Function prependToInfiniteChatsCache

site/src/api/queries/chats.ts:115–135

(
	queryClient: QueryClient,
	chat: TypesGen.Chat,
)

 * runs independently on each page.
 */
export const prependToInfiniteChatsCache = (
	queryClient: QueryClient,
	chat: TypesGen.Chat,
) => {
	queryClient.setQueriesData<InfiniteChatsCacheData>(
		{ queryKey: chatsKey, predicate: isChatListQuery },
		(prev) => {
			if (!prev?.pages) return prev;
			// Check across ALL pages to avoid duplicates.
			const exists = prev.pages.some((page) =>
				page.some((c) => c.id === chat.id),
			);
			if (exists) return prev;
			// Only prepend to the first page.
			const nextPages = prev.pages.map((page, i) =>
				i === 0 ? [chat, ...page] : page,
			);
			return { ...prev, pages: nextPages };
		},
	);
};

/**
 * Reads the flat list of chats from the first matching infinite query