Is-undefined Packages

Utilities to get and check variable types (isString, isPlainObject, isRegExp, etc)

This library is to check for null and undefined values in JSON objects

Check if the parameter is undefined

Type check in TypeScript

ESNext type checker.

Simple JS library that checks if value is an empty object, collection, string

Simple and light-weight JavaScript type checker that brings convenience!

A simple library to determine whether the object is null-like or not.

An Angular Library, that gives you a hussle free experience on data operation using pipes

A small JavaScript library that enhances Quality of Life by solving various problems.

Check your types at runtime with ESNext syntax by meta programing in node.js and browser with interfaces, strict object and more.