Installations

npm install which-builtin-type

Developer Guide

BETA

Typescript

Yes

Module System

CommonJS, ESM

Min. Node Version

>= 0.4

Node Version

23.4.0

NPM Version

10.9.2 Score

96.8

Supply Chain

88.4

Quality

77.9

Maintenance

100

Vulnerability

100

License

Pull Requests

Open

0

Total

1

Closed

0

Merged

1

Issues

Open

1

Total

1

Closed

0

Releases

Unable to fetch releases

Languages

1

JavaScript

JavaScript (100%)

Developer

inspect-js

Download Statistics

Total Downloads

1,093,170,065

Last Day

3,771,422

Last Week

23,593,604

Last Month

99,634,394

Last Year

825,078,094

GitHub Statistics

MIT License

3 Stars

71 Commits

1 Forks

4 Watchers

1 Branches

1 Contributors

Updated on Dec 13, 2024

Bundle Size

30.11 kB

Minified

7.83 kB

Minified + Gzipped

Bundlephobia

Sponsor this package

https://github.com/sponsors/ljharb

Maintainers

1

View All 1 Contributors

Package Meta Information

Latest Version

1.2.1

Package Id

which-builtin-type@1.2.1

Unpacked Size

29.34 kB

Size

9.16 kB

File Count

10

NPM Version

10.9.2

Node Version

23.4.0

Published on

Dec 13, 2024

Total Downloads

Cumulative downloads

Total Downloads

1,093,170,065

Last Day

14.3%

3,771,422

Compared to previous day

Last Week

9.2%

23,593,604

Compared to previous week

Last Month

-6.7%

99,634,394

Compared to previous month

Last Year

211.5%

825,078,094

Compared to previous year

Weekly Downloads

Monthly Downloads

Yearly Downloads

Dependencies

13

call-bound function.prototype.name has-tostringtag is-async-function is-date-object is-finalizationregistry is-generator-function is-regex is-weakref isarray which-boxed-primitive which-collection which-typed-array

Dev Dependencies

34

which-builtin-type

What is the type of this builtin JavaScript value? Works cross-realm, without instanceof, and can not be fooled by a constructor property.

Example

1var whichBuiltinType = require('which-builtin-type');
2var assert = require('assert');
3
4assert.equal(undefined, whichBuiltinType(undefined));
5assert.equal(null, whichBuiltinType(null));
6assert.equal('Boolean', whichBuiltinType(false));
7assert.equal('Boolean', whichBuiltinType(true));
8assert.equal('Array', whichBuiltinType([]));
9assert.equal('Object', whichBuiltinType({}));
10assert.equal('RegExp', whichBuiltinType(/a/g));
11assert.equal('RegExp', whichBuiltinType(new RegExp('a', 'g')));
12assert.equal('Date', whichBuiltinType(new Date()));
13assert.equal('Number', whichBuiltinType(42));
14assert.equal('Number', whichBuiltinType(NaN));
15assert.equal('Number', whichBuiltinType(Infinity));
16assert.equal('Number', whichBuiltinType(new Number(42)));
17assert.equal('String', whichBuiltinType('foo'));
18assert.equal('String', whichBuiltinType(Object('foo')));
19assert.equal('Function', whichBuiltinType(function () {}));
20assert.equal('GeneratorFunction', whichBuiltinType(function* () {}));
21assert.equal('Function', whichBuiltinType(x => x * x));
22assert.equal('Array', whichBuiltinType([]));
23assert.equal('Int8Array', whichBuiltinType(new Int8Array()));
24assert.equal('Uint8Array', whichBuiltinType(new Uint8Array()));
25assert.equal('Uint8ClampedArray', whichBuiltinType(new Uint8ClampedArray()));
26assert.equal('Int16Array', whichBuiltinType(new Int16Array()));
27assert.equal('Uint16Array', whichBuiltinType(new Uint16Array()));
28assert.equal('Int32Array', whichBuiltinType(new Int32Array()));
29assert.equal('Uint32Array', whichBuiltinType(new Uint32Array()));
30assert.equal('Float32Array', whichBuiltinType(new Float32Array()));
31assert.equal('Float64Array', whichBuiltinType(new Float64Array()));
32assert.equal('BigInt64Array', whichBuiltinType(new BigInt64Array()));
33assert.equal('BigUint64Array', whichBuiltinType(new BigUint64Array()));

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

Vulnerabilities

Determines if the project has open, known unfixed vulnerabilities.

10

License

Determines if the project has defined a license.

9

Security-Policy

Determines if the project has published a security policy.

0

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

SAST

Determines if the project uses static code analysis.

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.

Score

4.4

/10

Last Scanned on 2025-05-05

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.

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