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