refactor: using useRef in useLocalObservable

[misaeldossantos]

Code change checklist

• [ ] Added/updated unit tests
• [ ] Updated /docs. For new functionality, at least API.md should be updated
• [ ] Verified that there is no significant performance drop (yarn mobx test:performance)

Change useState to useRef in useLocalObservable, creating a mutable reference.

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Latest commit: 2c326fa087950e099fb5d048bfbe8cc212c05f1c

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[kubk]

Hi, could you describe the necessity of that change?

[misaeldossantos]

i think useRef is more appropriate, because the mobx observable object is a mutable reference

[kubk]

I'd say that both useState and useRef are appropriate here because they remember their data after re-renders. The approach with useRef is just more verbose (hence more bytes in the bundle). Thank you for the desire to improve things, but I think this change is not necessary.