| 1 | # is-finalizationregistry <sup>[![Version Badge][npm-version-svg]][package-url]</sup>
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| 2 |
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| 3 | [![github actions][actions-image]][actions-url]
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| 4 | [![coverage][codecov-image]][codecov-url]
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| 5 | [![dependency status][deps-svg]][deps-url]
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| 6 | [![dev dependency status][dev-deps-svg]][dev-deps-url]
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| 7 | [![License][license-image]][license-url]
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| 8 | [![Downloads][downloads-image]][downloads-url]
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| 9 |
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| 10 | [![npm badge][npm-badge-png]][package-url]
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| 11 |
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| 12 | Is this value a JS FinalizationRegistry? This module works cross-realm/iframe, and despite ES6 @@toStringTag.
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| 13 |
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| 14 | ## Example
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| 15 |
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| 16 | ```js
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| 17 | var isFinalizationRegistry = require('is-finalizationregistry');
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| 18 | assert(!isFinalizationRegistry(function () {}));
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| 19 | assert(!isFinalizationRegistry(null));
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| 20 | assert(!isFinalizationRegistry(function* () { yield 42; return Infinity; });
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| 21 | assert(!isFinalizationRegistry(Symbol('foo')));
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| 22 | assert(!isFinalizationRegistry(1n));
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| 23 | assert(!isFinalizationRegistry(Object(1n)));
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| 24 |
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| 25 | assert(!isFinalizationRegistry(new Set()));
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| 26 | assert(!isFinalizationRegistry(new WeakSet()));
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| 27 | assert(!isFinalizationRegistry(new Map()));
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| 28 | assert(!isFinalizationRegistry(new WeakMap()));
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| 29 | assert(!isFinalizationRegistry(new WeakRef({})));
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| 30 |
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| 31 | assert(isFinalizationRegistry(new FinalizationRegistry(function () {})));
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| 32 |
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| 33 | class MyFinalizationRegistry extends FinalizationRegistry {}
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| 34 | assert(isFinalizationRegistry(new MyFinalizationRegistry(function () {})));
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| 35 | ```
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| 36 |
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| 37 | ## Tests
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| 38 | Simply clone the repo, `npm install`, and run `npm test`
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| 39 |
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| 40 | [package-url]: https://npmjs.org/package/is-finalizationregistry
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| 41 | [npm-version-svg]: https://versionbadg.es/inspect-js/is-finalizationregistry.svg
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| 42 | [deps-svg]: https://david-dm.org/inspect-js/is-finalizationregistry.svg
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| 43 | [deps-url]: https://david-dm.org/inspect-js/is-finalizationregistry
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| 44 | [dev-deps-svg]: https://david-dm.org/inspect-js/is-finalizationregistry/dev-status.svg
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| 45 | [dev-deps-url]: https://david-dm.org/inspect-js/is-finalizationregistry#info=devDependencies
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| 46 | [npm-badge-png]: https://nodei.co/npm/is-finalizationregistry.png?downloads=true&stars=true
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| 47 | [license-image]: https://img.shields.io/npm/l/is-finalizationregistry.svg
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| 48 | [license-url]: LICENSE
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| 49 | [downloads-image]: https://img.shields.io/npm/dm/is-finalizationregistry.svg
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| 50 | [downloads-url]: https://npm-stat.com/charts.html?package=is-finalizationregistry
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| 51 | [codecov-image]: https://codecov.io/gh/inspect-js/is-finalizationregistry/branch/main/graphs/badge.svg
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| 52 | [codecov-url]: https://app.codecov.io/gh/inspect-js/is-finalizationregistry/
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| 53 | [actions-image]: https://img.shields.io/endpoint?url=https://github-actions-badge-u3jn4tfpocch.runkit.sh/inspect-js/is-finalizationregistry
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| 54 | [actions-url]: https://github.com/inspect-js/is-finalizationregistry/actions
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