loreanvictor/callbag-expr

**callbag‑expr** is a tiny library that lets you write reactive expressions over **callbag** streams. By using a special `$` accessor inside a function, you can combine, conditionally evaluate, or passively track the latest values of callbags, producing a new callbag that re‑emits whenever any of the tracked sources change. It’s aimed at JavaScript/TypeScript developers who already use the callbag ecosystem and want a concise, RxJS‑style “autorun” syntax for building derived streams.