A prototype-based inheritance library that makes it easy to create objects and inheritance hierarchies without losing the power of javascript's prototype system.

An extendable Error class that actually works, with TypeScript definition files, supporting old and new style classes and compatibility even with the oldest browsers

Browser-friendly inheritance fully compatible with standard node.js inherits()

Simple library for setting up Javascript classes based on Backbone.extend

Mix-in, inheritance and constructor extend behavior for your JavaScript enjoyment.

Object-centric serialization of Concerto models

Dynamic multiple inheritance for JavaScript and TypeScript. Without mixins.

A library that provides a basic ES6 error class.

Lightweight, fast, and powerful JS template engine. Supports helpers, filters, template inheritance

Class inheritance library with support for bean-style accessors.

Class factory featuring inheritance of static properties, static constructors, lazy population of prototypes, and this._super.

A simple library for multiple inheritance in JavaScript.

Prototype fusion

JavaScript Template Engine

A complete and fast template engine fully compatible with twig and similar to jinja with zero dependencies.

Dedupe JavaScript Class Mixins

A unified interface for compiled languages and templates in JavaScript

Use the unset keyword in CSS.

Transpile an enriched GraphQL string schema (e.g. support for metadata, inheritance, generic types, ...) into the standard string schema understood by graphql.js and the Apollo server client.

Vue typescript class and decorator based component.