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