JarCastingweakmap-polyfill
ECMAScript6 WeakMap polyfill.
Installation
npm
$ npm install --save weakmap-polyfill
Usage
Import or require weakmap-polyfill, then WeakMap will be defined in the global scope if native WeakMap is not supported in running environment.
node
require('weakmap-polyfill');
var weakMap = new WeakMap();
webpack etc.
import 'weakmap-polyfill';
const weakMap = new WeakMap();
browser (standalone)
<script src="weakmap-polyfill.min.js"></script>
<script>
var weakMap = new WeakMap();
</script>
Compatibility
This polyfill has following few limitations.
- WeakMap
iterableargument is not supported. (23.3.1.1 WeakMap ( [ iterable ] )) - Frozen and sealed objects are not supported.
- The values held by a WeakMap can't be collected once the map itself is GCed, since the values here are tied to the keys. #4
License
MIT