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