https://github.com/inspect-js/is-weakmap
Is this value a JS WeakMap? This module works cross-realm/iframe, and despite ES6 @@toStringTag.
https://github.com/inspect-js/is-weakmap
ecmascript is javascript map set weakmap weakset
Last synced: 3 months ago
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Is this value a JS WeakMap? This module works cross-realm/iframe, and despite ES6 @@toStringTag.
- Host: GitHub
- URL: https://github.com/inspect-js/is-weakmap
- Owner: inspect-js
- License: mit
- Created: 2019-11-11T23:03:54.000Z (over 5 years ago)
- Default Branch: main
- Last Pushed: 2024-11-12T17:22:44.000Z (7 months ago)
- Last Synced: 2025-03-31T16:36:39.292Z (3 months ago)
- Topics: ecmascript, is, javascript, map, set, weakmap, weakset
- Language: JavaScript
- Homepage:
- Size: 75.2 KB
- Stars: 3
- Watchers: 3
- Forks: 1
- Open Issues: 1
-
Metadata Files:
- Readme: README.md
- Changelog: CHANGELOG.md
- Funding: .github/FUNDING.yml
- License: LICENSE
Awesome Lists containing this project
README
# is-weakmap [![Version Badge][npm-version-svg]][package-url]
[![github actions][actions-image]][actions-url]
[![coverage][codecov-image]][codecov-url]
[![License][license-image]][license-url]
[![Downloads][downloads-image]][downloads-url]
[![npm badge][npm-badge-png]][package-url]
Is this value a JS WeakMap? This module works cross-realm/iframe, and despite ES6 @@toStringTag.
## Example
```js
var isWeakMap = require('is-weakmap');
assert(!isWeakMap(function () {}));
assert(!isWeakMap(null));
assert(!isWeakMap(function* () { yield 42; return Infinity; });
assert(!isWeakMap(Symbol('foo')));
assert(!isWeakMap(1n));
assert(!isWeakMap(Object(1n)));
assert(!isWeakMap(new Set()));
assert(!isWeakMap(new WeakSet()));
assert(!isWeakMap(new Map()));
assert(isWeakMap(new WeakMap()));
class MyWeakMap extends WeakMap {}
assert(isWeakMap(new MyWeakMap()));
```
## Tests
Simply clone the repo, `npm install`, and run `npm test`
[package-url]: https://npmjs.org/package/is-weakmap
[npm-version-svg]: https://versionbadg.es/inspect-js/is-weakmap.svg
[deps-svg]: https://david-dm.org/inspect-js/is-weakmap.svg
[deps-url]: https://david-dm.org/inspect-js/is-weakmap
[dev-deps-svg]: https://david-dm.org/inspect-js/is-weakmap/dev-status.svg
[dev-deps-url]: https://david-dm.org/inspect-js/is-weakmap#info=devDependencies
[npm-badge-png]: https://nodei.co/npm/is-weakmap.png?downloads=true&stars=true
[license-image]: https://img.shields.io/npm/l/is-weakmap.svg
[license-url]: LICENSE
[downloads-image]: https://img.shields.io/npm/dm/is-weakmap.svg
[downloads-url]: https://npm-stat.com/charts.html?package=is-weakmap
[codecov-image]: https://codecov.io/gh/inspect-js/is-weakmap/branch/main/graphs/badge.svg
[codecov-url]: https://app.codecov.io/gh/inspect-js/is-weakmap/
[actions-image]: https://img.shields.io/endpoint?url=https://github-actions-badge-u3jn4tfpocch.runkit.sh/inspect-js/is-weakmap
[actions-url]: https://github.com/inspect-js/is-weakmap/actions