is

npmv3.3.2

the definitive JavaScript type testing library

License MIT31 versions1 maintainers0 deps2,906,480 weekly dl
git://github.com/enricomarino/is
59
/ 100
Health
do not use

is has critical vulnerabilities — do not use

  • 1 critical vulnerabilities
Health breakdown0 – 100
10/25
maintenance
17/20
popularity
15/25
security
15/15
maturity
2/15
community
Vulnerabilities
1
1 critical
Advisories (1)
SeverityIDSummaryFixed in
criticalMAL-2025-6020Malicious code in is (npm)—

Bundle & TypeScript

🌟

TypeScript

7/10typed
Types from @types/is (DefinitelyTyped)

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First published · 2011-11-19T23:50:28.498Z

Last updated · 2025-07-19T19:13:33.146Z