Continuable is a tiny Node‑style library that treats asynchronous operations as first‑class values—functions that accept a single `(err, value)` callback. It provides combinators such as `map`, `mapAsync`, `chain`, `join`, `both`, and `either` (plus helpers like `of`, `error`, `to`, `series`, and `para`) so developers can compose, transform, and control async flows without nesting callbacks. The project is aimed at JavaScript/Node developers who want a functional, monadic style for handling callbacks.