API reference > @kontsedal/olas-core > createQuery

createQuery() function

Subscribe this controller to a shared cache entry (§5.2).

const user = createQuery(ctx, userQuery, () => [userId.value])

Needs a query engine on the root:createRoot(def, { deps, queries: queryEngine() }).

With options.select, the subscription reports select(data). The projection runs per subscriber, and the cache keeps the raw value.

Signature:

export declare function createQuery<Args extends unknown[], T, U>(ctx: Ctx, source: Query<Args, T>, options: QuerySelectOptions<readonly [...Args], T, U>): QuerySubscription<U>;

Parameters

Parameter	Type	Description
ctx	Ctx
source	Query<Args, T>
options	QuerySelectOptions<readonly [...Args], T, U>

Returns:

QuerySubscription<U>