'use strict';

const copyProps = (unsafe, safe) => {

for (const key of [...Object.getOwnPropertyNames(unsafe),

...Object.getOwnPropertySymbols(unsafe)

]) {

if (!Object.getOwnPropertyDescriptor(safe, key)) {

Object.defineProperty(

safe,

key,

Object.getOwnPropertyDescriptor(unsafe, key));

}

}

};

const makeSafe = (unsafe, safe) => {

copyProps(unsafe.prototype, safe.prototype);

copyProps(unsafe, safe);

Object.setPrototypeOf(safe.prototype, null);

Object.freeze(safe.prototype);

Object.freeze(safe);

return safe;

};

exports.SafeMap = makeSafe(Map, class SafeMap extends Map {});

exports.SafeSet = makeSafe(Set, class SafeSet extends Set {});

exports.SafePromise = makeSafe(Promise, class SafePromise extends Promise {});