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is-weakmap (2.0.2)

Published 2026-02-24 13:58:43 +00:00 by atheaadmin

Installation

Setup this registry in your project .npmrc file:

registry=

To install the package using npm, run the following command:

npm install is-weakmap@2.0.2

or add it to the package.json file:

"is-weakmap": "2.0.2"

For more information on the npm registry, see the documentation.

About this package

is-weakmap

Is this value a JS WeakMap? This module works cross-realm/iframe, and despite ES6 @@toStringTag.

Example

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

Dependencies

Development Dependencies

ID	Version
@arethetypeswrong/cli	^0.15.0
@ljharb/eslint-config	^21.1.0
@types/for-each	^0.3.3
@types/object-inspect	^1.8.4
@types/tape	^5.6.4
aud	^2.0.4
auto-changelog	^2.4.0
core-js	^2.6.12
es5-shim	^4.6.7
es6-shim	^0.35.8
eslint	=8.8.0
for-each	^0.3.3
in-publish	^2.0.1
npmignore	^0.3.1
nyc	^10.3.2
object-inspect	^1.13.1
safe-publish-latest	^2.0.0
tape	^5.7.5
typescript	next

Keywords

map weakmap set weakset collection is robust

Details

npm

2026-02-24 13:58:43 +00:00

1

Jordan Harband

Project Site

MIT

latest

7.6 KiB

Assets (1)

is-weakmap-2.0.2.tgz 7.6 KiB

Versions (1) View all

2.0.2 2026-02-24