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52 lines
2.0 KiB
52 lines
2.0 KiB
# is-weakref <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][11]][1] |
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Is this value a JS WeakRef? 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 isWeakRef = require('is-weakref'); |
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assert(!isWeakRef(function () {})); |
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assert(!isWeakRef(null)); |
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assert(!isWeakRef(function* () { yield 42; return Infinity; }); |
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assert(!isWeakRef(Symbol('foo'))); |
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assert(!isWeakRef(1n)); |
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assert(!isWeakRef(Object(1n))); |
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assert(!isWeakRef(new Set())); |
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assert(!isWeakRef(new WeakSet())); |
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assert(!isWeakRef(new Map())); |
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assert(!isWeakRef(new WeakMap())); |
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assert(isWeakRef(new WeakRef({}))); |
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class MyWeakRef extends WeakRef {} |
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assert(isWeakRef(new MyWeakRef({}))); |
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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-weakref |
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[npm-version-svg]: https://versionbadg.es/inspect-js/is-weakref.svg |
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[deps-svg]: https://david-dm.org/inspect-js/is-weakref.svg |
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[deps-url]: https://david-dm.org/inspect-js/is-weakref |
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[dev-deps-svg]: https://david-dm.org/inspect-js/is-weakref/dev-status.svg |
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[dev-deps-url]: https://david-dm.org/inspect-js/is-weakref#info=devDependencies |
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[license-image]: https://img.shields.io/npm/l/is-weakref.svg |
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[license-url]: LICENSE |
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[downloads-image]: https://img.shields.io/npm/dm/is-weakref.svg |
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[downloads-url]: https://npm-stat.com/charts.html?package=is-weakref |
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[codecov-image]: https://codecov.io/gh/inspect-js/is-weakref/branch/main/graphs/badge.svg |
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[codecov-url]: https://app.codecov.io/gh/inspect-js/is-weakref/ |
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[actions-image]: https://img.shields.io/endpoint?url=https://github-actions-badge-u3jn4tfpocch.runkit.sh/inspect-js/is-weakref |
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[actions-url]: https://github.com/inspect-js/is-weakref/actions
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