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