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This module works cross-realm/iframe, and despite ES6 @@toStringTag.\n\n## Example\n\n```js\nvar isSet = require('is-set');\nassert(!isSet(function () {}));\nassert(!isSet(null));\nassert(!isSet(function* () { yield 42; return Infinity; });\nassert(!isSet(Symbol('foo')));\nassert(!isSet(1n));\nassert(!isSet(Object(1n)));\n\nassert(!isSet(new Map()));\nassert(!isSet(new WeakSet()));\nassert(!isSet(new WeakMap()));\n\nassert(isSet(new Set()));\n\nclass MySet extends Set {}\nassert(isSet(new MySet()));\n```\n\n## Tests\nSimply clone the repo, `npm install`, and run `npm test`\n\n[package-url]: https://npmjs.org/package/is-set\n[npm-version-svg]: https://versionbadg.es/inspect-js/is-set.svg\n[deps-svg]: https://david-dm.org/inspect-js/is-set.svg\n[deps-url]: https://david-dm.org/inspect-js/is-set\n[dev-deps-svg]: https://david-dm.org/inspect-js/is-set/dev-status.svg\n[dev-deps-url]: https://david-dm.org/inspect-js/is-set#info=devDependencies\n[npm-badge-png]: https://nodei.co/npm/is-set.png?downloads=true&stars=true\n[license-image]: https://img.shields.io/npm/l/is-set.svg\n[license-url]: LICENSE\n[downloads-image]: https://img.shields.io/npm/dm/is-set.svg\n[downloads-url]: https://npm-stat.com/charts.html?package=is-set\n[codecov-image]: https://codecov.io/gh/inspect-js/is-set/branch/main/graphs/badge.svg\n[codecov-url]: https://app.codecov.io/gh/inspect-js/is-set/\n[actions-image]: https://img.shields.io/endpoint?url=https://github-actions-badge-u3jn4tfpocch.runkit.sh/inspect-js/is-set\n[actions-url]: https://github.com/inspect-js/is-set/actions\n","_attachments":{},"homepage":"https://github.com/inspect-js/is-set#readme","bugs":{"url":"https://github.com/inspect-js/is-set/issues"},"license":"MIT"}