Add rune to more easily combine reactive values and state objects about svelte HOT 5 CLOSED

You can make a class, and utilize $state/$derived for class fields (docs)
REPL (check the compiled code and you'll see that it's very similar to what you wrote above)

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I'm aware that state and derived can be used on class fields. I suppose you could extend classes to accomplish something similar, but that doesn't permit for the kind of composability that I am looking for since you can't merge two classes, again, as far as I know.

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If I understood you correctly something similar is already discussed in #11210.

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Similar, yes. But not the same. I don't care much about writing getters and setters the one time if that's an issue, but it becomes a pain when I have to do it to combine state objects. It also makes the $inspect rune not work as well since every property shows up as getters and setters instead of the actual value.

The recommended solution here is also slightly different, as it is not used on object properties or array elements but takes in state and flattens it into an object. However, whether that is different depends on how the compiler works.

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You can use $state and create an object of properties on it, including using deriveds. You can merge these objects by writing a small utility function yourself using Object.getOwnPropertyDescriptors. Combined this removes almost all the boilerplate. Playground example. Therefore closing because this can be achieved in userland without a new rune.

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