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This module works cross-realm/iframe, and despite ES6 @@toStringTag.","maintainers":[{"name":"ljharb","email":"ljharb@gmail.com"}],"readme":"# is-weakset <sup>[![Version Badge][npm-version-svg]][package-url]</sup>\n\n[![github actions][actions-image]][actions-url]\n[![coverage][codecov-image]][codecov-url]\n[![License][license-image]][license-url]\n[![Downloads][downloads-image]][downloads-url]\n\n[![npm badge][npm-badge-png]][package-url]\n\nIs this value a JS WeakSet? This module works cross-realm/iframe, and despite ES6 @@toStringTag.\n\n## Example\n\n```js\nvar isWeakSet = require('is-weakset');\nassert(!isWeakSet(function () {}));\nassert(!isWeakSet(null));\nassert(!isWeakSet(function* () { yield 42; return Infinity; });\nassert(!isWeakSet(Symbol('foo')));\nassert(!isWeakSet(1n));\nassert(!isWeakSet(Object(1n)));\n\nassert(!isWeakSet(new Set()));\nassert(!isWeakSet(new WeakMap()));\nassert(!isWeakSet(new Map()));\n\nassert(isWeakSet(new WeakSet()));\n\nclass MyWeakSet extends WeakSet {}\nassert(isWeakSet(new MyWeakSet()));\n```\n\n## Tests\nSimply clone the repo, `npm install`, and run `npm test`\n\n[package-url]: https://npmjs.org/package/is-weakset\n[npm-version-svg]: https://versionbadg.es/inspect-js/is-weakset.svg\n[deps-svg]: https://david-dm.org/inspect-js/is-weakset.svg\n[deps-url]: https://david-dm.org/inspect-js/is-weakset\n[dev-deps-svg]: https://david-dm.org/inspect-js/is-weakset/dev-status.svg\n[dev-deps-url]: https://david-dm.org/inspect-js/is-weakset#info=devDependencies\n[npm-badge-png]: https://nodei.co/npm/is-weakset.png?downloads=true&stars=true\n[license-image]: https://img.shields.io/npm/l/is-weakset.svg\n[license-url]: LICENSE\n[downloads-image]: https://img.shields.io/npm/dm/is-weakset.svg\n[downloads-url]: https://npm-stat.com/charts.html?package=is-weakset\n[codecov-image]: https://codecov.io/gh/inspect-js/is-weakset/branch/main/graphs/badge.svg\n[codecov-url]: https://app.codecov.io/gh/inspect-js/is-weakset/\n[actions-image]: https://img.shields.io/endpoint?url=https://github-actions-badge-u3jn4tfpocch.runkit.sh/inspect-js/is-weakset\n[actions-url]: https://github.com/inspect-js/is-weakset/actions\n","readmeFilename":"README.md"}