Typed‑Error is a tiny JavaScript/TypeScript library that makes it simple to create custom error classes that behave like the native `Error` but retain proper type information (name, constructor, stack) for reliable `instanceof` checks. It’s aimed at developers using Node.js (or the browser) with TypeScript, CoffeeScript, or Promise libraries such as Bluebird who need typed, catch‑able error subclasses for clearer error handling.