+			let name;
+			if (typeof options === 'string') {
+				name = options;
+				options = undefined;
+			} else {
+				if (new.target === EventEmitterAsyncResource) {
+					validateString(oc(options, 'name'), 'options.name');
+				}
+				name = oc(options, 'name') || new.target.name;
+			}
+			super(options);
+
+			this[kAsyncResource] =
+				new EventEmitterReferencingAsyncResource(this, name, options);
+		}
+
+		/**
+		 * @param {symbol,string} event
+		 * @param  {...any} args
+		 * @returns {boolean}
+		 */
+		emit(event, ...args) {
+			if (this[kAsyncResource] === undefined)
+				throw new ERR_INVALID_THIS('EventEmitterAsyncResource');
+			const { asyncResource } = this;
+			ArrayPrototypeUnshift(args, super.emit, this, event);
+			return ReflectApply(asyncResource.runInAsyncScope, asyncResource,
+													args);
+		}
+
+		/**
+		 * @returns {void}
+		 */
+		emitDestroy() {
+			if (this[kAsyncResource] === undefined)
+				throw new ERR_INVALID_THIS('EventEmitterAsyncResource');
+			this.asyncResource.emitDestroy();
+		}
+
+		/**
+		 * @type {number}
+		 */
+		get asyncId() {
+			if (this[kAsyncResource] === undefined)
+				throw new ERR_INVALID_THIS('EventEmitterAsyncResource');
+			return this.asyncResource.asyncId();
+		}
+
+		/**
+		 * @type {number}
+		 */
+		get triggerAsyncId() {
+			if (this[kAsyncResource] === undefined)
+				throw new ERR_INVALID_THIS('EventEmitterAsyncResource');
+			return this.asyncResource.triggerAsyncId();
+		}
+
+		/**
+		 * @type {EventEmitterReferencingAsyncResource}
+		 */
+		get asyncResource() {
+			if (this[kAsyncResource] === undefined)
+				throw new ERR_INVALID_THIS('EventEmitterAsyncResource');
+			return this[kAsyncResource];
+		}
+	}
+	EventEmitter.EventEmitterAsyncResource = EventEmitterAsyncResource;
+}
+
+EventEmitter.errorMonitor = kErrorMonitor;
+
+// The default for captureRejections is false
+ObjectDefineProperty(EventEmitter.prototype, kCapture, {
+  value: false,
+  writable: true,
+  enumerable: false
+});
+
+EventEmitter.prototype._events = undefined;
+EventEmitter.prototype._eventsCount = 0;
+EventEmitter.prototype._maxListeners = undefined;
+
+// By default EventEmitters will print a warning if more than 10 listeners are
+// added to it. This is a useful default which helps finding memory leaks.
+let defaultMaxListeners = 10;
+
+function checkListener(listener) {
+  validateFunction(listener, 'listener');
+}
+
+ObjectDefineProperty(EventEmitter, 'defaultMaxListeners', {
+  enumerable: true,
+  get: function() {
+    return defaultMaxListeners;
+  },
+  set: function(arg) {
+    if (typeof arg !== 'number' || arg < 0 || NumberIsNaN(arg)) {
+      throw new ERR_OUT_OF_RANGE('defaultMaxListeners',
+                                 'a non-negative number',
+                                 arg);
+    }
+    defaultMaxListeners = arg;
+  }
+});
+
+ObjectDefineProperties(EventEmitter, {
+  kMaxEventTargetListeners: {
+    value: kMaxEventTargetListeners,
+    enumerable: false,
+    configurable: false,
+    writable: false,
+  },
+  kMaxEventTargetListenersWarned: {
+    value: kMaxEventTargetListenersWarned,
+    enumerable: false,
+    configurable: false,
+    writable: false,
+  }
+});
+
+/**
+ * Sets the max listeners.
+ * @param {number} n
+ * @param {EventTarget[] | EventEmitter[]} [eventTargets]
+ * @returns {void}
+ */
+EventEmitter.setMaxListeners =
+  function(n = defaultMaxListeners, ...eventTargets) {
+    if (typeof n !== 'number' || n < 0 || NumberIsNaN(n))
+      throw new ERR_OUT_OF_RANGE('n', 'a non-negative number', n);
+    if (eventTargets.length === 0) {
+      defaultMaxListeners = n;
+    } else {
+      for (let i = 0; i < eventTargets.length; i++) {
+        const target = eventTargets[i];
+        if (isEventTarget(target)) {
+          target[kMaxEventTargetListeners] = n;
+          target[kMaxEventTargetListenersWarned] = false;
+        } else if (typeof target.setMaxListeners === 'function') {
+          target.setMaxListeners(n);
+        } else {
+          throw new ERR_INVALID_ARG_TYPE(
+            'eventTargets',
+            ['EventEmitter', 'EventTarget'],
+            target);
+        }
+      }
+    }
+  };
+
+// If you're updating this function definition, please also update any
+// re-definitions, such as the one in the Domain module (lib/domain.js).
+EventEmitter.init = function(opts) {
+
+  if (this._events === undefined ||
+      this._events === ObjectGetPrototypeOf(this)._events) {
+    this._events = ObjectCreate(null);
+    this._eventsCount = 0;
+  }
+
+  this._maxListeners = this._maxListeners || undefined;
+
+
+  if (oc(opts, 'captureRejections')) {
+    validateBoolean(opts.captureRejections, 'options.captureRejections');
+    this[kCapture] = Boolean(opts.captureRejections);
+  } else {
+    // Assigning the kCapture property directly saves an expensive
+    // prototype lookup in a very sensitive hot path.
+    this[kCapture] = EventEmitter.prototype[kCapture];
+  }
+};
+
+function addCatch(that, promise, type, args) {
+  if (!that[kCapture]) {
+    return;
+  }
+
+  // Handle Promises/A+ spec, then could be a getter
+  // that throws on second use.
+  try {
+    const then = promise.then;
+
+    if (typeof then === 'function') {
+      then.call(promise, undefined, function(err) {
+        // The callback is called with nextTick to avoid a follow-up
+        // rejection from this promise.
+        process.nextTick(emitUnhandledRejectionOrErr, that, err, type, args);
+      });
+    }
+  } catch (err) {
+    that.emit('error', err);
+  }
+}
+
+function emitUnhandledRejectionOrErr(ee, err, type, args) {
+  if (typeof ee[kRejection] === 'function') {
+    ee[kRejection](err, type, ...args);
+  } else {
+    // We have to disable the capture rejections mechanism, otherwise
+    // we might end up in an infinite loop.
+    const prev = ee[kCapture];
+
+    // If the error handler throws, it is not catchable and it
+    // will end up in 'uncaughtException'. We restore the previous
+    // value of kCapture in case the uncaughtException is present
+    // and the exception is handled.
+    try {
+      ee[kCapture] = false;
+      ee.emit('error', err);
+    } finally {
+      ee[kCapture] = prev;
+    }
+  }
+}
+
+/**
+ * Increases the max listeners of the event emitter.
+ * @param {number} n
+ * @returns {EventEmitter}
+ */
+EventEmitter.prototype.setMaxListeners = function setMaxListeners(n) {
+  if (typeof n !== 'number' || n < 0 || NumberIsNaN(n)) {
+    throw new ERR_OUT_OF_RANGE('n', 'a non-negative number', n);
+  }
+  this._maxListeners = n;
+  return this;
+};
+
+function _getMaxListeners(that) {
+  if (that._maxListeners === undefined)
+    return EventEmitter.defaultMaxListeners;
+  return that._maxListeners;
+}
+
+/**
+ * Returns the current max listener value for the event emitter.
+ * @returns {number}
+ */
+EventEmitter.prototype.getMaxListeners = function getMaxListeners() {
+  return _getMaxListeners(this);
+};
+
+/**
+ * Synchronously calls each of the listeners registered
+ * for the event.
+ * @param {string | symbol} type
+ * @param {...any} [args]
+ * @returns {boolean}
+ */
+EventEmitter.prototype.emit = function emit(type, ...args) {
+  let doError = (type === 'error');
+
+  const events = this._events;
+  if (events !== undefined) {
+    if (doError && events[kErrorMonitor] !== undefined)
+      this.emit(kErrorMonitor, ...args);
+    doError = (doError && events.error === undefined);
+  } else if (!doError)
+    return false;
+
+  // If there is no 'error' event listener then throw.
+  if (doError) {
+    let er;
+    if (args.length > 0)
+      er = args[0];
+    if (er instanceof Error) {
+      try {
+        const capture = {};
+        ErrorCaptureStackTrace(capture, EventEmitter.prototype.emit);
+      } catch (e) {}
+
+      // Note: The comments on the `throw` lines are intentional, they show
+      // up in Node's output if this results in an unhandled exception.
+      throw er; // Unhandled 'error' event
+    }
+
+    let stringifiedEr;
+    try {
+      stringifiedEr = inspect(er);
+    } catch (e) {
+      stringifiedEr = er;
+    }
+
+    // At least give some kind of context to the user
+    const err = new ERR_UNHANDLED_ERROR(stringifiedEr);
+    err.context = er;
+    throw err; // Unhandled 'error' event
+  }
+
+  const handler = events[type];
+
+  if (handler === undefined)
+    return false;
+
+  if (typeof handler === 'function') {
+    const result = handler.apply(this, args);
+
+    // We check if result is undefined first because that
+    // is the most common case so we do not pay any perf
+    // penalty
+    if (result !== undefined && result !== null) {
+      addCatch(this, result, type, args);
+    }
+  } else {
+    const len = handler.length;
+    const listeners = arrayClone(handler);
+    for (let i = 0; i < len; ++i) {
+      const result = listeners[i].apply(this, args);
+
+      // We check if result is undefined first because that
+      // is the most common case so we do not pay any perf
+      // penalty.
+      // This code is duplicated because extracting it away
+      // would make it non-inlineable.
+      if (result !== undefined && result !== null) {
+        addCatch(this, result, type, args);
+      }
+    }
+  }
+
+  return true;
+};
+
+function _addListener(target, type, listener, prepend) {
+  let m;
+  let events;
+  let existing;
+
+  checkListener(listener);
+
+  events = target._events;
+  if (events === undefined) {
+    events = target._events = ObjectCreate(null);
+    target._eventsCount = 0;
+  } else {
+    // To avoid recursion in the case that type === "newListener"! Before
+    // adding it to the listeners, first emit "newListener".
+    if (events.newListener !== undefined) {
+      target.emit('newListener', type,
+                  nc(listener.listener, listener));
+
+      // Re-assign `events` because a newListener handler could have caused the
+      // this._events to be assigned to a new object
+      events = target._events;
+    }
+    existing = events[type];
+  }
+
+  if (existing === undefined) {
+    // Optimize the case of one listener. Don't need the extra array object.
+    events[type] = listener;
+    ++target._eventsCount;
+  } else {
+    if (typeof existing === 'function') {
+      // Adding the second element, need to change to array.
+      existing = events[type] =
+        prepend ? [listener, existing] : [existing, listener];
+      // If we've already got an array, just append.
+    } else if (prepend) {
+      existing.unshift(listener);
+    } else {
+      existing.push(listener);
+    }
+
+    // Check for listener leak
+    m = _getMaxListeners(target);
+    if (m > 0 && existing.length > m && !existing.warned) {
+      existing.warned = true;
+      // No error code for this since it is a Warning
+      // eslint-disable-next-line no-restricted-syntax
+      const w = new Error('Possible EventEmitter memory leak detected. ' +
+                          `${existing.length} ${String(type)} listeners ` +
+                          `added to ${inspect(target, { depth: -1 })}. Use ` +
+                          'emitter.setMaxListeners() to increase limit');
+      w.name = 'MaxListenersExceededWarning';
+      w.emitter = target;
+      w.type = type;
+      w.count = existing.length;
+      process.emitWarning(w);
+    }
+  }
+
+  return target;
+}
+
+/**
+ * Adds a listener to the event emitter.
+ * @param {string | symbol} type
+ * @param {Function} listener
+ * @returns {EventEmitter}
+ */
+EventEmitter.prototype.addListener = function addListener(type, listener) {
+  return _addListener(this, type, listener, false);
+};
+
+EventEmitter.prototype.on = EventEmitter.prototype.addListener;
+
+/**
+ * Adds the `listener` function to the beginning of
+ * the listeners array.
+ * @param {string | symbol} type
+ * @param {Function} listener
+ * @returns {EventEmitter}
+ */
+EventEmitter.prototype.prependListener =
+    function prependListener(type, listener) {
+      return _addListener(this, type, listener, true);
+    };
+
+function onceWrapper() {
+  if (!this.fired) {
+    this.target.removeListener(this.type, this.wrapFn);
+    this.fired = true;
+    if (arguments.length === 0)
+      return this.listener.call(this.target);
+    return this.listener.apply(this.target, arguments);
+  }
+}
+
+function _onceWrap(target, type, listener) {
+  const state = { fired: false, wrapFn: undefined, target, type, listener };
+  const wrapped = onceWrapper.bind(state);
+  wrapped.listener = listener;
+  state.wrapFn = wrapped;
+  return wrapped;
+}
+
+/**
+ * Adds a one-time `listener` function to the event emitter.
+ * @param {string | symbol} type
+ * @param {Function} listener
+ * @returns {EventEmitter}
+ */
+EventEmitter.prototype.once = function once(type, listener) {
+  checkListener(listener);
+
+  this.on(type, _onceWrap(this, type, listener));
+  return this;
+};
+
+/**
+ * Adds a one-time `listener` function to the beginning of
+ * the listeners array.
+ * @param {string | symbol} type
+ * @param {Function} listener
+ * @returns {EventEmitter}
+ */
+EventEmitter.prototype.prependOnceListener =
+    function prependOnceListener(type, listener) {
+      checkListener(listener);
+
+      this.prependListener(type, _onceWrap(this, type, listener));
+      return this;
+    };
+
+
+/**
+ * Removes the specified `listener` from the listeners array.
+ * @param {string | symbol} type
+ * @param {Function} listener
+ * @returns {EventEmitter}
+ */
+EventEmitter.prototype.removeListener =
+    function removeListener(type, listener) {
+      checkListener(listener);
+
+      const events = this._events;
+      if (events === undefined)
+        return this;
+
+      const list = events[type];
+      if (list === undefined)
+        return this;
+
+      if (list === listener || list.listener === listener) {
+        if (--this._eventsCount === 0)
+          this._events = ObjectCreate(null);
+        else {
+          delete events[type];
+          if (events.removeListener)
+            this.emit('removeListener', type, list.listener || listener);
+        }
+      } else if (typeof list !== 'function') {
+        let position = -1;
+
+        for (let i = list.length - 1; i >= 0; i--) {
+          if (list[i] === listener || list[i].listener === listener) {
+            position = i;
+            break;
+          }
+        }
+
+        if (position < 0)
+          return this;
+
+        if (position === 0)
+          list.shift();
+        else {
+          spliceOne(list, position);
+        }
+
+        if (list.length === 1)
+          events[type] = list[0];
+
+        if (events.removeListener !== undefined)
+          this.emit('removeListener', type, listener);
+      }
+
+      return this;
+    };
+
+EventEmitter.prototype.off = EventEmitter.prototype.removeListener;
+
+/**
+ * Removes all listeners from the event emitter. (Only
+ * removes listeners for a specific event name if specified
+ * as `type`).
+ * @param {string | symbol} [type]
+ * @returns {EventEmitter}
+ */
+EventEmitter.prototype.removeAllListeners =
+    function removeAllListeners(type) {
+      const events = this._events;
+      if (events === undefined)
+        return this;
+
+      // Not listening for removeListener, no need to emit
+      if (events.removeListener === undefined) {
+        if (arguments.length === 0) {
+          this._events = ObjectCreate(null);
+          this._eventsCount = 0;
+        } else if (events[type] !== undefined) {
+          if (--this._eventsCount === 0)
+            this._events = ObjectCreate(null);
+          else
+            delete events[type];
+        }
+        return this;
+      }
+
+      // Emit removeListener for all listeners on all events
+      if (arguments.length === 0) {
+        for (const key of ReflectOwnKeys(events)) {
+          if (key === 'removeListener') continue;
+          this.removeAllListeners(key);
+        }
+        this.removeAllListeners('removeListener');
+        this._events = ObjectCreate(null);
+        this._eventsCount = 0;
+        return this;
+      }
+
+      const listeners = events[type];
+
+      if (typeof listeners === 'function') {
+        this.removeListener(type, listeners);
+      } else if (listeners !== undefined) {
+        // LIFO order
+        for (let i = listeners.length - 1; i >= 0; i--) {
+          this.removeListener(type, listeners[i]);
+        }
+      }
+
+      return this;
+    };
+
+function _listeners(target, type, unwrap) {
+  const events = target._events;
+
+  if (events === undefined)
+    return [];
+
+  const evlistener = events[type];
+  if (evlistener === undefined)
+    return [];
+
+  if (typeof evlistener === 'function')
+    return unwrap ? [evlistener.listener || evlistener] : [evlistener];
+
+  return unwrap ?
+    unwrapListeners(evlistener) : arrayClone(evlistener);
+}
+
+/**
+ * Returns a copy of the array of listeners for the event name
+ * specified as `type`.
+ * @param {string | symbol} type
+ * @returns {Function[]}
+ */
+EventEmitter.prototype.listeners = function listeners(type) {
+  return _listeners(this, type, true);
+};
+
+/**
+ * Returns a copy of the array of listeners and wrappers for
+ * the event name specified as `type`.
+ * @param {string | symbol} type
+ * @returns {Function[]}
+ */
+EventEmitter.prototype.rawListeners = function rawListeners(type) {
+  return _listeners(this, type, false);
+};
+
+/**
+ * Returns the number of listeners listening to the event name
+ * specified as `type`.
+ * @deprecated since v3.2.0
+ * @param {EventEmitter} emitter
+ * @param {string | symbol} type
+ * @returns {number}
+ */
+EventEmitter.listenerCount = function(emitter, type) {
+  if (typeof emitter.listenerCount === 'function') {
+    return emitter.listenerCount(type);
+  }
+  return emitter.listenerCount(type);
+};
+
+EventEmitter.prototype.listenerCount = listenerCount;
+
+/**
+ * Returns the number of listeners listening to event name
+ * specified as `type`.
+ * @param {string | symbol} type
+ * @returns {number}
+ */
+function listenerCount(type) {
+  const events = this._events;
+
+  if (events !== undefined) {
+    const evlistener = events[type];
+
+    if (typeof evlistener === 'function') {
+      return 1;
+    } else if (evlistener !== undefined) {
+      return evlistener.length;
+    }
+  }
+
+  return 0;
+}
+
+/**
+ * Returns an array listing the events for which
+ * the emitter has registered listeners.
+ * @returns {any[]}
+ */
+EventEmitter.prototype.eventNames = function eventNames() {
+  return this._eventsCount > 0 ? ReflectOwnKeys(this._events) : [];
+};
+
+function arrayClone(arr) {
+  // At least since V8 8.3, this implementation is faster than the previous
+  // which always used a simple for-loop
+  switch (arr.length) {
+    case 2: return [arr[0], arr[1]];
+    case 3: return [arr[0], arr[1], arr[2]];
+    case 4: return [arr[0], arr[1], arr[2], arr[3]];
+    case 5: return [arr[0], arr[1], arr[2], arr[3], arr[4]];
+    case 6: return [arr[0], arr[1], arr[2], arr[3], arr[4], arr[5]];
+  }
+  return ArrayPrototypeSlice(arr);
+}
+
+function unwrapListeners(arr) {
+  const ret = arrayClone(arr);
+  for (let i = 0; i < ret.length; ++i) {
+    const orig = ret[i].listener;
+    if (typeof orig === 'function')
+      ret[i] = orig;
+  }
+  return ret;
+}

dist/restore/setup-node-sandbox.js

@@ -0,0 +1,469 @@
+/* global host, data, VMError */
+
+'use strict';
+
+const LocalError = Error;
+const LocalTypeError = TypeError;
+const LocalWeakMap = WeakMap;
+
+const {
+	apply: localReflectApply,
+	defineProperty: localReflectDefineProperty
+} = Reflect;
+
+const {
+	set: localWeakMapSet,
+	get: localWeakMapGet
+} = LocalWeakMap.prototype;
+
+const {
+	isArray: localArrayIsArray
+} = Array;
+
+function uncurryThis(func) {
+	return (thiz, ...args) => localReflectApply(func, thiz, args);
+}
+
+const localArrayPrototypeSlice = uncurryThis(Array.prototype.slice);
+const localArrayPrototypeIncludes = uncurryThis(Array.prototype.includes);
+const localArrayPrototypePush = uncurryThis(Array.prototype.push);
+const localArrayPrototypeIndexOf = uncurryThis(Array.prototype.indexOf);
+const localArrayPrototypeSplice = uncurryThis(Array.prototype.splice);
+const localStringPrototypeStartsWith = uncurryThis(String.prototype.startsWith);
+const localStringPrototypeSlice = uncurryThis(String.prototype.slice);
+const localStringPrototypeIndexOf = uncurryThis(String.prototype.indexOf);
+
+const {
+	argv: optionArgv,
+	env: optionEnv,
+	console: optionConsole,
+	vm,
+	resolver,
+	extensions
+} = data;
+
+function ensureSandboxArray(a) {
+	return localArrayPrototypeSlice(a);
+}
+
+const globalPaths = ensureSandboxArray(resolver.globalPaths);
+
+class Module {
+
+	constructor(id, path, parent) {
+		this.id = id;
+		this.filename = id;
+		this.path = path;
+		this.parent = parent;
+		this.loaded = false;
+		this.paths = path ? ensureSandboxArray(resolver.genLookupPaths(path)) : [];
+		this.children = [];
+		this.exports = {};
+	}
+
+	_updateChildren(child, isNew) {
+		const children = this.children;
+		if (children && (isNew || !localArrayPrototypeIncludes(children, child))) {
+			localArrayPrototypePush(children, child);
+		}
+	}
+
+	require(id) {
+		return requireImpl(this, id, false);
+	}
+
+}
+
+const originalRequire = Module.prototype.require;
+const cacheBuiltins = {__proto__: null};
+
+function requireImpl(mod, id, direct) {
+	if (direct && mod.require !== originalRequire) {
+		return mod.require(id);
+	}
+	const filename = resolver.resolve(mod, id, undefined, Module._extensions, direct);
+	if (localStringPrototypeStartsWith(filename, 'node:')) {
+		id = localStringPrototypeSlice(filename, 5);
+		let nmod = cacheBuiltins[id];
+		if (!nmod) {
+			nmod = resolver.loadBuiltinModule(vm, id);
+			if (!nmod) throw new VMError(`Cannot find module '${filename}'`, 'ENOTFOUND');
+			cacheBuiltins[id] = nmod;
+		}
+		return nmod;
+	}
+
+	const cachedModule = Module._cache[filename];
+	if (cachedModule !== undefined) {
+		mod._updateChildren(cachedModule, false);
+		return cachedModule.exports;
+	}
+
+	let nmod = cacheBuiltins[id];
+	if (nmod) return nmod;
+	nmod = resolver.loadBuiltinModule(vm, id);
+	if (nmod) {
+		cacheBuiltins[id] = nmod;
+		return nmod;
+	}
+
+	const path = resolver.fs.dirname(filename);
+	const module = new Module(filename, path, mod);
+	resolver.registerModule(module, filename, path, mod, direct);
+	mod._updateChildren(module, true);
+	try {
+		Module._cache[filename] = module;
+		const handler = findBestExtensionHandler(filename);
+		handler(module, filename);
+		module.loaded = true;
+	} catch (e) {
+		delete Module._cache[filename];
+		const children = mod.children;
+		if (localArrayIsArray(children)) {
+			const index = localArrayPrototypeIndexOf(children, module);
+			if (index !== -1) {
+				localArrayPrototypeSplice(children, index, 1);
+			}
+		}
+		throw e;
+	}
+
+	return module.exports;
+}
+
+Module.builtinModules = ensureSandboxArray(resolver.getBuiltinModulesList());
+Module.globalPaths = globalPaths;
+Module._extensions = {__proto__: null};
+Module._cache = {__proto__: null};
+
+{
+	const keys = Object.getOwnPropertyNames(extensions);
+	for (let i = 0; i < keys.length; i++) {
+		const key = keys[i];
+		const handler = extensions[key];
+		Module._extensions[key] = (mod, filename) => handler(mod, filename);
+	}
+}
+
+function findBestExtensionHandler(filename) {
+	const name = resolver.fs.basename(filename);
+	for (let i = 0; (i = localStringPrototypeIndexOf(name, '.', i + 1)) !== -1;) {
+		const ext = localStringPrototypeSlice(name, i);
+		const handler = Module._extensions[ext];
+		if (handler) return handler;
+	}
+	const js = Module._extensions['.js'];
+	if (js) return js;
+	const keys = Object.getOwnPropertyNames(Module._extensions);
+	if (keys.length === 0) throw new VMError(`Failed to load '${filename}': Unknown type.`, 'ELOADFAIL');
+	return Module._extensions[keys[0]];
+}
+
+function createRequireForModule(mod) {
+	// eslint-disable-next-line no-shadow
+	function require(id) {
+		return requireImpl(mod, id, true);
+	}
+	function resolve(id, options) {
+		return resolver.resolve(mod, id, options, Module._extensions, true);
+	}
+	require.resolve = resolve;
+	function paths(id) {
+		return ensureSandboxArray(resolver.lookupPaths(mod, id));
+	}
+	resolve.paths = paths;
+
+	require.extensions = Module._extensions;
+
+	require.cache = Module._cache;
+
+	return require;
+}
+
+/**
+ * Prepare sandbox.
+ */
+
+const TIMERS = new LocalWeakMap();
+
+class Timeout {
+}
+
+class Interval {
+}
+
+class Immediate {
+}
+
+function clearTimer(timer) {
+	const obj = localReflectApply(localWeakMapGet, TIMERS, [timer]);
+	if (obj) {
+		obj.clear(obj.value);
+	}
+}
+
+// This is a function and not an arrow function, since the original is also a function
+// eslint-disable-next-line no-shadow
+global.setTimeout = function setTimeout(callback, delay, ...args) {
+	if (typeof callback !== 'function') throw new LocalTypeError('"callback" argument must be a function');
+	const obj = new Timeout(callback, args);
+	const cb = () => {
+		localReflectApply(callback, null, args);
+	};
+	const tmr = host.setTimeout(cb, delay);
+
+	const ref = {
+		__proto__: null,
+		clear: host.clearTimeout,
+		value: tmr
+	};
+
+	localReflectApply(localWeakMapSet, TIMERS, [obj, ref]);
+	return obj;
+};
+
+// eslint-disable-next-line no-shadow
+global.setInterval = function setInterval(callback, interval, ...args) {
+	if (typeof callback !== 'function') throw new LocalTypeError('"callback" argument must be a function');
+	const obj = new Interval();
+	const cb = () => {
+		localReflectApply(callback, null, args);
+	};
+	const tmr = host.setInterval(cb, interval);
+
+	const ref = {
+		__proto__: null,
+		clear: host.clearInterval,
+		value: tmr
+	};
+
+	localReflectApply(localWeakMapSet, TIMERS, [obj, ref]);
+	return obj;
+};
+
+// eslint-disable-next-line no-shadow
+global.setImmediate = function setImmediate(callback, ...args) {
+	if (typeof callback !== 'function') throw new LocalTypeError('"callback" argument must be a function');
+	const obj = new Immediate();
+	const cb = () => {
+		localReflectApply(callback, null, args);
+	};
+	const tmr = host.setImmediate(cb);
+
+	const ref = {
+		__proto__: null,
+		clear: host.clearImmediate,
+		value: tmr
+	};
+
+	localReflectApply(localWeakMapSet, TIMERS, [obj, ref]);
+	return obj;
+};
+
+// eslint-disable-next-line no-shadow
+global.clearTimeout = function clearTimeout(timeout) {
+	clearTimer(timeout);
+};
+
+// eslint-disable-next-line no-shadow
+global.clearInterval = function clearInterval(interval) {
+	clearTimer(interval);
+};
+
+// eslint-disable-next-line no-shadow
+global.clearImmediate = function clearImmediate(immediate) {
+	clearTimer(immediate);
+};
+
+const localProcess = host.process;
+
+function vmEmitArgs(event, args) {
+	const allargs = [event];
+	for (let i = 0; i < args.length; i++) {
+		if (!localReflectDefineProperty(allargs, i + 1, {
+			__proto__: null,
+			value: args[i],
+			writable: true,
+			enumerable: true,
+			configurable: true
+		})) throw new LocalError('Unexpected');
+	}
+	return localReflectApply(vm.emit, vm, allargs);
+}
+
+const LISTENERS = new LocalWeakMap();
+const LISTENER_HANDLER = new LocalWeakMap();
+
+/**
+ *
+ * @param {*} name
+ * @param {*} handler
+ * @this process
+ * @return {this}
+ */
+function addListener(name, handler) {
+	if (name !== 'beforeExit' && name !== 'exit') {
+		throw new LocalError(`Access denied to listen for '${name}' event.`);
+	}
+
+	let cb = localReflectApply(localWeakMapGet, LISTENERS, [handler]);
+	if (!cb) {
+		cb = () => {
+			handler();
+		};
+		localReflectApply(localWeakMapSet, LISTENER_HANDLER, [cb, handler]);
+		localReflectApply(localWeakMapSet, LISTENERS, [handler, cb]);
+	}
+
+	localProcess.on(name, cb);
+
+	return this;
+}
+
+/**
+ *
+ * @this process
+ * @return {this}
+ */
+// eslint-disable-next-line no-shadow
+function process() {
+	return this;
+}
+
+const baseUptime = localProcess.uptime();
+
+// FIXME wrong class structure
+global.process = {
+	__proto__: process.prototype,
+	argv: optionArgv !== undefined ? optionArgv : [],
+	title: localProcess.title,
+	version: localProcess.version,
+	versions: localProcess.versions,
+	arch: localProcess.arch,
+	platform: localProcess.platform,
+	env: optionEnv !== undefined ? optionEnv : {},
+	pid: localProcess.pid,
+	features: localProcess.features,
+	nextTick: function nextTick(callback, ...args) {
+		if (typeof callback !== 'function') {
+			throw new LocalError('Callback must be a function.');
+		}
+
+		localProcess.nextTick(()=>{
+			localReflectApply(callback, null, args);
+		});
+	},
+	hrtime: function hrtime(time) {
+		return localProcess.hrtime(time);
+	},
+	uptime: function uptime() {
+		return localProcess.uptime() - baseUptime;
+	},
+	cwd: function cwd() {
+		return localProcess.cwd();
+	},
+	addListener,
+	on: addListener,
+
+	once: function once(name, handler) {
+		if (name !== 'beforeExit' && name !== 'exit') {
+			throw new LocalError(`Access denied to listen for '${name}' event.`);
+		}
+
+		let triggered = false;
+		const cb = () => {
+			if (triggered) return;
+			triggered = true;
+			localProcess.removeListener(name, cb);
+			handler();
+		};
+		localReflectApply(localWeakMapSet, LISTENER_HANDLER, [cb, handler]);
+
+		localProcess.on(name, cb);
+
+		return this;
+	},
+
+	listeners: function listeners(name) {
+		if (name !== 'beforeExit' && name !== 'exit') {
+			// Maybe add ({__proto__:null})[name] to throw when name fails in https://tc39.es/ecma262/#sec-topropertykey.
+			return [];
+		}
+
+		// Filter out listeners, which were not created in this sandbox
+		const all = localProcess.listeners(name);
+		const filtered = [];
+		let j = 0;
+		for (let i = 0; i < all.length; i++) {
+			const h = localReflectApply(localWeakMapGet, LISTENER_HANDLER, [all[i]]);
+			if (h) {
+				if (!localReflectDefineProperty(filtered, j, {
+					__proto__: null,
+					value: h,
+					writable: true,
+					enumerable: true,
+					configurable: true
+				})) throw new LocalError('Unexpected');
+				j++;
+			}
+		}
+		return filtered;
+	},
+
+	removeListener: function removeListener(name, handler) {
+		if (name !== 'beforeExit' && name !== 'exit') {
+			return this;
+		}
+
+		const cb = localReflectApply(localWeakMapGet, LISTENERS, [handler]);
+		if (cb) localProcess.removeListener(name, cb);
+
+		return this;
+	},
+
+	umask: function umask() {
+		if (arguments.length) {
+			throw new LocalError('Access denied to set umask.');
+		}
+
+		return localProcess.umask();
+	}
+};
+
+if (optionConsole === 'inherit') {
+	global.console = host.console;
+} else if (optionConsole === 'redirect') {
+	global.console = {
+		debug(...args) {
+			vmEmitArgs('console.debug', args);
+		},
+		log(...args) {
+			vmEmitArgs('console.log', args);
+		},
+		info(...args) {
+			vmEmitArgs('console.info', args);
+		},
+		warn(...args) {
+			vmEmitArgs('console.warn', args);
+		},
+		error(...args) {
+			vmEmitArgs('console.error', args);
+		},
+		dir(...args) {
+			vmEmitArgs('console.dir', args);
+		},
+		time() {},
+		timeEnd() {},
+		trace(...args) {
+			vmEmitArgs('console.trace', args);
+		}
+	};
+}
+
+return {
+	__proto__: null,
+	Module,
+	jsonParse: JSON.parse,
+	createRequireForModule,
+	requireImpl
+};

dist/restore/setup-sandbox.js

@@ -0,0 +1,474 @@
+/* global host, bridge, data, context */
+
+'use strict';
+
+const {
+	Object: localObject,
+	Array: localArray,
+	Error: LocalError,
+	Reflect: localReflect,
+	Proxy: LocalProxy,
+	WeakMap: LocalWeakMap,
+	Function: localFunction,
+	Promise: localPromise,
+	eval: localEval
+} = global;
+
+const {
+	freeze: localObjectFreeze
+} = localObject;
+
+const {
+	getPrototypeOf: localReflectGetPrototypeOf,
+	apply: localReflectApply,
+	deleteProperty: localReflectDeleteProperty,
+	has: localReflectHas,
+	defineProperty: localReflectDefineProperty,
+	setPrototypeOf: localReflectSetPrototypeOf,
+	getOwnPropertyDescriptor: localReflectGetOwnPropertyDescriptor
+} = localReflect;
+
+const {
+	isArray: localArrayIsArray
+} = localArray;
+
+const {
+	ensureThis,
+	ReadOnlyHandler,
+	from,
+	fromWithFactory,
+	readonlyFactory,
+	connect,
+	addProtoMapping,
+	VMError,
+	ReadOnlyMockHandler
+} = bridge;
+
+const {
+	allowAsync,
+	GeneratorFunction,
+	AsyncFunction,
+	AsyncGeneratorFunction
+} = data;
+
+const {
+	get: localWeakMapGet,
+	set: localWeakMapSet
+} = LocalWeakMap.prototype;
+
+function localUnexpected() {
+	return new VMError('Should not happen');
+}
+
+// global is originally prototype of host.Object so it can be used to climb up from the sandbox.
+if (!localReflectSetPrototypeOf(context, localObject.prototype)) throw localUnexpected();
+
+Object.defineProperties(global, {
+	global: {value: global, writable: true, configurable: true, enumerable: true},
+	globalThis: {value: global, writable: true, configurable: true},
+	GLOBAL: {value: global, writable: true, configurable: true},
+	root: {value: global, writable: true, configurable: true},
+	Error: {value: LocalError}
+});
+
+if (!localReflectDefineProperty(global, 'VMError', {
+	__proto__: null,
+	value: VMError,
+	writable: true,
+	enumerable: false,
+	configurable: true
+})) throw localUnexpected();
+
+// Fixes buffer unsafe allocation
+/* eslint-disable no-use-before-define */
+class BufferHandler extends ReadOnlyHandler {
+
+	apply(target, thiz, args) {
+		if (args.length > 0 && typeof args[0] === 'number') {
+			return LocalBuffer.alloc(args[0]);
+		}
+		return localReflectApply(LocalBuffer.from, LocalBuffer, args);
+	}
+
+	construct(target, args, newTarget) {
+		if (args.length > 0 && typeof args[0] === 'number') {
+			return LocalBuffer.alloc(args[0]);
+		}
+		return localReflectApply(LocalBuffer.from, LocalBuffer, args);
+	}
+
+}
+/* eslint-enable no-use-before-define */
+
+const LocalBuffer = fromWithFactory(obj => new BufferHandler(obj), host.Buffer);
+
+
+if (!localReflectDefineProperty(global, 'Buffer', {
+	__proto__: null,
+	value: LocalBuffer,
+	writable: true,
+	enumerable: false,
+	configurable: true
+})) throw localUnexpected();
+
+addProtoMapping(LocalBuffer.prototype, host.Buffer.prototype, 'Uint8Array');
+
+/**
+ *
+ * @param {*} size Size of new buffer
+ * @this LocalBuffer
+ * @return {LocalBuffer}
+ */
+function allocUnsafe(size) {
+	return LocalBuffer.alloc(size);
+}
+
+connect(allocUnsafe, host.Buffer.allocUnsafe);
+
+/**
+ *
+ * @param {*} size Size of new buffer
+ * @this LocalBuffer
+ * @return {LocalBuffer}
+ */
+function allocUnsafeSlow(size) {
+	return LocalBuffer.alloc(size);
+}
+
+connect(allocUnsafeSlow, host.Buffer.allocUnsafeSlow);
+
+/**
+ * Replacement for Buffer inspect
+ *
+ * @param {*} recurseTimes
+ * @param {*} ctx
+ * @this LocalBuffer
+ * @return {string}
+ */
+function inspect(recurseTimes, ctx) {
+	// Mimic old behavior, could throw but didn't pass a test.
+	const max = host.INSPECT_MAX_BYTES;
+	const actualMax = Math.min(max, this.length);
+	const remaining = this.length - max;
+	let str = this.hexSlice(0, actualMax).replace(/(.{2})/g, '$1 ').trim();
+	if (remaining > 0) str += ` ... ${remaining} more byte${remaining > 1 ? 's' : ''}`;
+	return `<${this.constructor.name} ${str}>`;
+}
+
+connect(inspect, host.Buffer.prototype.inspect);
+
+connect(localFunction.prototype.bind, host.Function.prototype.bind);
+
+connect(localObject.prototype.__defineGetter__, host.Object.prototype.__defineGetter__);
+connect(localObject.prototype.__defineSetter__, host.Object.prototype.__defineSetter__);
+connect(localObject.prototype.__lookupGetter__, host.Object.prototype.__lookupGetter__);
+connect(localObject.prototype.__lookupSetter__, host.Object.prototype.__lookupSetter__);
+
+/*
+ * PrepareStackTrace sanitization
+ */
+
+const oldPrepareStackTraceDesc = localReflectGetOwnPropertyDescriptor(LocalError, 'prepareStackTrace');
+
+let currentPrepareStackTrace = LocalError.prepareStackTrace;
+const wrappedPrepareStackTrace = new LocalWeakMap();
+if (typeof currentPrepareStackTrace === 'function') {
+	wrappedPrepareStackTrace.set(currentPrepareStackTrace, currentPrepareStackTrace);
+}
+
+let OriginalCallSite;
+LocalError.prepareStackTrace = (e, sst) => {
+	OriginalCallSite = sst[0].constructor;
+};
+new LocalError().stack;
+if (typeof OriginalCallSite === 'function') {
+	LocalError.prepareStackTrace = undefined;
+
+	function makeCallSiteGetters(list) {
+		const callSiteGetters = [];
+		for (let i=0; i<list.length; i++) {
+			const name = list[i];
+			const func = OriginalCallSite.prototype[name];
+			callSiteGetters[i] = {__proto__: null,
+				name,
+				propName: '_' + name,
+				func: (thiz) => {
+					return localReflectApply(func, thiz, []);
+				}
+			};
+		}
+		return callSiteGetters;
+	}
+
+	function applyCallSiteGetters(thiz, callSite, getters) {
+		for (let i=0; i<getters.length; i++) {
+			const getter = getters[i];
+			localReflectDefineProperty(thiz, getter.propName, {
+				__proto__: null,
+				value: getter.func(callSite)
+			});
+		}
+	}
+
+	const callSiteGetters = makeCallSiteGetters([
+		'getTypeName',
+		'getFunctionName',
+		'getMethodName',
+		'getFileName',
+		'getLineNumber',
+		'getColumnNumber',
+		'getEvalOrigin',
+		'isToplevel',
+		'isEval',
+		'isNative',
+		'isConstructor',
+		'isAsync',
+		'isPromiseAll',
+		'getPromiseIndex'
+	]);
+
+	class CallSite {
+		constructor(callSite) {
+			applyCallSiteGetters(this, callSite, callSiteGetters);
+		}
+		getThis() {
+			return undefined;
+		}
+		getFunction() {
+			return undefined;
+		}
+		toString() {
+			return 'CallSite {}';
+		}
+	}
+
+
+	for (let i=0; i<callSiteGetters.length; i++) {
+		const name = callSiteGetters[i].name;
+		const funcProp = localReflectGetOwnPropertyDescriptor(OriginalCallSite.prototype, name);
+		if (!funcProp) continue;
+		const propertyName = callSiteGetters[i].propName;
+		const func = {func() {
+			return this[propertyName];
+		}}.func;
+		const nameProp = localReflectGetOwnPropertyDescriptor(func, 'name');
+		if (!nameProp) throw localUnexpected();
+		nameProp.value = name;
+		if (!localReflectDefineProperty(func, 'name', nameProp)) throw localUnexpected();
+		funcProp.value = func;
+		if (!localReflectDefineProperty(CallSite.prototype, name, funcProp)) throw localUnexpected();
+	}
+
+	if (!localReflectDefineProperty(LocalError, 'prepareStackTrace', {
+		configurable: false,
+		enumerable: false,
+		get() {
+			return currentPrepareStackTrace;
+		},
+		set(value) {
+			if (typeof(value) !== 'function') {
+				currentPrepareStackTrace = value;
+				return;
+			}
+			const wrapped = localReflectApply(localWeakMapGet, wrappedPrepareStackTrace, [value]);
+			if (wrapped) {
+				currentPrepareStackTrace = wrapped;
+				return;
+			}
+			const newWrapped = (error, sst) => {
+				const sandboxSst = ensureThis(sst);
+				if (localArrayIsArray(sst)) {
+					if (sst === sandboxSst) {
+						for (let i=0; i < sst.length; i++) {
+							const cs = sst[i];
+							if (typeof cs === 'object' && localReflectGetPrototypeOf(cs) === OriginalCallSite.prototype) {
+								sst[i] = new CallSite(cs);
+							}
+						}
+					} else {
+						sst = [];
+						for (let i=0; i < sandboxSst.length; i++) {
+							const cs = sandboxSst[i];
+							localReflectDefineProperty(sst, i, {
+								__proto__: null,
+								value: new CallSite(cs),
+								enumerable: true,
+								configurable: true,
+								writable: true
+							});
+						}
+					}
+				} else {
+					sst = sandboxSst;
+				}
+				return value(error, sst);
+			};
+			localReflectApply(localWeakMapSet, wrappedPrepareStackTrace, [value, newWrapped]);
+			localReflectApply(localWeakMapSet, wrappedPrepareStackTrace, [newWrapped, newWrapped]);
+			currentPrepareStackTrace = newWrapped;
+		}
+	})) throw localUnexpected();
+} else if (oldPrepareStackTraceDesc) {
+	localReflectDefineProperty(LocalError, 'prepareStackTrace', oldPrepareStackTraceDesc);
+} else {
+	localReflectDeleteProperty(LocalError, 'prepareStackTrace');
+}
+
+/*
+ * Exception sanitization
+ */
+
+const withProxy = localObjectFreeze({
+	__proto__: null,
+	has(target, key) {
+		if (key === host.INTERNAL_STATE_NAME) return false;
+		return localReflectHas(target, key);
+	}
+});
+
+const interanState = localObjectFreeze({
+	__proto__: null,
+	wrapWith(x) {
+		if (x === null || x === undefined) return x;
+		return new LocalProxy(localObject(x), withProxy);
+	},
+	handleException: ensureThis,
+	import(what) {
+		throw new VMError('Dynamic Import not supported');
+	}
+});
+
+if (!localReflectDefineProperty(global, host.INTERNAL_STATE_NAME, {
+	__proto__: null,
+	configurable: false,
+	enumerable: false,
+	writable: false,
+	value: interanState
+})) throw localUnexpected();
+
+/*
+ * Eval sanitization
+ */
+
+function throwAsync() {
+	return new VMError('Async not available');
+}
+
+function makeFunction(inputArgs, isAsync, isGenerator) {
+	const lastArgs = inputArgs.length - 1;
+	let code = lastArgs >= 0 ? `${inputArgs[lastArgs]}` : '';
+	let args = lastArgs > 0 ? `${inputArgs[0]}` : '';
+	for (let i = 1; i < lastArgs; i++) {
+		args += `,${inputArgs[i]}`;
+	}
+	try {
+		code = host.transformAndCheck(args, code, isAsync, isGenerator, allowAsync);
+	} catch (e) {
+		throw bridge.from(e);
+	}
+	return localEval(code);
+}
+
+const FunctionHandler = {
+	__proto__: null,
+	apply(target, thiz, args) {
+		return makeFunction(args, this.isAsync, this.isGenerator);
+	},
+	construct(target, args, newTarget) {
+		return makeFunction(args, this.isAsync, this.isGenerator);
+	}
+};
+
+const EvalHandler = {
+	__proto__: null,
+	apply(target, thiz, args) {
+		if (args.length === 0) return undefined;
+		let code = `${args[0]}`;
+		try {
+			code = host.transformAndCheck(null, code, false, false, allowAsync);
+		} catch (e) {
+			throw bridge.from(e);
+		}
+		return localEval(code);
+	}
+};
+
+const AsyncErrorHandler = {
+	__proto__: null,
+	apply(target, thiz, args) {
+		throw throwAsync();
+	},
+	construct(target, args, newTarget) {
+		throw throwAsync();
+	}
+};
+
+function makeCheckFunction(isAsync, isGenerator) {
+	if (isAsync && !allowAsync) return AsyncErrorHandler;
+	return {
+		__proto__: FunctionHandler,
+		isAsync,
+		isGenerator
+	};
+}
+
+function overrideWithProxy(obj, prop, value, handler) {
+	const proxy = new LocalProxy(value, handler);
+	if (!localReflectDefineProperty(obj, prop, {__proto__: null, value: proxy})) throw localUnexpected();
+	return proxy;
+}
+
+const proxiedFunction = overrideWithProxy(localFunction.prototype, 'constructor', localFunction, makeCheckFunction(false, false));
+if (GeneratorFunction) {
+	if (!localReflectSetPrototypeOf(GeneratorFunction, proxiedFunction)) throw localUnexpected();
+	overrideWithProxy(GeneratorFunction.prototype, 'constructor', GeneratorFunction, makeCheckFunction(false, true));
+}
+if (AsyncFunction) {
+	if (!localReflectSetPrototypeOf(AsyncFunction, proxiedFunction)) throw localUnexpected();
+	overrideWithProxy(AsyncFunction.prototype, 'constructor', AsyncFunction, makeCheckFunction(true, false));
+}
+if (AsyncGeneratorFunction) {
+	if (!localReflectSetPrototypeOf(AsyncGeneratorFunction, proxiedFunction)) throw localUnexpected();
+	overrideWithProxy(AsyncGeneratorFunction.prototype, 'constructor', AsyncGeneratorFunction, makeCheckFunction(true, true));
+}
+
+global.Function = proxiedFunction;
+global.eval = new LocalProxy(localEval, EvalHandler);
+
+/*
+ * Promise sanitization
+ */
+
+if (localPromise && !allowAsync) {
+
+	const PromisePrototype = localPromise.prototype;
+
+	overrideWithProxy(PromisePrototype, 'then', PromisePrototype.then, AsyncErrorHandler);
+	// This seems not to work, and will produce
+	// UnhandledPromiseRejectionWarning: TypeError: Method Promise.prototype.then called on incompatible receiver [object Object].
+	// This is likely caused since the host.Promise.prototype.then cannot use the VM Proxy object.
+	// Contextify.connect(host.Promise.prototype.then, Promise.prototype.then);
+
+	if (PromisePrototype.finally) {
+		overrideWithProxy(PromisePrototype, 'finally', PromisePrototype.finally, AsyncErrorHandler);
+		// Contextify.connect(host.Promise.prototype.finally, Promise.prototype.finally);
+	}
+	if (Promise.prototype.catch) {
+		overrideWithProxy(PromisePrototype, 'catch', PromisePrototype.catch, AsyncErrorHandler);
+		// Contextify.connect(host.Promise.prototype.catch, Promise.prototype.catch);
+	}
+
+}
+
+function readonly(other, mock) {
+	// Note: other@other(unsafe) mock@other(unsafe) returns@this(unsafe) throws@this(unsafe)
+	if (!mock) return fromWithFactory(readonlyFactory, other);
+	const tmock = from(mock);
+	return fromWithFactory(obj=>new ReadOnlyMockHandler(obj, tmock), other);
+}
+
+return {
+	__proto__: null,
+	readonly,
+	global
+};

dist/save-only/bridge.js

@@ -0,0 +1,1010 @@
+'use strict';
+
+/**
+ * __        ___    ____  _   _ ___ _   _  ____
+ * \ \      / / \  |  _ \| \ | |_ _| \ | |/ ___|
+ *  \ \ /\ / / _ \ | |_) |  \| || ||  \| | |  _
+ *   \ V  V / ___ \|  _ <| |\  || || |\  | |_| |
+ *    \_/\_/_/   \_\_| \_\_| \_|___|_| \_|\____|
+ *
+ * This file is critical for vm2. It implements the bridge between the host and the sandbox.
+ * If you do not know exactly what you are doing, you should NOT edit this file.
+ *
+ * The file is loaded in the host and sandbox to handle objects in both directions.
+ * This is done to ensure that RangeErrors are from the correct context.
+ * The boundary between the sandbox and host might throw RangeErrors from both contexts.
+ * Therefore, thisFromOther and friends can handle objects from both domains.
+ *
+ * Method parameters have comments to tell from which context they came.
+ *
+ */
+
+const globalsList = [
+	'Number',
+	'String',
+	'Boolean',
+	'Date',
+	'RegExp',
+	'Map',
+	'WeakMap',
+	'Set',
+	'WeakSet',
+	'Promise',
+	'Function'
+];
+
+const errorsList = [
+	'RangeError',
+	'ReferenceError',
+	'SyntaxError',
+	'TypeError',
+	'EvalError',
+	'URIError',
+	'Error'
+];
+
+const OPNA = 'Operation not allowed on contextified object.';
+
+const thisGlobalPrototypes = {
+	__proto__: null,
+	Object: Object.prototype,
+	Array: Array.prototype
+};
+
+for (let i = 0; i < globalsList.length; i++) {
+	const key = globalsList[i];
+	const g = global[key];
+	if (g) thisGlobalPrototypes[key] = g.prototype;
+}
+
+for (let i = 0; i < errorsList.length; i++) {
+	const key = errorsList[i];
+	const g = global[key];
+	if (g) thisGlobalPrototypes[key] = g.prototype;
+}
+
+const {
+	getPrototypeOf: thisReflectGetPrototypeOf,
+	setPrototypeOf: thisReflectSetPrototypeOf,
+	defineProperty: thisReflectDefineProperty,
+	deleteProperty: thisReflectDeleteProperty,
+	getOwnPropertyDescriptor: thisReflectGetOwnPropertyDescriptor,
+	isExtensible: thisReflectIsExtensible,
+	preventExtensions: thisReflectPreventExtensions,
+	apply: thisReflectApply,
+	construct: thisReflectConstruct,
+	set: thisReflectSet,
+	get: thisReflectGet,
+	has: thisReflectHas,
+	ownKeys: thisReflectOwnKeys,
+	enumerate: thisReflectEnumerate,
+} = Reflect;
+
+const thisObject = Object;
+const {
+	freeze: thisObjectFreeze,
+	prototype: thisObjectPrototype
+} = thisObject;
+const thisObjectHasOwnProperty = thisObjectPrototype.hasOwnProperty;
+const ThisProxy = Proxy;
+const ThisWeakMap = WeakMap;
+const {
+	get: thisWeakMapGet,
+	set: thisWeakMapSet
+} = ThisWeakMap.prototype;
+const ThisMap = Map;
+const thisMapGet = ThisMap.prototype.get;
+const thisMapSet = ThisMap.prototype.set;
+const thisFunction = Function;
+const thisFunctionBind = thisFunction.prototype.bind;
+const thisArrayIsArray = Array.isArray;
+const thisErrorCaptureStackTrace = Error.captureStackTrace;
+
+const thisSymbolToString = Symbol.prototype.toString;
+const thisSymbolToStringTag = Symbol.toStringTag;
+const thisSymbolIterator = Symbol.iterator;
+const thisSymbolNodeJSUtilInspectCustom = Symbol.for('nodejs.util.inspect.custom');
+
+/**
+ * VMError.
+ *
+ * @public
+ * @extends {Error}
+ */
+class VMError extends Error {
+
+	/**
+	 * Create VMError instance.
+	 *
+	 * @public
+	 * @param {string} message - Error message.
+	 * @param {string} code - Error code.
+	 */
+	constructor(message, code) {
+		super(message);
+
+		this.name = 'VMError';
+		this.code = code;
+
+		thisErrorCaptureStackTrace(this, this.constructor);
+	}
+}
+
+thisGlobalPrototypes['VMError'] = VMError.prototype;
+
+function thisUnexpected() {
+	return new VMError('Unexpected');
+}
+
+if (!thisReflectSetPrototypeOf(exports, null)) throw thisUnexpected();
+
+function thisSafeGetOwnPropertyDescriptor(obj, key) {
+	const desc = thisReflectGetOwnPropertyDescriptor(obj, key);
+	if (!desc) return desc;
+	if (!thisReflectSetPrototypeOf(desc, null)) throw thisUnexpected();
+	return desc;
+}
+
+function thisThrowCallerCalleeArgumentsAccess(key) {
+	'use strict';
+	thisThrowCallerCalleeArgumentsAccess[key];
+	return thisUnexpected();
+}
+
+function thisIdMapping(factory, other) {
+	return other;
+}
+
+const thisThrowOnKeyAccessHandler = thisObjectFreeze({
+	__proto__: null,
+	get(target, key, receiver) {
+		if (typeof key === 'symbol') {
+			key = thisReflectApply(thisSymbolToString, key, []);
+		}
+		throw new VMError(`Unexpected access to key '${key}'`);
+	}
+});
+
+const emptyForzenObject = thisObjectFreeze({
+	__proto__: null
+});
+
+const thisThrowOnKeyAccess = new ThisProxy(emptyForzenObject, thisThrowOnKeyAccessHandler);
+
+function SafeBase() {}
+
+if (!thisReflectDefineProperty(SafeBase, 'prototype', {
+	__proto__: null,
+	value: thisThrowOnKeyAccess
+})) throw thisUnexpected();
+
+function SHARED_FUNCTION() {}
+
+const TEST_PROXY_HANDLER = thisObjectFreeze({
+	__proto__: thisThrowOnKeyAccess,
+	construct() {
+		return this;
+	}
+});
+
+function thisIsConstructor(obj) {
+	// Note: obj@any(unsafe)
+	const Func = new ThisProxy(obj, TEST_PROXY_HANDLER);
+	try {
+		// eslint-disable-next-line no-new
+		new Func();
+		return true;
+	} catch (e) {
+		return false;
+	}
+}
+
+function thisCreateTargetObject(obj, proto) {
+	// Note: obj@any(unsafe) proto@any(unsafe) returns@this(unsafe) throws@this(unsafe)
+	let base;
+	if (typeof obj === 'function') {
+		if (thisIsConstructor(obj)) {
+			// Bind the function since bound functions do not have a prototype property.
+			base = thisReflectApply(thisFunctionBind, SHARED_FUNCTION, [null]);
+		} else {
+			base = () => {};
+		}
+	} else if (thisArrayIsArray(obj)) {
+		base = [];
+	} else {
+		return {__proto__: proto};
+	}
+	if (!thisReflectSetPrototypeOf(base, proto)) throw thisUnexpected();
+	return base;
+}
+
+function createBridge(otherInit, registerProxy) {
+
+	const mappingOtherToThis = new ThisWeakMap();
+	const protoMappings = new ThisMap();
+	const protoName = new ThisMap();
+
+	function thisAddProtoMapping(proto, other, name) {
+		// Note: proto@this(unsafe) other@other(unsafe) name@this(unsafe) throws@this(unsafe)
+		thisReflectApply(thisMapSet, protoMappings, [proto, thisIdMapping]);
+		thisReflectApply(thisMapSet, protoMappings, [other,
+			(factory, object) => thisProxyOther(factory, object, proto)]);
+		if (name) thisReflectApply(thisMapSet, protoName, [proto, name]);
+	}
+
+	function thisAddProtoMappingFactory(protoFactory, other, name) {
+		// Note: protoFactory@this(unsafe) other@other(unsafe) name@this(unsafe) throws@this(unsafe)
+		let proto;
+		thisReflectApply(thisMapSet, protoMappings, [other,
+			(factory, object) => {
+				if (!proto) {
+					proto = protoFactory();
+					thisReflectApply(thisMapSet, protoMappings, [proto, thisIdMapping]);
+					if (name) thisReflectApply(thisMapSet, protoName, [proto, name]);
+				}
+				return thisProxyOther(factory, object, proto);
+			}]);
+	}
+
+	const result = {
+		__proto__: null,
+		globalPrototypes: thisGlobalPrototypes,
+		safeGetOwnPropertyDescriptor: thisSafeGetOwnPropertyDescriptor,
+		fromArguments: thisFromOtherArguments,
+		from: thisFromOther,
+		fromWithFactory: thisFromOtherWithFactory,
+		ensureThis: thisEnsureThis,
+		mapping: mappingOtherToThis,
+		connect: thisConnect,
+		reflectSet: thisReflectSet,
+		reflectGet: thisReflectGet,
+		reflectDefineProperty: thisReflectDefineProperty,
+		reflectDeleteProperty: thisReflectDeleteProperty,
+		reflectApply: thisReflectApply,
+		reflectConstruct: thisReflectConstruct,
+		reflectHas: thisReflectHas,
+		reflectOwnKeys: thisReflectOwnKeys,
+		reflectEnumerate: thisReflectEnumerate,
+		reflectGetPrototypeOf: thisReflectGetPrototypeOf,
+		reflectIsExtensible: thisReflectIsExtensible,
+		reflectPreventExtensions: thisReflectPreventExtensions,
+		objectHasOwnProperty: thisObjectHasOwnProperty,
+		weakMapSet: thisWeakMapSet,
+		addProtoMapping: thisAddProtoMapping,
+		addProtoMappingFactory: thisAddProtoMappingFactory,
+		defaultFactory,
+		protectedFactory,
+		readonlyFactory,
+		VMError
+	};
+
+	const isHost = typeof otherInit !== 'object';
+
+	if (isHost) {
+		otherInit = otherInit(result, registerProxy);
+	}
+
+	result.other = otherInit;
+
+	const {
+		globalPrototypes: otherGlobalPrototypes,
+		safeGetOwnPropertyDescriptor: otherSafeGetOwnPropertyDescriptor,
+		fromArguments: otherFromThisArguments,
+		from: otherFromThis,
+		mapping: mappingThisToOther,
+		reflectSet: otherReflectSet,
+		reflectGet: otherReflectGet,
+		reflectDefineProperty: otherReflectDefineProperty,
+		reflectDeleteProperty: otherReflectDeleteProperty,
+		reflectApply: otherReflectApply,
+		reflectConstruct: otherReflectConstruct,
+		reflectHas: otherReflectHas,
+		reflectOwnKeys: otherReflectOwnKeys,
+		reflectEnumerate: otherReflectEnumerate,
+		reflectGetPrototypeOf: otherReflectGetPrototypeOf,
+		reflectIsExtensible: otherReflectIsExtensible,
+		reflectPreventExtensions: otherReflectPreventExtensions,
+		objectHasOwnProperty: otherObjectHasOwnProperty,
+		weakMapSet: otherWeakMapSet
+	} = otherInit;
+
+	function thisOtherHasOwnProperty(object, key) {
+		// Note: object@other(safe) key@prim throws@this(unsafe)
+		try {
+			return otherReflectApply(otherObjectHasOwnProperty, object, [key]) === true;
+		} catch (e) { // @other(unsafe)
+			throw thisFromOtherForThrow(e);
+		}
+	}
+
+	function thisDefaultGet(handler, object, key, desc) {
+		// Note: object@other(unsafe) key@prim desc@other(safe)
+		let ret; // @other(unsafe)
+		if (desc.get || desc.set) {
+			const getter = desc.get;
+			if (!getter) return undefined;
+			try {
+				ret = otherReflectApply(getter, object, [key]);
+			} catch (e) {
+				throw thisFromOtherForThrow(e);
+			}
+		} else {
+			ret = desc.value;
+		}
+		return handler.fromOtherWithContext(ret);
+	}
+
+	function otherFromThisIfAvailable(to, from, key) {
+		// Note: to@other(safe) from@this(safe) key@prim throws@this(unsafe)
+		if (!thisReflectApply(thisObjectHasOwnProperty, from, [key])) return false;
+		try {
+			to[key] = otherFromThis(from[key]);
+		} catch (e) { // @other(unsafe)
+			throw thisFromOtherForThrow(e);
+		}
+		return true;
+	}
+
+	class BaseHandler extends SafeBase {
+
+		constructor(object) {
+			// Note: object@other(unsafe) throws@this(unsafe)
+			super();
+			this.objectWrapper = () => object;
+		}
+
+		getObject() {
+			return this.objectWrapper();
+		}
+
+		getFactory() {
+			return defaultFactory;
+		}
+
+		fromOtherWithContext(other) {
+			// Note: other@other(unsafe) throws@this(unsafe)
+			return thisFromOtherWithFactory(this.getFactory(), other);
+		}
+
+		doPreventExtensions(target, object, factory) {
+			// Note: target@this(unsafe) object@other(unsafe) throws@this(unsafe)
+			let keys; // @other(safe-array-of-prim)
+			try {
+				keys = otherReflectOwnKeys(object);
+			} catch (e) { // @other(unsafe)
+				throw thisFromOtherForThrow(e);
+			}
+			for (let i = 0; i < keys.length; i++) {
+				const key = keys[i]; // @prim
+				let desc;
+				try {
+					desc = otherSafeGetOwnPropertyDescriptor(object, key);
+				} catch (e) { // @other(unsafe)
+					throw thisFromOtherForThrow(e);
+				}
+				if (!desc) continue;
+				if (!desc.configurable) {
+					const current = thisSafeGetOwnPropertyDescriptor(target, key);
+					if (current && !current.configurable) continue;
+					if (desc.get || desc.set) {
+						desc.get = this.fromOtherWithContext(desc.get);
+						desc.set = this.fromOtherWithContext(desc.set);
+					} else if (typeof object === 'function' && (key === 'caller' || key === 'callee' || key === 'arguments')) {
+						desc.value = null;
+					} else {
+						desc.value = this.fromOtherWithContext(desc.value);
+					}
+				} else {
+					if (desc.get || desc.set) {
+						desc = {
+							__proto__: null,
+							configurable: true,
+							enumerable: desc.enumerable,
+							writable: true,
+							value: null
+						};
+					} else {
+						desc.value = null;
+					}
+				}
+				if (!thisReflectDefineProperty(target, key, desc)) throw thisUnexpected();
+			}
+			if (!thisReflectPreventExtensions(target)) throw thisUnexpected();
+		}
+
+		get(target, key, receiver) {
+			// Note: target@this(unsafe) key@prim receiver@this(unsafe) throws@this(unsafe)
+			const object = this.getObject(); // @other(unsafe)
+			switch (key) {
+				case 'constructor': {
+					const desc = otherSafeGetOwnPropertyDescriptor(object, key);
+					if (desc) return thisDefaultGet(this, object, key, desc);
+					const proto = thisReflectGetPrototypeOf(target);
+					return proto === null ? undefined : proto.constructor;
+				}
+				case '__proto__': {
+					const desc = otherSafeGetOwnPropertyDescriptor(object, key);
+					if (desc) return thisDefaultGet(this, object, key, desc);
+					return thisReflectGetPrototypeOf(target);
+				}
+				case thisSymbolToStringTag:
+					if (!thisOtherHasOwnProperty(object, thisSymbolToStringTag)) {
+						const proto = thisReflectGetPrototypeOf(target);
+						const name = thisReflectApply(thisMapGet, protoName, [proto]);
+						if (name) return name;
+					}
+					break;
+				case 'arguments':
+				case 'caller':
+				case 'callee':
+					if (typeof object === 'function' && thisOtherHasOwnProperty(object, key)) {
+						throw thisThrowCallerCalleeArgumentsAccess(key);
+					}
+					break;
+			}
+			let ret; // @other(unsafe)
+			try {
+				ret = otherReflectGet(object, key);
+			} catch (e) { // @other(unsafe)
+				throw thisFromOtherForThrow(e);
+			}
+			return this.fromOtherWithContext(ret);
+		}
+
+		set(target, key, value, receiver) {
+			// Note: target@this(unsafe) key@prim value@this(unsafe) receiver@this(unsafe) throws@this(unsafe)
+			const object = this.getObject(); // @other(unsafe)
+			if (key === '__proto__' && !thisOtherHasOwnProperty(object, key)) {
+				return this.setPrototypeOf(target, value);
+			}
+			try {
+				value = otherFromThis(value);
+				return otherReflectSet(object, key, value) === true;
+			} catch (e) { // @other(unsafe)
+				throw thisFromOtherForThrow(e);
+			}
+		}
+
+		getPrototypeOf(target) {
+			// Note: target@this(unsafe)
+			return thisReflectGetPrototypeOf(target);
+		}
+
+		setPrototypeOf(target, value) {
+			// Note: target@this(unsafe) throws@this(unsafe)
+			throw new VMError(OPNA);
+		}
+
+		apply(target, context, args) {
+			// Note: target@this(unsafe) context@this(unsafe) args@this(safe-array) throws@this(unsafe)
+			const object = this.getObject(); // @other(unsafe)
+			let ret; // @other(unsafe)
+			try {
+				context = otherFromThis(context);
+				args = otherFromThisArguments(args);
+				ret = otherReflectApply(object, context, args);
+			} catch (e) { // @other(unsafe)
+				throw thisFromOtherForThrow(e);
+			}
+			return thisFromOther(ret);
+		}
+
+		construct(target, args, newTarget) {
+			// Note: target@this(unsafe) args@this(safe-array) newTarget@this(unsafe) throws@this(unsafe)
+			const object = this.getObject(); // @other(unsafe)
+			let ret; // @other(unsafe)
+			try {
+				args = otherFromThisArguments(args);
+				ret = otherReflectConstruct(object, args);
+			} catch (e) { // @other(unsafe)
+				throw thisFromOtherForThrow(e);
+			}
+			return thisFromOtherWithFactory(this.getFactory(), ret, thisFromOther(object));
+		}
+
+		getOwnPropertyDescriptorDesc(target, prop, desc) {
+			// Note: target@this(unsafe) prop@prim desc@other{safe} throws@this(unsafe)
+			const object = this.getObject(); // @other(unsafe)
+			if (desc && typeof object === 'function' && (prop === 'arguments' || prop === 'caller' || prop === 'callee')) desc.value = null;
+			return desc;
+		}
+
+		getOwnPropertyDescriptor(target, prop) {
+			// Note: target@this(unsafe) prop@prim throws@this(unsafe)
+			const object = this.getObject(); // @other(unsafe)
+			let desc; // @other(safe)
+			try {
+				desc = otherSafeGetOwnPropertyDescriptor(object, prop);
+			} catch (e) { // @other(unsafe)
+				throw thisFromOtherForThrow(e);
+			}
+
+			desc = this.getOwnPropertyDescriptorDesc(target, prop, desc);
+
+			if (!desc) return undefined;
+
+			let thisDesc;
+			if (desc.get || desc.set) {
+				thisDesc = {
+					__proto__: null,
+					get: this.fromOtherWithContext(desc.get),
+					set: this.fromOtherWithContext(desc.set),
+					enumerable: desc.enumerable === true,
+					configurable: desc.configurable === true
+				};
+			} else {
+				thisDesc = {
+					__proto__: null,
+					value: this.fromOtherWithContext(desc.value),
+					writable: desc.writable === true,
+					enumerable: desc.enumerable === true,
+					configurable: desc.configurable === true
+				};
+			}
+			if (!thisDesc.configurable) {
+				const oldDesc = thisSafeGetOwnPropertyDescriptor(target, prop);
+				if (!oldDesc || oldDesc.configurable || oldDesc.writable !== thisDesc.writable) {
+					if (!thisReflectDefineProperty(target, prop, thisDesc)) throw thisUnexpected();
+				}
+			}
+			return thisDesc;
+		}
+
+		definePropertyDesc(target, prop, desc) {
+			// Note: target@this(unsafe) prop@prim desc@this(safe) throws@this(unsafe)
+			return desc;
+		}
+
+		defineProperty(target, prop, desc) {
+			// Note: target@this(unsafe) prop@prim desc@this(unsafe) throws@this(unsafe)
+			const object = this.getObject(); // @other(unsafe)
+			if (!thisReflectSetPrototypeOf(desc, null)) throw thisUnexpected();
+
+			desc = this.definePropertyDesc(target, prop, desc);
+
+			if (!desc) return false;
+
+			let otherDesc = {__proto__: null};
+			let hasFunc = true;
+			let hasValue = true;
+			let hasBasic = true;
+			hasFunc &= otherFromThisIfAvailable(otherDesc, desc, 'get');
+			hasFunc &= otherFromThisIfAvailable(otherDesc, desc, 'set');
+			hasValue &= otherFromThisIfAvailable(otherDesc, desc, 'value');
+			hasValue &= otherFromThisIfAvailable(otherDesc, desc, 'writable');
+			hasBasic &= otherFromThisIfAvailable(otherDesc, desc, 'enumerable');
+			hasBasic &= otherFromThisIfAvailable(otherDesc, desc, 'configurable');
+
+			try {
+				if (!otherReflectDefineProperty(object, prop, otherDesc)) return false;
+				if (otherDesc.configurable !== true && (!hasBasic || !(hasFunc || hasValue))) {
+					otherDesc = otherSafeGetOwnPropertyDescriptor(object, prop);
+				}
+			} catch (e) { // @other(unsafe)
+				throw thisFromOtherForThrow(e);
+			}
+
+			if (!otherDesc.configurable) {
+				let thisDesc;
+				if (otherDesc.get || otherDesc.set) {
+					thisDesc = {
+						__proto__: null,
+						get: this.fromOtherWithContext(otherDesc.get),
+						set: this.fromOtherWithContext(otherDesc.set),
+						enumerable: otherDesc.enumerable,
+						configurable: otherDesc.configurable
+					};
+				} else {
+					thisDesc = {
+						__proto__: null,
+						value: this.fromOtherWithContext(otherDesc.value),
+						writable: otherDesc.writable,
+						enumerable: otherDesc.enumerable,
+						configurable: otherDesc.configurable
+					};
+				}
+				if (!thisReflectDefineProperty(target, prop, thisDesc)) throw thisUnexpected();
+			}
+			return true;
+		}
+
+		deleteProperty(target, prop) {
+			// Note: target@this(unsafe) prop@prim throws@this(unsafe)
+			const object = this.getObject(); // @other(unsafe)
+			try {
+				return otherReflectDeleteProperty(object, prop) === true;
+			} catch (e) { // @other(unsafe)
+				throw thisFromOtherForThrow(e);
+			}
+		}
+
+		has(target, key) {
+			// Note: target@this(unsafe) key@prim throws@this(unsafe)
+			const object = this.getObject(); // @other(unsafe)
+			try {
+				return otherReflectHas(object, key) === true;
+			} catch (e) { // @other(unsafe)
+				throw thisFromOtherForThrow(e);
+			}
+		}
+
+		isExtensible(target) {
+			// Note: target@this(unsafe) throws@this(unsafe)
+			const object = this.getObject(); // @other(unsafe)
+			try {
+				if (otherReflectIsExtensible(object)) return true;
+			} catch (e) { // @other(unsafe)
+				throw thisFromOtherForThrow(e);
+			}
+			if (thisReflectIsExtensible(target)) {
+				this.doPreventExtensions(target, object, this);
+			}
+			return false;
+		}
+
+		ownKeys(target) {
+			// Note: target@this(unsafe) throws@this(unsafe)
+			const object = this.getObject(); // @other(unsafe)
+			let res; // @other(unsafe)
+			try {
+				res = otherReflectOwnKeys(object);
+			} catch (e) { // @other(unsafe)
+				throw thisFromOtherForThrow(e);
+			}
+			return thisFromOther(res);
+		}
+
+		preventExtensions(target) {
+			// Note: target@this(unsafe) throws@this(unsafe)
+			const object = this.getObject(); // @other(unsafe)
+			try {
+				if (!otherReflectPreventExtensions(object)) return false;
+			} catch (e) { // @other(unsafe)
+				throw thisFromOtherForThrow(e);
+			}
+			if (thisReflectIsExtensible(target)) {
+				this.doPreventExtensions(target, object, this);
+			}
+			return true;
+		}
+
+		enumerate(target) {
+			// Note: target@this(unsafe) throws@this(unsafe)
+			const object = this.getObject(); // @other(unsafe)
+			let res; // @other(unsafe)
+			try {
+				res = otherReflectEnumerate(object);
+			} catch (e) { // @other(unsafe)
+				throw thisFromOtherForThrow(e);
+			}
+			return this.fromOtherWithContext(res);
+		}
+
+	}
+
+	BaseHandler.prototype[thisSymbolNodeJSUtilInspectCustom] = undefined;
+	BaseHandler.prototype[thisSymbolToStringTag] = 'VM2 Wrapper';
+	BaseHandler.prototype[thisSymbolIterator] = undefined;
+
+	function defaultFactory(object) {
+		// Note: other@other(unsafe) returns@this(unsafe) throws@this(unsafe)
+		return new BaseHandler(object);
+	}
+
+	class ProtectedHandler extends BaseHandler {
+
+		getFactory() {
+			return protectedFactory;
+		}
+
+		set(target, key, value, receiver) {
+			// Note: target@this(unsafe) key@prim value@this(unsafe) receiver@this(unsafe) throws@this(unsafe)
+			if (typeof value === 'function') {
+				return thisReflectDefineProperty(receiver, key, {
+					__proto__: null,
+					value: value,
+					writable: true,
+					enumerable: true,
+					configurable: true
+				}) === true;
+			}
+			return super.set(target, key, value, receiver);
+		}
+
+		definePropertyDesc(target, prop, desc) {
+			// Note: target@this(unsafe) prop@prim desc@this(safe) throws@this(unsafe)
+			if (desc && (desc.set || desc.get || typeof desc.value === 'function')) return undefined;
+			return desc;
+		}
+
+	}
+
+	function protectedFactory(object) {
+		// Note: other@other(unsafe) returns@this(unsafe) throws@this(unsafe)
+		return new ProtectedHandler(object);
+	}
+
+	class ReadOnlyHandler extends BaseHandler {
+
+		getFactory() {
+			return readonlyFactory;
+		}
+
+		set(target, key, value, receiver) {
+			// Note: target@this(unsafe) key@prim value@this(unsafe) receiver@this(unsafe) throws@this(unsafe)
+			return thisReflectDefineProperty(receiver, key, {
+				__proto__: null,
+				value: value,
+				writable: true,
+				enumerable: true,
+				configurable: true
+			});
+		}
+
+		setPrototypeOf(target, value) {
+			// Note: target@this(unsafe) throws@this(unsafe)
+			return false;
+		}
+
+		defineProperty(target, prop, desc) {
+			// Note: target@this(unsafe) prop@prim desc@this(unsafe) throws@this(unsafe)
+			return false;
+		}
+
+		deleteProperty(target, prop) {
+			// Note: target@this(unsafe) prop@prim throws@this(unsafe)
+			return false;
+		}
+
+		isExtensible(target) {
+			// Note: target@this(unsafe) throws@this(unsafe)
+			return false;
+		}
+
+		preventExtensions(target) {
+			// Note: target@this(unsafe) throws@this(unsafe)
+			return false;
+		}
+
+	}
+
+	function readonlyFactory(object) {
+		// Note: other@other(unsafe) returns@this(unsafe) throws@this(unsafe)
+		return new ReadOnlyHandler(object);
+	}
+
+	class ReadOnlyMockHandler extends ReadOnlyHandler {
+
+		constructor(object, mock) {
+			// Note: object@other(unsafe) mock:this(unsafe) throws@this(unsafe)
+			super(object);
+			this.mock = mock;
+		}
+
+		get(target, key, receiver) {
+			// Note: target@this(unsafe) key@prim receiver@this(unsafe) throws@this(unsafe)
+			const object = this.getObject(); // @other(unsafe)
+			const mock = this.mock;
+			if (thisReflectApply(thisObjectHasOwnProperty, mock, key) && !thisOtherHasOwnProperty(object, key)) {
+				return mock[key];
+			}
+			return super.get(target, key, receiver);
+		}
+
+	}
+
+	function thisFromOther(other) {
+		// Note: other@other(unsafe) returns@this(unsafe) throws@this(unsafe)
+		return thisFromOtherWithFactory(defaultFactory, other);
+	}
+
+	function thisProxyOther(factory, other, proto) {
+		const target = thisCreateTargetObject(other, proto);
+		const handler = factory(other);
+		const proxy = new ThisProxy(target, handler);
+		try {
+			otherReflectApply(otherWeakMapSet, mappingThisToOther, [proxy, other]);
+			registerProxy(proxy, handler);
+		} catch (e) {
+			throw new VMError('Unexpected error');
+		}
+		if (!isHost) {
+			thisReflectApply(thisWeakMapSet, mappingOtherToThis, [other, proxy]);
+			return proxy;
+		}
+		const proxy2 = new ThisProxy(proxy, emptyForzenObject);
+		try {
+			otherReflectApply(otherWeakMapSet, mappingThisToOther, [proxy2, other]);
+			registerProxy(proxy2, handler);
+		} catch (e) {
+			throw new VMError('Unexpected error');
+		}
+		thisReflectApply(thisWeakMapSet, mappingOtherToThis, [other, proxy2]);
+		return proxy2;
+	}
+
+	function thisEnsureThis(other) {
+		const type = typeof other;
+		switch (type) {
+			case 'object':
+				if (other === null) {
+					return null;
+				}
+				// fallthrough
+			case 'function':
+				let proto = thisReflectGetPrototypeOf(other);
+				if (!proto) {
+					return other;
+				}
+				while (proto) {
+					const mapping = thisReflectApply(thisMapGet, protoMappings, [proto]);
+					if (mapping) {
+						const mapped = thisReflectApply(thisWeakMapGet, mappingOtherToThis, [other]);
+						if (mapped) return mapped;
+						return mapping(defaultFactory, other);
+					}
+					proto = thisReflectGetPrototypeOf(proto);
+				}
+				return other;
+			case 'undefined':
+			case 'string':
+			case 'number':
+			case 'boolean':
+			case 'symbol':
+			case 'bigint':
+				return other;
+
+			default: // new, unknown types can be dangerous
+				throw new VMError(`Unknown type '${type}'`);
+		}
+	}
+
+	function thisFromOtherForThrow(other) {
+		for (let loop = 0; loop < 10; loop++) {
+			const type = typeof other;
+			switch (type) {
+				case 'object':
+					if (other === null) {
+						return null;
+					}
+					// fallthrough
+				case 'function':
+					const mapped = thisReflectApply(thisWeakMapGet, mappingOtherToThis, [other]);
+					if (mapped) return mapped;
+					let proto;
+					try {
+						proto = otherReflectGetPrototypeOf(other);
+					} catch (e) { // @other(unsafe)
+						other = e;
+						break;
+					}
+					if (!proto) {
+						return thisProxyOther(defaultFactory, other, null);
+					}
+					for (;;) {
+						const mapping = thisReflectApply(thisMapGet, protoMappings, [proto]);
+						if (mapping) return mapping(defaultFactory, other);
+						try {
+							proto = otherReflectGetPrototypeOf(proto);
+						} catch (e) { // @other(unsafe)
+							other = e;
+							break;
+						}
+						if (!proto) return thisProxyOther(defaultFactory, other, thisObjectPrototype);
+					}
+					break;
+				case 'undefined':
+				case 'string':
+				case 'number':
+				case 'boolean':
+				case 'symbol':
+				case 'bigint':
+					return other;
+
+				default: // new, unknown types can be dangerous
+					throw new VMError(`Unknown type '${type}'`);
+			}
+		}
+		throw new VMError('Exception recursion depth');
+	}
+
+	function thisFromOtherWithFactory(factory, other, proto) {
+		const type = typeof other;
+		switch (type) {
+			case 'object':
+				if (other === null) {
+					return null;
+				}
+				// fallthrough
+			case 'function':
+				const mapped = thisReflectApply(thisWeakMapGet, mappingOtherToThis, [other]);
+				if (mapped) return mapped;
+				if (proto) {
+					return thisProxyOther(factory, other, proto);
+				}
+				try {
+					proto = otherReflectGetPrototypeOf(other);
+				} catch (e) { // @other(unsafe)
+					throw thisFromOtherForThrow(e);
+				}
+				if (!proto) {
+					return thisProxyOther(factory, other, null);
+				}
+				do {
+					const mapping = thisReflectApply(thisMapGet, protoMappings, [proto]);
+					if (mapping) return mapping(factory, other);
+					try {
+						proto = otherReflectGetPrototypeOf(proto);
+					} catch (e) { // @other(unsafe)
+						throw thisFromOtherForThrow(e);
+					}
+				} while (proto);
+				return thisProxyOther(factory, other, thisObjectPrototype);
+			case 'undefined':
+			case 'string':
+			case 'number':
+			case 'boolean':
+			case 'symbol':
+			case 'bigint':
+				return other;
+
+			default: // new, unknown types can be dangerous
+				throw new VMError(`Unknown type '${type}'`);
+		}
+	}
+
+	function thisFromOtherArguments(args) {
+		// Note: args@other(safe-array) returns@this(safe-array) throws@this(unsafe)
+		const arr = [];
+		for (let i = 0; i < args.length; i++) {
+			const value = thisFromOther(args[i]);
+			thisReflectDefineProperty(arr, i, {
+				__proto__: null,
+				value: value,
+				writable: true,
+				enumerable: true,
+				configurable: true
+			});
+		}
+		return arr;
+	}
+
+	function thisConnect(obj, other) {
+		// Note: obj@this(unsafe) other@other(unsafe) throws@this(unsafe)
+		try {
+			otherReflectApply(otherWeakMapSet, mappingThisToOther, [obj, other]);
+		} catch (e) {
+			throw new VMError('Unexpected error');
+		}
+		thisReflectApply(thisWeakMapSet, mappingOtherToThis, [other, obj]);
+	}
+
+	thisAddProtoMapping(thisGlobalPrototypes.Object, otherGlobalPrototypes.Object);
+	thisAddProtoMapping(thisGlobalPrototypes.Array, otherGlobalPrototypes.Array);
+
+	for (let i = 0; i < globalsList.length; i++) {
+		const key = globalsList[i];
+		const tp = thisGlobalPrototypes[key];
+		const op = otherGlobalPrototypes[key];
+		if (tp && op) thisAddProtoMapping(tp, op, key);
+	}
+
+	for (let i = 0; i < errorsList.length; i++) {
+		const key = errorsList[i];
+		const tp = thisGlobalPrototypes[key];
+		const op = otherGlobalPrototypes[key];
+		if (tp && op) thisAddProtoMapping(tp, op, 'Error');
+	}
+
+	thisAddProtoMapping(thisGlobalPrototypes.VMError, otherGlobalPrototypes.VMError, 'Error');
+
+	result.BaseHandler = BaseHandler;
+	result.ProtectedHandler = ProtectedHandler;
+	result.ReadOnlyHandler = ReadOnlyHandler;
+	result.ReadOnlyMockHandler = ReadOnlyMockHandler;
+
+	return result;
+}
+
+exports.createBridge = createBridge;
+exports.VMError = VMError;

dist/save-only/events.js

@@ -0,0 +1,977 @@
+// Copyright Joyent, Inc. and other Node contributors.
+//
+// Permission is hereby granted, free of charge, to any person obtaining a
+// copy of this software and associated documentation files (the
+// "Software"), to deal in the Software without restriction, including
+// without limitation the rights to use, copy, modify, merge, publish,
+// distribute, sublicense, and/or sell copies of the Software, and to permit
+// persons to whom the Software is furnished to do so, subject to the
+// following conditions:
+//
+// The above copyright notice and this permission notice shall be included
+// in all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
+// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
+// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
+// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
+// USE OR OTHER DEALINGS IN THE SOFTWARE.
+
+// Modified by the vm2 team to make this a standalone module to be loaded into the sandbox.
+
+'use strict';
+
+const host = fromhost;
+
+const {
+	Boolean,
+  Error,
+	String,
+	Symbol
+} = globalThis;
+
+const ReflectApply = Reflect.apply;
+const ReflectOwnKeys = Reflect.ownKeys;
+
+const ErrorCaptureStackTrace = Error.captureStackTrace;
+
+const NumberIsNaN = Number.isNaN;
+
+const ObjectCreate = Object.create;
+const ObjectDefineProperty = Object.defineProperty;
+const ObjectDefineProperties = Object.defineProperties;
+const ObjectGetPrototypeOf = Object.getPrototypeOf;
+
+const SymbolFor = Symbol.for;
+
+function uncurryThis(func) {
+	return (thiz, ...args) => ReflectApply(func, thiz, args);
+}
+
+const ArrayPrototypeIndexOf = uncurryThis(Array.prototype.indexOf);
+const ArrayPrototypeJoin = uncurryThis(Array.prototype.join);
+const ArrayPrototypeSlice = uncurryThis(Array.prototype.slice);
+const ArrayPrototypeSplice = uncurryThis(Array.prototype.splice);
+const ArrayPrototypeUnshift = uncurryThis(Array.prototype.unshift);
+
+const kRejection = SymbolFor('nodejs.rejection');
+
+function inspect(obj) {
+	return typeof obj === 'symbol' ? obj.toString() : `${obj}`;
+}
+
+function spliceOne(list, index) {
+	for (; index + 1 < list.length; index++)
+		list[index] = list[index + 1];
+	list.pop();
+}
+
+function assert(what, message) {
+	if (!what) throw new Error(message);
+}
+
+function E(key, msg, Base) {
+	return function NodeError(...args) {
+	  const error = new Base();
+	  const message = ReflectApply(msg, error, args);
+	  ObjectDefineProperties(error, {
+		message: {
+		  value: message,
+		  enumerable: false,
+		  writable: true,
+		  configurable: true,
+		},
+		toString: {
+		  value() {
+			return `${this.name} [${key}]: ${this.message}`;
+		  },
+		  enumerable: false,
+		  writable: true,
+		  configurable: true,
+		},
+	  });
+	  error.code = key;
+	  return error;
+	};
+}
+
+
+const ERR_INVALID_ARG_TYPE = E('ERR_INVALID_ARG_TYPE',
+  (name, expected, actual) => {
+    assert(typeof name === 'string', "'name' must be a string");
+    if (!ArrayIsArray(expected)) {
+      expected = [expected];
+    }
+
+    let msg = 'The ';
+    if (StringPrototypeEndsWith(name, ' argument')) {
+      // For cases like 'first argument'
+      msg += `${name} `;
+    } else {
+      const type = StringPrototypeIncludes(name, '.') ? 'property' : 'argument';
+      msg += `"${name}" ${type} `;
+    }
+    msg += 'must be ';
+
+    const types = [];
+    const instances = [];
+    const other = [];
+
+    for (const value of expected) {
+      assert(typeof value === 'string',
+             'All expected entries have to be of type string');
+      if (ArrayPrototypeIncludes(kTypes, value)) {
+        ArrayPrototypePush(types, StringPrototypeToLowerCase(value));
+      } else if (RegExpPrototypeTest(classRegExp, value)) {
+        ArrayPrototypePush(instances, value);
+      } else {
+        assert(value !== 'object',
+               'The value "object" should be written as "Object"');
+        ArrayPrototypePush(other, value);
+      }
+    }
+
+    // Special handle `object` in case other instances are allowed to outline
+    // the differences between each other.
+    if (instances.length > 0) {
+      const pos = ArrayPrototypeIndexOf(types, 'object');
+      if (pos !== -1) {
+        ArrayPrototypeSplice(types, pos, 1);
+        ArrayPrototypePush(instances, 'Object');
+      }
+    }
+
+    if (types.length > 0) {
+      if (types.length > 2) {
+        const last = ArrayPrototypePop(types);
+        msg += `one of type ${ArrayPrototypeJoin(types, ', ')}, or ${last}`;
+      } else if (types.length === 2) {
+        msg += `one of type ${types[0]} or ${types[1]}`;
+      } else {
+        msg += `of type ${types[0]}`;
+      }
+      if (instances.length > 0 || other.length > 0)
+        msg += ' or ';
+    }
+
+    if (instances.length > 0) {
+      if (instances.length > 2) {
+        const last = ArrayPrototypePop(instances);
+        msg +=
+          `an instance of ${ArrayPrototypeJoin(instances, ', ')}, or ${last}`;
+      } else {
+        msg += `an instance of ${instances[0]}`;
+        if (instances.length === 2) {
+          msg += ` or ${instances[1]}`;
+        }
+      }
+      if (other.length > 0)
+        msg += ' or ';
+    }
+
+    if (other.length > 0) {
+      if (other.length > 2) {
+        const last = ArrayPrototypePop(other);
+        msg += `one of ${ArrayPrototypeJoin(other, ', ')}, or ${last}`;
+      } else if (other.length === 2) {
+        msg += `one of ${other[0]} or ${other[1]}`;
+      } else {
+        if (StringPrototypeToLowerCase(other[0]) !== other[0])
+          msg += 'an ';
+        msg += `${other[0]}`;
+      }
+    }
+
+    if (actual == null) {
+      msg += `. Received ${actual}`;
+    } else if (typeof actual === 'function' && actual.name) {
+      msg += `. Received function ${actual.name}`;
+    } else if (typeof actual === 'object') {
+      if (actual.constructor && actual.constructor.name) {
+        msg += `. Received an instance of ${actual.constructor.name}`;
+      } else {
+        const inspected = inspect(actual, { depth: -1 });
+        msg += `. Received ${inspected}`;
+      }
+    } else {
+      let inspected = inspect(actual, { colors: false });
+      if (inspected.length > 25)
+        inspected = `${StringPrototypeSlice(inspected, 0, 25)}...`;
+      msg += `. Received type ${typeof actual} (${inspected})`;
+    }
+    return msg;
+  }, TypeError);
+
+const ERR_INVALID_THIS = E('ERR_INVALID_THIS', s => `Value of "this" must be of type ${s}`, TypeError);
+
+const ERR_OUT_OF_RANGE = E('ERR_OUT_OF_RANGE',
+  (str, range, input, replaceDefaultBoolean = false) => {
+    assert(range, 'Missing "range" argument');
+    let msg = replaceDefaultBoolean ? str :
+      `The value of "${str}" is out of range.`;
+    const received = inspect(input);
+    msg += ` It must be ${range}. Received ${received}`;
+    return msg;
+  }, RangeError);
+
+const ERR_UNHANDLED_ERROR = E('ERR_UNHANDLED_ERROR',
+  err => {
+    const msg = 'Unhandled error.';
+    if (err === undefined) return msg;
+    return `${msg} (${err})`;
+  }, Error);
+
+function validateBoolean(value, name) {
+  if (typeof value !== 'boolean')
+    throw new ERR_INVALID_ARG_TYPE(name, 'boolean', value);
+}
+
+function validateFunction(value, name) {
+  if (typeof value !== 'function')
+    throw new ERR_INVALID_ARG_TYPE(name, 'Function', value);
+}
+
+function validateString(value, name) {
+  if (typeof value !== 'string')
+    throw new ERR_INVALID_ARG_TYPE(name, 'string', value);
+}
+
+function nc(cond, e) {
+	return cond === undefined || cond === null ? e : cond;
+}
+
+function oc(base, key) {
+	return base === undefined || base === null ? undefined : base[key];
+}
+
+const kCapture = Symbol('kCapture');
+const kErrorMonitor = host.kErrorMonitor || Symbol('events.errorMonitor');
+const kMaxEventTargetListeners = Symbol('events.maxEventTargetListeners');
+const kMaxEventTargetListenersWarned =
+  Symbol('events.maxEventTargetListenersWarned');
+
+const kIsEventTarget = SymbolFor('nodejs.event_target');
+
+function isEventTarget(obj) {
+	return oc(oc(obj, 'constructor'), kIsEventTarget);
+}
+
+/**
+ * Creates a new `EventEmitter` instance.
+ * @param {{ captureRejections?: boolean; }} [opts]
+ * @constructs {EventEmitter}
+ */
+function EventEmitter(opts) {
+  EventEmitter.init.call(this, opts);
+}
+module.exports = EventEmitter;
+if (host.once) module.exports.once = host.once;
+if (host.on) module.exports.on = host.on;
+if (host.getEventListeners) module.exports.getEventListeners = host.getEventListeners;
+// Backwards-compat with node 0.10.x
+EventEmitter.EventEmitter = EventEmitter;
+
+EventEmitter.usingDomains = false;
+
+EventEmitter.captureRejectionSymbol = kRejection;
+ObjectDefineProperty(EventEmitter, 'captureRejections', {
+  get() {
+    return EventEmitter.prototype[kCapture];
+  },
+  set(value) {
+    validateBoolean(value, 'EventEmitter.captureRejections');
+
+    EventEmitter.prototype[kCapture] = value;
+  },
+  enumerable: true
+});
+
+if (host.EventEmitterReferencingAsyncResource) {
+	const kAsyncResource = Symbol('kAsyncResource');
+	const EventEmitterReferencingAsyncResource = host.EventEmitterReferencingAsyncResource;
+
+	class EventEmitterAsyncResource extends EventEmitter {
+		/**
+		 * @param {{
+		 *   name?: string,
+		 *   triggerAsyncId?: number,
+		 *   requireManualDestroy?: boolean,
+		 * }} [options]
+		 */
+		constructor(options = undefined) {
+			let name;
+			if (typeof options === 'string') {
+				name = options;
+				options = undefined;
+			} else {
+				if (new.target === EventEmitterAsyncResource) {
+					validateString(oc(options, 'name'), 'options.name');
+				}
+				name = oc(options, 'name') || new.target.name;
+			}
+			super(options);
+
+			this[kAsyncResource] =
+				new EventEmitterReferencingAsyncResource(this, name, options);
+		}
+
+		/**
+		 * @param {symbol,string} event
+		 * @param  {...any} args
+		 * @returns {boolean}
+		 */
+		emit(event, ...args) {
+			if (this[kAsyncResource] === undefined)
+				throw new ERR_INVALID_THIS('EventEmitterAsyncResource');
+			const { asyncResource } = this;
+			ArrayPrototypeUnshift(args, super.emit, this, event);
+			return ReflectApply(asyncResource.runInAsyncScope, asyncResource,
+													args);
+		}
+
+		/**
+		 * @returns {void}
+		 */
+		emitDestroy() {
+			if (this[kAsyncResource] === undefined)
+				throw new ERR_INVALID_THIS('EventEmitterAsyncResource');
+			this.asyncResource.emitDestroy();
+		}
+
+		/**
+		 * @type {number}
+		 */
+		get asyncId() {
+			if (this[kAsyncResource] === undefined)
+				throw new ERR_INVALID_THIS('EventEmitterAsyncResource');
+			return this.asyncResource.asyncId();
+		}
+
+		/**
+		 * @type {number}
+		 */
+		get triggerAsyncId() {
+			if (this[kAsyncResource] === undefined)
+				throw new ERR_INVALID_THIS('EventEmitterAsyncResource');
+			return this.asyncResource.triggerAsyncId();
+		}
+
+		/**
+		 * @type {EventEmitterReferencingAsyncResource}
+		 */
+		get asyncResource() {
+			if (this[kAsyncResource] === undefined)
+				throw new ERR_INVALID_THIS('EventEmitterAsyncResource');
+			return this[kAsyncResource];
+		}
+	}
+	EventEmitter.EventEmitterAsyncResource = EventEmitterAsyncResource;
+}
+
+EventEmitter.errorMonitor = kErrorMonitor;
+
+// The default for captureRejections is false
+ObjectDefineProperty(EventEmitter.prototype, kCapture, {
+  value: false,
+  writable: true,
+  enumerable: false
+});
+
+EventEmitter.prototype._events = undefined;
+EventEmitter.prototype._eventsCount = 0;
+EventEmitter.prototype._maxListeners = undefined;
+
+// By default EventEmitters will print a warning if more than 10 listeners are
+// added to it. This is a useful default which helps finding memory leaks.
+let defaultMaxListeners = 10;
+
+function checkListener(listener) {
+  validateFunction(listener, 'listener');
+}
+
+ObjectDefineProperty(EventEmitter, 'defaultMaxListeners', {
+  enumerable: true,
+  get: function() {
+    return defaultMaxListeners;
+  },
+  set: function(arg) {
+    if (typeof arg !== 'number' || arg < 0 || NumberIsNaN(arg)) {
+      throw new ERR_OUT_OF_RANGE('defaultMaxListeners',
+                                 'a non-negative number',
+                                 arg);
+    }
+    defaultMaxListeners = arg;
+  }
+});
+
+ObjectDefineProperties(EventEmitter, {
+  kMaxEventTargetListeners: {
+    value: kMaxEventTargetListeners,
+    enumerable: false,
+    configurable: false,
+    writable: false,
+  },
+  kMaxEventTargetListenersWarned: {
+    value: kMaxEventTargetListenersWarned,
+    enumerable: false,
+    configurable: false,
+    writable: false,
+  }
+});
+
+/**
+ * Sets the max listeners.
+ * @param {number} n
+ * @param {EventTarget[] | EventEmitter[]} [eventTargets]
+ * @returns {void}
+ */
+EventEmitter.setMaxListeners =
+  function(n = defaultMaxListeners, ...eventTargets) {
+    if (typeof n !== 'number' || n < 0 || NumberIsNaN(n))
+      throw new ERR_OUT_OF_RANGE('n', 'a non-negative number', n);
+    if (eventTargets.length === 0) {
+      defaultMaxListeners = n;
+    } else {
+      for (let i = 0; i < eventTargets.length; i++) {
+        const target = eventTargets[i];
+        if (isEventTarget(target)) {
+          target[kMaxEventTargetListeners] = n;
+          target[kMaxEventTargetListenersWarned] = false;
+        } else if (typeof target.setMaxListeners === 'function') {
+          target.setMaxListeners(n);
+        } else {
+          throw new ERR_INVALID_ARG_TYPE(
+            'eventTargets',
+            ['EventEmitter', 'EventTarget'],
+            target);
+        }
+      }
+    }
+  };
+
+// If you're updating this function definition, please also update any
+// re-definitions, such as the one in the Domain module (lib/domain.js).
+EventEmitter.init = function(opts) {
+
+  if (this._events === undefined ||
+      this._events === ObjectGetPrototypeOf(this)._events) {
+    this._events = ObjectCreate(null);
+    this._eventsCount = 0;
+  }
+
+  this._maxListeners = this._maxListeners || undefined;
+
+
+  if (oc(opts, 'captureRejections')) {
+    validateBoolean(opts.captureRejections, 'options.captureRejections');
+    this[kCapture] = Boolean(opts.captureRejections);
+  } else {
+    // Assigning the kCapture property directly saves an expensive
+    // prototype lookup in a very sensitive hot path.
+    this[kCapture] = EventEmitter.prototype[kCapture];
+  }
+};
+
+function addCatch(that, promise, type, args) {
+  if (!that[kCapture]) {
+    return;
+  }
+
+  // Handle Promises/A+ spec, then could be a getter
+  // that throws on second use.
+  try {
+    const then = promise.then;
+
+    if (typeof then === 'function') {
+      then.call(promise, undefined, function(err) {
+        // The callback is called with nextTick to avoid a follow-up
+        // rejection from this promise.
+        process.nextTick(emitUnhandledRejectionOrErr, that, err, type, args);
+      });
+    }
+  } catch (err) {
+    that.emit('error', err);
+  }
+}
+
+function emitUnhandledRejectionOrErr(ee, err, type, args) {
+  if (typeof ee[kRejection] === 'function') {
+    ee[kRejection](err, type, ...args);
+  } else {
+    // We have to disable the capture rejections mechanism, otherwise
+    // we might end up in an infinite loop.
+    const prev = ee[kCapture];
+
+    // If the error handler throws, it is not catchable and it
+    // will end up in 'uncaughtException'. We restore the previous
+    // value of kCapture in case the uncaughtException is present
+    // and the exception is handled.
+    try {
+      ee[kCapture] = false;
+      ee.emit('error', err);
+    } finally {
+      ee[kCapture] = prev;
+    }
+  }
+}
+
+/**
+ * Increases the max listeners of the event emitter.
+ * @param {number} n
+ * @returns {EventEmitter}
+ */
+EventEmitter.prototype.setMaxListeners = function setMaxListeners(n) {
+  if (typeof n !== 'number' || n < 0 || NumberIsNaN(n)) {
+    throw new ERR_OUT_OF_RANGE('n', 'a non-negative number', n);
+  }
+  this._maxListeners = n;
+  return this;
+};
+
+function _getMaxListeners(that) {
+  if (that._maxListeners === undefined)
+    return EventEmitter.defaultMaxListeners;
+  return that._maxListeners;
+}
+
+/**
+ * Returns the current max listener value for the event emitter.
+ * @returns {number}
+ */
+EventEmitter.prototype.getMaxListeners = function getMaxListeners() {
+  return _getMaxListeners(this);
+};
+
+/**
+ * Synchronously calls each of the listeners registered
+ * for the event.
+ * @param {string | symbol} type
+ * @param {...any} [args]
+ * @returns {boolean}
+ */
+EventEmitter.prototype.emit = function emit(type, ...args) {
+  let doError = (type === 'error');
+
+  const events = this._events;
+  if (events !== undefined) {
+    if (doError && events[kErrorMonitor] !== undefined)
+      this.emit(kErrorMonitor, ...args);
+    doError = (doError && events.error === undefined);
+  } else if (!doError)
+    return false;
+
+  // If there is no 'error' event listener then throw.
+  if (doError) {
+    let er;
+    if (args.length > 0)
+      er = args[0];
+    if (er instanceof Error) {
+      try {
+        const capture = {};
+        ErrorCaptureStackTrace(capture, EventEmitter.prototype.emit);
+      } catch (e) {}
+
+      // Note: The comments on the `throw` lines are intentional, they show
+      // up in Node's output if this results in an unhandled exception.
+      throw er; // Unhandled 'error' event
+    }
+
+    let stringifiedEr;
+    try {
+      stringifiedEr = inspect(er);
+    } catch (e) {
+      stringifiedEr = er;
+    }
+
+    // At least give some kind of context to the user
+    const err = new ERR_UNHANDLED_ERROR(stringifiedEr);
+    err.context = er;
+    throw err; // Unhandled 'error' event
+  }
+
+  const handler = events[type];
+
+  if (handler === undefined)
+    return false;
+
+  if (typeof handler === 'function') {
+    const result = handler.apply(this, args);
+
+    // We check if result is undefined first because that
+    // is the most common case so we do not pay any perf
+    // penalty
+    if (result !== undefined && result !== null) {
+      addCatch(this, result, type, args);
+    }
+  } else {
+    const len = handler.length;
+    const listeners = arrayClone(handler);
+    for (let i = 0; i < len; ++i) {
+      const result = listeners[i].apply(this, args);
+
+      // We check if result is undefined first because that
+      // is the most common case so we do not pay any perf
+      // penalty.
+      // This code is duplicated because extracting it away
+      // would make it non-inlineable.
+      if (result !== undefined && result !== null) {
+        addCatch(this, result, type, args);
+      }
+    }
+  }
+
+  return true;
+};
+
+function _addListener(target, type, listener, prepend) {
+  let m;
+  let events;
+  let existing;
+
+  checkListener(listener);
+
+  events = target._events;
+  if (events === undefined) {
+    events = target._events = ObjectCreate(null);
+    target._eventsCount = 0;
+  } else {
+    // To avoid recursion in the case that type === "newListener"! Before
+    // adding it to the listeners, first emit "newListener".
+    if (events.newListener !== undefined) {
+      target.emit('newListener', type,
+                  nc(listener.listener, listener));
+
+      // Re-assign `events` because a newListener handler could have caused the
+      // this._events to be assigned to a new object
+      events = target._events;
+    }
+    existing = events[type];
+  }
+
+  if (existing === undefined) {
+    // Optimize the case of one listener. Don't need the extra array object.
+    events[type] = listener;
+    ++target._eventsCount;
+  } else {
+    if (typeof existing === 'function') {
+      // Adding the second element, need to change to array.
+      existing = events[type] =
+        prepend ? [listener, existing] : [existing, listener];
+      // If we've already got an array, just append.
+    } else if (prepend) {
+      existing.unshift(listener);
+    } else {
+      existing.push(listener);
+    }
+
+    // Check for listener leak
+    m = _getMaxListeners(target);
+    if (m > 0 && existing.length > m && !existing.warned) {
+      existing.warned = true;
+      // No error code for this since it is a Warning
+      // eslint-disable-next-line no-restricted-syntax
+      const w = new Error('Possible EventEmitter memory leak detected. ' +
+                          `${existing.length} ${String(type)} listeners ` +
+                          `added to ${inspect(target, { depth: -1 })}. Use ` +
+                          'emitter.setMaxListeners() to increase limit');
+      w.name = 'MaxListenersExceededWarning';
+      w.emitter = target;
+      w.type = type;
+      w.count = existing.length;
+      process.emitWarning(w);
+    }
+  }
+
+  return target;
+}
+
+/**
+ * Adds a listener to the event emitter.
+ * @param {string | symbol} type
+ * @param {Function} listener
+ * @returns {EventEmitter}
+ */
+EventEmitter.prototype.addListener = function addListener(type, listener) {
+  return _addListener(this, type, listener, false);
+};
+
+EventEmitter.prototype.on = EventEmitter.prototype.addListener;
+
+/**
+ * Adds the `listener` function to the beginning of
+ * the listeners array.
+ * @param {string | symbol} type
+ * @param {Function} listener
+ * @returns {EventEmitter}
+ */
+EventEmitter.prototype.prependListener =
+    function prependListener(type, listener) {
+      return _addListener(this, type, listener, true);
+    };
+
+function onceWrapper() {
+  if (!this.fired) {
+    this.target.removeListener(this.type, this.wrapFn);
+    this.fired = true;
+    if (arguments.length === 0)
+      return this.listener.call(this.target);
+    return this.listener.apply(this.target, arguments);
+  }
+}
+
+function _onceWrap(target, type, listener) {
+  const state = { fired: false, wrapFn: undefined, target, type, listener };
+  const wrapped = onceWrapper.bind(state);
+  wrapped.listener = listener;
+  state.wrapFn = wrapped;
+  return wrapped;
+}
+
+/**
+ * Adds a one-time `listener` function to the event emitter.
+ * @param {string | symbol} type
+ * @param {Function} listener
+ * @returns {EventEmitter}
+ */
+EventEmitter.prototype.once = function once(type, listener) {
+  checkListener(listener);
+
+  this.on(type, _onceWrap(this, type, listener));
+  return this;
+};
+
+/**
+ * Adds a one-time `listener` function to the beginning of
+ * the listeners array.
+ * @param {string | symbol} type
+ * @param {Function} listener
+ * @returns {EventEmitter}
+ */
+EventEmitter.prototype.prependOnceListener =
+    function prependOnceListener(type, listener) {
+      checkListener(listener);
+
+      this.prependListener(type, _onceWrap(this, type, listener));
+      return this;
+    };
+
+
+/**
+ * Removes the specified `listener` from the listeners array.
+ * @param {string | symbol} type
+ * @param {Function} listener
+ * @returns {EventEmitter}
+ */
+EventEmitter.prototype.removeListener =
+    function removeListener(type, listener) {
+      checkListener(listener);
+
+      const events = this._events;
+      if (events === undefined)
+        return this;
+
+      const list = events[type];
+      if (list === undefined)
+        return this;
+
+      if (list === listener || list.listener === listener) {
+        if (--this._eventsCount === 0)
+          this._events = ObjectCreate(null);
+        else {
+          delete events[type];
+          if (events.removeListener)
+            this.emit('removeListener', type, list.listener || listener);
+        }
+      } else if (typeof list !== 'function') {
+        let position = -1;
+
+        for (let i = list.length - 1; i >= 0; i--) {
+          if (list[i] === listener || list[i].listener === listener) {
+            position = i;
+            break;
+          }
+        }
+
+        if (position < 0)
+          return this;
+
+        if (position === 0)
+          list.shift();
+        else {
+          spliceOne(list, position);
+        }
+
+        if (list.length === 1)
+          events[type] = list[0];
+
+        if (events.removeListener !== undefined)
+          this.emit('removeListener', type, listener);
+      }
+
+      return this;
+    };
+
+EventEmitter.prototype.off = EventEmitter.prototype.removeListener;
+
+/**
+ * Removes all listeners from the event emitter. (Only
+ * removes listeners for a specific event name if specified
+ * as `type`).
+ * @param {string | symbol} [type]
+ * @returns {EventEmitter}
+ */
+EventEmitter.prototype.removeAllListeners =
+    function removeAllListeners(type) {
+      const events = this._events;
+      if (events === undefined)
+        return this;
+
+      // Not listening for removeListener, no need to emit
+      if (events.removeListener === undefined) {
+        if (arguments.length === 0) {
+          this._events = ObjectCreate(null);
+          this._eventsCount = 0;
+        } else if (events[type] !== undefined) {
+          if (--this._eventsCount === 0)
+            this._events = ObjectCreate(null);
+          else
+            delete events[type];
+        }
+        return this;
+      }
+
+      // Emit removeListener for all listeners on all events
+      if (arguments.length === 0) {
+        for (const key of ReflectOwnKeys(events)) {
+          if (key === 'removeListener') continue;
+          this.removeAllListeners(key);
+        }
+        this.removeAllListeners('removeListener');
+        this._events = ObjectCreate(null);
+        this._eventsCount = 0;
+        return this;
+      }
+
+      const listeners = events[type];
+
+      if (typeof listeners === 'function') {
+        this.removeListener(type, listeners);
+      } else if (listeners !== undefined) {
+        // LIFO order
+        for (let i = listeners.length - 1; i >= 0; i--) {
+          this.removeListener(type, listeners[i]);
+        }
+      }
+
+      return this;
+    };
+
+function _listeners(target, type, unwrap) {
+  const events = target._events;
+
+  if (events === undefined)
+    return [];
+
+  const evlistener = events[type];
+  if (evlistener === undefined)
+    return [];
+
+  if (typeof evlistener === 'function')
+    return unwrap ? [evlistener.listener || evlistener] : [evlistener];
+
+  return unwrap ?
+    unwrapListeners(evlistener) : arrayClone(evlistener);
+}
+
+/**
+ * Returns a copy of the array of listeners for the event name
+ * specified as `type`.
+ * @param {string | symbol} type
+ * @returns {Function[]}
+ */
+EventEmitter.prototype.listeners = function listeners(type) {
+  return _listeners(this, type, true);
+};
+
+/**
+ * Returns a copy of the array of listeners and wrappers for
+ * the event name specified as `type`.
+ * @param {string | symbol} type
+ * @returns {Function[]}
+ */
+EventEmitter.prototype.rawListeners = function rawListeners(type) {
+  return _listeners(this, type, false);
+};
+
+/**
+ * Returns the number of listeners listening to the event name
+ * specified as `type`.
+ * @deprecated since v3.2.0
+ * @param {EventEmitter} emitter
+ * @param {string | symbol} type
+ * @returns {number}
+ */
+EventEmitter.listenerCount = function(emitter, type) {
+  if (typeof emitter.listenerCount === 'function') {
+    return emitter.listenerCount(type);
+  }
+  return emitter.listenerCount(type);
+};
+
+EventEmitter.prototype.listenerCount = listenerCount;
+
+/**
+ * Returns the number of listeners listening to event name
+ * specified as `type`.
+ * @param {string | symbol} type
+ * @returns {number}
+ */
+function listenerCount(type) {
+  const events = this._events;
+
+  if (events !== undefined) {
+    const evlistener = events[type];
+
+    if (typeof evlistener === 'function') {
+      return 1;
+    } else if (evlistener !== undefined) {
+      return evlistener.length;
+    }
+  }
+
+  return 0;
+}
+
+/**
+ * Returns an array listing the events for which
+ * the emitter has registered listeners.
+ * @returns {any[]}
+ */
+EventEmitter.prototype.eventNames = function eventNames() {
+  return this._eventsCount > 0 ? ReflectOwnKeys(this._events) : [];
+};
+
+function arrayClone(arr) {
+  // At least since V8 8.3, this implementation is faster than the previous
+  // which always used a simple for-loop
+  switch (arr.length) {
+    case 2: return [arr[0], arr[1]];
+    case 3: return [arr[0], arr[1], arr[2]];
+    case 4: return [arr[0], arr[1], arr[2], arr[3]];
+    case 5: return [arr[0], arr[1], arr[2], arr[3], arr[4]];
+    case 6: return [arr[0], arr[1], arr[2], arr[3], arr[4], arr[5]];
+  }
+  return ArrayPrototypeSlice(arr);
+}
+
+function unwrapListeners(arr) {
+  const ret = arrayClone(arr);
+  for (let i = 0; i < ret.length; ++i) {
+    const orig = ret[i].listener;
+    if (typeof orig === 'function')
+      ret[i] = orig;
+  }
+  return ret;
+}