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4666 packages found
Check if a Buffer/Uint8Array is a GZIP file
An easy and powerful data validation code generator by JavaScript.
Check if a value is a regular expression
Test if a value is a function.
Test if a value is a plain object.
The definitive collection of is* functions for runtime type checking. Lodash-compatible, tree-shakable, with types.
Typesafety with strong inference
Test if a double-precision floating-point numeric value is infinite.
- stdlib
- stdmath
- assertion
- assert
- utilities
- utility
- utils
- util
- math
- mathematics
- ieee754
- floating-point
- float
- double
- View more
A tiny and fast dynamic type checker/enforcer library
Test if a value is a boolean.
Typesafety with strong inference
Test if a value is a number.
A small tool for validating arguments in JavaScript
A robust micro library for type checking. Defers to constructs' internal `[[Class]]` property rather than duck typing for excellent type detection and to avoid triggering false positives.
Check the immutability of TypeScript types
Type assertions aka less-broken `typeof`
simple script to check type
Verify if something is a Promise
Checks if variable has specific type. It can be used for primitives but its power lies in complex types like interfaces and in optional logic.