Here is a codepen to cover watch cases:
https://codepen.io/tomorrowsystem/pen/BaNPpXz?editors=1001

It may need some refactoring, While it will not be easy to get rid of recursive iterations.

What do you think guys? Is this updated implementation better?
@calebporzio @HugoDF @SimoTod

I'm going to close this for now and only support shallow "watching" in Alpine V2. I believe this feature will just work out of the box with the new v3 reactivity engine.

I know this wasn't an easy implementation, so thank you for the contribution 🙏

v3 still does not support watch deep, does it? (I just came back to Alpine after last trying V2 and made a small example project. At least I couldn't get it to work and it's not mentioned in the docs either.)

@MrSnoozles haven't tried it myself but you might be able to achieve deep-watching with Alpine.effect().

How many months or years has this been? I still can't watch an object? How am I supposed to react to changes to the object? DO I need to attach a listener to literally every single item in the UI that is bound to any part of the object? Doesn't seem productive for a JS framework. Makes many, many UIs impractical if not impossible to write.

@justingolden21 You can use Alpine.effect() as mentioned in my comment above.