krakenjs/cross-domain-safe-weakmap

Cross-domain safe WeakMap shim

Cross Domain Safe WeakMap

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.

cross-domain-safe-weakmap's Issues

Flow error

Hello,

I'm getting the flow error on cross-domain-safe-weakmap/dist/module/index.js.flow:20
Using [email protected]

Unexpected token :

     17│   set(key: K, value: V): void | void | void | void;
     18│ }
     19│
     20│ declare export default {WeakMap: WeakMap<K: Object, V>};
     21│