Package

class-is

Enhances a JavaScript class by adding an is<Class> property to compare types between realms.

v1.1.0, 4 Apr 2018MITCommonJSTypes: None

$ npm install class-is

npm GitHub Homepage

Key numbers

As of 25 Sept 2026

Weekly downloads: 315.8k; -12% over 12 months
Gzip bundle size: -; No Bundlephobia data
Dependencies: 0; Direct, from package.json
Last release: 8 years ago; v1.1.0
GitHub stars: 17; 4 forks
Open issues / PRs: 3 / 1
Contributors: -
Commits, last 52 weeks: 0

Downloads

Last week 2026-09-15 to 2026-09-21

Weekly npm downloads, one point per week, weeks starting 23 Sept 2025 to 15 Sept 2026. The y axis starts at zero.

315,775 downloads last week, 1,485,120 in the last month. The 12-month change of -12% compares the average of the last 4 weeks with the first 4 weeks of the series.

Maintenance

Releases, last 12 months: 09 in total
Latest version: 1.1.0, 4 Apr 20188 years ago
First published: 23 Mar 2018
Last push to GitHub: 24 Jun 20202,283 days before the snapshot
Repository archived: No
Open issues: 3
Open pull requests: 1
Commits, last 52 weeks: 0
Dependents on npm: -

Major versions

v1 first release 1.0.0, 30 Mar 2018
v0 first release 0.2.0, 23 Mar 2018

Recent releases

Version	Published
1.1.0	4 Apr 2018
1.0.0	30 Mar 2018
0.5.1	30 Mar 2018
0.5.0	28 Mar 2018
0.4.0	27 Mar 2018
0.3.1	23 Mar 2018
0.3.0	23 Mar 2018
0.2.1	23 Mar 2018
0.2.0	23 Mar 2018

Compatibility

Module format: CommonJSFrom package.json type, main and exports fields
TypeScript types: None
Node.js engine range: Not declared
Runtimes: -
Unpacked size (npm): 25 kB
Dependencies (0): None

Install

npm install class-is

CDN

jsDelivrhttps://cdn.jsdelivr.net/npm/class-is@1.1.0/
unpkghttps://unpkg.com/class-is@1.1.0/
esm.shhttps://esm.sh/class-is@1.1.0

Sources: npm registry, npm downloads API, GitHub API. Data fetched 25 Sept 2026.

Indexability: Not indexed (discovery only): no category.