JSPM

Easy error subclassing and stack customization

Make your own error types!

Use the @extend at-rule and functional selectors in CSS

Easily subclass errors

Returns true if A is a subclass of B or the same class as B.

Moog provides powerful module subclassing.

tslint support for an override keyword

A production-grade error creation and serialization library designed for Typescript

View Engine for ExpressJS. Write your views using ES6 Template Strings. Simple, fast, extensible.

moog-require extends moog with support for type definitions in local files and npm modules.

Use the @extend at-rule and functional selectors in CSS

Promise subclass with mechanism to report progress before resolving

Workaround for subclassing errors. Both instanceof and stack are functional.

Jest expect matchers for subclasses

Class.js is a Javascript library designed to allow easy, non-obtrusive creation of Java-like classes without requiring a cross-compiler, and without otherwise interfering with the capabilities of Javascript.

Simple and powerful class utility to allow the easy use of OOP in JS. Includes inheritance, mixins, abstract classes, inherited statics, and more.

Easy `Function` subclasses

Detect native class support.

Detect native class support.

Async-friendly subclassing and option management

Promise subclass to make the promise chain abortable.

array-base

Use the @extend at-rule and functional selectors in CSS

Augmented Object Oriented Programming

create a bunch of custom errors

A port of PrototypeJS's class-based OOP system.

basic utility to augment a constructor

Provides a syntax for prototypal inheritance that also allows for arrays that inherit from a custom prototype

Returns true if A is a subclass of B.

Inherit, extend, decorate, and override classes and instances.

Detect native class support.

Easily subclass errors

Array info to use with augment-with functionality

Simply create subclassed Error functions