Cross Domain Safe WeakMap
![apache license](https://img.shields.io/npm/l/@krakenjs/cross-domain-safe-weakmap.svg?style=flat-square)
WeakMap shim that works with cross-domain windows. Uses native WeakMap when available.
Installation
As of version 2 this package will be published under the @krakenjs
scope.
npm install @krakenjs/cross-domain-safe-weakmap
Rationale
Storing references to window objects is memory-expensive, even after those window objects have closed.
Existing WeakMap shims hang an object of the WeakMap key. This poses a problem when dealing with cross-domain windows, where setting or getting any key other than a pre-defined set of readonly values, will throw a cross-origin error.