"undefined is not a function"? — It is now!

uop is a tiny package that helps strict undefined checking on objects with nested properties

Access and chain object properties and methods in a safe manner.

❌ Find keys containing undefined within an object with support for deeply nested objects

Remove undefined properties from object

Test if a value is undefined or null.

Filters array entries that are null or undefined.

💊 1kb tiny convert null value from any type of value to undefined.

nuller is a simple library for providing default values for null or undefined object property access, created for/at the OSS workshop 🦁

Eslint rule to prevent undefined declaration in favor of optional chaining (?) operator in Typescript

Test if a value is a JavaScript primitive.

Test if a value is an array-like object containing only JavaScript primitives.

Schem - Multipurpose app

JavaScript Package for checking is variable empty,undefined or null

Checks if `value` is `null` or `undefined`.

Test if a value is undefined.

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

Flexible Data Validation Module with Built in default Types.

This is an alternative to the lodash's merge function, but it does overwrite values with undefined