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npm · #2047 most downloaded on npm
JS type check (TypeScript supported) functions like `isPlainObject() isArray()` etc. A simple & small integration.
Last release 12 months ago
22 Sep 2025
Release timing varies
gaps range from 2 weeks to 10 months
Some releases are documented
notes for 30 of the last 60 stable releases
Nothing withdrawn
no release was ever pulled
8 years old
78 releases · first in 2018
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One column per quarter.
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is-what is now fully TypeScript supported! It will let TypeScript know mid-way an if statement which type the variable is if you check it with is-what
is-what is now fully TypeScript supported! It will let TypeScript know mid-way an if statement which type the variable is if you check it with is-what. 🤯
Check the readme section on TypeScript.
isPrimitive to check if a payload is a JavaScript primitive or notisType to check that the given payload is of a given type (useful to check for classes!)Completely rewrote the Readme!
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isWhat now returns false when a number is NaN or a date is invalid!
isWhat now returns false when a number is NaN or a date is invalid!
I made this change because I could think of no use cases where you wouldn't want this behaviour.
Please update to v2.0.0!
Enjoy! 🏜
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isWhat is an easy and clean way to do type checking in JavaScript.
isWhat is an easy and clean way to do type checking in JavaScript.
I built this library because other solutions were either too complex or didn't do exactly what I wanted.
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