node‑klass is a lightweight, ES5‑style class library for JavaScript/Node that adds pseudo‑classical inheritance, mixins, automatic namespace autoloading, singleton support, and a suite of utility helpers (binding, type checking, printf‑style formatting, etc.). It’s aimed at developers who want an ExtJS‑like class system—with scopes, statics, and rich meta‑programming features—in Node.js or browser environments, enabling faster, more organized development of modular codebases.