Type Packages

Type check values

ECMAScript “ToPrimitive” algorithm. Provides ES5 and ES2015 versions.

Infer the content-type of a request.

Check if something is a promise

Improved typeof detection for node.js and the browser.

Check if something is a generator function

Check if a string is SVG

Check if a value is a regular expression

unist utility to check if a node passes a test

Stringify an object/array like JSON.stringify just without all the double-quotes

Detect the archive type of a Buffer/Uint8Array

A little library for asserting types and values, with zero dependencies.

Check if a value is an Observable

Returns `true` if the value is a primitive.

Checks if the given value is a window object.

the definitive JavaScript type testing library

Isomorphic, functional type-checking for Javascript

Convert an object or array into a formatted string

Resolve an options object based on configuration.

Check if a Buffer/Uint8Array is a PNG image