ReactiveCocoa VS observable

ReactiveCocoa - Cocoa framework and Obj-C dynamism bindings for ReactiveSwift. Language: Swift.

> especially since Observables have been widely available and actively worked on for a long time, without seeing wide adoption

Take a look at "Userland libraries" section [0] of the proposal (almost certainly written by Ben). He argues that observables get reinvented in the userland in various libraries over and over again. It is a primitive, like a Promise, only better.

[0] - https://github.com/WICG/observable?tab=readme-ov-file#userla...

Perhaps this falls into the repetitive boilerplate category you referred to, but if you want framework-agnostic domain objects that still work well with Svelte, create your own using the observer pattern.

Create an object with a subscribe method and whatever other methods make sense for updating its state. Svelte will treat it like one of its stores, and it will work with the $ syntax. It can be used with React via its `useSyncExternalStore` hook. It can be used with SolidJS via its `from` utility.

If you don't want to handle the set-up boilerplate, you could use another library like Effector or RxJS, but of course, that means another dependency. There is a gradual move to make something like this a part of the platform[1], but who knows when or if it will land.

[1] https://github.com/domfarolino/observable