In this article, we review TanStack DB and how useLiveQuery is imlemented in claude-code-ui. We will look at:
What is TanStack DB?
useLiveQuery in claude-code-ui.
What is TanStack DB?
TanStack DB gives you a reactive, client-first store for your API data with collections, live queries and optimistic mutations that keep your UI reactive, consistent and blazing fast 🔥
At the time of writing this article, TanStack DB has 3.5k stars on GitHub.
How it works?
TanStack DB works by:
defining collections typed sets of objects that can be populated with data
using live queries to query data from/across collections
making optimistic mutations using transactional mutators
// Define collections to load data into
const todoCollection = createCollection({
// ...your config
onUpdate: updateMutationFn,
})
const Todos = () => {
// Bind data using live queries
const { data: todos } = useLiveQuery((q) =>
q.from({ todo: todoCollection }).where(({ todo }) => todo.completed)
)
const complete = (todo) => {
// Instantly applies optimistic state
todoCollection.update(todo.id, (draft) => {
draft.completed = true
})
}
return (
<ul>
{todos.map((todo) => (
<li key={todo.id} onClick={() => complete(todo)}>
{todo.text}
</li>
))}
</ul>
)
}
Learn more about TanStack DB in the Getting Started guide.
useLiveQuery in claude-code-ui.
I came across the term useLiveQuery in claude-code-ui’s CLAUDE.md.
So where do I find this useLiveQuery? I first thought it would be in the data folder, but useLiveQuery is called in useSessions.ts file.
/**
* Hook to get all sessions from the StreamDB.
* Returns reactive data that updates when sessions change.
*
* NOTE: This must only be called after the root loader has run,
* which initializes the db via getSessionsDb().
*/
export function useSessions() {
const db = getSessionsDbSync();
const query = useLiveQuery(
(q) =>
q
.from({ sessions: db.collections.sessions })
.orderBy(({ sessions }) => sessions.lastActivityAt, "desc"),
[db]
);
// Transform to array of sessions
// The query.data is a Map where values are the session objects directly
const sessions: Session[] = query?.data
? Array.from(query.data.values())
: [];
return {
sessions,
isLoading: query?.isLoading ?? false,
};
}
The comment above ths hook explains what it does.
About me:
Hey, my name is Ramu Narasinga. I study codebase architecture in large open-source projects.
Email: ramu.narasinga@gmail.com
I spent 200+ hours analyzing Supabase, shadcn/ui, LobeChat. Found the patterns that separate AI slop from production code. Stop refactoring AI slop. Start with proven patterns. Check out production-grade projects at thinkthroo.com
Top comments (0)