kind-of-types
List of all javascript types. Used and useful for checking, validation, sanitizing and testing. Like isStream, isPromise, isWeakset and etc.
es6-error
Easily-extendable error for use with ES6 classes
you-are-not
Runtime type-checking written in TypeScript -- Not is a minimal, blazing fast, intuitive, API-centric, and customisable API payload sanitiser/type-checking/validation/error handing and messaging helper -- all in a small and neat pack.