atom

A typed reactive container that holds a single value: call `get()` to read it, `set()` to update it and synchronously notify all subscribers, and `subscribe()` to register a listener — receiving an unsubscribe handle in return. `Atom.fn()` extends this model to plain functions, wrapping any callable so that every invocation fans out to subscribers, making it easy to build observable event emitters without a class. Zero dependencies.