Undefined Packages

All annexe nowt utility functions under namespace "nowt".

A utility function to validate if a value is null or undefined

A utility function to validate if a value is undefined

to check null or empty

Typesafe converter from any value type into number. You can also specified the fallback if the result is NaN.

Convert object that contain undefined to null and convert object that contain null to undefined

Some standard guards and exceptions

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

Utilities that pair well with the lovely nullish coalescing (??) operator

A small safe accessor that uses reduce to prevent 'Cannot read property of undefined' errors

Type safe variable checks

✅ Type validation for ES6+ and Typescript projects

Classes for implementing different types of errors in the application.

Create response object instead of error throwing.

Used to check if some of the arguments are null or undefined.

A Typescript assertion that only throws on null and undefined

Simple method for defining a default value when a value is undefined

Safe Window Getters

coffeelint plugin that handles variables and their scope

Сервис определения пустых значений для JavaScript