Comments (6)
Thank you for the comprehensive repro.
I reduced it a bit more and also added two potential workarounds that I highlighted in comments as "Alternate A" and "Alternate B" as well as one with (in my opinion) degraded UX in "Alternate C": https://stackblitz.com/edit/react-9vvm42?file=src%2FApp.js
First two clicks create just one pending update. Everything works fine.
Last click happens while the action from the prior click is still pending, creating this intermediate state where an item is both in the optimistic and non-optimistic slice.
Screencast.from.18.03.2024.11.01.08.webm
I also added a test that repros the original issue: #28575
However, I'll double check with the team if this shouldn't have "just worked" as you authored it. If either of the workarounds are required, we should definitely document it. Especially since it's not quite clear to me how this would work with primitives e.g. incrementing an optimistic click counter.
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FYI, This could be reproed in the official demo
optimistic.mov
from react.
@eps1lon Your "Alternate A" solution is pretty clear and works great.
However, I have a questions about "Alternate B" solution.
Why optimistic update function is called 3 times every time optimistic state is updated?
And how this solution work at all, I mean, how item can be inside non-optimistic state earlier optimistic version if we append it to optimistic version first? 🤔
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Why optimistic update function is called 3 times every time optimistic state is updated?
When an action completes, we rebase the optimistic updates (i.e. replay) on top of the passthrough value (the non-optimistic state). That's why you see multile calls.
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@eps1lon thank you for the explanation.
And how this solution work at all, I mean, how item can be inside non-optimistic state earlier optimistic version if we append it to optimistic version first? 🤔
Could you throw the light on the question above?
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Because we added it to the non-optimistic slice but it's still in the optimistic slice because one action is still pending.
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