# WeakSet

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A polyfill for IE11 or browsers that have a WeakMap, but not a [WeakSet](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/WeakSet).

  * CDN via https://unpkg.com/@ungap/weakset
  * ESM via `import WeakSet from '@ungap/weakset'`
  * CJS via `const WeakSet = require('@ungap/weakset')`

Compatible down to IE9, works well with ES5 shim upfront in IE8 (and maybe lower too).

[Live test](https://ungap.github.io/weakset/test/)