Type-checking Packages

2 functions that check if passed argument is or is not a finite number

Tiny tiny duck typing utility

a function to be called inside a loop that iterates through an array of numbers

Function triggers error if argument is not array

Type-check your function inputs with syntax like T(s, T.string, buf, Buffer, strings, T.list(T.string))

Runtime type annotations for CoffeeScript (and JavaScript too!)

A featureful function parameters signature module

Triggers error if argument is not integer of type 'number'

Function triggers error if argument is not finite number of type 'number'

Function triggers error if argument is not integer of zero or greater

Runtime type checking for css props.

A small library for checking types

Babel plugin for static and runtime type checking using Flow and tcomb

Type creation, validation, and comparison for Javascript

Guard is a type checker that aims to make type checking function arguments easier and more readable.

A little library for asserting types and values, with zero dependencies. Follower for check-types (archived).

Type creation, validation, and comparison for Javascript

Easy but powerful enums for safer code. e.g. const Fruit = new Enum("apple pear banana"); gives you Fruit.apple, Fruit.has("apple"), and Fruit.$apple() (as a fail-fast value), whilst Fruit.isApple('penguin') will throw an error.

Turn any JavaScript data structure into its typed representation.

Babel macro that automatically generates type guards for a given type (WIP)