is-what
npmv5.5.0JS type check (TypeScript supported) functions like `isPlainObject() isArray()` etc. A simple & small integration.
Safe to adopt
Yes — is-what scores well across adoption, maintenance, weight, supply chain, and licensing. No download data reported for this package yet. Last published 352 days ago. 7 releases in the last 2 years.
- ?Adoption: grade ?, Not reported by this registry.
No download data reported for this package yet.
- BMaintenance: grade B, Good.
Last published 352 days ago. 7 releases in the last 2 years.
- AWeight: grade A, Excellent.
Zero runtime dependencies, about 37 KB installed.
- BSupply chain: grade B, Good.
This package has a single maintainer (bus factor of 1).
- ALicense: grade A, Excellent.
MIT — permissive, with no copyleft found in the dependency tree.
Grades are computed deterministically from registry metadata collected by PackageGraph — downloads, dependents, publish dates, the resolved dependency tree, maintainer count, and declared licenses. No third-party scores are used.
Install cost
What you actually take on by adding is-what to a project.
Runtime packages this one declares itself.
Distinct packages in the full runtime tree, deduplicated the way a package manager would.
Unpacked size of this package plus its entire runtime tree.
Longest resolved dependency chain below this package.
Compatibility
- Node.js
- node >=18
- Module format
- ESM only
- TypeScript
- No bundled types
- Install scripts
- None
Quick start
A usage example from the is-what README.
// import functions you want to use like so:
import { isString, isDate, isPlainObject } from 'is-what'is-what vs the alternatives
Packages solving a similar problem in the npm ecosystem, compared on the signals that drive an adoption decision.
| Package | Weekly downloads | Dependents | License | Last release |
|---|---|---|---|---|
| is-whatthis page | 0 | 1 | MIT | 11 months ago |
| expect-type | 78.4M | 8 | Apache-2.0 | 1 day ago |
| type-fest | 337.8M | 6 | (MIT OR CC0-1.0) | 1 day ago |
| zod | 246.7M | 13 | MIT | 1 day ago |
| csstype | 142.8M | 2 | MIT | 1 day ago |
| eslint | 138.4M | 279 | MIT | 1 day ago |
Dependencies
Declared by is-what v5.5.0. Runtime dependencies are installed with the package; dev dependencies are not.
Dev (7)
Used by
Popular packages that depend on is-what.
Relationship graph
Dependencies (left) and dependents (right) of is-what.
Frequently installed together
Release history
7 releases in the last two years, typically about 3 days apart.
| Version | Published | Size | License |
|---|---|---|---|
| 5.5.0latest | 11 months ago | 37 KB | MIT |
| 5.4.0 | 1 year ago | 36 KB | MIT |
| 5.3.0 | 1 year ago | 35 KB | MIT |
| 5.2.1 | 1 year ago | 35 KB | MIT |
| 5.2.0 | 1 year ago | 35 KB | MIT |
| 5.1.1 | 1 year ago | 34 KB | MIT |
| 5.1.0 | 1 year ago | 33 KB | MIT |
| 5.0.2 | 2 years ago | 33 KB | MIT |
| 5.0.1 | 2 years ago | 33 KB | MIT |
| 5.0.0 | 2 years ago | 33 KB | MIT |
| 4.1.16 | 2 years ago | 44 KB | MIT |
| 4.1.15 | 3 years ago | 44 KB | MIT |
| 4.1.15-3 | 3 years ago | 44 KB | MIT |
| 4.1.15-2 | 3 years ago | 44 KB | MIT |
| 4.1.13 | 3 years ago | 44 KB | MIT |
Overview
is-what is an npm package that jS type check (TypeScript supported) functions like `isPlainObject() isArray()` etc. A simple & small integration. It has 1 known dependents in the graph. The latest version is 5.5.0, released under the MIT license.
Who should use it
Teams working in the npm ecosystem who need jS type check (TypeScript supported) functions like `isPlainObject() isArray()` etc. A simple & small integration and value a focused solution.
When not to use it
Consider an alternative if you need to have first-class TypeScript types out of the box, or if a more actively-maintained option better fits your npm stack.
Pros
- Clear open-source license (MIT).
Cons
- No bundled TypeScript types (may require a separate @types package).
Auto-generated from collected registry metadata. No external claims are inferred.
Maintainers
Funding
Frequently asked questions
Should I use is-what?
Yes — is-what scores well across adoption, maintenance, weight, supply chain, and licensing. No download data reported for this package yet. Last published 352 days ago. 7 releases in the last 2 years.
How do I install is-what?
Run `npm install is-what` to add is-what to your npm project.
What license is is-what released under?
is-what is distributed under the MIT license.
How popular is is-what?
npm does not publish download counts. Within PackageGraph's crawl, 1 known packages depend on is-what.
Is is-what still maintained?
The most recent release of is-what (v5.5.0) was published 11 months ago.
Does is-what run install scripts?
No. is-what does not define preinstall, install, or postinstall scripts, so installing it does not execute publisher-supplied code.