Signals 2.0: The Future of Signals

A live stream walkthrough of SolidJS 2.0's experimental signals system, focusing on async reactivity via a new `createAsync` primitive. Key topics include: how async signals never return undefined (they throw at read time, not fetch time), enabling parallel and nested data fetching without waterfalls, how suspense and error boundaries work at the reactive level rather than the component level, and a breaking change to `createEffect` that splits tracking from side-effect execution to ensure predictable async behavior. The stream also previews mutable derived stores and discusses the fundamental tradeoffs of bail/stay-in-past/tear when handling async state updates.