npmpackage.info

is-weakmap

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

2.0.2

MIT

JavaScript

305.00 B

1,554,032,537 4.6

Installations

npm install is-weakmap

Developer Guide

BETA

Typescript

Yes

Module System

CommonJS

Min. Node Version

>= 0.4

Node Version

21.7.0

NPM Version

10.5.0 Pull Requests

Open

0

Total

5

Closed

0

Merged

5

Issues

Open

1

Total

4

Closed

3

Releases

Unable to fetch releases

Contributors

Unable to fetch Contributors

View all 1 contributors

Languages

JavaScript

JavaScript (100%)

Developer

inspect-js

Download Statistics

Total Downloads

1,554,032,537

Last Day

3,728,521

Last Week

22,368,147

Last Month

71,876,946

Last Year

855,606,780

GitHub Statistics

3 Stars

53 Commits

1 Forks

4 Watching

2 Branches

1 Contributors

Bundle Size

556.00 B

Minified

305.00 B

Minified + Gzipped

Bundlephobia

Sponsor this package

https://github.com/sponsors/ljharb

Maintainers

Package Meta Information

Latest Version

2.0.2

Package Id

is-weakmap@2.0.2

Unpacked Size

20.09 kB

Size

7.61 kB

File Count

NPM Version

10.5.0

Node Version

21.7.0

Publised On

08 Mar 2024

Total Downloads

Cumulative downloads

Total Downloads

1,554,032,537

Last day

-6.7%

3,728,521

Compared to previous day

Last week

3.9%

22,368,147

Compared to previous week

Last month

-22%

71,876,946

Compared to previous month

Last year

71.6%

855,606,780

Compared to previous year

Daily Downloads

Weekly Downloads

Monthly Downloads

Yearly Downloads

Dev Dependencies

@arethetypeswrong/cli @ljharb/eslint-config @types/for-each @types/object-inspect @types/tape aud auto-changelog core-js es5-shim es6-shim eslint for-each in-publish npmignore nyc object-inspect safe-publish-latest tape typescript

Versions

is-weakmap

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

Example

1var isWeakMap = require('is-weakmap');
2assert(!isWeakMap(function () {}));
3assert(!isWeakMap(null));
4assert(!isWeakMap(function* () { yield 42; return Infinity; });
5assert(!isWeakMap(Symbol('foo')));
6assert(!isWeakMap(1n));
7assert(!isWeakMap(Object(1n)));
8
9assert(!isWeakMap(new Set()));
10assert(!isWeakMap(new WeakSet()));
11assert(!isWeakMap(new Map()));
12
13assert(isWeakMap(new WeakMap()));
14
15class MyWeakMap extends WeakMap {}
16assert(isWeakMap(new MyWeakMap()));

Tests

Simply clone the repo, npm install, and run npm test

No vulnerabilities found.

10

Dangerous-Workflow

Determines if the project's GitHub Action workflows avoid dangerous patterns.

10

Binary-Artifacts

Determines if the project has generated executable (binary) artifacts in the source repository.

10

License

Determines if the project has defined a license.

10

Vulnerabilities

Determines if the project has open, known unfixed vulnerabilities.

9

Security-Policy

Determines if the project has published a security policy.

2

Maintained

Determines if the project is "actively maintained".

0

Code-Review

Determines if the project requires human code review before pull requests (aka merge requests) are merged.

0

Pinned-Dependencies

Determines if the project has declared and pinned the dependencies of its build process.

0

Token-Permissions

Determines if the project's workflows follow the principle of least privilege.

0

CII-Best-Practices

Determines if the project has an OpenSSF (formerly CII) Best Practices Badge.

0

Fuzzing

Determines if the project uses fuzzing.

0

SAST

Determines if the project uses static code analysis.

Score

4.6

/10

Last Scanned on 2025-01-13

The Open Source Security Foundation is a cross-industry collaboration to improve the security of open source software (OSS). The Scorecard provides security health metrics for open source projects.

Learn More

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Which kind of Collection (Map, Set, WeakMap, WeakSet) is this JavaScript value? Works cross-realm, without `instanceof`, and despite Symbol.toStringTag.

@zerodep/is-weakmap

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A utility to determine if a value is a WeakMap

is-weakmap-polyfill

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WeakMap Polyfill