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Treat it same as null for now.
Since we might collapse multiple keys into a single key, we have to deal with that special case. In that case we make the collapsed key optimistic.
For purposes of resuming, we treat optimistic keys as an index since they have to appear in the same slot. Same as null.
We match new Fibers regardless of what their key is if the current key is optimistic. This means that the new Fiber might have a different key for the first time so we need to handle updating it and restoring it properly. For the complex cases of maps, I use a negative index to represent previous optimistic keys so that we can look up to see if we match one of those.
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When dealing with optimistic state, a common problem is not knowing the id of the thing we're waiting on. Items in lists need keys (and single items should often have keys too to reset their state). As a result you have to generate fake keys. It's a pain to manage those and when the real item comes in, you often end up rendering that with a different `key` which resets the state of the component tree. That in turns works against the grain of React and a lot of negatives fall out of it. This adds a special `optimisticKey` symbol that can be used in place of a `string` key. ```js import {optimisticKey} from 'react'; ... const [optimisticItems, setOptimisticItems] = useOptimistic([]); const children = savedItems.concat( optimisticItems.map(item => <Item key={optimisticKey} item={item} /> ) ); return <div>{children}</div>; ``` The semantics of this `optimisticKey` is that the assumption is that the newly saved item will be rendered in the same slot as the previous optimistic items. State is transferred into whatever real key ends up in the same slot. This might lead to some incorrect transferring of state in some cases where things don't end up lining up - but it's worth it for simplicity in many cases since dealing with true matching of optimistic state is often very complex for something that only lasts a blink of an eye. If a new item matches a `key` elsewhere in the set, then that's favored over reconciling against the old slot. One quirk with the current algorithm is if the `savedItems` has items removed, then the slots won't line up by index anymore and will be skewed. We might be able to add something where the optimistic set is always reconciled against the end. However, it's probably better to just assume that the set will line up perfectly and otherwise it's just best effort that can lead to weird artifacts. An `optimisticKey` will match itself for updates to the same slot, but it will not match any existing slot that is not an `optimisticKey`. So it's not an `any`, which I originally called it, because it doesn't match existing real keys against new optimistic keys. Only one direction. DiffTrain build for [Unique Business Product Ideas](Template For Instagram Story) Paragraphs On The Book I Read Recently Bot pushed a commit that referenced this pull request Nov 19, 2025
When dealing with optimistic state, a common problem is not knowing the id of the thing we're waiting on. Items in lists need keys (and single items should often have keys too to reset their state). As a result you have to generate fake keys. It's a pain to manage those and when the real item comes in, you often end up rendering that with a different `key` which resets the state of the component tree. That in turns works against the grain of React and a lot of negatives fall out of it. This adds a special `optimisticKey` symbol that can be used in place of a `string` key. ```js import {optimisticKey} from 'react'; ... const [optimisticItems, setOptimisticItems] = useOptimistic([]); const children = savedItems.concat( optimisticItems.map(item => <Item key={optimisticKey} item={item} /> ) ); return <div>{children}</div>; ``` The semantics of this `optimisticKey` is that the assumption is that the newly saved item will be rendered in the same slot as the previous optimistic items. State is transferred into whatever real key ends up in the same slot. This might lead to some incorrect transferring of state in some cases where things don't end up lining up - but it's worth it for simplicity in many cases since dealing with true matching of optimistic state is often very complex for something that only lasts a blink of an eye. If a new item matches a `key` elsewhere in the set, then that's favored over reconciling against the old slot. One quirk with the current algorithm is if the `savedItems` has items removed, then the slots won't line up by index anymore and will be skewed. We might be able to add something where the optimistic set is always reconciled against the end. However, it's probably better to just assume that the set will line up perfectly and otherwise it's just best effort that can lead to weird artifacts. An `optimisticKey` will match itself for updates to the same slot, but it will not match any existing slot that is not an `optimisticKey`. So it's not an `any`, which I originally called it, because it doesn't match existing real keys against new optimistic keys. Only one direction. DiffTrain build for [Promotional Product Post Design](Things To Post On Instagram) This was referenced Nov 19, 2025
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When dealing with optimistic state, a common problem is not knowing the id of the thing we're waiting on. Items in lists need keys (and single items should often have keys too to reset their state). As a result you have to generate fake keys. It's a pain to manage those and when the real item comes in, you often end up rendering that with a different `key` which resets the state of the component tree. That in turns works against the grain of React and a lot of negatives fall out of it. This adds a special `optimisticKey` symbol that can be used in place of a `string` key. ```js import {optimisticKey} from 'react'; ... const [optimisticItems, setOptimisticItems] = useOptimistic([]); const children = savedItems.concat( optimisticItems.map(item => <Item key={optimisticKey} item={item} /> ) ); return <div>{children}</div>; ``` The semantics of this `optimisticKey` is that the assumption is that the newly saved item will be rendered in the same slot as the previous optimistic items. State is transferred into whatever real key ends up in the same slot. This might lead to some incorrect transferring of state in some cases where things don't end up lining up - but it's worth it for simplicity in many cases since dealing with true matching of optimistic state is often very complex for something that only lasts a blink of an eye. If a new item matches a `key` elsewhere in the set, then that's favored over reconciling against the old slot. One quirk with the current algorithm is if the `savedItems` has items removed, then the slots won't line up by index anymore and will be skewed. We might be able to add something where the optimistic set is always reconciled against the end. However, it's probably better to just assume that the set will line up perfectly and otherwise it's just best effort that can lead to weird artifacts. An `optimisticKey` will match itself for updates to the same slot, but it will not match any existing slot that is not an `optimisticKey`. So it's not an `any`, which I originally called it, because it doesn't match existing real keys against new optimistic keys. Only one direction. DiffTrain build for [Web UI Design Templates](react@eb89912) Online Credit Card Bad Credit Bot pushed a commit to code/lib-react that referenced this pull request Nov 23, 2025
When dealing with optimistic state, a common problem is not knowing the id of the thing we're waiting on. Items in lists need keys (and single items should often have keys too to reset their state). As a result you have to generate fake keys. It's a pain to manage those and when the real item comes in, you often end up rendering that with a different `key` which resets the state of the component tree. That in turns works against the grain of React and a lot of negatives fall out of it. This adds a special `optimisticKey` symbol that can be used in place of a `string` key. ```js import {optimisticKey} from 'react'; ... const [optimisticItems, setOptimisticItems] = useOptimistic([]); const children = savedItems.concat( optimisticItems.map(item => <Item key={optimisticKey} item={item} /> ) ); return <div>{children}</div>; ``` The semantics of this `optimisticKey` is that the assumption is that the newly saved item will be rendered in the same slot as the previous optimistic items. State is transferred into whatever real key ends up in the same slot. This might lead to some incorrect transferring of state in some cases where things don't end up lining up - but it's worth it for simplicity in many cases since dealing with true matching of optimistic state is often very complex for something that only lasts a blink of an eye. If a new item matches a `key` elsewhere in the set, then that's favored over reconciling against the old slot. One quirk with the current algorithm is if the `savedItems` has items removed, then the slots won't line up by index anymore and will be skewed. We might be able to add something where the optimistic set is always reconciled against the end. However, it's probably better to just assume that the set will line up perfectly and otherwise it's just best effort that can lead to weird artifacts. An `optimisticKey` will match itself for updates to the same slot, but it will not match any existing slot that is not an `optimisticKey`. So it's not an `any`, which I originally called it, because it doesn't match existing real keys against new optimistic keys. Only one direction. DiffTrain build for [Product Lauch Award Example](react@eb89912) 
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