Package Exports

weakmap-polyfill

This package does not declare an exports field, so the exports above have been automatically detected and optimized by JSPM instead. If any package subpath is missing, it is recommended to post an issue to the original package (weakmap-polyfill) to support the "exports" field. If that is not possible, create a JSPM override to customize the exports field for this package.

Readme

weakmap-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.

using `import`

import 'weakmap-polyfill';
const weakMap = new WeakMap();

using `require`

require('weakmap-polyfill');
var weakMap = new WeakMap();

browser (standalone)

<script src="weakmap-polyfill.min.js"></script>
<script>
var weakMap = new WeakMap();
</script>

Compatibility

Chrome 15
Firefox 3
IE 7
Safari 4
Opera 11.5
Edge

Browser Tests

Limitations

This polyfill has following few limitations.

WeakMap iterable argument 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