[pull] canary from vercel:canary - #1319
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## What? Updates the Interactive Apps guide to show how an optimistic mutation handles an expected server error. ## Why? The optimistic card move automatically returns to the confirmed data when the write fails, but the guide did not show how to explain that failure to the user. A success toast would duplicate the visible card movement, so the example only adds feedback for the error case. ## How? - Return a structured error result when the task no longer exists. - Display that expected error in a toast while `useOptimistic` reverts the card. - Forward unexpected thrown errors to the nearest error boundary.
Store/load the encryption keys at `.next/server/preview-props.json` (which are always needed) as opposed to including the giant `.next/prerender-manifest.json` The manifest is added to `required-server-file.json#files` so it keeps getting included in prod `.next/prerender-manifest.json` is unchanged for backwards compatiblity reasons This is work towards the goal of not including the one giant prerender-manifest at runtime in the serverless function
…97551) ### Why? generateMetadata can be marked with use cache, but Cache Function return values must be serializable. The metadataBase examples use URL objects, so the interaction needs co-located guidance for cached metadata. ### How? Add a Good to know note that recommends returning metadataBase as a string, such as with url.toString(), and links to the use cache serialization requirements. Runtime behavior is unchanged. <!-- NEXT_JS_LLM --> --------- Co-authored-by: Joseph <joseph.chamochumbi@vercel.com>
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